ME 603 Refresher
1. When working on bearings and checking for high spots, it is customary to apply:
A. white lead
C. dykem blue
B. red lead
D. Prussian blue *
2. If you wanted to check the face of a pump slide valve or other flat-faced valve, you could
check for trueness on a:
A. flat board
C. piece of glass
B. surface plate *
D. bearing plate
3. Before splicing electric wires, they should be:
A. tinned
C. soldered
B. cleaned and tinned *
D. insulated
4. Which of the following is not a standard thread form?
A. Square
C. Double flute *
B. American National
D. 60 deg. sharp V
5. Hand taps are provided in sets of three called:
A. taper, plug and end
C. taper, plug and bottom *
B. short, taper and bottom
D. short, medium and long
6. When preparing to tap a hole, the size of the drill will be
A. equal to the size of the tap
B. larger than the size of the tap
B. smaller than the size of the tap *
D. none of the above
7. When preparing to tap a hole for a pipe fitting the size of the drill will be :
A. larger than the tap size *
B. smaller than the tap size
C. equal to the size of the tap
D. none of the above
8. Which of the following does not have to be lubricated when drilling?
A. steel
C. monel
B. brass *
D. tool steel
9. The tool to use when cutting a hole in the side of a round piece of metal is called a:
A. vise
C. “V” block *
B. jaw holder
D. chuck
10. A pair of equal and opposite (not collinear) forces that tend cause a rotation of a body
A. couple *
C. equilibrium
B. centroids
D. vector
11. The ratio of the pitch diameter in inches to the number of teeth
A. pitch circle
B. English module *
C. module
D. pitch diameter
12. When high strength and durability are a requirements for choosing gear materials it is
preferable to use_________material
A. hardened bronze
C. phenolic laminated
B. steel *
D. white iron
13. The distance between similar, equally-spaced tooth surfaces in a given direction and along a
given line.
A. pitch circle
C. pitch *
B. pitch plane
D. pitch diameter
14. The use of hardened steel for the mating metal gear appears to give the best results and longer
operational life. The usual hardness is in the range ofA. over 600 BHN *
C. below 350 BHN
B. 300 to 400 BHN
D. over 400 BHN
15. Continuous stretching under load even if the stress is less than the yield point
A. plasticity
C. creep *
B. elasticity
D. ductility
16. The most known lubricants being utilized in whatever category of load and speed are oil, air,
grease and dry lubricants like
A. bronze
C. silicon
B. lead
D. graphite *
17. A coupling that allows axial flexibility/movement in the operation. Made of alternate bolting
of steel, leather, fabric and/or plastic material into the two flanges
A. Flexible disk coupling *
B. flexing Oldham coupling
C. Flexible toroidal spring coupling
D. Elastic-material bonded coupling
18. It consists of two cranks, a stationary piece called the line of centers and the connecting rod
is a
A. five-bar linkage
C. three-crank linkage
B. four-crank braces
D. four-bar linkage *
19. Balancing of grinding wheel is done to
A. make the outside diameter concentric with the bore.
B. make the sides of wheel parallel.
C. equalize the weight in every portion of the wheel. *
D. None of the above.
20. Taps are resharpened by grindings
A. Flutes *
C. Threads
B. Diameter
D. Relief
21. The purpose of______is to prevent gears from jamming together and making contact on both
sides of their teeth simultaneously
A. tooth fillet
C. backlash *
B. stress relieving
D. all of these
22. Choose the economical type of material for gears that give/sustain good operating quality/life
for intended operation
A. plane carbon steel C. all of these
B. high alloy steel
D. heat treated carbon steel *
23. Allowance added in the casting pattern to compensate for the contraction of metal
A. tapering allowance
C. finish allowance
B. shrinkage allowance *
D. draft pattern
24. Ratio of the angle of action to the pitch angle
A. contact ratio *
C. ratio of gearing
B. approach ratio
D. module
25. The principle materials used in the production of metal working tools:
A. high carbon steel *
B. titanium, phosphorous
C. tungsten, silicon, hadfield Mn
D. vanadium, chromium, molybdenum
26. Also called eccentrically loaded bearing is ________.
A. full bearings
C. partial bearing
B. offset bearing *
D. fitted bearings
27. In the selection of wire rope, regular lay means wires and strands are arranged in the following
manner:
A. twisted in the same direction
B. twisted in opposite direction*
C. twisted in any direction
D. twisted in along direction
28. In involute teeth, the pressure angle is often defined as the angle between the line of action
and the line of tangent to the pitch circle. It is also termed asA. helix angle
C. Angle of obliquity *
B. angle of recess
D. Arc of action
29. Height of tooth above pitch circle or the radial distance between pitch circle and top land of
the tooth.
A. top root
C. land
B. addendum *
D. hunting tooth
30. The function of clutch in the machine tool is?
A. lowering of drive speed
B. to disconnect or connect at will the drive *
C. alignment of drive shaft
D. to insure that two shaft line up at high speed
1. What type of gears that can transmit power at an angle?
A. Worm gear
B. helical gear
C. Bevel gear *
D. herringbone gears
2. Module can be expressed in?
A. dimensionless
B. mm/ no. of teeth *
C. mm
D. none of the above
3. A reverted gear train is one in which:
A. The direction of rotation of the first and last gear is the same
B. The direction of rotation of the first and last gear is opposite
C. The first and last gear are essentially on separate shaft
D. The first and last gear are on the same shaft*
4. The number of links in a pantograph is equal to;
A. 3
B. 4 *
C. 5
C.1
5. A shaft revolving in a bearing forms a:
A. Sliding pair*
6.
B. higher pair
C. turning pair
D. lower pair
In case of cross helical worm the axes of the two shafts are:
A. Non-parallel-intersecting*
B. parallel
C. intersecting
D. non-parallel
7. Slip in belt drive is:
A. Loss of power
B. difference between the velocities of two pulleys
C. difference between the linear speed of the rim of pulley and the belt on it
D. difference between the angular velocities of two pulley*
8. Recommended best cutting angle of drill for work on steel or cast iron is ________
degrees.
A. 63
B. 59 *
C. 50
D. 49
9. Nominal stress relieving temperature for cast steel
A. 200 TO 350OF
B. 300 TO 500OF
C. 450 TO 550OF *
D. 400 TO 600OF
10. 244. For a high corrosion resistant stainless steel, what minimum chromium content is
required?
A. 4.5%
B. 1.2%
C. 5.8%
D. 8%*
11. Commonly used in parallel shaft transmission especially when a smooth continuous
action is essential as in high speed drives up to 12,000 fpm.
A. herringbone gear *
B. helical gear
C. spur gear
D. bevel gear
12. A babbit is :
A. antimony bearing lead or tin alloy*
B. measure of magnetic induction
produced
C. an eutectic of iron and iron phosphide
D. a gadget for measuring volume
13. A device for converting rotary motion to reciprocating motion is:
A. cam*
B. gear
C. pulley
D. Helical gear
14. Device used to measure speed accurately:
A. Dial gage
B. speedometer
C. dial indicator
D. tachometer*
15. When two elastic bodies collide, which of the following laws can be used to solve for
the resulting velocity?
A. Conservation of energy B. Conservation of momentum and conservation of
energy*
C. Avogadro
D. Dalton’s law
16. It is the science of motion that can be solved in terms of scalar or vector algebra
A. curvilinear translation
B. projectiles
C. acceleration
D. kinematics*
17. Outstanding safety record contributes to:
A. Pride and enthusiasm to one’s self*
B. Outstanding performance that experts reward from management
C. High productivity and quality of work
D. Confidence in foreman’s ability to perform well
18. A type of coupling that allows a light amount of torsional / angular flexibility due to
introduction with some elastic material cylindrically wrapped around the bolts in the
flange.
A. Elastic-material bushed coupling
B. All of these*
C. Elastic-material bonded coupling
D. Simple elastic bonded coupling
19. In a uniformly loaded single beam, the maximum vertical shearing force occurs:
A. at the center
B. at either end support*
C. at the section of maximum moment
D. at beam bottom fiber
20. A material that should be avoided in constructing wood pattern
A. sap wood*
B. core portion of wood
C. heart wood
D. kiln dried wood
21. Copper and most of its alloys can be hardened by:
A. cold working
B. case hardening*
C. soaking
D. patenting
22. The center of gravity of a solid pyramid or cone with a total height of H is:
A. 1/4H*
B. 1/3H
C. 1/5H
D. 3/5H
23. It is recommended for high speed application that the maximum number of teeth in
small sprocket should be
A. 18-24 *
B. 26-40
C. 12-16
D. 26-28
24. It is recommended not to have a direct drive and the drive sprockets if the ratio of their
teeth exceeds _________, use two or more step combination.
A. 5 times
B. 10 times
C. 8 times *
D. 9 times
25. Gear used to transmit power at high velocity ratios between non-intersecting shafts that
are usually but not necessarily at right angle.
A. Spiral gear
B. Bevel gear
C. Helical gear
D. Worm gear*
26. Which of the following does not belong to the group?
A. Hardening*
B. Soldering
C. TIG
D. MIG
27. A kind of chuck which has reversible jaws which could be adjusted properly
A. Chuck Connors
B. Universal Chuck
C. Live Chuck
D. Independent Chuck*
28. When machining nickel alloys, the best type of cutting fluid is:
A. sulfurized oil *
B. Straight mineral oil
C. Soluble oil
D. mixture of mineral and fatty oil
29. The cold working of mild steel makes the metal:
A. Tougher
B. more malleable
C. harder*
D. more ductile
30. In kinematics, the number of degrees-of-freedom of a linkage may also be called:
A. Joint’s Freedom
B. Parameters
C. Mobility*
D. Cycle
31. A block weighing 56 lbs rest on horizontal surface. The force needed to move along the
surface is 20 lbs. determine the coefficient of friction.
A. 0.431
B. 0.112
C. 0.36*
D. 0.28
32. A 114 km/s speed is projected vertically how long will it take to go back to its initial
position.
A. 6.45 hrs *
B. 1.23 hrs
C. 7.23 hrs
D. 8.451 hrs
33. In an Oxy-Acetylene manual welding method, to weld a 3 ½ ft long seam in a 0.375”
thick steel plate at a consumption rate of 9 ft3/ft for oxygen and 7 ft3/ft for acetylene.
Compute for the total combined gas consumption in ft3.
A. 188
B. 500
C. 99*
D. 50
34. Two cylinders rolling in opposite direction has a speed ratio of 3. If the center distance
is 40 in, find the diameter of smaller cylinder.
A. 20 in*
B. 70 in
C. 50 in
D. 30 in
35. Three cylinders A:B:C rolling in external contact has a speed ratio of 4:2:1. If the
diameter of cylinder A is 10 cm, find the center distance between cylinder A and C.
A. 40 cm
B. 35 cm
C. 45 cm*
D. 60 cm
36. How many 5/16 inch holes can be punched in one motion in a steel plate made of SAE
1010 steel, 7/16 inch thick using a force of 55 tons. The ultimate strength for shear is 50
ksi and use 2 factor of safety.
A. 5.81
B. 3.7
C. 5.0*
D.6.2
37. The shaft whose torque varies from 2000 to 6000 in-lbs has 1 ½ inches in diameter and
60,000 psi yield strength. Compute for the shaft mean average stress.
A. 6036 psi*
B. 6820 psi
C. 5162 psi
D. 5560 psi
38. A journal bearing with diameter of 76.2 mm is subjected to a load of 4900 N while
rotating at 200 rpm. If its coefficient of friction is 0.02 and L/D = 2.5, find its projected
area in mm2.
A. 12090
B. 13150
C. 14166
D. 14516
39. A steel tie rod on bridge must be made withstand a pull of 5000 lbs. Find the diameter of
the rod assuming a factor of safety of 5 and ultimate stress of 64,000 psi.
A. 0.74
B. 0.85
C. 0.71*
D. 0.76
40. A 3 in diameter short shaft carrying pulleys close to the bearings transmit how much
horsepower if the shaft makes 280 rpm?
A. 992 hp
B. 918 hp
C. 199 hp*
D. 260 hp
41. The shaft is subjected to a steady load of 36,000 lbs at a shear stress of 10,000 psi.
Compute the diameter of the said shaft in inches.
A. 1 7/8
B. 3 1/4
C. 3*
D. 2 3/5
42. Compute the nominal shear stress at the surface in Mpa for a 40 mm diameter shaft that
transmit 750 Kw at 1500 rpm. Axial and bending loads are assumed negligible. Torsional
shearing stress is 28 N/mm2.
A. 318
B. 332
C. 323
D. 380*
43. Design the size of solid steel shaft to be used for a 500 Hp, 250 rpm application if the
allowable torsional deflection is 10 and the allowable stress is 10,000 psi and modulus
of rigidity is 13 x 106 psi.
A. 5-1/4” dia.
B. 4-7/8” dia.*
C. 4-5/9” dia.
D. 4-3/9” dia.
44. A 76.2 mm in diameter shafting of SAE 1040 grade, cold rolled, having a yield point of
50 ksi and with a ¾ x 5 inches key. Compute the minimum yield point in the key in
order to transmit the torque of the shaft. The factor of safety to use is 2 and Sys = 0.50
Sy.
A. 39.120 ksi
B. 42.131 ksi
C. 279.30 ksi
D. 47.120 ksi*
45. A one meter pulley is fastened to a 100 mm shaft by means of 25 mm square key and
150 mm long. What force tangent to pulley rim will shear the key if shear stress is 200
Mpa?
A. 65 KN
B. 70 KN
C. 75 KN*
D. 85 KN
46. A flanged bolt coupling has ten (10) steel 25.4 mm diameter bolts evenly tighten around
a 415 mm bolt circle. Determine the torque capacity of the connection if the allowable
shearing stress in the bolt is 50 MN/m2.
A. 59.95 KN.m
B. 52.6 KN.m*
C. 46.15 KN.m
D. 44.8 KN.m
47. A round vertical steel tank has inside diameter of 3 m and 6 m height. It contains
gasoline with a density of 750 Kg/m3. If the allowable tensile stress is 25 Mpa, find the
minimum thickness required.
A. 2.64 mm*
B. 2.85 mm
C. 3.75 mm
D. 1.82 mm
48. A cylinder having an internal diameter of 16 in and external diameter of 26 inches is
subjected to 1500 psi external pressure and internal pressure of 9,000 psi. Determine the
hoop stress on outer surface of cylinder.
A. 8,742.66 psi
B. 7,642.85 psi*
C. 9,400.62 psi
D. 9,471.42 psi
49. A cylindrical tank has a mean diameter of 40 cm and thickness of 10 cm. It is subjected
to an external pressure of 140 kg/cm2. Determine the maximum internal tangential stress
is 900 kg/cm2. Determine the maximum internal pressure of the tank.
