Mechanical

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Production Technology
1. The approach of a manufacturing process in which unwanted extra material from
stock material is removed to get desired size/shape is
a) Welding
b) Casting
c) Metal cutting
d) Forming
Answer- c) Metal Cutting
2. Deformation based manufacturing process is preferred for
a) Low yield strength, low ductility metals
b) High yield strength, high ductility metals
c) Low yield strength, high ductility metals
d) High yield strength, low ductility
Answer- c) Low yield strength, high ductility metals
3. Machining process suffers from
a) Internals defects
b) Loss of metal worth
c) Poor control over dimensions
d) High rejection rate
Answer- b) Loss of metal worth
4. Welding is not preferred for
a) Large structural fabrication
b) Joining dissimilar metal
c) Highly reliable joint
d) Joining mild steel
Answer- c) Highly reliable joint
5. Property of metal which is not important for casting process
a) Melting point
b) Solidification temperature range
c) Chemical affinity of gases with metal
d) Yield strength
Answer- d) Yield strength

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6. Solid state welding of a metal is not influenced by
a) Yield strength
b) Ductility
c) Surface cleanliness
d) Melting point
Answer- d) Melting point
7. Solidification temperature range of a metal during fusion welding does not affect
a) Porosity
b) Hot cracking
c) Cold cracking
d) Alloy segregation
Answer- c) Cold cracking
8. Classification of casting process based on the way metal is treated
a) Positive process
b) Negative process
c) Zero process
d) Regenerative process
Answer- c) Zero Process
9. Manufacturing process based on altering the microstructure of workpiece to improve
the mechanical properties is
a) Casting
b) Forming
c) Brazing
d) Heat treatment
Answer- d) Heat treatment
10. An example of capital good is
a) Pen
b) Steel plate
c) Nut and bolts
d) Lathe machine
Answer- d) Lathe machine

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11. For high dimensional accuracy and good surface finish, the manufacturing process
preferred is
a) Casting
b) Welding
c) Machining
d) Forming
Correct Answer- c) Machining
12. Hooks for material handling heavy items using cranes are manufactured using
e) Casting
f) Machining
g) Welding
h) Forming process
Correct answer- d) Forming process
13. Rail joints for railways are commonly made using
a) Arc welding
b) Gas welding
c) LASER welding
d) Thermit welding
Correct answer- d) Thermit welding
14. Transformation hardening of alloy steel does not occur in case of
a. Casting
b. Welding
c. Rough machining under drying conditions
d. Soldering
Correct answer- d) Soldering
15. Increase in strength, hardness and toughness of a crystalline material is generally
achieved by
a. Work hardening
b. Transformation hardening
c. Grain refinement
d. Dispersion hardening
Correct answer- c) Grain refinement
16. Low cooling rate during the casting leads to
a. Fine grain structure
b. Coarse grain structure
c. No change in grain size

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d. Nano-structure
Correct answer- b) Coarse grain structure
17. Machining process involving melting can result in the surface with
a. As cast layer
b. Heat affected zone
c. Loss of alloying elements
d. All of the above
Correct answer- d) All of the above
18. High thermal conductivity metals during casting increases the tendency of
a. Misrun
b. Hot tearing
c. Distortion
d. All of the above
Correct answer- d) All of the above
19. The region last to solidify in casting generally has
a. Low concentration of alloying element
b. High concentration of alloying element
c. Less defects
d. Uniform distribution of alloying elements
Correct answer- b) High concentration of alloying element
20. Lower flask of the moulding system is called
a. Cope
b. Drag
c. Cheek
d. End gate
Correct answer- b) Drag
21. Melt treatment does not involve
a) Fluxing
b) Degasing
c) Alloying for improving structure of casting
d) Segregation
Correct answer – d) Segregation
22. Microstructure of cast aluminum alloys is commonly refined using
a. Fe
b. Ti
c. V
d. Ni

