Shikshan Prasarak Mandal’s
S.P.M. POLYTECHNIC, KUMATHE
Preliminary Question Paper
Course Name: Mechanical Engineering
Subject: Manufacturing Processes
Time: 3 Hour
17402
Course Code: ME
Semester: Fourth
Max Marks: 100
Instructions:
1) All questions are compulsory.
2) Illustrate your answers with suitable sketches wherever necessary.
3) Figures to the right indicate full marks.
4) Assume suitable additional data if necessary.
5) Preferably, write the answers in sequential order.
Q.1 A) Answer any SIX of the following:
12 Marks
1) What is pattern?
2) What is drilling?
3) Why defects occur in casting?
4) Why gating system is provided on mould?
5) What is function of fly wheel in mechanical press?
6) What is bending in case of press operations?
7) What is upset forging?
8) Draw neat sketch of Three Roll rolling mill.
Q.1 B) Answer any TWO of the following:
08 Marks
1) Draw a neat & labeled sketch of twist drill.
2) State any four operations which can be performed on drilling machine. Describe any one.
3) Write types of plastics. State two properties of each.
Q.2 Answer any FOUR of the following:
16 Marks
1) Draw a neat sketch of blanking operation and describe it in brief.
2) Compare notching operation with lancing operation.
3) State four types of dies. Describe any one in brief with neat sketch.
4) State four pattern making allowances? Describe shrinkage allowance in brief.
5) What is core? What is importance of core in moulding process?
Q.3 Answer any FOUR of the following:
16 Marks
1) Describe forward extrusion process with neat sketch.
2) State any four advantages of metal pattern over wooden pattern
3) Compare hot rolling with cold rolling process.
4) What is tool signature of single point cutting tool? Give one example.
5) State any four welding defects and give remedies for any two.
6) Draw a neat sketch of radial drilling machine and name its parts.
Q.4 Attempt any FOUR of the following:
16 Marks
1) Compare open die and closed die forging process.
2) Draw a neat sketch of two roll mill and describe its working.
3) State four functions of flux used in brazing.
4) Draw a neat sketch of standard twist drill with nomenclature.
5) State the effects of rake angle and clearance angle of cutting tool on turning process.
6) What are basic types of plastics? Give two applications of each.
Q.5 Attempt any FOUR of the following:
16 Marks
1) Describe rolling principle with sketch.
2) Compare direct and indirect extrusion process.
3) Describe drawing operation in press with sketch.
4) State functions of i) Die block and ii) Guide of die set
5) Describe pit moulding process in brief. State its two applications.
6) State causes and remedies of following casting defects & explain any two.
Q.6 Attempt any TWO of the following:
16 Marks
1) Describe with neat sketch Electron beam welding process. State its two applications
2) What is injection moulding? Draw a neat sketch of it. Write it’s any four applications in
industry.
3) Enlist various operations on lathe m/c. Explain with sketch cutting tool nomenclature of single
point cutting tool.
S.P.M. POLYTECHNIC, KUMATHE
Preliminary Question Paper
`
Course Name: Mechanical Engineering
Subject: Fluid Mechanics & Machinery
Time: 3 Hrs.
17411
Semester: Fourth
Marks: 100
Instructions:
(1) All Questions are compulsory.
(2) Illustrate your Answers with neat sketches.
(3) Figure to the right indicates full marks.
(4) Assume suitable data if necessary.
Q.1 (a) Attempt any SIX of the following.
12 Marks
1) Convert 3.5 bars pressure into equivalent mercury coloum.
2) State hydraulic function of casing which is used for centrifugal pump.
3) Define the term impact of jet.
4) Classify Turbines according to direction of flow.
5) Define steady flow with one example.
6) Define Total Pressure and Centre of pressure
7) How pressure can be expressed in two ways? Sate its SI unit.
8) State the function of nozzle in pelton turbine.
Q.1 (b) Attempt any Two of the following.
08 Mark
1) Determine the specific gravity of fluid having viscosity 0.05 poise and kinematic
Viscosity as 0.035 stokes.
2) Explain Bourdons tube pressure gauge with neat sketch.
3) Write the construction and working of Pitot tube.
Q.2 Attempt any FOUR of the following
16 Marks
1) Draw a neat Sketch for impact of jet on a moving vertical flat plate and write the
Formula to determine the work done with the meaning of each term.