A. 2947.5 kg/cm2*
B. 3426.5 kg/cm2
C. 1246.5 kg/cm2
D. 1942.6 kg/cm2
1. The cylinder head seal that is widely used on automobile engines is a
A.
B.
C.
D.
Composite metal gasket*
Mechanical seal
Rotary lip seal
Packed glaned
2. Rotary lip seals are used
A. Between pipe flanges
B. Around pistons
C. Around rotating shafts*
D. Around reciprocating shafts
3. The type of bearing best able to carry axial thrust is the
A. Plane journal bearing
B. Needle bearing
C. Caged ball bearing
D. Tapered roller bearing*
4. Which of the following is recovered by a simple process of heating highly crushed ore?
5.
6.
7.
8.
9.
10.
11.
12.
A. Molten copper
B. Crushed copper
C. Native copper*
D. Pure copper
A tire tread usually contains how many percent sulfur?
A. 3 to 4 %*
B. 10 to 20 %
C. No sulfur content
D. 1 to 2 %
Which of the following is a nickel alloy with 40 to 60 percent copper?
A. Constantan*
B. Alnico
C. Hastelloy
D. Inconel-x
What alloy with 15% chromium, 7% Iron, 2.5% Titanium?
A. Inconel
B. Alnico
C. K-monel
D. Inconel-x*
Which of the following welds with triangular cross section is used to join two surfaces at right
angles to each other?
A. Seam weld
B. Plug weld
C. Tack weld
D. Fillet weld*
When using the circular magnetic particle method to nondestructively test of weldment, the best
results are obtained when the
A. Current flowing at right angles to the discontinuity
B. Magnetic field is parallel to the discontinuity
C. Magnetic field is at right angles to the discontinuity*
D. Defect is located outside the parallel flux path of the rods
In this process the heat of fusion is generated by an electric arc stuck between two electrodes,
one of which is the workpiece and the other a welding rod
A. Arc welding*
B. Arc bonding
C. Metal cathode
D. Metal diode
A neutral defect of ionic lattices consisting of two vacancies (one cation and one anion).
A. Frenkel defect
B. Schottky defect*
C. Vacancy
D. Substitutional atom
In materials, what is the incomplete plane of atoms within the lattice?
A. Edge dislocation*
13.
14.
15.
16.
17.
18.
19.
20.
B. Lattice dislocation
C. Screw dislocation
D. Hybrid dislocation
What weld which joins two plates end to end to form a continuous plate?
A. Cross weld
B. Butt weld*
C. Acetylene weld
D. Fillet weld
In kinematics, the number of degrees-of-freedom of a linkage may also be called:
A. Joint’s Freedom
B. Parameters
C. Mobility*
D. Cycle
Which of the following does not belong to the group of four-bar linkages?
A. Crank Rocker Mechanism
B. Double-Rocker Mechanism
C. Drag Link Mechanism
D. Non-Grashof Mechanism*
Which of the following does not satisfy the Grashof criterion?
A. Double rocker mechanism of second kind
B. Triple-rocker mechanism
C. No link can rotate through 360 degrees
D. All of these*
Which of the following is the other name of coupler-driven linkages?
A. Polycentric*
B. Triple-rocker linkage
C. Eccentric
D. Crank-Rocker mechanism
In four bar linkages, the angle between the coupler centerline and the driven crank linkages is
called:
A. Transmission angle*
B. Binding angle
C. Optimum angle
D. Crank angle
What do you call the configuration of the linkage at the instant the follower changes direction?
A. Limiting position*
B. Minimum position
C. Balance position
D. Through position
Which of the following is probably the most common of all mechanism due to its simplicity and
versatility?
A. In-line slider crank*
B. Four bar linkages
C. Grashof mechanism
21.
22.
23.
24.
25.
D. Rotating mechanism
A mechanism that provides intermittent motion of the driven link while the driver rotates
continuously.
A. Geneva mechanism*
B. Drag-link mechanism
C. Pure kinematic pairs
D. Spatial linkages
Gears used to distribute power in automobiles but may also be used to add or subtract inputs for
control of certain processes.
A. Gear trains
B. Differential gears*
C. Worm gears
D. Zerol gears
The helix angle for most helical gears varies which of the following?
A. Between 15 to 30 deg.*
B. Between 30 to 60 deg.
C. Always 45 deg. When herringbone
D. Between 10 to 20 deg.
Resilience (elastic toughness) is a measure of
A. Energy per unit volume stored in a deformed material
B. Total plastic strain at failure
C. Strain energy per unit volume to reach the yield point*
D. Strain energy (work per unit volume) to cause fracture.
What is the hardest form of steel?
A. Bainite
B. Ferrite
C. Pearlite
26. The division between cast iron and steel in iron-carbon allots is approximately what percentage
of carbon?
A. 0.1%
B. 0.7%
C. 2.0%*
D. 4.4%
27. The temperature below which a steel alloy becomes magnetic is called the
A. Triple point
B. Curie point*
C. Freezing point
D. The lower critical point
28. The purpose of quenching steel is to
A. Relieve stress
B. Control hardness and ductility of a heated material*
C. Increase grain size
D. Increase strength and lower ductility
29. All of the following are common constituents of concrete except
A. Portland cement
B. Sand
C. Aggregates
D. Calcium chloride*
30. Surface hardening to produce a hard outer surface with a ductile interior is desirable for metal
(steel) products subjected to
A. High tensile loads
B. Shock
C. Fatigue*
D. High compressive loads
If 1080 steel (0.80 wt.% C) is annealed by very low cooling from 1000 deg C (1832 deg F) to
ambient temperature, its microstoture will consist solely of:
A. pearlite
*
C. cementite
B. bainite
D. martensite
2. Which of the following would not likely require a steel containing 0.6% carbon that has been
spheroidized, cold drawn, and slightly tempered?
A. a bridge beam
B. a water pipe
C. a cutting tool
D. a ball bearing*
3. Which of the following metals melts slowly and becomes dull red before melting?
A. Manganese Steel
B. Stainless Steel
C. Cast iron
D. Wrought iron*
4. Which area of the machine shop is where metal is being melted to form them into new shape?
A. welding area
B. mass production area
C. tool and die area
D. Foundry area*
5. What does Charpy impact test measure?
I.
the energy required to break the test sample
II.
the strength of a sample
III.
the ductile and brittle transition point of metals.
A. I and III * B. II only
C. III only
D. I only
6. Under very slow deformation and at high temperature, it is possible to have some
plastic flow in a crystal at a shear stress lower than the critical shear stress. What is the
phenomenon called?
A. slip
B. twining*
C. creep
D. bending
7. Which of the following is true regarding the ductile to brittle transition temperature?
I.
it is important for structures used in cold environment.
II.
It is the point at which the size of the shear lip or tearing rim goes to zero
III.
It is the temperature at which 20 joules of energy causes failure in a Chappy V
notch specimen of standard dimensions.
A. I and III*
B. I only
C. II and III
D. I and II
8. Which of the following correctly describes atoms located at grain boundaries?
A. They are subjected to the same type of inter-atomic forces that are present in the interior
atoms of the crystals.
B. They are located primarily in highly strained and distorted positions.
C. They have a higher free energy than atoms in the undisturbed part of the crystal lattice.
D. All of them are correct.*
9. Which of the following statements is false?
A. Hot working causes much strain hardening of the metal.*
B. Hot working increases the density of the metal.
C. One of the primary goals of hot working is to produced fine grained material.
D. In hot working, no noticeable changes in mechanical properties occur.
10. Which of the statements describe the glass transition temperature?
I.
it is the temperature at which the rate of volume contraction increases abruptly.
II.
It is the temperature at which residual stresses in the glass can be relieved.
III.
It is the point where the material behaves more like a solid than a viscous liquid.
A. I and III*
B. I and II
C. II & III
D. I & II
11. “Modulus of Resilience” is …
A. the same as the modulus of elasticity.
B. A measure of the materials ability to store strain energy.*
C. The reciprocal of the modulus of elasticity.
D. A measure of the deflection of a member.
12. Imperfections within metallic crystal structures may be all of the following,
EXCEPT:
A. lattice vacancies, or extra intertitial atoms.
B. Ion pairs missing in tonic crystals (Shotky imperfections)*
C. Displacement of atoms of interstitial sites (Frankel defects).
D. Twinning to form mirror images along a low energy boundary or crystal plane.
13. All of the following statements about strain energy are correct, EXCEPT:
A. It is less for sites at grain boundaries than for internal sites within the crystal structure.*
B. It is caused by generation and movement of dislocations through shear or plastic
deformation.
C. It results from trapped vacancies in the crystal lattice.
D. It is proportional to length of dislocation, shear modulus, and shortest distance
between equivalent lattice sites (points).
14. All of the following statements about slip are correct, EXCEPT:
A. Slip, or shear along crystal planes, results in an irreversible plastic deformation or
permanent set.
B. It involves only a few atoms at a time in a series of small dislocation movements.
C. Slip planes lie in the direction of the longest distance between neighboring sites in the
crystal lattice.*
D. Ease of slippage is directly related to number of low energy slip planes existent in the
lattice structure.
15. When a metal is cold worked all of the following generally occur EXCEPT:
A. Recrystallization temperature decreases
B. Ductility decreases
C. Grains become equi-axed*
D. Slip or twinning occurs
16. All of the following statements about strain hardening are correct except:
A. Strain hardening strengthens. Resistance to deformation increases with
The amount of strain present.
B. Strain hardening is relieved during softening, annealing above recrystallization
temperature.
C. Strain hardening is produced by cold working (deformation below the
recrystallization temperature).
D. More strain hardening requires more time-temperature exposure for relief.*
.17. The length of arc between the two sides of a gear tooth on the pitch circle:
A. Axial Plane
B. Circular Thickness*
C. Chordal Curves
D. Helex Angle
18. SAE steel that responds to heat treatment.
A. SAE 1060
B. SAE 1020
C. SAE 1040
D. SAE 1117 *
19. The differential of the shear equation is which one of the following?
A. Bending Moment of the Beam
C. Slope of the elastic curve
B. Load of the beam*
D. Tensile strength of the beam
20. A type of welding whereby a wire or powder from the nozzle of a spray gun is infused by a
gas flame, arc of plasma jet and the molten particles are protected in form of a spray by
means of compressed air or gas.
A. Metal Spray Welding
B. Plasma-Arc Welding*
C. Electro-Slug Building
D. Electro-beam welding
21. Honing is used:
A. To remove only a small amount of metal
B. to correct out-of-roundness of a bore
C. to correct axial run-out of a bore
D. on surfaces brought to a high degree of surface finish*
22. Tungsten is added to high speed metal
A. to make the material more ductile*
B. To prevent the material from cracking during heat treatment
C. to increase the hardness at red heat
D. to make the material easier to forge
23. An impact test for which the specimen is supported at one end as a cantilever
A. Izod Test*
B. Charpy test
C. Brinnel Test
D. Endurance Test
24. A hydrostatic bearing is one in which
A. the lube oil is supplied under pressure *
B. the lube oil is not pressurized
C. there is marginal lubrication
D. the bearing is lightly loaded
25. Heating or cooling of steel that produces a rounded form of carbide.
A. Spherodizing *
B. Annealing
C. Normalizing
D. Embrittleness
26. Split pulley or pulley made of separate section bolted together at the rim, the
maximum speed should be limited to about __________% of the maximum speed
of solid pulley.
A. 65 to 75%
B. 55 to 60 % *
C. 80 to 90%
D. 45 to 60%
27. The normal density or work space requirement to use in the design of a work room is
_________ cubic feet per person.
A. 38.83
B. 423.46 *
C. 40.33
D. 35.4
28. Chromium steel ( to include heat and corrosion resistant ) designation
A. SAE 56XX
B. SAE 61XX
C. SAE 9XX
D. SAE 514XX*
29. The softening of metal by heat treatment and most commonly consists of heating the metals
up to near molten state and then cooling them slowly.
A. Tempering
B. Quenching
C. Annealing *
D. Cold Working
30. A special metal formed when two or more metals are melted together
A. Alloy*
B. Titanium
C. Brass
1. The ability of a material to resist being crushed
A. Tensile strength
B. Shearing strength
C. Compressive strength*
D. Torsion
D. Compound
2. The ability of metal to stretch, bend or twist without breaking or cracking
A. Elasticity
B. Ductility*
C. Brittleness
D. Plasticity
3. The property of a material which resist forces acting to pull the material apart.
A. Shear strength
B. Tensile strength*
C. Compressive strength
D. Bearing strength
4. The property in steel which resist indention or penetration
A. Hardness*
B. Elasticity
C. Ductility
D. None of these
5. The crankshaft and big-end bearing of a multi-cylinder internal combustion engine are generally
A. Phosphor-bronze
B. Steel-backed white metal*
C. Hardened steel
D. Cast iron
6. The British Association screw thread is widely used for
A. Self-tapping screws
B. Accurately machined fitted bolts
C. Electrical and IT applications*
D. Heavy engineering application
7. The screwed fastening made from a short length of bar and threaded at both ends is called a
A. Setscrew
B. Black bolt
C. Stud*
D. Machine screw
8. Which of the following is classed as a positive locking device?
A. A tab washer*
B. A lock nut
C. A spring washer
D. A friction nut
9. For applications were rivet heads must be flush with the joint surface it is usual to use
A. Conoldal headed rivets
B. Pan headed rivets
C. Round headed rivets
D. Countersunk headed rivets*
10. For application where access is only possible from one side of a riveted joint it is usual to use
A. Flat headed rivets
B. Pan headed rivets
C. Pop rivets*
11.
12.
13.
14.
15.
16.
17.
18.
19.
D. Round headed rivets
The angle turned through by a cam whilst its follower is stationary is called the
A. Pressure angle
B. Angle of lap
C. Dwell angle*
D. Angle of friction
An inversion of plane mechanism can be obtained by
A. Changing the input motion
B. Reversing the input motion
C. Changing the lengths of the links
D. Changing the link that is fixed*
Two links in a mechanism that are hinged or pin-jointed together constitute a
A. Turning pair*
B. Sliding pair
C. Screwed pair
D. Fixed pair
In the color coding of pipe, the color for a pipeline of air is
A. Light blue
B. Light orange
C. White
D. Green
In the color coding of pipe, the color for a pipeline of water is
A. Light blue
B. Green*
C. Brown
D. Silver grey
In the color coding of pipe, the color for pipeline of steam is
A. Light orange
B. white
C. silver grey*
D. light blue
the color for a pipeline of electricity in the color coding of pipe is
A. light orange*
B. white
C. silver grey
D. light blue
the color coding for a pipe, the color for pipeline of communication is
A. light blue
B. white*
C. brown
D. light orange
In the color coding of pipeline of fuel oil in the color coding of pipe is
A. Light blue
B. Brown*
20.