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Correct answer – b) Ti
23. Mould made of steels is termed as
a. Permanent mould
b. Expendable mould
c. Permanent and expandable moulds interchangeably
d. Shell mould
Correct answer – a) Permanent mould
24. The molten metal enters in the mould cavity through
a. Pouring basin
b. Sprue
c. Runner
d. In-gate
Correct answer – d) In-gate
25. In general, pattern is made of different in size from final casting due to
a. Pattern allowances
b. Core prints
c. Gradual change in cross section by providing fillets
d. All of the above
Correct answer – d) All of the above
26. Solid state shrinkage of casting is taken care of using
a. Draft allowance
b. Riser
c. Shrinkage allowance
d. Wrapping allowance
Correct answer – c) Shrinkage allowance
27. Double shrinkage allowance is considered when it is required to use
a. Wooden pattern and metallic casting
b. Plastic pattern and metallic casting
c. Metallic pattern and metallic casting
d. Plaster of paris pattern and metallic casting
Correct answer - c) Metallic pattern and metallic casting
28. Draft allowance is given at
a. Vertical surface of pattern
b. Horizontal surface of patterns
c. Tapered surface of pattern
d. Outer surface only
Correct answer – a) Vertical surface of pattern

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29. During casting, strength of the mould which provides support to molten metal is
a. Green strength
b. Hot strength
c. Dry strength
d. Normal strength
Correct answer- b) Hot strength
30. Collapsibility of moulding sand helps in
a. Easy withdrawal of casting from mould
b. Reducing hot tearing tendency
c. Reducing residual stress
d. All of the above
Correct answer- d) All of the above
31. Permeability of sand mould is influenced by
a. Moisture
b. Clay
c. Sand grain size and shape
d. All of the above
Correct answer- d) All of the above
32. Use of mold wash in sand moulding increases
a. Surface finish
b. penetration
c. Tolerance
d. Accuracy
Correct answer- a) Surface finish
33. Core for metallic mould is made of
a. Wood
b. Plastic
c. Metal
d. Sand
Correct answer- d) Sand
34. Chaplets are generally made of
a. Moulding sand
b. Core sand
c. Wood
d. Metal
Correct answer- d) Metal

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35. Pouring basin in the gating system does not act as
a. Reservoir of the molten metal
b. Filter for the molten metal
c. Feeder of molten metal to sprue
d. Degasser
Correct answer- d) Degasser
36. If using 1.6 kg molten metal, final casting of 800 g is obtained then yield (%) of the
casting process will be
a. 2
b) 0.5
c) 800
d) 1.28
Correct answer- b) 0.5
Yield of casting =
𝑀𝑎𝑠𝑠 𝑜𝑓 𝑡ℎ𝑒 𝑓𝑖𝑛𝑎 𝑎𝑠𝑡𝑖𝑛𝑔
𝑀𝑎𝑠𝑠 𝑜𝑓 𝑡ℎ𝑒 𝑚𝑜𝑙𝑡𝑒𝑛 𝑚𝑒𝑡𝑎𝑙 𝑝𝑜𝑢𝑟𝑒𝑑
= 800 𝑔 = 0.5
1.6 𝑘𝑔
37. For making a hole in aluminium casting (density 0.0265 N/cm3
), a core of 200 mm
diameter and 800 mm length is used. Consider value of core density is 0.01650 N/cm3
.
The minimum core print area (in cm2
) required will be
a. 7 to 8
b) 50-60
c) 70-80
d) 700-800
Correct answer- c) 70-80
Density of cast metal, 𝜌 = 0.0265 N/cm3
Density of core material, 𝑑 = 0.0165 N/cm3
Volume of the core, V = 𝜋
𝑑2ℎ =
𝜋
× 202 × 80 = 25120 𝑐𝑚3
4 4

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Buoyancy force = (𝜌 − 𝑑) = 21520 (0.0265 − 0.0165) = 251.2 N Supported
load by core print = 3.5×Ac (where Ac is in cm2
)
Minimum core print area required = Buoyancy force =
251.2
= 𝟕𝟏. 𝟕𝟕 𝒄𝒎𝟐
3.5 3.5
Range- 70-80 cm2
38. Deficient riser design leads to
a. Increased soundness of casting
b. Increase in yield of casting
c. Decrease in yield of casting
d. Increased porosity
Correct answer- c) Decrease in yield of casting
39. High thermal expansion coefficient of metal like cast Al alloys show
a. Less yield
b. More yield
c. Same yield
d. All of the above
Correct answer- a) Less yield
40. Molten metal of riser should solidify at
a. First
b. Last
c. Same as casting in mould
d. Any time
Correct answer- b) Last
41. Barrel for tumbling process is generally rotated at
a. 3-4 rpm
b. 30-40 rpm
c) 400-500 rpm
d) 4000-5000 rpm
Correct Answer- b) 30-40 rpm
42. Low permeability of moulding sand leads to
a. Air inclusion
b. Hot tearing
c. Distortion
d. Cracking

