Questions Banks>>>>>>>>>>>>>>Examples: (Q & A) Fe-Fe3C PHASE DIGRAM
QUESTION
ANSWER
1. The eutectoid steel in Fe-C diagram has an austenite phase of composition 0.8%C Just
below 1140C. (a) True
(b) False
2. The pearlite structure obtained in the eutectoid steel in Fe-C diagram contains 88% Fe3C
& 12% ferrite at room Temperature. (a) True
(b) False
3. The 0.5%C steel contains less than 0.02%C in it’s Ferrite At 750ºC. (a) True
(b)
False
4. Upon cooling the eutectoid steel in Fe-C diagram from 1550ºC, the composition of the last
trace of liquid phase at the end solidification temperature is 1.6 %C (a) True
(b) False
5. The normalizing temperature in ºC of a hypoeutectoid steel having 88% Pearlite at
room temperature is 1100ºC :- (a) True
(b) False
6. When the hypoeutectoid steel is heated to the normalizing temperature, the structure
obtained is Pearlite +Fe3C
a) True
(b) False
7.The number of phases of alloy containing 0.2%C after equilibrium cooling to room
temperature is two phases:- a) True
(b) False
8.The amount of phases of alloy contains 0.2% C after equilibrium cooling to room
temperature is 90% ferrite+ 10% austenite :
a) True
(b) False
9.The number of phases of alloy contains 0.4%C after equilibrium cooling to room
temperature is One phase : a) True
(b) False
10. The amount of phases of alloy contains 0.4% C after equilibrium cooling to room
temperature is 94%austenite + 6% ferrite:
a) True
(b) False
11. The number of phases of alloy containing 0.8%C after equilibrium cooling to room
temperature is Two phases: a) True
(b) False
12. The amount of phases of alloy contains 0.8% C after equilibrium cooling to room
temperature is 88% austenite + 12%ferrite: a) True
(b) False
13. The stricture of the alloy containing 0.8% C after quenching would contain 100% pearlite
: a) True
(b) False
14. The upper critical temperature of the alloy containing 0.4%C is 723ºC: a) True
(b)
False
15. The upper critical temperature of the alloy containing 0.8%C is 723ºC: a) True
(b) False
16. The upper critical temperature of the alloy containing 1.2%C is 723ºC : a) True
(b) False
17. The Fe-Fe3 C phase diagram is used to estimate Phases & microstructures and
Solidification sequence of Iron and steels. a) True
(b) False
A
18.The eutectic alloy on the Fe-Fe 3 C Diagram contains 4.3%C
a) True
(b)
A
False
19.The pearlite structure obtained in the eutectoid steel in Fe-C diagram contains 88%
Fe3C & 12% ferrite at room temperature. a) True
(b) False
B
20. The structure of 0.5%C steel contains Ferrite and Austenite at 750C. a) True
(b) False
21.The structure of 0.5%C steel contains two phases …… at room temperature (a)
Ferrite & Pearlite
(b) Ferrite and Austenite
(c) Ferrite & Cementite
(d)
Both (a) & (d)
22.The structure of 0.5%C steel consists of:(a) 88% Fe3C & 12% ferrite
(b) 22% Fe3C & 78% ferrite
(c) 22% ferrite &
78% Fe3C
(d) 92.5%ferrite &7.5% Fe 3C
At room temperature after annealing.
23. The structure of the steel contains 0.5%C consists of (After water quenching to room
temperature)
(a) 88% Fe3C & 12% ferrite (b) 37.5% pearlite and 62.5% martensite
(c) 100% martensite
(d) None of the above.