2) A venturimeter has an area ratio of 9:1.The larger dia. being 300mm.During the flow, the recorded
pressure in the large is 6.5 m and at the throat is 4.25 m.If the meter coefficient C=0.99.Calculate the
discharge through the meter.
3) Draw neat and labeled indicator diagram considering the effect of acceleration and friction in suction
and Delivery pipes in case of single acting reciprocating pump.
4) Practically it is not possible to keep outlet angle of bucket of pelton turbine equal to zero. State the
reason and draw the velocity triangle for this situation.
5) State differences between reciprocating pump and centrifugal pump. (Any four)
6) An Equilateral triangular plate of base 3m and altitude 3m is immersed vertically in an oil of specific
gravity 0.8. Determine total pressure and depth of center of pressure of plate.
Q.3 Attempt any FOUR of the following.
16 Marks
1) A close tank contains 0.5 m Hg and 1.5 m water, 2m of oil of specific gravity0.8 and air space
above the oil, if the pressure at the bottom of tank is 30 N/cm2 gauge. What should be the reading of
the at the top of the tank?
2) Distinguish between impulse turbine and reaction turbine on the basis of principle of working,
pressure head, discharge and application.
3) List the major and minor losses in a flow through pipe. Give appropriate formula.
4) A multistory building is 380m above the street. If the pressure of 170 Kpa is required in a water
pipeline at the top of the building. What is the pressure at the basement of a building 9m below the
street?
5) Draw a neat sketch of venturimeter. State why the length of divergent cone is made longer.
6) Describe the working of Double acting reciprocating pump with neat labeled sketch.
Q.4 Attempt any TWO of the following.
16 Marks
1)Water at a head of 300 m is supplied to a pipe of diameter 40 cm and length 4m.
Assume f = 0.009. Calculate the following.
i. Power transmitted when velocity is 1.5 m/s.
ii. Maximum power transmitted.
iii. Power transmitted when velocity is 3.2 m/s.
iv. Draw the graph power transmitted v/s velocity.
2) The difference in water surface levels in two tanks, which are connected by three pipes in series of
length 300mm, 150mm, 20mm and of dia.30cm,20cm,40cm respectively is 15m.Find the rate of flow
in lit/s if coefficient of friction are .005,0.0052,0.0048 respectively neglecting minor losses.
3) State any three troubles and their remedies commonly experienced during operation of centrifugal
pump.
Q.5 Attempt any TWO of the following.
16 Marks
1) A 5m long tapered pipe is inclined at an angle of 15° with horizontal. Diameter of the pipe at top end
is 0.24 m and that at bottom end is 0.08 m. find the pressure difference between the two ends if the
velocity of water at bottom end is 2 m/s.
2) A centrifugal pump pump delivers 30lps of water to a height of 18 m through a pipe 90 m long and
10mm in dia.If the overall efficiency of the pump is 75%, find power required to drive the pump. Take
f=0.012
3) With the help of neat sketch explain the working and construction of Kaplan turbine.
Q.6 Attempt any TWO of the following.
16 Marks
1) An Orifice meter with orifice diameter 15 cm is inserted in a pipe of 30cm diameter. The pressure
Gauge fitted upstream and downstream of the orifice meter gives readings of 14.715 N/cm2 and 9.81
N/cm2 respectively. Find the rate of flow of water through the pipe in liters / sec. Take Cd = 0.6
2) a) State the name of turbine you will select for.
*High speed and minimum discharge. *Minimum discharge and high head
*Moderate discharge and head
*Max.discharge and low head
b) A pelton wheel having semicircular buckets is 1m in dia.Pressure head at nozzle when it is closed
15 bars. The discharge when nozzle is open is 3.5 m3/s.If the speed is 600 r.p.m. calculate power
developed and hydraulic efficiency. Take CV=0.98, overall efficiency = 85%
3) State the procedure for drawing the inlet and outlet velocity triangles for moving curved vanes with
meaning of each notation.
Shikshan Prasarak Mandal’s
S.P.M. POLYTECHNIC, KUMATHE
Preliminary Question Paper
Course Name: Mechanical Engineering
Subject: Thermal Engineering
Time: 3 Hour
17410
Course Code: ME
Semester: Fourth
Max Marks: 100
Instructions:
1) All questions are compulsory.
2) Illustrate your answers with suitable sketches wherever necessary.