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Correct Answer- a) Air inclusion
43. Swell defect in casting is caused by
a. Poor collapsibility
b. Poor moulding sand property
c. Poor plasticity
d. High clay content
Correct Answer- b) Poor moulding sand property
44. Choice of thickness of shell in shell moulding depends on
a. Casting size
b. Pouring temperature of melt
c. Complexity of shape
d. All of the above
Correct Answer- d) All of the above
45. In shell moulding, wall thickness of shell
a. Increases with increase in both pattern temperature and holding time
b. Decreases with pattern temperature and increases with holding time
c. Increases with pattern temperature and decreases with holding time
d. Decreases with increase in both pattern temperature and holding time
Correct Answer- a) Increases with increase in both pattern temperature and holding
time
46. Expendable mould is used in
a. Die casting
b. Metal mould casting
c. Investment casting
d. Hot chamber die casting
Correct Answer- c) Investment casting
47. Permanent mould can be made of
a. Refractory sand
b. Plaster of paris
c. Silica sand
d. Graphite
Correct Answer- d) Graphite
48. Manufacturing process in which plastic deformation is not used for

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shaping/sizing purpose is
a. Rolling
b. Welding
c. Forging
d. Extrusion
Correct Answer- b) Welding
49. Success/ease of deformation of a metal in metal working process is not affected by
a. Yield strength
b. Ductility
c. Work hardening tendency
d. Thermal diffusivity
Correct Answer- d) Thermal diffusivity
50. Hot working and cold working improves mechanical properties by
a. Grain refinement and work hardening respectively
b. Work hardening and grain refinement respectively
c. Grain refinement and work hardening both
d. Dispersion hardening
Correct Answer- a) Grain refinement and work hardening respectively
51. In rolling process, rolled plates will experience
a. Reduction in thickness and increase in width
b. Reduction in width and increase in thickness
c. Reduction in thickness and no change in width
d. Both width and thickness get reduced
Correct answer- c) Reduction in thickness and no change in width
52. Angle of bite
a. For hot rolling is lower than cold rolling
b. For cold rolling is lower than hot rolling
c. For cold rolling and hot rolling is same
d. Is not important for both cold rolling and hot rolling
Correct answer- b) For cold rolling is lower than hot rolling
53. Drawing out results in
a. Increase in length and reduction in cross section area
b. Reduction in length and increase in cross section area
c. Any kind of variation is possible
d. Hollow cross section products

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Correct answer- a) Increase in length and reduction in cross section area
54. Press forging uses
a. Open die
b. Hammer
c. Closed die
d. Flexible die
Correct answer- c) Closed die
55. Maximum change in cross section area in one go can be achieved using
a. Rolling
b. Forging
c. Extrusion
d. All of the above
Correct answer- c) Extrusion
56. For reducing cross sectional area, wire drawing uses
a. Indirect compressive stress
b. Indirect tensile stress
c. Indirect shear stress
d. Direct bending stress
Correct answer- a) Indirect compressive stress
57. In wire drawing, final size of wire is determined by
a. Approach region of the die
b. Bearing area of the die
c. Exit zone of the die
d. Efficiency of the die
Correct answer- b) Bearing area of the die
58. Cold wire drawing results in
a. High strength
b. Poor finish
c. High tolerance
d. Oxidation
Correct answer- a) High strength
59. Sheet metal operation in which shear stress used is
a. Blanking
b. Drawing

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c. Coining
d. Stretch forming
Correct answer- a) Blanking
60. Action of a press indicates
a. Number of strokes
b. Power of press
c. Number of rams
d. Design of frame
Correct answer- c) Number of rams