24.Upon cooling the eutectoid steel in Fe-C diagram from
1550 oC, it first transforms to:- (a) Liquid + ferrite
(b) Liquid +austenite
(c) Ferrite +
CORRECT
B
2%C
B
12%Fe3C &
88% ferrite
--------
A
A
-----------B
B
773ºC
Austenite
A
B
-----------97% ferrite +
3% Fe3C
Two
B
B
A
B
94% ferrite +
6% Fe3C
---------
B
88% ferrite +
12% Fe3C
100%martensite
B
817ºC
A
-----------
B
910ºC
---------------------------------12%Fe3C &
88% ferrite
A
--------------
C
M
D
D
C
E
austenite
(d) Austenite
25.Themicrostructure of hypo-eutectoid steel containing 0.2%C consists of :(a) 90% pearlite and 10% ferrite
(b) 75% Pearlite and 25% ferrite
(c) 75% ferrite and 25% pearlite
(d) 100% ferrite
At room temperature
26.The upper critical temperature of a steel containing 0.4% C is:(a) 7230 C (b) 7500 C (c) 8170 C (d) 9100 C
27.The structure of the alloy containing 0.8%C at 750 0 C consists of :(a)100% Ferrite (b) 100% Austenite
(c) 50% Ferrite + 50% Austenite
(d)
100% Pearlite
28.Martensite has a structure of :(a) BCC
(b)FCC (c) BCT
(d) HCP.
29.Normalizing is usually carried out to:- (a) Harden the steel
(b) Soften the steel
(c) Homogenize the properties (d) Both a&c
30. The phases present in the alloy contains 0.4%C after equilibrium cooling to room
temperature are:-(a) Austenite & ferrite
(b) Austenite &Fe 3C (c) Ferrite & Fe3C
(d) Ferrite & martensite
31. The phases present in the alloy contains 0.8%C after equilibrium cooling to room
temperature are:-(a) Austenite & ferrite
(b) Austenite &Fe 3C (c) Ferrite & Fe3C
(d) Ferrite & martensite
32. The phases present in the alloy contains 1.2%C after equilibrium cooling to room
temperature are:- (a) Austenite & ferrite
(b) Austenite &Fe 3C (c) Ferrite & Fe3C
(d) Ferrite & martensite
33. The amount of phases present in the alloy contains 0.4%C after equilibrium cooling to
room temperature is :- (a) 94% martensite & 6% ferrite (b) 94% ferrite& 6% Fe 3C
(c) 94% austenite & 6% ferrite
(d) 94% Fe3C & 6% ferrite
34. The amount of phases present in the alloy contains 0.8%C after equilibrium cooling to
room temperature is :- (a) 60% martensite& 40% ferrite (b) 88% ferrite& 12% Fe 3C
(c)80% austenite & 20% ferrite
(d) 94% Fe 3C & 6% ferrite
35. The amount of phases present in the alloy contains 1.2%C after equilibrium cooling to
room temperature is :- (a) 94% martensite & 6% ferrite (b) 82% ferrite& 18% Fe 3C
(c) 80% austenite & 20% ferrite
(d) 82 Fe 3C & 18% ferrite
B
M
C
D
C
M
B
M
C
M
D
M
C
M
C
C
M
M
B
D
B
D
B
D
Questions Banks>>>>>>>>>>Examples: (Q&A) HEAT TREATMENT
QUESTION
1. Annealing is usually performed to:- (a) Decrease hardness. (b) Increase ductility.
(c) Relieve stresses. (d) All of the above.
2.Tempering optimizes mechanical properties as it:(a) Increases tensile strength and hardness (b) Increases ductility and toughness. (c)
Decreases tensile strength and hardness. (d) Both b & c.
3. Hardening and tempering produce optimum strength and toughness for:- (a) Steels of
carbon content higher than 0.2%.
(b) Al alloys. (c) Cu alloys.
(d) All of the above.
4.Normalizing of steels is:- (a) Heating to ferrite followed by air cooling.
(b) Heating
to austenite followed by water cooling. (c) Heating to austenite followed by air
cooling.
(d) Heating to austenite followed by furnace cooling
5.None-equilibrium cooling of Fe-C alloys by quenching yields a range of
microstructure and mechanical properties such as martensite having:(a) High hardness and low toughness.
(b) Low hardness and high toughness. (c) Low
ANSWER
DIFFICULTY
D
M
D
A
M
M
C
M
A
M
strength and high ductility.
(d) Optimum combination of strength and hardness.
6.Full annealing of steels is: (a) Heating to ferrite followed by air cooling.
(b)
Heating to austenite followed by water cooling. (c) Heating to austenite followed by air
cooling. (d) Heating to austenite followed by furnace cooling.