21.
22.
23.
24.
25.
26.
27.
28.
C. White
D. Light orange
Which of the following metals will respond to heat treatment
A. Cast iron
B. Wrought iron
C. Medium carbon steel*
D. Low carbon steel
The ability of metal to withstand loads without breaking down is
A. Stress
B. Strength*
C. Strain
D. Elasticity
Which of the following metals is non-magnetic
A. Cast iron
B. Alloy steel
C. Cast steel
D. Manganese steel*
A machining operation whereby the tool reciprocates and the feed is stationary
A. Planning
B. Shaping*
C. Turning
D. Reaming
Which of the following is not a tap used for cutting threads in holes
A.
Tapping tap*
B.
Plug tap
C.
Taper tap
D.
Bottoming tap
When added to steel, this alloy element maintains its mechanical properties at high temperature
A. Copper
B. Chromium
C. Lead
D. Cobalt*
Which of the following is also known as phosphor?
A. Tin bronze*
B. Silicon bronze
C. Beryllium bronze
D. Aluminum bronze
Which iron oxide has the highest iron content?
A. Hematite
B. Magnetite*
C. Sulfide
D. Silicate
Iron ores classed according to their chemical composition except
A. Sulfides
B. Silicon*
C. Carbonate
D. Phosphorous
29. What element reduces strength and increase brittleness found in steel?
A. Manganese*
B. Zinc
C. Sulfur
D. Phosphorous
30. What is employed as an inhibitor to brass metals in order to prevent dezincification
A. Lead
B. Zinc
C. Arsenic*
D. Antimony
E. With the arc welding rate of 18 in/min, how long will it take to weld ½ in thick plate by 3
feet long seam?
A. 3 min
B. 1.6 min
C. 2 min*
D. 5 min
F. Two parallel shafts connected by pure rolling turn in the same direction having a speed of
2.75. What is the distance of the shafts if the smaller cylinder is 32 cm in diameter?
A. 16.67 cm
B. 25.25 cm
C. 30.25 cm
D. 19.25 cm*
G. A lineshaft runs at 360 rpm. An 18” pulley on the shaft is belt connected to a 12” pulley on
the countershaft. From a 15” pulley on the countershaft, motion is transmitted to the
machine. Compute/ check the required diameter of the pulley on the machine to give a
spindle speed of 660 rpm.
A. 16”
B. 12 ¼ *
C. 4 ½
D. 8 ½
H. A steel rod 30 mm & 800 mm long has an allowance elongation not to exceed 1.5 mm, find
the allowable load in KN.
I.
A. 274*
B. 248
C. 316
D. 235
Compute the induced/compressive stress, in kpa, of a steel solid shafting of 50 mm diameter
and 800 mm in length that is subjected to an increase of temperature by 800 C.
A. 181,813
B. 243,816
C. 218,182
D. 196,560*
J.
What is the modulus of elasticity if the stress is 4,000 psi and unit a strain of 0.00105?
A. 41.905 x 10^6*
B. 42.310 x 10^6
C. 42.202 x 10^6
D. 43.201 x 10^6
K. A 2.5 in diameter by 2 in long journal bearing is to carry a 5500-lb load at 3600 rpm using
SAE 40 lube oil at 2000F through a single hole at 25 psi. Compute the bearing pressure.
A. 1100 psi*
B. 1000 psi
C. 900 psi
D. 940 psi
L. What force P is required to punch a ½ in hole on a 3/8 in thick plate if the ultimate shear
strength of the plate is 42,000 psi?
A. 24,840 lbs
B. 24,910 lbs
C. 24,620 lbs
D. 24,740 lbs*
M. What is the working strength of a 2” bolt which is screwed up tightly in a packed jointly
when the allowable working stress 12,000 psi?
A. 20,120 lbs
B. 20,400 lbs*
C. 20,100 lbs
D. 20,300 lbs
N. Compute for the twisting moment in in-lb developed when the shaft delivers 20 hp at 1200
rpm.
A. 1266
B. 915
C. 1050*
D. 935
O. Find the torsional deflection, in degrees, of a solid steel shaft, 110 mm OD x 1.4 m long
subject to 3.1 x 106 N-mm torque. The torsional modulus of elasticity is 80,000 N/mm-mm.
A. 0.222
B. 0.194
C. 0.28
D. 0.21*
P. Compute the nominal shear stress at the surface in Mpa for a 40 mm diameter shaft that
transmit 750 Kw at 1500 rpm. Axial and bending loads are assumed negligible. Torsional
shearing stress is 28 N/mm2.
A. 218
B. 231
C. 312
D. 380*
Q. A hollow shaft has inner diameter of 0.035 m and outer diameter of 0.06 m. Compute for
the torque if the shear stress is not to exceed 120 Mpa in N-m.
A. 4500 *
B. 4400
C. 4200
D. 4150
R. Compute the speed of the gear mounted on a 52.5 mm diameter shaft receiving power from
a driving motor with 250 Hp. Answer: B
A. 2180 rpm
B. 2282 rpm*
C. 2070 rpm
D. 2340 rpm
S. A square key is to be used in 40 mm diameter shaft and that will developed a 2 KN-m
torque. If bearing stress of the key is 400 Mpa, determine the cross sectional dimension of
square key to be used if key length is 30 mm.
A. 324.80 mm2
B. 246.81 mm2
C. 446.85 mm2
D. 277.77 mm2*
T. A 100 KN force is acting on a key that has a length of 4 times its height. If bearing stress of
key is 400 Mpa, determine the height of key.
A. 10.54 mm
B. 11.18 mm*
C. 12.65 mm
D. 15.26 mm
U. A flanged bolt coupling consists of eight 20 mm diameter steel bolts space evenly around a
bolt circle 300 mm in diameter. If the coupling is subjected to a torque of 15.1 KN-m,
determine the maximum shearing stress in the bolts?
A. 40 Mpa*
B. 38 Mpa
C. 70 Mpa
D. 29 Mpa
V. Find the thickness of a metal needed in the semi-spherical end of cylindrical vessel 0.70
meter in diameter subjected to an internal pressure of 2.7 N/mm2. The material is mild
carbon steel and tensile stress is 69 N/mm.
A. 5.2 mm
B.6.02 mm
C. 7.53 mm
D. 6.84 mm*
W. A cylindrical tank with 10 inches inside diameter contains oxygen gas at 2500 psi. Calculate
the required wall thickness in millimeter under stress of 28,000 psi.
A. 10.54
B. 11.34*
C. 10.23
D. 12.45
X. A spherical tank 15 mm thick has an internal pressure of 5 Mpa. The joint efficiency is 96%
and stress is limited to 46,875 Kpa. Find the tank internal radius.
A. 530 mm
B. 200 mm
C. 270 mm*
D. 310 mm
Y. A cylindrical tank has an inside diameter of 5 in and is subjected to an internal pressure of
500 psi. If maximum stress is 1200 pasi, determine the required thickness.
A. 2 in
B. 1.7 in
C. 1.4 in*
D. 1.9 in
Z. A thick wall cylinder has 50 mm thick and internal diameter of 300 mm. If stress is limited to
30 Mpa, determine the maximum internal pressure.
A. 8.1 Mpa
B. 8.3 Mpa
C. 8.9 Mpa
D. 8.4 Mpa*
AA. If the pitch of a screw is 2/9 find the thread per inch.
A. 0.35
B. 4.5
C. 5.7
D. 1.7
BB. Find the horsepower lost when a collar is loaded with 1000 lb rotates at 25 rpm, and has a
coefficient of friction 0.15. The outside diameter of the collar is 4 in and the inside diameter
is 2 in. Answer: C
A. 0.044 hp
B. 0.82 hp
C. 0.089 hp*
D. 0.66 hp
CC. Compute how many 3/8 inch diameter set screws required to transmit 3 HP at a shaft speed
of 1000 rpm. The shaft diameter is 1 inch. Answer: B
A. ½
B. 2*
C. 3
D. 1
DD. What is the frictional Hp acting on a collar loaded with 100 kg weight? The collar has an
outside diameter of 100 mm amd an internal diameter of 40 mm. The collar rotates at 1000
rpm and the coefficient of friction between the collar and the pivot surface is 0.15.
A. 0.8 Hp*
B. 0.3 Hp
C. 0.5 Hp
D. 1.2 Hp
EE. A plate 200 mm wide and 25 mm thick with strength of 410 Mpa is to be shear along its
width. During shearing process an 800 mm mean diameter flywheel changes its speed from
200 rpm to 180 rpm. Determine the weight of flywheel to be use.
A. 3265.85 kg
B. 3452.72 kg
C. 3821.74 kg
D. 3845.97 kg*
FF. A flywheel has a rim weight of 450 kg and mean radius of 450 mm. If the rim width is 5 times
the rim thickness and material density is 7200 kg/m3, determine the width of flywheel.
A. 332.45 mm*
B. 242.51 mm
C. 286.77 mm
D. 298.78 mm
GG. A coil spring with 5 cm outside diameter is required to work under the load of 190 N. The
wire diameter is 5 mm, the spring is to have 6 active coils and the ends are to be closed and
ground. Determine the total number of coils. The modulus of rigidity is 80 Gpa, and the
mean radius is to be 23 mm, with 7 mm pitch of the spring.
A. 3.5 coils
B. 8.5 coils*
C. 7.5 coils
D.9.5 coils
HH. A helical spring is made by wrapping steel wire 20 mm diameter around a forming cylinder
150 mm in diameter. Compute the elongation of the spring without exceeding a shearing
stress of 140 Mpa if it is composed of 18 turns.
A. 97.42 mm
B. 100.5 mm
C. 117.57 mm*
D. 89.61 mm
II. It is found that a load of 50 lbs on extension coil spring deflects 8.5 in. What load will the
spring deflects 2.5 in?
A. 10.64 lb
B. 12.48 lb
C. 13.49 lb
D. 14.70 lb*
JJ. A spring sustain 200 ft-lb of energy with deflection of 3 in. Assume that the coil diameter is 7
times the wire diameter and allowable stress of 100,000 psi, determine the wire diameter.
A. 0.416 in*
B. 0.321 in
C. 0.569 in
D. 0.673 in
KK. A spring with plain ends has 15 active coils, diameter of 6 mm and pitch of 10 mm. If spring
rate is 100 KN/m, determine the solid force.
A. 9 KN
C. 6 KN*
B. 5 KN
D. 7 KN
LL. A spring has a spring rate of 30 KN/m. If wire diameter is 10 mm with mean diameter of 70
mm, determine the number of active coils. G = 80 GN/m2.
A. 6.54
B. 7.82
C. 8.52
D. 9.72*
MM. The power required to shear a plate 50 mm thick for 10 seconds is 5 Kw. If ultimate
strength of plate is 420 Mpa. How wide should the plate be?
A. 80.42 mm
B. 85.65 mm
C. 90.27 mm
D. 95.23 mm*
NN. A 2 in horizontal shaft rotates in a sleeve type bearing. The coefficient of friction is 0.10 and
the shaft applies a load of 500 lb. Find the frictional resistance.
A. 20 lbs
B. 40 lbs
C. 35 lbs
D. 50 lbs*
OO. A bearing sustains a load of 4450 N. The shaft diameter is 100 mm, the coefficient of sliding
friction is 0.01, and the shaft speed is 400 rpm. Find the horsepower lost in the bearing.
A. 93.20 watts*
B. 76.44 watts
C. 83.46 watts
D. 45.24 watts
PP. A 6 in diameter pulley turning at 600 rpm is belt connected to ma 12 in diameter pulley. If
there is 4% slip, find the speed of the 12 in pulley.
A. 188 rpm
B. 223 rpm
C. 203 rpm
D. 288 rpm*
QQ. A 5 mm round belt connects a 20 mm pulley with a 40 mm pulley. The center distance is 150
mm. The 20 mm pulley rotates at 100 rpm and the coefficient of friction of the belt is 0.25.
Find the horsepower capacity for this arrangement if the allowable belt stress is 2.6 N/mm2.
A. 0.12 kw
B. 0.23 kw
C. 0.00282 kw*
D. 0.054 kw
RR. A disc clutch has 6 pairs of contracting friction surfaces. The frictional radius is 2 in and the
coefficient of friction is 0.3. An axial force of 100 lbs acts on the clutch. The shaft speed is
400 rpm. How much horsepower can the clutch transmit?
A. 2.28 hp*
B. 1.24 hp
C. 3.22 hp
D. 4.23 hp
SS. A cone clutch has cone elements at an angle of 10°. The clutch transmits 20 hp at a speed of
100 rpm. The mean diameter of the conical friction sections is 16 in and the coefficient of
friction is 0.3. Find the axial force needed to engage the clutch.
A. 246.37 lbs*
B. 222.56 lbs
C. 235.56 lbs
D. 346.78 lbs
TT. In a band clutch, the ratio of the pull on the tight side of the band to that of the slack side is
4:1. The band contacts the drum for 250 degrees. What is the coefficient of friction?
A. 0.124
B. 0.318*
C. 0.234
D. 0.463
UU. A band clutch has an angle of contact of 270° on a 15 in diameter drum. The rotational
speed of the drum is 250 rpm and the clutch transmits 8 hp. The band is 1/16 in thick and
has a design stress of 5000 psi. How wide should the band be? Assume a coefficient of
friction of 0.40.
A. 2.124 in
B. 3.235 in
C. 1.014 in*
D. 4.355 in
VV. The angle of contact of a band clutch is 250 degrees. The cross section of the band is 1/16 in
x 1.5 in. The design stress for the band material is 8,000 psi. If the drum is 16 inches in
diameter and rotates at 350 rpm, what is the horsepower capacity of the clutch? The
coefficient of friction is 0.4.
A. 20.34 hp
B. 15.23 hp
C. 22.34 hp
D. 27.50 hp*
WW. Find the power capacity under uniform wear of a cone clutch with mean diameter of
250 mm if the conical elements are inclined 8 degrees and the axial force is 450 N. The
rotational speed of the driver is 200 rpm and the coefficient of friction is 0.20.
A. 1.683 kw*
B. 2.340 kw
C. 1.288 kw
D. 3.235 kw
XX. A flywheel on a press rotating at 120 rpm is slowed to 102 rpm during a punching process
that requires ¾ sec for the punching portion of the cycle. What angular deceleration the
flywheel experience?
A. -2.52 rad/s2*
B. -5.45 rad/s2
C. -1.23 rad/s2
D. -8.46 rad/s2
YY. A 100 lb body is being hoisted by a winch, the tension in the hoisting cable being kept
constant at 110 lb. At what rate the body is accelerated?