3) Figures to the right indicate full marks.
4) Assume suitable additional data if necessary.
5) Preferably, write the answers in sequential order.
Q.1 A) Answer any SIX of the following:
12 Marks
a) State Stefan Boltzman law.
b) State charle’s law
c) Define the term “Degree of Superheat”
d) Define Dryness Fraction of steam.
e) State Dalton’s law of partial pressure.
f) State Stefan Fourier’s law of heat conduction.
g) Define a Black body used in heat transfer
h) State Zeroth law of thermodynamics
Q.1 B) Answer any TWO of the following:
08 Marks
a) Write Steady state equation & apply it to Condenser, Compressor & Boiler.
b) State the sources of air leakage in condensers & effect of air leakage in condenser.
c) Define a thermodynamic system. Differentiate between open system and closed
System with example of each.
Q.2 Answer any FOUR of the following:
16 Marks
a) Compare induced & forced Drought.
b) A heat exchanger is to be selected for pasteurization of milk. What material &
Which type of heat exchanger should be selected? Justify your answer
c) State characteristic gas equation & give units of each term in equation’.
. d) Describe the working principle of economizer with neat sketch.
e) Give the classification of steam turbine.
f) One kg of gas at 1.2 bar and 50C having 1 m3volume is heated at const. pressure till
its volume becomes 1.8m3. Calculate the work done and change in internal energy
.
Volume becomes 1.8m3. Calculate the work done and change in internal energy
Assume Cp=1.1KJ/KgK
Q.3 Answer any FOUR of the following:
16 Marks
a) Explain the terms (i) Absorptivity (ii) Transmivity & discuss their importance
b) A composite wall is formed of 2cm copper plate, 3mm layer of asbestos & 4.5 cm
Fiber glass. the wall (From surface to surface) is subjected to temperature
Difference of 500C. Considering heat flow in one direction, from surface to surface
Calculate heat flow per m2 area of wall
,.
Take conducting values as follows
K copper = 370W/moC, K asbestos=150W/moC, K fiber glass= 74W/moC
c) Draw a neat sketch diagram of Loeffler boiler. Show the path of blue gases. Discuss
the importance of this boiler.
d) Represent ideal gas process on PV & TS diagram.
1. Adiabatic process 2. Isobaric process 3. Isothermal process
e) Give the classification of boiler.
f) What is regenerative feed heating? Name the different methods of regenerative
feed heating.
Q.4 Attempt any FOUR of the following:
16 Marks
a) Prove the equivalence of Kelvin-Planck and clausius statement.
b) What is boiler drought? Why it is necessary?
c) Compare Jet & surface condensers on the basis of construction, performance &
application.
d) Prove that (C.O.P.) Heat pump = (C.O.P.) Ref. + 1.
e) What is heat Transfer? State different modes of heat transfer.
f) What is dryness fraction? Explain its significance.
Q.5 Attempt any TWO of the following:
16 Marks
a) State the two statements of second law of thermodynamics
b) Explain the function of cooling tower in steam power plant.
c) Derive an expression for Heat flow through composite wall.
Q.6 Attempt any TWO of the following:
16 Marks
a) Explain Rankine cycle with P-V. And T-S diagram.
b) What is compounding of steam turbines? Explain different methods of
Compounding. Explain any one method.
c) Explain construction and working of shell & tube type heat exchanger.
Shikshan Prasarak Mandal’s
S.P.M. POLYTECHNIC, KUMATHE
Preliminary Question Paper
Course Name: Mechanical Engineering
Subject: Theory of Machine
Time: 3 Hour
17412
Course Code: ME
Semester: Fourth
Max Marks: 100
Instructions:
1) All questions are compulsory.
2) Illustrate your answers with suitable sketches wherever necessary.
3) Figures to the right indicate full marks.
4) Assume suitable additional data if necessary.
5) Preferably, write the answers in sequential order.
Q1- A) Attempt any Three
Define kinematic link and kinematic chain.
List down different types of brake and dynamometer.
List different follower motion.
List the advantage of the chain drive.
State the classification of the governor.
State the relationship between liner and angular velocity and acceleration.
What are the conditions under which uniform wear theory is adopted for design
and analysis of clutch and bearing.
8) Why balancing of machine part is needed in modern machine.
B) Attempt any Two
1) Explain with neat sketch working of Ackerman’s steering gear mechanism.