7.As the carbon content changes from 0.2 to 0.8%, the upper critical temperature:(a) Increases
(b) Decreases
(c) Remains the same
(d) critical temperature does not depend on carbon content
8.The effect of alloying elements on steel like Cr, Mo V, Ti, Si, etc. on heat treatment
respond is:- (a)No effect
(b) To increase hardenability
(c) Make heat treatment with no effect
(d) To decrease hardenability
9. We use the Fe-Fe3C diagram to predict the microstructure of steels: (a)Under
equilibrium cooling conditions (b) Under all cooling conditions (c) At high
temperatures (d) After quenching
10. Equilibrium cooling of Fe-C alloys by slow cooling to room temperature yields a
microstructure of:- (a)Ferrite and pearlite.
(b)Austenite and pearlite.
(c)Ferrite and Cementite. (d) Both b and c.
11. Tempering optimizes mechanical properties and it usually follows:(a) Annealing.
(b) Quenching. (c) Normalizing. (d) Both (b) and (c).
12.The number of phases present in an alloy containing 0.4 % carbon, after equilibrium
cooling to room temperature are:(a) 2 phases called ferrite and cementite
(b) 2 phases called ferrite and pearlite (c) 2
phases called ferrite and austenite (d) None of the above
13.The structure of the alloy containing 0.8%C be after quenching in water consists of :(a)Ferrite and pearlite (b) Ferrite and cementite (c) Martensite (d) None of the above
14.The upper critical temperature for the alloys containing 0.8C is:(a) 850º C (b) 900º C
(c) 773º C
(d) None of the above.
15. The normalizing temperature in oC of a hypoeutectoid steel having 88% Pearlite at
room temp. is :(a) 773ºC
(b) 960ºC
(c) 793ºC
(d) 910ºC
16.Steels Quenching is : (a) Heating to ferrite followed by rapid cooling.
(b) Heating
to austenite followed by rapid cooling. (c) Heating to pearlite followed by rapid cooling.
(d) All of the above
15. Quenching can be done in:
(a)Water
(b)Oil
(c) Air
(d)All of the above
16. precipitation hardening is a
heat treatment given to Al alloys to increase their:(a) Ductility (b) strength
(c) toughness
(d) corrosion resistance
17.Martensite is an unstable phase that appears due to non-equilibrium cooling
conditions in ferrous alloys and it is
(a) Of BCT structure (b) Of BCC structure
(c) Of FCC structure (d) Of HCP structure
18.Martensite is an unstable phase that appears due to non-equilibrium cooling
conditions in ferrous alloys and it is:(a)Hard and brittle (b) Hard and tough (c) Malleable (d) (a) & (c)
19. Non-equilibrium cooling conditions could be achieved in industrial conditions by:(a) Fast cooling
(b) Slow cooling (c) Can not be achieved in industry. (d) None of
the above
19. Tempering of martensite makes it:(a) More brittle
(b) Tougher (c) Harder
(d) Of higher UTS .
20.Tempering is usually carried out by heating the steel to:- (a) Above 7230 C
(b)Below 7 23ºC (c) Above 9100 C (d) Below 910 0 C.
21. Fine grain sizes are promoted by certain manufacturing conditions such as:(a) High cooling rates (b) High amounts of deformation
(c) Certain alloying elements (d) All of the above
22. Fine grain size results in:(a) Higher strengths (b) Lower strength (c) High melting points
(d) Higher electrical conductivity
D
M
B
M
B
M
A
E
C
M
B
A
E
E
C
M
C
D
A
M
B
M
D
M
B
M
A
M
A
M
A
E
B
M
B
M
D
M
A
M
23. Quenching is usually carried out to:(a) Harden the steel ( b) Soften the steel (c) Homogenize the properties
(d) Relief stresses
24.The most important heat treatment given to aluminum alloys is called:(a) Annealing
(b) Tempering
(c) Precipitation hardening
(d) Normalizing
A
E
C
E
A
E
D
D
25.The most important aluminum alloy is:(a) Al-Si alloy
(b) Al-Cu alloy
(c) Al-Ti alloy
(d) Al-Zn alloy which used in manufacturing of pistons
26. The normalizing temperature in 0 C of a hypoeutectoid steel having 75% Pearlite at
room temperature Is:(a) 773
(b) 1100-1250 (c) Above1410 (d) 850-900
27. Full annealing of steels corresponds to:(a) Equilibrium cooling
(b) Non-equilibrium cooling
(c) Air cooling
(d) Water cooling
28. Annealing made to highly alloyed castings should usually be conducted by cooling
the parts in:(a) Furnace
(b) Air
(c) Water
(d)Oil
29. The normalizing temperature of eutectoid steel is:(a) 700ºC
(b) 773ºC
(c) 850ºC
(d) 910ºC
30.The tempering temperature for most steels must be below:- (a) 850ºc
(b)800ºc
(c)723ºc
(d)910ºc
31. When the hypoeutectoid steel is heated to the quenching temperature, this
temperature must ensure that the steel enters the region of :- (a) Austenite phase (b)
Ferrite (c) Pearlite (d)Fe3C.