A. 1.23 ft/s2
B. 3.22 ft/s2*
C. 2.22 ft/s2
D. 4.44 ft/s2
ZZ. A pile driver weighing 200 pounds strikes the top of the pile after being fallen from a height
of 20 ft. If forces a pile into the ground a distance of ½ foot. What is the average force of the
blow?
A. 8,200 lbs*
B. 8,500 lbs
C. 8,900 lbs
D. 8,700 lbs
AAA. A pile driver of mass 100 kilograms falls 10 meters and moves the pile a distance of 0.3
m. What is the average force of the blow?
A. 23.55 KN
B. 33.68 KN*
C. 54.33 KN
D. 43.24 KN
BBB. A 1000 lb block is pulled up a 2-degree incline by a cable exerting a constant force F of
600 lbs. If the coefficient of friction between the block and the plane is 0.5, how fast will the
block be moving up the plane 10 seconds after the pull is applied?
A. 12.4 mph
B. 10.2 mph
C. 17.3 mph
D. 14.3 mph*
. A 14 m cantilever beam has a concentrated load of 25 KN/m at the mid-span. Find the maximum
slope of the beam. (EI = 9,000 Kn.m2).
A. 0.00237 rad
B. 0.0681 rad*
C. 1.23 rad
D. 0.123 rad
32. A 8 m simply supported beam has a uniform load of 2 KN/m from left end to right end and
concentrated load of 10 KN at the center has a maximum deflection of: (EI = 5,000 Kn.m2).
A. 12.34 mm
B. 42.67 mm*
C. 21.43 mm
D. 34.34 mm
33. A car travelling at 40 m/s in a radius of 1000 m will have a banking angle of:
A. 7.340
B. 183.40
C. 9.370*
D. 12.30
34. Compute for the torsional deflection, in degrees, of a 110 mm diameter, 1.4 m long shaft
subjected to a twist moment of 3 x 106 N.mm. The torsional modulus of elasticity is 83000 N/mm2.
A. 0.27
B. 0.32
C. 0.20*
D. 0.23
35. A small countershaft is 1 ½ inch in diameter and has an allowable stress of 8500 psi. Find the
horsepower delivered by the shaft at a speed of 15.7 rad/s.
A. 7.20
B. 1.4
C. 13.31*
D. 14.71
36. A force tangent to a foot diameter pulley is 5 KN and is mounted on a 2 inches shaft. Determine
the torsional deflection if G = 83 x 106 Kpa.
A. 0.806 0/m*
B. 0.654 0/m
C. 0.768 0/m
D. 0.948 0/m
37. What is the minimum diameter of a steel shaft which will be used to operate a 14 KN-m torque
and will not twist more than 30 in a length of 6 m? ( G = 83 x 106 Kpa)
A. 100.64 mm
B. 96.80 mm
C. 118.55 mm*
D. 110.72 mm
38. An 800 mm diameter circular saw blade is driven by a 1800 rpm motor with belt speed ratio
of 1.8. Find the peripheral speed of the blade.
A. 137.44 ft/sec*
B. 140.65 ft/sec
C. 132.44 ft/sec
D. 135.21 ft/sec
39. A machine shaft is supported on bearings 1 m apart is to transmit 190 Kw at 300 rpm while
subjected to bending load of 500 kg at the center. If maximum shearing stress is 40 Mpa, determine
the shaft diameter.
A. 100 mm
B. 90 mm
C. 91 mm*
D. 98 mm
40. A 100 mm diameter shaft is subjected to a torque of 6 KN-m and a bending moment of 2.5
KN-m. Find the maximum bending stress developed.
A. 45.94 Mpa*
B. 60.25 Mpa
C. 50.28 Mpa
D. 55.56 Mpa
41. A flat key is to be designed for 75 mm diameter shaft which will transmit 150 KW at 400 rpm.
If allowable shearing stress is 200 Mpa and key width is 55 mm, determine the length of key.
A. 30.65 mm
B. 31.83 mm*
C. 33.75 mm
D. 32.85 mm
42. A rectangular key is used in pulley to transmit 100 Kw at 1000 rpm on 50 mm shaft diameter.
Determine the force required to remove the shaft from the hub if friction is 0.4.
A. 33.24 KN
B. 36.85 KN
C. 28.35 KN
D. 30.55 KN*
43. A flanged coupling having 180 mm bolt circle and 19 mm thick uses 8 bolts, 16 mm diameter
to connect two shaft. It is used to transmit 60 Kw at 180 rpm. Determine the factor of safety in
bearing if yield point in compression is 448 Mpa.
A. 15.6
B. 18.5
C. 30.8*
D. 25.5
44. A turbine connected to generator by means of flanged coupling that has a bolt circle diameter
of 500 mm. The generator output is 40 MW, 3600 rpm and 90% efficiency. If there are 16 bolts,
determine the force acting on each bolt.
A. 26.42 KN
B. 29.48 KN*
C. 35.62 KN
D. 32.61 KN
45. A 75 mm diameter shaft is transmitting 300 Kw at 600 rpm. A solid coupling has a 6 bolts each
18 mm in diameter. Find the required bolt circle diameter if shearing stress in bolts is 27.5 Mpa.
A. 227.50 mm*
B. 233.70 mm
C. 255.50 mm
D.272.60 mm
46. Determine the bursting pressure of steel with diameter of 10 inches and make of ¼ in thick
plate. The joint efficiency is at 70% and the tensile strength is 60 ksi.
A. 4,020 psi
B. 4,002 psi
C. 2,400 psi
D. 4,300 psi*
47. Determine the safe wall thickness of a 30 inches steel with internal pressure of 7.82 Mpa. The
yield stress of material is at 275.48 Mpa. The factor of safety to use is 2.0.
A. ¾ in
B. 23.4 cm
C. 21.7 mm*
D. 5/8 in
48. Determine the bursting steam pressure of a steel shell with a diameter of 10 inches and made
of ¼ inch thick steel plate. The joint efficiency is at 70% and the tensile strength is 60 ksi.
A. 4,200 psi*
B. 10.6 psi
C. 52.8 psi
D. 8,500 psi
49. Compute the safe wall thickness of a 76.2 cm diameter steel tank. The tank is subjected to 7.33
Mpa pressure and the steel material has yield stress of 215.4 Mpa. The factor of safety to use is 3.
A. 1 ½ in
B. 3.79 cm*
C. 4.19 cm
D. 3.69 cm
50. A steel cylinder air receiver with 5 feet diameter and pressure load of 180 psi, design stress of
9500 psi maximum. The pressure vessel is to be provided with 1 ½” diameter drain valve installed
at the bottom of the vessel and safety pressure relief valve installed either at the top most or at the
side with prop-out rating of 200 psi. Assume a 100% weld joint efficiency. The lap welding tensile
strength is 65,000 psi. Determine the bursting pressure of this air receiver.
A. 1254 psi
B. 1354 psi*
C. 1454 psi
D. 1254 psi
51. Determine the thickness of a steel air receiver with 30 inches diameter and pressure load of
120 psi, design stress of 8000 psi.
A. 1/5 in*
B. 3/8 in
C. 5/8 in
D. 1/2 in
52. Compute the working strength of 1 in bolt is screwed up tightly in packaged joint when the
allowable stress is 13,000 psi.
A. 3,600 lbs
B. 3,400 lbs
C. 3,800 lbs
D. 3,900 lbs*
53. A flywheel for a punching press must be capable of furnishing 3400 N-m of energy during the
25% revolution while the hole is being punched. The flywheel maximum speed is 200 rpm and the
speed decreases 8.7% during the load stroke. The mean radius of the rim is 1016 mm diameter and
contributes 90% of the energy requirements. Approximate total weight of the flywheel to be 1.20
times that of the rim. Find the weight of the flywheel.
A. 97.6 kg*
B. 65.2 kg
C. 103.34 kg
D. 234.6 kg
54. A press is used to punch 10 holes per minute of 30 mm diameter hole from 25 mm thick plate.
Determine the power needed to punch a hole if ultimate shear stress is 400 Mpa.
A. 2.68 Kw
B. 1.97 Kw*
C. 3.58 Kw
D. 0.97 Kw
55. The kinetic energy needed to punch a hole is 5 KJ. What is the maximum thickness of a hole
that can be punch if hole diameter is 25 mm and ultimate shearing stress of plate is 420 Mpa.
A. 12.61 mm
B. 14.78 mm
C. 17.41 mm*
D. 19.62 mm
56. A double square thread power screw has a mean radius of 80 mm and a pitch of 10 mm is used
to lift a load of 80 KN. If friction of screw is 0.13 and collar torque is 20% of input torque,
determine the input torque required.
A. 830.76 N-m
B. 836.76 N-m
C. 1246.30 N-m
D. 1366.30 N-m*
57. The root diameter of a double square thread power screw is 0.55 in. The screw has a pitch of
0.2. Determine the major diameter.
A. 0.523 in
B. 0.751 in*
C. 0.842 in
D. 0.961 in
58. A power screw consumes 6 Hp in raising a 2800 lb weight at the rate of 30 ft/min. Determine
the efficiency of the screw.
A. 12.5%
B. 16.81%
C. 42.41%*
D. 66.62%
59. A concentric helical spring is use to support a load of 90 KN. The inner spring has a rate of
495.8 KN/m and outside spring is 126.5 KN/m. If initially the inner spring is 25 mm shorter than
the outer spring, find the percent load carried by inner spring.
A. 34.56%
B. 55.86%
C. 68.26%
D. 76.80%*
60. A helical spring having square and ground ends a total of 18 coils and its material has modulus
of elasticity in shear of 78.910 Gpa. If spring has an outside diameter of 10.42 cm and wire
diameter of 0.625 cm, compute the maximum deflection that can be produced in the spring due to
a load of 50 kgs.
A. 302 mm
B. 491 mm*
C. 342 mm
D. 322 mm
61. An extension coil spring is to be elongated 5 in under a load of 50 lb. What is the spring rate?
A. 15 lb/min
B. 10 lb/min*
C, 20 lb/min
D. 22 lb/min
62. A triple thread worm has a pitch diameter of 3 inches. The wheel has a 25 teeth and a pitch
diameter of 5 inches. Material for both the worm and the wheel is of phosphor bronze. Compute
the helix angle (tan α).
A. 0.20*
B. 0.30
C. 0.41
D. 14
63. A helical gear having a 14 1/20 normal pressure angle and transverse diametrical pitch of
2.3622 per cm. The helix angle is at 450 and has 8 teeth. Compute the transverse pressure angle in
degrees.
A. 22.20
B. 18.90
C. 19.40
D. 20.10*
64. Two idlers of 28T and 26T are introduced between the 24T pinion with a turning speed of 400
rpm driving a final 96T gear. What would be the final speed of the driven gear and its direction
relative to the driving gear rotation?
A. 130 rpm and opposite direction
B. 80 rpm and same direction
C. 100 rpm and opposite direction*
D. 110 rpm and same direction
65. A spur pinion rotates at 1800 rpm and transmits to a mating gear 30 HP. The pitch diameter is
4” and the pressure angle is 14 1/2. Determine the tangential load in lbs.
A. 485
B. 535
C. 525*
D. 485
66. Compute the pitch angle of a bevel gear given the pinion’s number of teeth of 14 and 42 teeth
on the gear.
A. 18.40*
B. 33.40
C. 28.40
D. 38.50
67. Compute the circular pitch of a pair of gears having a ratio of 4 and a center distance of 10.23.
Each gear has 72 teeth and pinion has 18 teeth.
A. 0.8095
B. 0.8035
C. 0.7855*
D. 0.8086
68. A 20 mm shaft uses sleeve bearings. The total load per bearing is 2000 N. An L/D ratio of 2.5
is desired. What is the bearing pressure?
A. 1 Mpa
B. 3 Mpa
C. 2 Mpa*
D. 4 Mpa
69. A 22 mm diameter shaft is supported by sleeve bearing at a distance of 0.50 m. A load of 2.2
KN is applied at 0.2 m from the left end. The sleeve bearings have an L/D ratio of 1.5. Find the
maximum bearing pressure.
A. 1.82 Mpa*
B. 3.45 Mpa
C. 2.13 Mpa
D. 5.23 Mpa
70. A sleeve bearing is to have an LD ratio of 1.0 and an allowable bearing pressure of 0.5 MN/m2.
Find the inside diameter and the length of the bearing if it is to sustain a load of 2550 N.
A. 23.45 mm
B. 71.41 mm*
C. 45.34 mm
D. 98.34 mm
71. It is the science of motion that can be solved in terms of scalar or vector algebra.
A. curvilinear translation
B. projectiles
C. acceleration
D. kinematics*
72. The band of a band brake has a contact angle of 180°. It is found experimentally that the pulls
on the bands are 275 kg and 100 kg respectively under certain operating conditions. Find the
coefficient of friction.
A. 0.974
B. 0.567
C. 0.198
D. 0.322*
73. A cone clutch has an angle of 10° and coefficient of friction of 0.42. Find the axial force
required if the capacity of the clutch is 7 kw at 500 rpm. The mean diameter of the active conical
sections is 300 mm.
A. 234.45 N
B. 186.45 N
C. 368.48 N*
D. 492.45 N
74. How much torque can a cone clutch transmit if the angle of the conical elements is 10 degrees
the mean diameter of the conical clutch sections 200 mm and an axial force of 550 N is applied?
Assume the coefficient of friction is 0.45.
A. 123.22 N-m
B. 34.56 N-m
C. 142.53 N-m*
D. 234.56 N-m
75. If the inertia is 90 lb-ft2 and the speed of the driven shaft is to be increased from 0 to 2500 rpm
in 5 seconds, shaft material is of SAE 4140 with yield strength of 110,000 lb/in2, find the clutch
starting torque in ft-lb.
A. 169
B. 138
C. 146*
D. 192
76. A body of mass 50 kg is being hoisted by a winch, and the tension in the cable is 600 N. What
is the acceleration?
A. 4.23 m/s2
B. 5.33 m/s2
C. 3.24 m/s2
D. 2.19 m/s2*
77. A flywheel has a diameter of 3 ft and weighs 1000 pounds. What torque must be applied,
neglecting bearing friction, to accelerate the flywheel at the rate of 100 revolutions per minute, per
second?
A. 265.8 ft-lbs
B. 566.80 ft-lbs
C. 365.80 ft-lbs*
D. 665.80 ft-lbs
78. A flywheel has a diameter of 1.5m, and a mass of 800 kg. What torque is needed to produce
an angular acceleration of 100 revolutions per minute, per second?