2) Explain with neat sketch Reverted gear train. State its application.
3) State function of clutch. State it’s principle of working
Q2) Attempt any Four
(12 Marks)
1)
2)
3)
4)
5)
6)
7)
(8 Marks)
(16 Marks)
1)
2)
3)
4)
Draw a neat sketch of crank and slotted lever quick return mechanism and explain its working.
Distinguish between machine and structure.
State the formulae for calculating i) Velocity and ii) Acceleration of Piston using analytical method.
Explain the Klein’s construction to determine velocity and acceleration of a link in a I.C. Engine
mechanism.
5) Classify cam and follower.
6) A flat belt is required to transmit 35 kW from a pulley of 1.5 m effective diameter running at speed of
300 rpm. The angle of contact is spread over 11/24th of the circumference. Coefficient of friction for
the surface is 0.3. Determine the maximum tension in the belt.
Q3) Attempt any Four
(16 Marks)
1) State law of Gearing. Define - i) Module ii)Addendum In a given four bar chain PQRS, length of
different links are as follows. l(P,Q)=80mm, l(Q,R)=60mm, l(R,S) = 72mm and l(P,S)=100mm. Link
PS is fixed and crank PQ rotates at 25rad/sec, in the clockwise direction. Determine Velocity of point
R graphically by using Relative velocity method if Crank PQ makes angle of 600 with the horizontal.
Draw the configuration diagram also.
2) Define following terms relating to Governor :
i) Stability ii) Sensitiveness iii)Isochronisms
iv) Hunting
3) Draw Cam terminology and label the minimum four terms.
4) Describe the procedure for balancing of several masses revolving in same plane by graphical method.
5) Draw a neat labeled sketch of single plate clutch and state its working.
6) Difference between flywheel and governor.
Q4) Attempt any Four
(16 Marks)
1) Define the terms coefficient of fluctuation of energy and coefficient of fluctuation of speed, in the case
of flywheels.
2) Find the diameter of driven pulley rotating at 500 rpm if the driver pulley is 250mm in diameter and
rotates at 100 rpm by using a flat belt drive with 5% slip and the belt thickness is 5mm.
3) Explain in brief with a sketch scotch Yoke mechanism
4) State the principle of operation of a rope brake dynamometer with a neat sketch.
5) Draw a labeled sketch of Wilson governor.
6) Four masses m1, m2, m3 and m4 are 200 kg, 300 kg, 240 kg, and 260 kg respectively. The
corresponding radius of rotation are 0.2 m, 0.15 m, 0.25 m and 0.3 m respectively, and the angle of
masses are 45°, 120° and 255° from m1. Find the position and magnitude of the balance mass required,
if its radii of rotation is 0.2 m. Solve Graphically.
Q5) Attempt any Two
(16 Marks)
1) PQRS is a four bar chain with link PS fixed. The length of the link are PQ = 62.5 mm; QR = 175 mm;
RS = 112.5 mm; and PS = 200 mm. The crank PQ rotates at 10 rad/sec clockwise. Draw the velocity
and acceleration diagram when angle QPS = 60° and Q and R lie on the same side of PS. Find angular
velocity and angular acceleration of link QR.
2) A cam rotating clockwise with a uniform speed is to give the roller follower of 20 mm diameter with
the following motion :
(i) Follower to move outwards through a distance of 30 mm during 120° of cam rotation ;
(ii) Follower to dwell for 60° of cam rotation ; (iii) Follower to return to its initial position during 90°
of cam rotation ; and (iv) Follower to dwell for the remaining 90° of cam rotation. The minimum
radius of the cam is 45 mm and the displacement of the follower is to take place with simple harmonic
motion on both the outward and return strokes. Draw the cam profile.
3) The ratio between tensions on tight side and slack side of belt is 2.1; the belt is running at 16 m/s. The
safe stress in belt material is not to exceed 250 N/cm2. Determine width of belt to transmit 8 KW.
Density of belt material 1 gm/cm3 and 1 cm thick.
Q6) Attempt any Two
(16 Marks)
1) i) Explain the types of gear trains with the help of neat sketch.
ii) Differentiate between flywheel and governor.
2) A flat foot step bearing 225 mm in diameter supports a load of 7500 N. If the coefficient of friction is
0.09 and the shaft rotates at 600 r.p.m. Calculate the power lost in friction.