32.Parts are furnace annealed to decrease their :- (a)-Brittleness & hardness
(b)Ductility
(c)Toughness
(d)None of the above
A
E
A
E
B
M
C
M
A
E
A
E
Answer
Difficulty
Questions Banks>>>>>>>>>>>Examples: (Q& A) COMPOSITE MATERIALS
Question
1. A composite material is a mixture of two components usually:(a) Soluble
(b) Non-soluble in each other
(c) Chemically bonded (d) None of the above
2. One of the components of the composite material forms the matrix while the other present
as particles or fibers provides:(a) The strength or hardness required. (b) The bonding required. (c) The toughness
required
d) The ductility required .
3. Ceramic materials:- (a) Consist of organic long molecular chains or networks.
(b) Can be crystalline, non-crystalline, or mixture of both.
(c) May contain non-metallic elements.
(d) Both (b) & (c).
4. Polymeric materials:- (a) Consist of organic long molecular chains or networks.
(b) Can be crystalline, non-crystalline, or mixture of both.
(c) Are inorganic substances composed of one or more metallic elements. (d) Both A&b
5. Boron nitride is a ceramic material used in:(a) Insulator (b) Lubricant
(c) Electronic devices
(d) Cutting tools
6. Ceramics are classified into microstructural terms:(a)Single crystals like porcelain pottery and glassy filaments like E-glass for glass
reinforced Polymers.
(b) Single crystals like ruby laser crystals and glassy
filaments like sheets of float glass. (c) Single crystals like ruby laser crystals and
glassy filaments like E-glass for glass reinforced Polymers. (d) Polycrystalline
aggregates bonded by a glassy matrix like Sheets of float glass.
7. Ceramics are:-
B
E
A
E
D
E
D
E
A
M
C
D
(a)Electrically conducting and exhibit low thermal conductivity
(b)Heat resistant and exhibit low thermal conductivity
(c)Totally elastic and have low melting points (d)Both (a) & (c)
8.The fusion process in the production of ceramics is:(a) Forging
(b) Firing
(c) Sintering
(d) Glazing
9.Composites are generally formed by
(a) Suspending reinforcing fibers in binding matrix
(b) By melting fibers and matrix with each other
(c) By chemical bonding of fibers and matrix
(d) None of the above
10.In composites:(a)The matrix holds the fibers together in a structural unit.
(b)The matrix protects the fibers from external damage and transfers the applied loads to the
fibers. (c) Both (a) & (b)
(d)None of the above
11.Most polymers:(a) Are organic materials that contain molecules composed of hydrogen, oxygen and carbon.
(b) Are organic materials that contain molecules composed of hydrogen, oxygen and sulphur.
(c) Are organic materials that contain molecules composed of titanium, hydrogen and
sulphur
(d) None of the above.
12. Thermoplastic polymers exhibit:(a) Plastic and ductile properties (b) Can be
formed at elevated temperature (c) Can be cooled remelted and reformed (d) All of
the above.
13. Fiber glass reinforced plastic is among the materials known as:(a) Metallic
materials
(b) Ceramic materials
(c) Composite materials
(d) Polymers.
14.Ceramics are inorganic materials that consist of metallic and non-metallic elements
chemically bonded together and they are usually:(a)Electrically non- conducting
(b)Heat resistant
(c)Hard
(d)All of the above.
15.Tungsten carbide used for
manufacturing:(a) Insulator (b) Lubricant (c) Electronic device (d) Cutting tools
16.Tungsten carbide is a:(a) Metallic material
(b) Ceramic material
(c) Polymer
(d) Composite
17.Thermosetting polymers have a strong primary bond and are often formed by:- (a)
Polymerization
(b) Condensation
(c) Crystallization
(d) Solidification
18.Thermoplastic polymers are often formed by:(a) Polymerization
(b) Condensation
(c) Crystallization
(d) Solidification
19. Polymers are a group of materials characterized by chains of molecules made up of
smaller units called:- (a) Crystals (b) Grains (c) Monomers.