A. 5356 N.m
B. 4366 N.m
C. 3356 N.m
D. 2356 N.m*
79. The outside diameter of a gear having a pressure angle of 14 ½ degrees is to be reduced by
0.2746 in or an amount equal to the increased in diameter of its mating pinion. The circular pitch
is 0.6283 in. Determine the circular tooth thickness at the standard pitch diameter.
A. 0.434 in
B. 0.843 in
C. 0.244 in*
D. 0.672 in
80. A pinion has 15 teeth of 3 diametrical pitch. Find the chordal thickness at the standard pitch
diameter.
A. 0.643 in
B. 0.523 in*
C. 0.863 in
D. 0.234 in
31. A multiple disc clutch of 10 steel disc and 9 bronze disc. the effective outside and inside
diameter are 20.32 cm and 15.24 cm, respectively if the axial force of 450 Newton is applied and
the shaft turns at 1200 rpm, find the horsepower capacity, assume a coefficient of friction of
0.27.
a. 39.566 hp*
b. 40.482 hp
c. 37.456 hp
d. 35. 659 hp
32. An engine of a motor vehicle with a wheel diameter of 712 mm develops 50 kW at 2,000 rpm
combined efficiency of the differential and transmission is 75% with an over-all speed reduction
to. Determine the torque to be delivered by the clutch N-m.
a. 239 N-m*
b. 359 N-m
c. 432 N-m
d. 471 N-m
33. A sleeve bearing has an outside diameter of 1.5 in and a length of 2 in, the wall thickness is 3/16
in. The bearing is subjected to a radial load of 450 lb. Find the bearing pressure.
a. 100 psi
b. 150 psi
c. 200 psi*
d. 250 psi
34. Determine the machining time to drill a hole of 20 mm diameter in a workpiece 25 mm thick by a
drill at a cutting speed of 30 m/min with a feed of 0.2 mm/rev.
a. 17.6 s
b. 14.5 s
c. 19.5 s*
d. 22.9 s
35. A carbide milling cutter 250 mm in diameter is used to cut a block mild steel with a plain cutter.
The block is 500 mm long. If the feed is 0.50 mm/rev and depth of cut is 1.2 mm, determine the
time required to take one cut. The over travel is 16 mm. the cutting speed is 80 m/min.
a. 8.45 min
b. 7.45 min
c. 9.45 min
d. 10.45 min*
36. Determine the time required to turn a brass component 50 mm diameter and 100 mm long at a
cutting speed of 36 m/min. the feed is 0.4 and only one cut is taken.
a. 2.2 min
b. 3.3 min
c. 1.2 min*
d. 4.4 min
37. A tool will cut for 4 hrs before it needs sharpening. Determine the time charged to one cycle if it
takes 12 minutes to change the tool can be sharpened 10 times before it is discarded.
a. 62 m/min
b. 82 m/min*
c. 72 m/min
d. 52 m/min
38. Calculate the power consumed during cutting of a low carbon steel bar 40 mm diameter if
cutting force is 150 kg at 200 rpm.
a. 0.46 hp
b. 0.66 hp
c. 0.75 hp
d. 0.83 hp*
39. A band brake is installed on a drum rotating at a 250 rpm, and a diameter of 900 mm. the angle
of contact is 1.5 pi radians and one end of the brake band is fastened to a fixed pin while the
other end to the brake arm 150 mm from the fixed pin. The coefficient of friction is 0.25 and the
straight brake arm is 1000 mm long and is placed perpendicular to the diameter bisecting the
angle of contact. Determine the net belt pull in kN applied at the kilowatts is being absorbed.
a. 4.24*
b. 3.90
c. 4.0 d. 3.8
40. A leather belt 6 inches wide by ¼ in thick running at 4000 ft/min connects 12 in and 60 in. in
diameter pulleys. The angles of contact are 270 deg. and 240 deg. for small and large pulleys
respectively. Coefficient of friction on large pulley is 0.4 on small pulley 0.3. if the allowable
tension is 100lb per in. determine the maximum horsepower that can be transmitted without
considering centrifugal force.
a. 44 hp
b. 55 hp*
c. 33 hp
d. 66 hp
41. A 10" diameter pulley is belt driven with a net torque of 250 ft-lbs. The ratio of tensions in the
tight to stack sides of the belt is 4 to 1. What is the maximum tension in the belt?
a. 250 lbs.
b. 800 lbs.*
c. 83 lbs.
d. 500 lbs.
42. An air compressor is driven by a 7.5 HP electric motor with a speed of 1750 rpm with A-60 Vbelts of length 61.3 in. the pitch diameter of the small sheave is 110mm and the larger sheave is
200 mm. service factor is 1.2. determine the arc of contact.
a. 173.92 deg
b. 183.56 deg
c. 169.87 deg*
d. 212.65 deg
43. A pulley 610 mm in diameter transmits 40 KW at 500 rpm. The arc of contact between the belt
and the pulley is 0.35 and the safe working stress of the belt is 2.1 MPa. Find the tangential
force at the rim of the pulley in Newton.
a. 2406 N
b. 4321 N
c. 2505 N*
d. 3321 N
44. A pulley 610 mm in diameter transmits 40 KW at 500 rpm. The arc of contact between the belt
and pulley is 144 degrees, the coefficient of friction between belt and pulley is 0.35 and the safe
working stress of the belt is 2.1 and the safe working stress of the belt is 2.1 MPa. What is the
effective belt pull in Newton.
a. 2505 N*
b. 3031 N
c. 4528 N
d. 2823 N
45. A 4 inches diameter shaft is driven at 3600 rpm by a 400 Hp motor. The shaft drives a 48 inches
diameter chain sprocket having an output efficiency of 85%. The output force of the driving
sprocket and the output of the driven sprocket are:
a. 200 lb and 250 hp
b. 261.6 lb and 300 hp
c. 291.66 lb and 340 hp*
d. None of the above
46. A certain farm equipment which requires 2200 Newton mater torque at 500 RPM has a diesel
engine to operates at 1500 RPM as its prime mover. A No. 60 roller chain with a total length of
60 pitches and a small sprocket with 23 teeth are to be used with an operating temperature to
remain constant at 45-degree C. Determine the no. of teeth of the larger sprocket.
a. 70 b. 69 c. 68 d. 69*
47. The efficiency of a set of chain driven differential pulley blocks is 35% when lifting a load of
1.89kN. If the large and small pulleys of the compound sheave have 27 teeth respectively, find
the effort required to lift this load.
a. 300N*
b. 200N
c. 400N
d. 500N
48. In a set of rope pulley blocks which has 3 pulleys in the top block and 2 in the bottom, an effort
of 300 N is required to lift a load of 1.26 kN. Find the velocity ratio.
a. 3
b. 4
c. 2
d. 5*
49. There are four pulleys in each block of a set of rope pulley blocks. If the efficiency is 70% when
lifting a load of 2.8 kN, what is the effort applied?
a. 300N
b. 200N
c. 400N
d. 500N*
50. A parallel helical gear set was a 17-tooth pinion driving a 34-tooth gear. The pinion has a righthand helix angle of 30o, a normal pressure angle of 20o, and a normal diametral pitch of 5 teeth/in.
Find the axial circular pitches.
a. 1.2566 inches/tooth*
b. 1.6625 inches/tooth
c. 1.6526 inches/tooth
d. 1.6256 inches/tooth
51. A right-handed single-thread hardened-steel worm has a catalog rating of 2.25 kW at 650 rpm
when meshed with a 48-tooth cast-steel gear. The axial pitch of the worm is 25 mm, normal
pressure angle is 14.5o, and the pitch diameter of the worm is 100 mm. The coefficient of friction
is 0.085. Determine the shafts center distance.
a. 241 mm
*
52.
53.
54.
55.
56.
57.
58.
b. 142 mm
c. 412 mm
d. 124 mm
A 20o straight-tooth bevel pinion having 14 teeth and a diametral pitch of 6 teeth/inch drives a
42-tooth gear. The two shafts are at right angles and in the same plane. Find the pitch angle of
the pinion.
a. 18.4o *
b. 20o
c. 14.5o
d. 20.5o
A triple-thread worm has a lead angle of 17o and a pitch diameter of 2.2802 inches. Find the center
distance when the worm is mated with a wheel of 48 teesth.
a. 6.72 inches*
b. 7.26 inches
c. 6.27 inches
d. 7.62 inches
A double-thread worm has a pitch diameter of 3 inches. The wheel has 20 teeth and a pitch
diameter of 5 inches. Find the gear helix angle.
a. 4.69o
b. 9.46o*
c. 6.49o
d. 6.94o
A 36-tooth pinion turning at 300 rpm drives 120-tooth gear of 14.5o involute full depth pressure
angle. Determine the rpm of the driven gear.
a. 60 rpm
b. 45 rpm
c. 75 rpm
d. 90 rpm*
A parallel helical gear-set consists of a 19-tooth pinion driving a 57-teeth gear. The pinion has a
left-hand helix angle of 20o, a normal pressure angle of 14½o, and a normal diametral pitch of 10
teeth/inch. If the pinion is to transmit 50 Hp at a speed of 1750 rpm. Determine the center
distance of the two gears.
a. 2.02 inches
b. 6.06 inches
c. 4.04 inches*
d. 2.06 inches
Two shafts are connected by spur gears. The pitch radii of the gears A and B are 207 mm and
842 respectively. If the shaft a makes 350 revolutions per minute and is subjected to twisting
moment of 236 N.m what is the tooth pressure of the two gears?
a. 1177 N*
b. 1255 N
c. 890 N
d. 878 N
A machinist made two 8 DP spur gear to be mounted on a center distance of 16 inches with
speed ratio of 7 to 9. The number of teeth in each gear are:
a. 100 teeth and 78 teeth
b. 120 teeth and 93 teeth
c. 144 teeth and 112 teeth*
d. 150 teeth and 117 teeth
59. Two helical gears transmit 500 HP at 3600 rpm. What should be the bore diameter of each gear
be if the allowable stress in gear shafts is 12500 psi?
a. 1.252 in
b. 1.3275 in
c. 1.4568 in
d. 1.5276 in*
60. The pinion shaft of a double reduction geared turbine is 140 mm diameter, runs at 3000 rpm and
the stress in it is 48 MN/m2. The main shaft is 445 mm diameter and runs at 90 rpm. Assuming
that the same power is transmitted by both shafts, find the stress in the main shaft.
a. 50 mpa*
b. 40 mpa
c. 60 mpa
d. 30 mpa
61. An internal gearing requires an idler gear if the driving gear of 6 inches in diameter and the
center distance of the idler to the driver is 20 inches. What is the inside diameter of the driven
gear?
a. 62
b. 70
c. 74*
d. 81
62. In a standard bevel gear, the pinion rotates at 150 rpm, its number of teeth is 14 while the gear
has 42 teeth, what is the pitch angle of the pinion?
a. 18.4 degrees*
b. 20 degrees
c. 14.5 degrees
d. 20.5 degrees
63. Of the following solid shaft diameters, which is the smallest that can be used for the rotox of a 6
HP motor operating at 3500 rpm, if the maximum shear stress for the shaft is 8500 psi?
a. 5/16 in
b. 3/8 in
c. ½ in*
d. 1 in
64. If a shaft 250 mm diameter can safely transmit 1860 kw of power when running at 125 rpm,
calculate the power that can be safely transmittted by a shaft 375 mm diameter when running at
80 rpm, assuming the shafts are of similar material.
a. 4018 kw*
b. 5063 kw
c. 3085 kw
d. 3567 kw
65. A torsion-meter on a tunnel shaft 360 mm diameter registers an angle of twist of 0.3 degree over
a length of 2.5 m when running at 115 rpm. Taking the modulus of rigidity of the shaft material as
93 GN/m2, find the power transmitted.
a. 4.67 mw
b. 3.45 mw
c. 3.89 mw*
d. 5.44 mw
66. A hollow steel shaft 2.54 m long is to be designed to transmit a torque of 33,900 kJ. The shear
modulus of elasticity, G = 82,740 Gpa for steel. The total angle of twist in the length of the shaft
must not exceed 6 deg. And the stress in the shaft must not exceed 110.32 Mpa. What would be
the ratio of the outside diameter to inside diameter?
a. 1.92
b. 1.74
c. 1.56
d. 1.38*
67. A shaft 120 mm diameter is 1.6 m long and its mass is 102 kg concentrated load of 20 kN is hung
at the center of length. Find the maximum stress in the shaft.
a. 32.67 MPa
b. 44.53 MPa
c. 48.32 MPa*
d. 36.45 Mpa
68. Find the twisting moment in a solid shaft 125 mm diameter when the angle of twist is 0.5 degree
on a length of 1.8 m, the modulus of rigidity of the shaft material being 93 GN/m^2
a. 12.9 KNm
b. 11.4 KNm
c. 10.8 KNm*
d. 13.9 KNm
69. A hollow shaft is 400 mm diameter outside and 250 mm diameter inside and transmits a torque
of 480KNm. Calculate the angle of twist over a length of 7.5 m. Take G=92.5 GN/m^2
a. 1.05 deg*
b. 1.66 deg
c. 2.01 deg
d. 2.55 deg
70. What power would a spindle 55mm in diameter transmit at 480rpm. Stress allowed for short
shaft is 59N/mm^2
a. 42.12kW
b. 50.61kW
c. 96.88kW *
d. 39.21kW
71. A 30-m long aluminum bar is subjected to a tensile stress of 172MPa. Find the elongation if
E=69,116MPa.
a. 0.746m
b. 0.007m
c. 6.270mm
d. 7.46cm *
72. A steel wire is 4m long and 2mm in diameter. How much is it elongated by a suspended body of
mass 20kg? Young’s modulus of elasticity for steel is 196,000MPa.
a. 1.123mm
b. 1.385mm
c. 1.374mm
d. 1.274mm *
73. A steel wire is 6m long hanging vertically supports a load of 2000N. Neglecting the weight of the
wire, determine the required diameter if the stress is not to exceed 140MPa and the total
elongation is not to exceed 4mm. E= 200,000MPa
74.
75.
76.
77.
78.