3) A band brake acts on the 3/4th of circumference of a drum of 400 mm diameter which is keyed to the
shaft. The band brake provides a braking torque of 200 N- m. One end of the hand is attached to a
fulcrum pin of the lever and the other end to a pin 100 mm from the fulcrum. If the operating
force is applied at 600 mm from the fulcrum and the coefficient of friction is 0.25, find the
operating force when the drum rotates in a i) Clockwise direction ii)Anticlockwise direction.
S.P.M. POLYTECHNIC, KUMATHE.
17404
Preliminary Question Paper
Course Name : Mechanical Engineering Group
Semester
: Fourth
Academic Year : 2013-2014
Max Marks : 100
Subject
: Electrical Engineering
Duration
Course Code
: ME
: 3 Hour
Instructions:
1. All questions are compulsory.
2. Illustrate your answer with neat sketches wherever necessary.
2. Figures to the right indicate full marks.
3. Assume Suitable data if necessary.
Q.1 Attempt any TEN of the following.
20 Marks
a. Define generating station and state its type.
b. State the principle of MI type instrument.
c. Why ammeter is connected in series with circuit? Justify.
d. Draw torque speed characteristics of D.C series and shunt motor.
e. What is a transformer? State the types of transformer on the basis of construction.
f. Why transformer core is laminated? Give the reason.
g. What factors determines the direction of rotation of three phase induction motor?
h. State the necessity of enclosure to an electric drive
i. State the methods of power factor improvement.
j. State any two applications of squirrel cage induction motor.
k. What is universal motor? State any two applications of it.
l. What are safety tools used in electrical installation.
Q.2 Attempt any Four of the following.
a. Compare star connected load with delta connected load on any four points.
b. Describe with neat layout diagram of typical AC supply system.
c. What is impedance? What is its unit? On what factors it depends.
d. Draw circuit diagram, waveforms and phasor diagram in pure resistive circuit.
Comment the phase relationship between voltage and current.
e. What is phase sequence? State its practical importance.
f. Draw a neat labeled diagram of PMMC type instrument and state its
principle of operation.
16 Marks
Q.3 Attempt any FOUR of the following.
16 Marks
a. Draw constructional diagram of a DC motor and label the various parts of it.
b. Define with respect to transformer i) transformation ratio ii) step up transformer
iii) voltage ratio iv) ideal transformer.
c. Compare auto transformer with two winding transformer on the basis of
construction, size, efficiency and application.
d. A voltage equation is expressed as v = 141.42 sin 314t is connected across
20Ω resistance. Find i) current equation ii) draw waveform.
e. A coil consist of 10Ω resistance is connected across 230V, 50Hz supply.
Calculate i) impedance of coil ii) power factor iii) current iv) active power.
f. A 10KVA, 2000/200V, 50Hz single phase transformer has 300 turns on the
primary. Determine i) secondary no. of turns ii) maximum flux in the core.
Q.4 Attempt any FOUR of the following.
16 Marks
a. Describe with neat sketch the working principle of a transformer.
b. Suggest suitable single phase induction motor for following applications.
i) table fan ii) water pump iii) hair dryer iv) mixer.
c. Draw neat labeled diagram of star delta starter used for three phase induction
motor.
d. List the applications of electrical machines in electro agro system..
e. Describe the working of AC servo motor with neat sketch.
f. What are the reasons having stationary armature winding in case of alternator.
Q.5 Attempt any FOUR of the following.
16 Marks
a. Describe the working of three phase induction motor.
b. Compare a squirrel cage induction motor with a slip ring induction motor on any
four points.
c. Describe indirect resistance heating method with suitable diagram.
d. A three phase two pole, 50Hz induction motor runs at 2900rpm. Determine
i) synchronous speed ii) percentage slip.
e. Describe with a neat diagram, any one method of resistance welding.
f. Whar are the safety precautions to be taken while working on electrical installation.
Q.6 Attempt any FOUR of the following.
a. Draw wiring diagram to control two lamps, one socket, one fan with regulator
and fuse.
b. State the possible causes for three phase induction motor.
i) motor becomes hot ii) motor runs too fast.
c. Describe the method of dielectric heating.
d. State the necessity of energy conservation and audit.
e. Compare group drive and individual drive system on any four points.
f. Describe the procedure to carry the process of electroplating and state any two
applications of it.
16 Marks