(d) None of the above
B
E
C
M
A
M
C
M
A
M
D
M
C
E
D
M
D
E
B
E
C
M
D
M
C
20.Ceramics are fired at elevated temperatures to provide fusion and cause chemical
reactions in the material that produce the desired properties, this fusion process is
called:- (a) Annealing
(b) Sintering (c) Hardening
(d) Glazing.
21.Carbides are:(a)Ceramics
( b) Composites
(c) Polymers
(d) Metals
22.Carbides are a ceramic material used in applications required: (a) Heat resistance (b) High strength (c) High ductility and toughness (d) Both a&b
23.Among the applications of ceramics: pottery, brick, tile, glass, ovenware, and
refractories, due to their high resistance to :- (a)Heat
(b)Deformation
(c)
Electricity (d) All of the above
24. Some polymers have strong primary bonds, often formed by condensation
Polymerization and those are called:- (a)Thermosetting polymers (b)Thermoplastic
Polymers (c) Both a&b (d) None of the above
Questions Banks>>>>>>>>>>>>>>>Examples: (Q & A) MECHNICAL TESTING
M
B
A
M
E
D
E
D
E
A
M
QUESTION
1. The maximum force required to fracture in tension a bar of unit cross sectional area is
known as:- (a)Yield strength. (b) Ultimate tensile strength. (c) Fracture stress
(d) Shear stress
2. Young's Modulus is a measure of the……… of the material in tension.
(a)
Elasticity
(b) Stiffness
(c) Toughness
d) Plasticity
3. A direct measure of ductility from the tension test is the (a) Strain. (b) Percentage
elongation.
(c) Yield strength
(d) UTS
4. The resistance of a surface to abrasion or indentation is known as
(a) Tensile strength. (b) Creep strength. (c) Ductility. (d) Hardness.
5. The offset yield stress is (a)The greatest stress the material can withstand without any
permanent strain on unloading.
(b) The stress required to produce a
small amount of plastic deformation = 0.002 (c)The maximum stress the material can
withstand. (d) None of the above.
6. Strength properties of material are designated by (a) UTS
(b)
Yield stress
(c) Toughness
(d) Both a & b
7. The property measured by loading a specimen from behind the notch by the impact of
heavy Swinging pendulum is the (a) Tensile strength.
(b) Fatigue strength. (c)
Impact Toughness.
(d) Creep strength.
8. A proper selection of a material suitable for applications subjected to impact loads
should be based on the property of (a) Impact toughness. (b) Hardness.
(c)
Ductility.
(d) Toughness.
9. The impact test is used to measure the amount of energy absorbed for fracture under
(a) Sudden impact.
(b) Slow loading conditions. (c) High temperature.
(d) Changing loads.
10. Metals subjected to fluctuated or repeated forces fail at
(a) Lower
(b) Higher
(c) The same
(d) None of the above
Stresses as those from the same metals carrying dead steady loads.
11. The fatigue limit is usually (a) 0.5 of the UTS.
(b) 1.3 of the UTS.
(c)
The same as yield strength. (d) Has no relation.
12.The cross sectional area for apart made from steel of 0.2% offset yield strength 420
Mpa and ultimate tensile strength 600 Mpa, if it is required to carry a static load of 5000
KN is :- (a)1.5cm2 ( b)2cm2
(c)2.3 cm2 (d)3 cm2
13. The test used to find the endurance limit or fatigue limit of a material is called:(a) Tension test
(b) hardness test
(c) fatigue test
(d) creep test
14. The test used to find the resistance of the surface to indentation or plastic deformation is
called (a) Tension test
( b) hardness test
(c) fatigue test (d) creep test
15. The test used to measure the toughness due to sudden impact is called
(a) Impact test (b) tension test (c) hardness test (d) fatigue test
16.In stress-stain curve resilience is the area under
(a) elastic region
(b)plastic region (c)area under all the curve
(d) none of the above
17. Parts work under impact loading must be assessed by the (a)Tension test
(b)Fatigue test
(c)Impact test
(d)Hardness test
ANSWER
DIFFICULTY
B
E
B
E
B
E
D
E
B
M
D
E
C
E
A
M
A
E
A
E
A
M
C
D
C
E
B
E
A
E
A
M
C
E
Questions Banks>>>>>>>>>>>>>>>>>>>Examples: (Q & A) MATERIAL SELECTION
QUESTION
1. A proper selection of a material suitable for applications involving heavy frictional forces
should be based on the property of:(a) Hardness. (b) Ductility. (c) Toughness. (d) Tensile strength.