79.
a. 3.4mm
b. 4.4mm *
c. 4.26mm
d. 5.4mm
A copper rolled wire 10m long and 1.5mm diameter when supporting a weight of 350N
elongates 18.6mm. Compute the value of the Young’s modulus of this wire.
a. 200GPa
b. 180.32GPa
c. 148.9GPa
d. 106.48GPa *
A Warwick screw is used to tighten a guy rope. It has right-hand thread of 10 mm pitch at the
top and a left-hand thread of 5 mm pitch at the bottom, and the effective radius of the toggle
bar is 336 mm. Find the velocity.
a. 220.6
b. 130.5
c. 140.8*
d. 210.5
Compute how many 3/8 inch diameter set screws required to transmit 3 Hp at a shaft speed of
1000 rpm. The shaft diameter is 1 inch
a. 1 ½
b. 2*
c. 3
d. 1
A double square thread screw is used to raise a load of 20,000 lb at a velocity of 3 fpm. Outside
diameter of thread and pitch are 2 7/8 in. and 1 in. respectively. Collar friction coefficient is
0.12, thread friction coefficient is 0.10. Mean diameter of collar 5 in. Determine the power
required to drive the screw.
a. 3.45 hp
b. 4.29 hp*
c. 4.65 hp
d. 5.02 hp
Two 2 ¾ in sellers standard square thread screws are used to raise and lower a hydraulic gate
weighing 60 tons. A 570 rpm electric motor operates the screws. The coefficients of collar and
thread friction are 0.03 and 0.14 respectively. The mean diameter of the collar 4in. if the gate
rises at the rate of 2fpm, determine the size of the motor required to lift the gate if the
mechanical efficiency is 85% for the speed reducing equipment.
a. 20 hp
b. 30 hp
c. 34 hp*
d. 24 hp
A single square thread power screw is to raise a load of 70 kN. The screw has a major diameter
of 36 mm and a pitch of 6 mm. The coefficient of thread friction and collar friction are 0.13 and
0.10 respectively. If the collar mean diameter is 90 mm and the screw turns at 60rpm, find the
combined efficiency of screw and collar.
a. 13.438%
b. 15.530%
c. 14.526%
d. 12.526%*
80. Find the horsepower required to drive a power screw lifting a load of 4000 lbs. A 2 and ½ inches
double square thread with two threads/in is to be used. The friction radius of the collar is 2
inches and the coefficients of friction are 0.1 for the threads and 0.15 for the collar. The velocity
of the nut is 10 ft/min.
a. 5.382 HP
b. 4.395 HP*
c. 3.683 HP
d. 6.472 HP
81. What is the working strength of a 2inches bolt which is screwed up tightly in a packed
joint when the allowable working stress is 12,000 psi.
A. 20.4 klb*
B. 22.3 klb
C. 23.4 klb
D. 24.3 klb
82. A single square thread power screw has a lead of 6 mm and mean diameter of 34 mm. It
is used to lift a load of 26 KN and coefficient of friction of thread is 0.15, determine the
torque required to turn the screw.
A. 91.9 N-m*
B. 65.9 N-m
C. 73.6 N-m
D. 86.4 N-m
83. An ACME thread power screw that has a mean diameter of 25 mm and a pitch of 5 mm is
used to lift a load of 500 kg. If friction on threads is 0.1, determine the torque needed to
turn the screw.
A. 10.30 N-m*
C. 13.10 N-m
B. 12.60 N-m
D. 14.20 N-m
84. The torque required to overcome collar friction of a 100 mm mean diameter collar power
screw is 50 N-m and collar friction of 0.15. Determine the weight lifted by the screw.
A. 458.57 kg
B. 478.57 kg
C .487.57 kg
D. 679.57 kg*
85. A cast iron flywheel is rotated at a speed of 1200 rpm and having a mean radius of 1 foot.
If the weight of the rim is 30 lbs, what is the centrifugal force? Use factor C = 41.
A. 14,800 lbs
B. 14,860 lbs
C. 14,804 lbs
D. 14,724 lbs*
86. A 900 mm mean diameter flywheel has a width of 350 mm, 75 mm thick and density of
7100 kg/m3. Neglecting the weight of arm and hub, find the energy released if its speed
changes from 280 rpm to 250 rpm.
A. 7.89 KJ
B. 9.31 KJ*
C. 5.58 KJ
D. 6.71 KJ
87. A flywheel weighing 1000 kg has a radius of gyration of 1.5 m. The normal operating
speed is 160 rpm and coefficient of fluctuation is 0.08, determine the energy released by
the flywheel.
A. 47.1 KJ
B .36.70 KJ
C. 41.70 KJ
D .46.70 KJ*
88. A 5 ft mean diameter flywheel has to absorb 3500 ft-lb of energy and maintain a
coefficient of fluctuation of 0.09. If mean speed is 80 ft/sec, find the weight of flywheel.
A. 190.66 lbs
B. 195.66 lbs*
C. 198.66 lbs
D .200.77 lbs
89. A spring has a rate of 50 lb with a spring index of 8. If stress induced is 90,000 psi,
determine the wire diameter.
A. 0.058 in
B. 0.838 in
C .0.452 in
D. 0.1157 in*
90. Determine the maximum shearing stress of a helical spring composed of 20 turns of 20
mm diameter wire on a mean radius of 80 mm when the spring is supporting a load of 2
KN. G = 83,000 Gpa.
A. 108.10 Mpa
B. 98.61 Mpa
C. 120.60 Mpa*
D. 88.68 Mpa
91. A 0.08” diameter spring has a length of 20 in. If density of spring is 0.282 lb/in3,
determine the mass of spring.
A. 0.0295 lb
B. 0.0283 lb*
C. 0.04851 lb
D. 0.0686 lb
92. A square and ground ends spring has a free length of 250 mm. There are 10 active coils
with wire diameter of 12.5 mm. If the spring rate is 150 KN/m and mean diameter is 100
mm, determine the solid stress.
A. 2,315.54 Mpa*
B. 7,654.81 Mpa
C. 7,842.8 Mpa
D. 8,432.6 Mpa
93. A square and ground ends spring has a pitch of 20 mm, wire diameter of 12.5 mm. If
there are 12 actual number of coils, find the deflection when the spring is compressed to
its solid strength.
A. 78 mm
B. 75 mm*
C. 70 mm
D. 76 mm
94. Find the tooth thickness on tooth circle of a 20 degree full depth involute tooth having a
diametrical pitch of 3, circular pitch of 1.0472 and whole depth of tooth at 0.60.
A. 11.7 mm
B. 13.2 mm*
C. 10.2 mm
D. 7.8 mm
95. A pair of meshing gears has a diametrical pitch of 10, a center distance of 2.6 inches, and
velocity ratio of 1.6. Determine the number of teeth of smaller gear.
A. 10
B. 20*
C. 30
D. 14
96. A spur gear 20 degrees full-depth involute teeth has an outside diameter of 195 mm and a
module of 6.5. Determine the number of teeth.
A. 20.5
B. 25
C. 28*
D. 41
97. The module of a gear having a diametrical pitch of 8 is:
A. 5.233
B. 3.175*
C. 4.23
D. 2.34
98. The diametrical pitch of a gear having a module of 2.3 is:
A. 9
B. 11*
C. 10
D. 12
99. A gear turning 300 rpm has diametrical pitch of 8. If there are 40 teeth on the gear, find
the pitch line velocity of gear.
100.
A. 6.54 fps*
B. 8.31 fps
C. 7.45 fps
D. 9.45 fps
Two gears meshing each other have 18 teeth and 30 teeth. If circular pitch is 0.23
in. Find the center distance between gears.
101.
A. 5.24 in
B. 2.34 in
C. 3.26 in
D. 1.76 in*
A 50 mm diameter shaft supported by two sleeve bearings carries a load of 13.3
MN. The shaft rotates at 150 rpm. If the coefficient of sliding friction between the shaft
and bearings is 0.1, how much power is lost in friction?
102.
A. 261 kw*
B. 640 kw
C. 345 kw
D. 109 kw
A 36 mm shaft uses a sleeve bearing that sustain a load of 4000 N. If the
allowable bearing pressure is 1.3 MN/m2. Find the length of the bearing.
103.
A. 75.47 mm
B. 23.44 mm
C. 89.24 mm
D. 85.47 mm*
For a given belt a manufacturer gives a horsepower rating of 2.5 hp per inch of
width based on a belt speed of 2600 ft/min. The drive is to handle 10 hp and the arc of
contact correction factor is 0.90. Find the width of belt needed. Assume that the belt
widths are available in 1 inch increments.
104.
A. 3.1 in
B. 5.0 in*
C. 4.2 in
D. 6 .0in
A ¼ in round endless belt connects a 1 in diameter pulley with a 2 in pulley;
spacing between pulleys is 4 in on centers. The allowable stress is 400 psi. If the 1 in
pulley is the driver and rotates 100 rpm. How much horsepower can be transmitted?
Assume the coefficient of friction to be 0.30 for each pulley.
105.
A. 0.1230 hp
B. 1.234 hp
C. 0.01151 hp
D. 0.0090 hp*
A 3/8 in flat leather belt is 12 in wide and is used on a 24 in diameter pulley
rotating 600 rpm. The specific weight of the belt is 0.035 lb/in3. The angle of contact is
150°. If the coefficient of friction is 0.3 and the allowable stress is 300 psi how much hp
can it transmit?
A. 34.6 hp
B. 69.5 hp*
C. 78.6 hp
106.
D. 54.4 hp
The band brake of a band brake has 210 degrees of contact with its drum. By
laboratory tests, it is found that the pull on the tight side is 800 lbs and the pull on the
slack side is 285 lb. What is the coefficient of friction?
107.
A. 0.281*
B. 0.756
C. 0.286
D. 0.453
Find the frictional radius for a disc clutch. The disc clutch has an outside diameter
of 10 in and an inside diameter of 6 in.
108.
A. 4.50 in
B. 4.08 in*
C. 5.33 in
D. 8.45 in
In a clutch the outside diameter is 8 in and the inside diameter is 4 in. An axial
force of 400 lb is used to hold the two parts together. If the coefficient of friction of the
mating materials is 0.4, how much torque can the clutch handle?
109.
A. 123.45 in-lb
B. 497.80 in-lb*
C. 213.43 in-lb
D. 563.23 in-lb
A 500 kg block is pulled up a 2 degree incline by a constant force F of 4 KN. The
coefficient of friction between the block and the plane is 0.5. How fast will the block be
moving 10 seconds after the pull is applied?
110.
A. 27.6 m/s*
B. 34.3 m/s
C. 30.5 m/s
D. 38.3 m/s
A flywheel having a moment of inertia of 25 lbs-ft-sec2 is revolving with an
angular velocity of 10 radians per second when a constant torque of 20 lbs-ft is applied to
reverse its direction of rotation. For what length of time must this constant torque act to
stop the flywheel and bring up to reverse speed of 5 radians per second?
A. 12.34 sec
B. 14.34 sec
C. 18.80 sec*
D. 16.34 sec
A weight of 100 lbs. strikes a coil spring from a height of 18 inches and deflects the spring of 6
inches. Find the average force acting on the spring.
a. 600 lbs.
b. 800 lbs.
*c. 400 lbs.
d. 900 lbs.
32. An internal gear has a center distance of 20 in. if the speed of ratio is 3, find the diameter of
internal gear.
a. 28 in.
b. 22 in.
*c. 20 in.
d. 24 in.
33. Find the clearance of a 14.5° involute gear having a module of 2.5.
a. 0.0534 in.
b. 0.0246 in.
*c 0.0154 in.
d. 0.1345 in.
34. A thrust washer has an outside diameter of 0.5 in. and an outside diameter of 3 in. For an
allowable bearing pressure of 90 psi, how much axial load can it sustain?
*a. 628.5 lbs.
b. 537.2 lbs.
c. 702.2 lbs.
d. 871.2 lbs.
35. A square thread screw has an efficiency of 70% when friction of threads is 0.10 and collar
friction is negligible. Determine the lead angle.
a. 12.6°
b. 16.5°
*c. 14.3°
d. 18.3°
36. What is the addendum of a gear having a module of 3?
a. 0.234 in.
b. 0.198 in.
c. 0.345 in.
*d. 0.118
37. Find the distance between centers of a pair of gears, one of which has 12 teeth and the other
37 teeth. The diametral pitch is 7.
a. 3.0 in.
*b. 3.5 in.
c. 4.0 in.
d. 4.5 in.
38. An air cylinder has a bore of 25 mm and is operated with shop air at a pressure of 90 psi.
Find the push force exerted by the piston rod in N.
a. 127 N
b. 70 N
c. 402 N
*d. 305 N
39. A 10 inches diameter gear is use to transmit 20 KW at 900 rpm. Determine the tangential
force on each gear.
a. 1.761 KN
*b. 1.671 KN
c. 1.842 KN
d. 2.614 KN
40. Determine the permissible working stress of a UNC bolt that has a stress area of
in2 if material used is carbon steel.
*a. 4055.5 psi
b. 5244.5 psi
c. 4675.5 psi
0.606
d. 4186.5 psi
41. Compute the working strength of 1 ½ in. bolt which is screwed up tightly in packed joint
when the allowable working stress is 13,000 psi.
a. 11,465.5 lbs.
b. 13,860.5 lbs.
*c. 11,212.5 lbs.
d. 11,854.5 lbs.
42. A line shaft is to transmit 200 hp. At 900 rpm. Find the diameter of the shaft.
a. 2.18 in.
*b. 2.28 in.
c. 3.18 in.
d. 3.28 in.
43. A steel shaft has an angular deflection of 5°. The shaft torque is 2.5 KN.m. If theshaft length
is 20 times the shaft diameter, find the shaft diameter.
a. 32.17 mm.
*b. 41.17 mm.
c. 87.56 mm.
d. 56.34 mm.
44. A 12 ft. length steel line shaft has no bending action except its own weight. What power in
hp. Can the shaft deliver at a speed of 2000 rpm, consider a torsional deflection of 0.08°/ ft.
length.
*a. 25.95
b. 12.34
c. 17.34
d. 98.23
45. Find the angular acceleration of the shaft whose speed changes from 0 to 2500 rpm in 5
seconds.
a. 23.47 rad/sec.
b. 34.23 rad/ sec.
*c. 52.36 rad/sec.
d. 65.34 rad/sec.
46. A main transmitting shaft transmits 350 KW to drive a generator at 2500 rpm, what is the
required diameter of the shaft?
a. 58.5 mm.
*b. 62.7 mm.
c. 65.3 mm
d. 56.2 mm
47. The total force of 125 KN is required for a flange coupling that has 5 bolts has also a
shearing stress of 30 Mpa for bolt. Determine the required bolt diameter.
a. 62.54 mm.
b. 54.21 mm.
c. 45.62 mm.
*d. 32.57 mm.
48. A hollow steel shaft 80 mm. outside diameter and 60 mm. inside diameter is designed to
deliver 80 KW power at 450 rpm. Find the torsional deflection per meter length.