2. A proper selection of a material suitable for applications carrying static dead loads should
ANSWER
DIFFICULTY
A
E
be based on the property of: (a) Hardness
(b) Toughness
(c) Yield
strength (d) Fatigue limit
3.A proper selection of a material suitable for applications subjected to dynamic loading
forces should be based on the property of:(a) Hardness. (b) Ductility. (c)Toughness (d) Fatigue strength.
4.A proper selection of a material suitable for applications exposed to high
temperatures for long times should be based on the property of:(a) Hardness (b) Creep strength.
(c) Ductility (d) Fatigue strength.
5.Parts subjected to acidic media are usually made of:(a) Low carbon steels
(b) Tool steels (c) Stainless steels
(d) Heat resisting steels.
6.The main difference between the heat resistant and the stainless type steels is:(a)Carbon content (b) Nickel content. (c) Chromium content. (d) None of the above.
7.Steels containing molybdenum are usually recommended for:(a) High temperature applications (b)Room temperature applications
(c) Wear resistance applications
(d) High electrical conductivity
8.Alloy steels are usually specified for machine parts because of their:(a) Higher strength.
(b) Hardenability.
(c) Higher ductility
(d) Both a & b.
9.The main difference between gray cast iron and white cast iron is:(a) The shape of graphite; flake or nodular.
(b) The type of carbon; Combined or free.
(c) The shape of cementite; lamellar or broken.
(d) None of the above.
10.The main difference between gray cast iron and nodular cast iron is:(a)The shape of graphite; flake or nodular.
(b) The type of carbon; Combined or free.
(c) The shape of cementite; lamellar or broken. (d) None of the above.
11.The main difference between malleable cast iron and white cast iron is:(a) The shape of graphite; flake or nodular.
(b) The type of carbon; combined or free.
(c) The shape of cementite; lamellar or broken. (d) None of the above.
12.Fusible alloys used for manufacturing fuses include diaphragms:(a) Nickel alloys.
(b) Aluminum alloys.
(c) Copper alloys.
(d) Lead-tin alloys.
13.The greatest ductility is obtained in ………………… cast iron.
(a) White
(b) Gray
(c) Nodular
(d) Malleable
14. Cast iron containing graphite flakes is called:(a) White cast iron
(b) Gray cast iron
(c) Nodular cast iron
(d) Malleable cast iron
15. Cast iron containing spheroids of graphite is called:(a) White cast iron
(b) Gray cast iron
(c) Nodular cast iron
(d) Malleable cast iron
16. Gray cast iron is used for making:(a) Motor housings
(b) Tools
(c) Springs
(d) Grinding balls
17.Thermal radiators that require high thermal conductivity are usually made from:(a)Steel (b)Lead alloys. (c)Aluminum alloys. (d)Copper alloys.
18.Parts subjected to high temperatures exceeding 800 0C are usually made of :- a) Low
carbon steels b) Stainless steels c) Heat resisting steels d) (b) and (c)
19. The main difference between the carbon steels and the stainless steels is :- a)
Carbon content.
b) Nickel content. c) Chromium content. d) All of the above.