*a. 0.426°
b. 0.328°
c. 0.583°
d. 0.755°
49. A flange bolt coupling has 10 steel 25.4 mm diameter bolts evenly tighten around a 415 mm
bolt circle. Determine the torque capacity of the connection if the allowable stress in the bolt is
50 MN/m2.
a. 59.95 KN.m
*b. 52.6 KN.m
c. 46.15 KN.m
d. 43.8 KN.m
50. A round steel shaft rotates at 200 rpm and is subjected to a torque of 275 N.m and a bedding
moment of 415 N.m. Determine the equivalent twisting moment.
a. 597.84 N.m
b. 456.42 N.m
c. 546.43 N.m
*d. 497.85 N.m
51. A steel rod 30 mm. and 800 mm. long has an allowable elongation not exceed 1.5 mm. find
the allowable load in KN.
*a. 274
b. 248
c. 316
d. 236
52. A 4 inches shaft using a flat key, whose width is 1 inch is transmitting a torque of 63,000
in.lb, if the designed shearing stress is 5000 psi, determine the safe length of key.
*a. 6.3 inches
b. 5.3 inches
c. 4.3 inches
d. 7.0 inches
53. A 1200 mm. cast iron pulley is fastened to 112.5 mm. shaft by means of 28.13 mm square
key 175 mm long. The key and the shaft have a shearing stress of 14,000 psi. Determine the
force of a pulley that will shear the key.
*a. 10,015 lbs.
b. 11,005 lbs.
c. 11,050 lbs.
d. 10,501 lbs.
54. A 3/8 inch flat belt is 12 inches wide and is used on 24 inches diameter pulley rotating at 600
rpm. The specific weight of belt is 0.035 lb/in3 .The angle of contact is 150 degrees. If the
coefficient of friction is 0.3 and stress is 300 psi, how much power can it deliver?
a. 65.4 hp.
*b. 69.9 hp.
c. 60.5 hp.
d. 63.5 hp.
55. A 75 mm diameter shaft is transmitting 300 KW at 300 rpm. A flange coupling is used and
has 6 bolts, each 18 mm in diameter if the bolts circle based on an average shearing stress of 27.5
Mpa.
*a. 227.4 m.
b. 477.2 mm.
c. 274.7 mm.
d. 247.4 mm.
56. A belt connected pulleys has 10 cm. diameter 30 cm. diameter. If the center distance is 50
cm. determine the angle of contact of smaller pulley.
a. 152 deg.
b. 154 deg.
*c. 157 deg.
d. 159 deg.
57. A compressor is driven by an 18 KW motor by means of V-belt. The service factor is 1.4 and
the corrected horsepower capacity of V-belt is 3.5. Determine the number of belts needed.
a. 4
b. 6
c. 8
*d. 10
58. A bearing whose shaft rotates at 500 rpm, has a friction loss of 15 KW. The bearing load is
30 KN and friction of 0.14. Find the bearing diameter.
*a. 136.42 mm.
b. 146.42 mm.
c. 156.42 mm.
d. 166.42 mm.
59. A heavy-duty shaft coupling is to be secured with 25 mm. bolts at a distance of 150 mm from
the shaft center. The shaft transmits 4,330 KW of power at a speed of 1200 rpm. If the allowable
shearing stress for the bolts is 100 Mpa, how many bolts are required?
a. 3 bolts
b. 6 bolts
*c. 5 bolts
d. 4 bolts
60. Find the started distance between sprocket having 4 in. and 16 in. diameters.
*a 18 in.
b. 20 in.
c. 22 in.
d. 24 in.
61. A flat belt is 6 inches wide and 1/3 inch thick and transmits 15 hp. The center distance is 8 ft.
the driving pulley is 6 inches in diameter and rotates at 2000 rpm such that the loose side of the
belt is on top. The driven pulley is 18 inches in diameter. The belt material is 0.035 lb/in3 and the
coefficient of friction is 0.30. Determine the net tension.
a. 167.56 lb.
*b. 157.56 lb.
c. 156.75 lb.
d. 175. 56 lb.
62. An 18 teeth sprocket driving with 98 teeth sprocket at a center distance of 34 pitches. Find
the chain length in pitches.
*a. 131
b. 136
c. 140
d. 142
63. A sprocket with 8 in. diameter and ¾ in. drives another sprocket at standard center distance
of 48 pitches. Find the diameter of larger sprocket.
a. 30 in.
*b. 32 in.
c. 34 in.
d. 36 in.
64. The ratio of band tension in a band brake is 4. If angle contact is 260 degrees, determine the
coefficient of friction.
a. 0.10
b. 0.25
c. 0.35
*d. 0.30
65. Two pulleys, 80 cm. apart carry a belt in an open belt connection. If the diameters of the
pulleys are 40 cm. and 15 cm. What is the length of the belt needed?
*a. 248.35 cm.
b. 348.35 cm.
c. 265.45 cm.
d. 305.35 cm.
66. A band brake has an angle contact of 280 degrees and is to sustain a torque of 10,000 in.lbs.
The band bears against a cast iron drum of 14 in. diameter. The coefficient of friction is 0.30.
Find the tension at the tight side.
a. 6,501.50 lbs.
b. 7,501.50 lbs.
c. 3,501.50 lbs.
*d. 1857.57 lbs.
67. The angle of contact of a band clutch is 250 degrees. The cross-section of the band is
1/16
in. x 1.5 in. The design stress for the band material is 8,000 psi. If the drum is 16 inch in
diameter and rotates at 350 rpm, what is the power capacity of the clutch if f = 0.40.
a. 20.50 hp.
b. 24.50 hp.
*c. 27.50 hp.
d. 30.50 hp.
68. A simple disc clutch has an outside diameter of 200 mm. and inside diameter of 100 mm.
The friction is 0.40 and applied load is 1,500 N. Find the torque transmitted using uniform
pressure.
a. 26.67 N.m
b. 26.67 N.m
c. 36.67 N.m
*d. 46.67 N.m
69. A pulley 600 mm. in diameter transmits 40 KW at 500 rpm. The arc of contact between the
belt and pulley is 144°, the coefficient of friction between belt and pulley is 0.15 and the safe
working stress of the belt is 2.1 Mpa. Determine the belt tension ratio neglecting the effect of
centrifugal force.
a. 2.41
b. 2.44
*c. 1.458
d. 4.12
70. A drop hammer of 2 tons dead weight capacity is propelled downward by a 16 in. diameter
cylinder at 120 psi air pressure, what is the impact velocity if the stroke is 35 inches?
a. 63.2 fps.
b. 31.6 fps.
*c. 36.34 fps.
d. 47.4 fps.
71. A 5-ton weight is lowered at a constant acceleration of 4 ft. /s2. What is the cable stress?
a. 12,344.44 lb.
b. 9,344.56 lb.
c. 11,751.55 lb.
*d. 8757.76 lb.
72. What is the polar moment of inertia of a 4 in. solid shaft?
a. 25.13 in3
b. 12.57 in4
c. 12.57 in3
*d. 25.13 in4
73. Find the section modulus of shaft having 2.5 in. diameter.
*a. 3.07 in.
b. 4.56 in.
c. 5.45 in.
d. 8.46 in.
74. A 2 in. diameter steel shaft is used to transmit 2 KN.m torque with 2 m. length. Find the
torsional deflection of the shaft in degrees.
a. 3.23°
b. 6.34°
c. 5.34°
*d. 4.425°
75. Find the polar moment of inertia of a hollow shaft 50 mm. inner diameter and wall thickness
of 10 mm.
*a. 1.74 x 10-6 m4
b. 5.55 x 10-7 m4
c. 8.55 x 10-6 m4
d. 4.23 x 10 -6 m4
76. A hollow shaft a torque of 3.4 KN.m at a shearing stress of 55 Mpa. The outside diameter is
1.25 times that of the inside diameter. Find the inside diameter in mm.
*a. 64.87
b. 46.87
c. 84.67
d. 74.64
77. A 3-in diameter solid shaft is desired to replace a hallow shaft having 4” outside diameter.
Consider he strength to be the same, determine the inside diameter of hallow shaft.
a. 2.5 in.
*b. 3.5 in.
c. 3.0 in.
d. 4.0 in.
78. A flange coupling having 180 mm bolt circle and 19 mm thick uses 8 bolts, 16 mm diameter
to connect two shafts. It is use to transmit 60 KW at 180 rpm. Determine the factor of safety in
compression if yield point in compression is 448 Mpa.
a. 15.6
*b. 30.8
c. 18.5
d. 25.4
79. A flat key is to be designed for 75 mm diameter shaft which will transmit 15 KW at 400 rpm.
If allowable shearing stress is 200 Mpa and the key width is 15 mm, determine the length of key.
a. 30.65 mm.
b. 33.75 mm.
*c. 31.83 mm.
d. 32.85 mm.
80. It is specified that the angular deformation in a shaft should not exceed 1 degree in length of
1.8 m. The allowable shearing stress is 83 Mpa. Determine the diameter of the shaft. The
material has G = 77 x 10 6 pa.
*a. 222.34 mm.
b. 234.22 mm.
c. 23.42 cm.
d. 24.22 cm.
A piston reciprocates 100 times per minute (single stroke). The length of the stroke is 6 in.
What is the average wristpin velocity in ft/min?
A. 50 ft/min*
B. 100 ft/min
C. 75 ft/min
D. 125 ft/min
82. A workpiece turning at 300 rpm has a tangential speed of 15 ft/s. Find the diameter of the
workpiece.
A. 11.46 in *
B. 15.23 in
C. 13.23 in
D. 17.34 in
83. A workpiece turning at 20 rad/sec has diameter of 4 in. Find the peripheral speed of
workpiece.
A. 1.23 fps
B. 3.33 fps *
C. 5.23 fps D. 7.34 fps
84. Two plates 4 ft x 8 ft plate ½ in thick is to be joined lengthwise. A welding machine to be
used has a welding rate of 20 in/min. How long will it take to join the plates?
A. 7.34 min
B. 1.23 min
C. 4.80 min * D. 6.45 min
85. A 10 ft long seam can be weld in 10 min. the welding rate is:
A.
8
in/min
B. 12 in/min* C. 10 in/min
86. Determine the time in seconds, to saw a rectangular magnesium bar 5 in wide and 2 in
thick if the length of cut is 5 in. The power hacksaw does 120 strokes/min and the
feed/stroke is 0.127 mm.
A. 189
B. 500*
C. 99
D. 20
87. In an Oxy-Acetylene manual welding method, to weld a 3 ½ ft long seam in a 0.375”
thick steel plate at a consumption rate of 9 ft 3/ft for oxygen and 7 ft3/ft for acetylene.
Compute for the total combined gas consumption in ft3.
A.
B.
C.
D.
189
500
99*
20
88. Compute for the drill penetration in in/min when a drill turns at 1200 rpm and the feed
of 0.005 in/rev. Material is steel.
A. 1.8
B. 3.6
C. 12
D. 6*
89. What is the value in degrees of 1 radian?
A. 57.490
B. 57.940
C. 57.290*
D. 57.920
90. Compute the manual cutting time in minutes, of steel plate 4 ft by 8 ft by 2.5 cm thick
with a hand cutting speed of 3.8 to 4 mm/sec, cutting lengthwise
A. 10*
B. 1.81
C. 0.38
D. 8.16
91. Compute the cutting speed in fpm of a workpiece with 2 inches diameter and turning at
100 rpm.
A. 72
B. 102
C. 62
D. 52*
92. Determine the average time to cut by automatic oxyacetylene (machine) crosswise a 4 ft x
8 ft x 4 in thick steel plate.
A. 6.85
B. 318*
C. 10
D. 360
93. Calculate the rpm for machining a cast iron workpiece 6 inches in diameter. The lowest
cutting speed for cast iron is 50 fpm.
A. 35.3
B. 43.3
C. 33.3*
D. 53.32
94. With the arc welding rate of 18 in/min, how long will it take to weld ½ in thick plate by 3
feet long seam?
A. 3 min
B. 1.5 min
C. 2 min*
D. 4 min
95. How long will it take to mill a ¾” by 2” long keyway in a 3” diameter shafting with a 24
tooth cutter turning at 100 rpm and a 0.005” feed/tooth?
A. 0.136 min
B. 0.166 min*
C. 0.196 min
D. 0.106 min
96. How long will it take to saw a rectangular piece of aluminum plate 8 in wide and 1 ½ in
thick if the length of the cut is 8 in, the power hacksaw makes 120 rev/min and average feed
per stroke is 0.0060 in?
A. 13.11
B. 14.01
C. 11.11*
D. 12.03
97. A grinding wheel rotates 1750 rpm and has a surface speed of 2290 ft/min. Find the
diameter of the wheel in inches.
A. 3 in B. 5 in*
C. 4 in
D. 9 in.
98. A horizontal cantilever beam, 16 ft long is subjected to a load of 500 lb located to its
center. The dimension of the beam is 2 x 4 inches respectively. w = 100 lb/ft, find its flexular
stress.
A. 3150 psi*
B. 2912 psi
C. 4510 psi
D. 5663 psi
1. What power would a short shaft, 50 mm in diameter, transmit at 400 rpm?
A. 50 kw
B. 60 kw*
C. 45 kw
D. 65 kw
2. Surface hardening to produce a hard outer surface with a ductile interior is desirable for
metal (steel) products subjected to
A. High tensile loads
B. Shock
C. Fatigue*
D. High compressive loads
3. Which of the following is the only allotropic alloy of steel?
A. Aluminum alloys
B. Magnesium
C. Copper alloys
D. Iron-carbon alloys*
4. All of the following are processes used to surface harden steel except
A. Carburizing
B. Flame hardening
C. Cyaniding
D. Tempering*
5. All of the following are examples of ceramics except
A. Brick
B. Portland cement
C. Paraffin*
D. Refractories
6. If the oscillatory motion of a body about an equilibrium point is reduced by friction, the
motion is known as
A. Forced vibration
B. Natural (free) vibration
C. Damped vibration*
D. Undamped vibration
7. All of the following are examples of external forces on a rigid body except
A. Gravity
B. Electrostatics
C. Magnetic forces
D. Van der Waal’s forces*
8. The natural logarithm of the ratio of the amplitude of two successive underdamped free
oscillations is known as the
A. Free logarithm
B. Logarithmic mean difference
C. Natural logarithm
D. Logarithmic decrement*
9. All of the following shapes can lead to stress concentrations except
A. Stepped shafts
B. Plates with holes
B. Gently tapered parts with large fillets and radii*
C. Shafts and keyways
10. Stress concentration factors are not normally applied to any of the following
configurations except
A. Static loading of ductile materials
B. Applications with local yielding around discontinuities
C. Applications where stresses are kept low by design
D. Long grooves where the ratio of groove radius to shaft diameter is small*
11. The mechanism used to enlarge or reduce moments for reproducing drawings to different
scales is called
A. Clinograph
B. Trisquare
C. Graphometer
D. Bantograph*
12. In Vicker’s hardness testing, the pyramid indentor apex is
A. 40 deg*
B. 162 deg
C. 186 deg
D. 122 deg
13. Before drilling a hole in a piece of metal, it should be
A. Marked with chalk
B. Center-punched*
C. Scribed
D. Protracted
14. After a piece of pipe has been cut, the hole is cleaned out with a
A. Pipe reamer*
B. Pipe cleaner
C. Pipe taper
D. Hole cleaner
15. When preparing to tap a hole for a pipe fitting the size of the drill will be
A. Larger than the tap size*
B. Smaller than the tap size
C. Equal to the size of the tap
D. None of the above
16. Before installing a new flange gasket make sure that the All of the following are alloys
of nickel except
A. K-monel
B. Inconel-X
C. Chromium molybdenum steel*
D. Nickel
17. When pouring Babbitt, it
A. Can be poured in several pourings
B. Must be poured all at one time*
C. Can be done at intervals
D. Must be done in cool place
18. If a drill speed is too great, it will
A. Cut faster
B. Lose its temper*
C. Cut slower
D. Not cut
19. If the cutting edges of a drill are cut at different angles
A. The drill will not cut
B. The hole will be larger than the drill*
C. The hole will be smaller than the drill
D. None of the above
20. A hard solder is made of
A. Copper and Zinc*
C. Tin and copper
B. Tin and zinc
D. Tin and lead
21. When facing off a piece of metal in the lathe chuck, the tool bit must be set
A. Above center
C. Below center
B. At the center*
D. Off center
. A flywheel on a press rotating at 120 rpm is slowed to 102 rpm during a punching process that
requires ¾ sec for the punching portion of the cycle. What angular deceleration the flywheel
experience?