20.Nodular cast iron is used in
preference to gray cast iron for making (a) Motor
housings
(b) Tools
(c) Springs
(d) Grinding balls
21. An important non-ferrous alloy is: (a) Al-Si alloy (b) silicon carbide (c) cast iron (d) acrylic
22. Low- carbon steel, medium carbon steel and high carbon steel form a group of steel
called:(a) Stainless steel
(b) Tool steel
(c)Plain carbon steel
(d)Heat resisting steel
23.Repars and structural parts are made from: - (a) low carbon steel
(b)
medium carbon steel
(c) High carbon steel
(d) stainless steel
24. Pistons and some car engine parts are made from:(a) Al-Si alloy
(b) Cu-alloys
(C) low-carbon steel
(d) stainless steel
25.-Machine parts are usually made from :(a) Medium carbon steel (b)Low
alloy steel
(c) Stainless steel
(d) Both a&b
C
E
D
M
B
M
C
M
A
M
A
M
D
M
B
M
A
M
C
M
D
M
C
M
B
M
C
M
A
M
D
M
D
M
D
M
A
M
A
M
C
M
A
M
A
M
D
M
26. Carpenter saws and other tools are made from:- (a) low carbon steel
(b)high carbon steel
(c) copper alloys
(d) Al alloy
27.Parts subjected to acidic dia media are usually made of :(a) Low carbon steels
(b) Tool steels (c) Stainless steels
(d) Heat resisting steels.
28.The main difference between the cast heat resistant and the stainless steels is:- (a)
Carbon content
(b) Nickel content
(c) Chromium content
(d) Non of the previous.
B
M
C
M
M
A
29. The main difference between gray cast iron and white cast iron is:(a) The shape of graphite; flake or nodular.
(b) The type of carbon combined or free.
(c) The shape of cementite; round or lamellar.
(d) None of the above.
30. Low C steels are used for making:(a) Motor housings
(b) Tools
(c) Springs
(d) Automobile body sheets.
31.High C steels are used for making:(a) Re-bars (b) cutting Tools
(c) Springs
(d) Automobile body sheets
32.High C steels are used for making cutting tools because:(a) high c steels have
high strength (b) high c steels have high ductility
(c) high c steels have high modulus of elasticity
(d) both (a) and (c)
33. Brasses are used in applications requiring:- (a) High thermal conductivity (b)
High electrical conductivity
(c) resistance to corrosion
(d) All of the above.
34. Bronzes are Cu-alloys containing:(a) Mn
(b) Sn
(c) Zn
(d) None of the above.
35 The highest strength commercial copper alloys are (a) Brasses
(b) Bronzes
(c) Pure copper (d) Monel
36.
The main strengthening mechanism in the aluminum alloys is:(a) Normalizing
(b)Precipitation hardening (c)Annealing (d) Forming martensite.
37.Copper and its alloys posses …………
and is thus suitable for marine
applications:(a)high corrosion resistance (b) High electrical and thermal conductivity
(c) high ductility (d) all of the above.
38.lectrical cables are usually made of pure Al or pure Copper because they have
(a)High electrical conductivity (b)High thermal conductivity (c) Light weight
(d) High resistance to corrosive media
39.Stainless steels are always recommended when Parts are (a) Subjected to high
temperature (b) Exposed to acidic media (c) Carry high loads
(d) Work under frictional conditions.
40.The furnace parts which are exposed to high oxidation conditions are usually made
from:- (a) Stainless steels (b) Heat resistant steels (c) Hadfield steel
(d) Cast iron.
41. The cars frame-structure are made from:- (a)Low carbon steel
(b)High
carbon steel
(c) Tool steel
(d) Medium carbon steel
42. Surgery tools are made from:- (a)Low carbon steel
(b)High carbon steel
(c)Tool steel
(d)Stainless steel
43.Drilling and excavation parts are made from:(a)Tool steel
(b)High carbon steel
(c)Stainless steel
(d)Low carbon steel
44. Pure copper and Al are used in conditions requiring: - (a)High strength
(b) High wear resistance (c) High electrical conductivity (d)High electrical resistance
47. An important application of pure copper and pure aluminum is the manufacturing
of:- (a) Gears
(b) Electrical cables
(c)Car body
(d) Car pistons
47. Cu-Zn alloys are used for conditions requiring:- (a)High corrosion resistance
(b)High wear resistance (c)High temperature applications (d) High ductility
48. Cu-Sn alloys are used for conditions requiring: (a) High corrosion resistance combined with high strength (b)High strength (c) High
temperature applications (d) High wear resistance
49. The commercial name given to the Cu-Zn alloys is:(a) Bronze
( b) brass (c) Duralumin
( d) Monel
B
M
D
M
B
M
D
M
D
M
B
E
B
M
B
M
D
E
A
E
B
E
A
M
D
M
D
E
A
M
C
E
B
E
A
M
A
M
B
E