A. -2.52 rad/s2* B. -5.45 rad/s2 C. -1.23 rad/s2 D. -8.45 rad/s2
81. A 100 lb body is being hoisted by a winch, the tension in the hoisting cable being kept constant
at 110 lb. At what rate the body is accelerated?
A. 1.22 ft/s2
B. 3.22 ft/s2*
C. 2.22 ft/s2
D. 4.44 ft/s2
82. A body of mass 50 kg is being hoisted by a winch, and the tension in the cable is 600 N. What is
the acceleration?
A. 4.23 m/s2
B. 5.23 m/s2
C. 3.23 m/s2
D. 2.19 m/s2*
83. A flywheel has a diameter of 3 ft and weighs 1000 pounds. What torque must be applied,
neglecting bearing friction, to accelerate the flywheel at the rate of 100 revolutions per minute,
per second?
A. 265.8 ft-lbs
B. 565.80 ft-lbs
C. 365.80 ft-lbs *
D. 534.98 ft-lbs
84. A 12 inch cube of steel weighing 490 lbs is being moved on a horizontal conveyor belt at a speed
of 6 miles per hour (8.8 ft/s). What is the kinetic energy of the cube?
A. 323.45 ft-lbs
B. 489.22 ft-lbs*
C. 534.34 ft-lbs
D. 633.34 ft-lbs
85. If a cube of mass 200 kg is being moved on a conveyor belt at a speed of 3 m/s, what is the
kinetic energy of the cube?
A. 800 J
B. 900 J
C. 850 J
D. 950 J*
86. A pile driver weighing 200 pounds strikes the top of the pile after being fallen from a height of 20
ft.If forces a pile into the ground a distance of ½ foot. What is the average force of the blow?
A. 8,200 lbs*
B. 8,600 lbs
C. 8,400 lbs
D. 8,800 lbs
86. A pile driver of mass 100 kilograms falls 10 meters and moves the pile a distance of 0.3 m. What is
the average force of the blow?
A. 23.45 KN
B. 33.68 KN* C. 54.23 KN
D. 43.23 KN
87. A 1000 lb block is pulled up a 2-degree incline by a cable exerting a constant force F of 600 lbs. If
the coefficient of friction between the block and the plane is 0.5, how fast will the block be moving
up the plane 10 seconds after the pull is applied?
A. 12.4 mph
B. 10.2 mph
C. 17.3 mph
D. 14.3 mph*
88. A casting weighing 300 lbs is to be lifted by means of an overhead crane. The casting is lifted 10 ft
in 12 seconds. What is the horsepower developed?
A. 0.45 hp*
B. 8.5 hp
C. 6.5 hp
D. 9.5 hp
89. A casting of mass of 150 kg is lifted 4 meters in 15 seconds by means of a crane. What is the
power?
A. 392 watts*
B. 523 watts
C. 456 watts
D. 634 watts
90. A cast iron flywheel with a mean rim radius of 9 inches, is rotated at a speed of 800 rpm. If
the weight of the rim is 20 lbs, what is the centrifugal force?
A. 3169.34 lbs
B. 3262.34 lbs C. 3269.34 lbs *
D. 4269.34 lbs
91. A steel pulley with a mean rim radius of 120 mm is rotated at a speed of 1100 rpm. If the mass of
the rim is 5 kilograms, what is the centrifugal force?
A. 5344.50 N
B. 7961.50 N* C. 6432.30 N
D. 8734.56 N
92. An oxyacetylene cutter is use to cut a 4 ft x 8 ft steel plate crosswise and divided the whole plate
into five equal parts. If the cutting rate is 10 in per minute, how long will it take to cut plates?
A.
B.
C.
D.
19.20 min*
13.45 min
21.23 min
17.34 min
93. Using oxyacetylene welding method to weld a 10 ft long seam in a ½ in thick plate at a consumption
rate of 10 ft3/ft oxygen and 8 ft3/ft for acetylene. What is the total gas consumption?
A. 150 ft3
B. 170 ft3
C. 160 ft3
D. 180 ft3*
94. A 24 ft2 lateral surface for a cylindrical tank is to be made by joining 2 ft by 2 ft steel plate to form
6 ft x 4 ft. The consumption rate for both oxygen and nitrogen is 20 ft 3/ft using oxyacetylene
welding method. Find total gas consumption needed, ft3?
A. 250 ft3
B. 470 ft3
C. 440 ft3
D. 280 ft3*
95. A 10 ft x 20 ft plate is to be divided into 8 pieces 5 ft x 5 ft steel plate by means of an oxyacetylene
cutter that has a cutting rate of 10 in per minute. How long will it takes to do the job?
A. 50 min
B. 70 min
C. 60 min*
D. 80 min
96. How long will it take to mill ½“by 1.5“long keyway by means of 25 teeth cutter turning at 120
rpm and 0.008” feed/tooth.
A.1.3 sec
B. 6.34 sec
C. 4.23 sec
D. 3.75 sec*
97. A 5 in long keyway is to be mill at the rate of 0.2 in/min. How long will it take to mill the keyway?
A. 20 sec
B. 15 sec
C. 25 sec*
D. 30 sec
98. How long will it take to cut a rectangular plate 4 ft wide by means of a saw that has a speed of
160 rev/min and an average feed per stroke of 0.009 in?
A. 22.22 min
B. 33.33 min* C. 55.55 min
D. 44.44 min
99. A 4 ft wide x 8 ft long and ½ in thick steel plate is be cut into 4 equal parts crosswise. If cutting
rate is 0.02 in/stroke and saw speed is 110 rpm, how long will it take to do the job?
A. 53.45 min
B. 34.23 min
C. 65.45 min
D. 67.45 min
100. A seam can be weld in 3 min. If the welding rate is 15 in/min, find the length of the seam.
A. 20 in* B. 30 in
C. 25 in
D. 45 in
. What is the recommended allowable tensile stress for A 325 ASTM grade bolt?
a. 121 MPa*
b. 69 MPa
c. 85 MPa
d. 151 MPa
82. What is the recommended deflection limits due to torsion of machine part of moderate
precision in degrees per inch?
a. 0.000021 to 0.0002
b. 0.0001 to 0.002
c. 0.00002 to 0.0004*
d. 0.0001 to 0.004
83. What type of self – threading screw has machine screw diameter – pitch combinations with
threads approximately unified form and with blunt tampered points?
a. Type B
b. Type O
c. Type AB*
d. Type A
84. Based on ANSI standard head type for tapping and metallic drive screws, which of the
following bearing surface?
a. Countersunk head b. Truss head c. Pan head
d. Fillister head*
85. Hardened ground machine dowel pins are furnished in two diameter series, namely the
standard series and the oversize series. The oversize series have basic diameter _____ inch over
the nominal diameter.
a. 0.001*
b. 0.002
c. 0.0002
d. 0.00002
86. What is the required pressure angle in gearing where the maximum strength and wear
resistance are desired?
a. 20 degrees
b. 28 degrees
c. 25 degrees*
d. 35 degrees
87. What is the desired pressure angle in cases where consideration of angular position or
backlash is critical and both pinion and gear contain relatively large number of teeth?
a. 15.5 degrees
b. 14.5 degrees*
c. 17.5 degrees
d. 13.5 degrees
88. Which is not an advantage of enlarged center – distance system for enlarged pinions?
a. The pinion tooth is made stronger by enlargement
b. Pinions having fewer than 18 teeth may engage other pinions in the range
c. Only the pinions need be changed from the standard dimensions
d. Slightly greater contact ratio is obtained*
89. Which is not a disadvantage of Standard Centered – Distance system for enlarge pinion?
a. The contact ration is slightly smaller*
b. The gear as well as the pinion must be changed from standard dimensions
c. Pinions have fewer than the minimum number of teeth
d. In most cases where gear trains include idler gears, the standard centered – distance
system cannot be used
90. Statement that a given body is in static equilibrium means that the body cannot:
A. be acted upon by any other force
C. undergo any displacement
B. have any acceleration
D. have any type of motion*
91. The phenomenon of continuous stretching under load even if stress is less than the yield
point.
A. elasticity
B. creep*
C. ductility
D. plasticity
92. Clearance to a new boiler installation to the existing or old plant building should follow a
minimum clearance of ______ between top of the boiler proper and the ceiling as stated in
the PSME Code.
A. 2100 mm(max)
B. 1000 mm(max)
C. 2130 mm(max)* D. 2140mm(max)
93. What type of gear is used for high-speed operation?
A. worm
B. bevel
C. spur
D. helical*
94. V-belts operate efficiently at speed of about (fpm)
A. 4500*
B. 4400
C. 3500
D. 4200
95. It is advised that in rubber belts application / mounting, it should have an initial tension of
_____ in/ply.
A. 10
B. 12-15
C. 18-24
D. 15-20*
96. Machining properties of steel can be improved by adding:
A. sulfur, lead, phosphorous*
C. vanadium, aluminum
B. chromium, nickel
D. silicon, aluminum, titanium
97. The process of removing the edge of the work piece to allow the easy entrance of the toolbit
in the lathe:
A. Reaming
B. Chamfering*
C. Tampering
D. Parting
98. Which of the following is not part of the bed of a lathe machine?
A. Saddle*
B. Base
C. Bed ways
D. Chip pond
99. The precise method of centering a work piece in the lathe machine is:
A. Dial indicator method*
B. Toolbit method
C. Wiggler method
D. Surface gage method
100. A heat treatment process whereby a certain degree of hardness is sacrificed in order to
reduce brittleness and increase the toughness of a steel tool:
A. Normalizing
B. Annealing
C. Quenching
D. Tempering*
1. In the process of electro slag welding, theoretically there no upper limit to the ______.
a. thickness of weld bead*
c. rate of metal deposit
b. rate of slag consumption
d. slag both temperature
2. Spot welding is used for:
a. rough and irregular surfaces
b. thin metal sheets*
3. In argon arc welding, argon is used as:
a. flux
b. source of heat
c. thick surfaces
d. coating only
c. agent for heat transfer
d. shield to protect the work from oxidation*
4. Plain and butt welds may be used on materials up to thickness of nearly ______ mm.
a. 4 mm
b. 40 mm
c. 25mm*
d.20 mm
5. In welding joints, poor fusion is due to which of the following:
a. Improper Current*
b. High welding speed
6. The major disadvantage of carbon arc welding is that
a. Separate filler rod is needed
b. Bore electrodes are necessary
c. Uncleaned metal surface
d. Lack of Flux
c. There is occurrence of blow holes*
d. Electrode are consumed fast
7. High temperature metals like columbium can easily be welded by ______ welding
a. TIG
b.MIT
c. Flash
d. Electron Beam*
8. Welding is not done directly from the supply mains because:
a. its voltage is too high
c. it is customary to use welding
machines
b. its voltage keeps fluctuating
d. it is impracticable to draw heavy
currents
9. Chemical blackening is a finishing technique that produces black oxide coating on the machines
surfaces of ferrous materials. This process can be carried out of room temperature in about how
many minutes?
a. 30 minutes
b. 21 minutes
c. 15 minutes*
d. 25 minutes
10. A metal coating process known as detonation or D – gun process is essentially a water cooled
barrel several feet long and about how many inches in diameter?
a. 1.5 inches
b. 1 inch*
c. 0.4 inch
d. 2 inches
11. What is the weakness of coated carbide cutting tool material?
a. Poor wear resistance
c. Low shock resistance
b. High cost
d. Limited to moderate speed*
12. Which basic category if cutting tool material is typically used for finishing operations on irons,
steels, stainless steels and aluminum alloys?
a. Cermet *
b. Coated Carbide
c. Carbide
d. Polycrystalline diamond
13. What is the advantage of using carbide as cutting tool material?
a. High strength b. High hot hardness c. High shock resistance * d. High speed
capabilities
14. Of the cutting tool materials below, which is the most expensive?
a. Ceramic whisker
c. Cubic boron – nitride*
b. Ceramic silicon – nitride
d. Polycrystalline diamond
15. Which of the following reamers is best used when considerable metal must be removed and the
finish is not critical?
a. Jobbers reamer
b. Rose chucking reamer*
c. Expansion chucking reamer
d. Shell reamer
16. Open – end wrenches are made _____ mm oversize to permit them to easily slip on bolt heads
and nuts of specified wrench size.
a. a.0.25
b. 0.13*
c. 0.16
d. 0.21
17. Which of the methods by which tapers can be turned on a lathe has the disadvantage of limited
taper length?
a. Reamer Method
c. Compound method*
b. Offset tailstock method
d. Taper attachment method
18. Which of the following methods by which tapers can be turned on a lathe is considered the best
method?
a. Taper attachment method*
c. Tool bit method
b. Offset tailstock method
d. Reamer method
19. What type of blade is usually used for mild tos tough production and cut off applications?
a. Standard Carbon
b. Dart
c. Demon
d. Imperial
bimetal*
20. What is the recommended band pitches to saw material thickness of 1 to 3 inches?
a. 10 or 14
b. 6 or 8*
c. 4 to 6
d. 2 or 3