engineering materials MCQs – Page 3

Practise focused engineering materials questions with marked answers for exam preparation and subject revision.

engineering materials Mcqs
41. Recrystallisation temperature can belowered by_________________?
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A. all of the above

B. grain refinement

C. none of the above

D. purification of metal

E. working at lower temperature

42. Lead is poured into the joint between two pipes. These pipes may be made of____________________?
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A. asbestos cement

B. concrete

C. vitrified clay

D. mild steel

E. cast iron
43. The percentage of carbon in low carbon steel is__________________?
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A. 0.15%

B. 0.7%.

C. 0.05%

D. 0.30%

E. 0.50%

44. Babbit metal is a_________________?
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A. A. and C. above

B. tin base alloy

C. lead base alloy

D. copper base alloy

E. all of the above

45. Wrought iron is________________?
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A. least resistant to corrosion

B. high in strength

C. heat treated to change its properties

D. highly resistant to corrosion

E. hard

46. Railway rails are normally made of_______________?
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A. cast iron steel

B. tungsten steel

C. high carbon

D. alloy steel

E. mild steel

47. Cast iron has_________________?
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A. none of the above

B. high ductility

C. high tensile strength

D. its elastic limit close to the ultimate breaking strength

E. all of the above

48. Chromium in steel_________________?
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A. makes steel hard

B. refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

C. gives ductility, toughness, tensile strength and anticorrosion properties

D. improves wear resistance, cutting ability and toughness

E. improves cutting ability and reduces hardenability

49. The correct sequence for descending order of machinability is _____________________?
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A. grey cast iron, wrought iron, low carbon steel

B. grey cast iron, low carbon steel, wrought iron

C. wrought iron,low carbon steel, grey cast iron

D. low carbon steel, grey cast iron, wrought iron

E. wrought iron, grey cast iron, low carbon steel

50. Pure iron is the structure of_______________?
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A. pearlite

B. ferrite

C. ferrite and cementite

D. ferrite and pearlite

E. anstenite

51. The molecules in a solid move______________?
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A. in a haphazard way

B. in circular motion

C. do not move

D. in a random manner

E. back and forth like tiny pendulums
52. Which of the following alloys does not contain tin_________________?
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A. gun metal

B. phosphor bronze

C. white metal

D. fusible metal

E. solder admiralty

53. Ductile cast iron___________________?
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A. is produced by annealing process. It is soft, tough and easily machined metal

B. is produced by small additions of magnesium (or creium) in the ladle. Graphite is in nodular or spheroidal form and is well dispersed throughout the material

C. none of the above

D. contains 1.7 to 3.5% carbon in free state and is obtained by the slow cooling of molten cast iron

E. is also known as chilled cast iron and is obtained by cooling rapidly. It is almost unmachinable

54. Tensile strength of steel can be safely in-creased by________________?
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A. adding carbon up to 0.83%

B. adding copper and carbon

C. adding carbon up to 6.3%

D. adding small quantities of copper

E. adding carbon up to 2.8%

55. Perminvar alloy having constant permeability is an alloy of________________?
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A. copper, nickel and antimony

B. iron, zinc and bismuth

C. antimony, copper and zinc

D. nickel, copper and iron

E. nickel, copper and zinc

56. Pipes for bicycle frames are made of___________________?
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A. forged steel

B. hot rolled steel

C. cold rolled steel

D. carbon-chrome steel

E. cast steel

57. Carbon steel is_______________?
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A. an alloy of iron and carbon with varying quantities of phosphorus and sulphur

B. extremely brittle

C. made by adding carbon in steel

D. extensively used for making cutting tools

E. refined from cast iron

58. Steel contains____________________?
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A. high quantities of sulphur

B. alloying elements like chromium, tungsten nickel and copper

C. 50% or more iron

D. 80% or more iron

E. elements like phosphorus, sulphur and silicon in varying quantities

59. Acidic solution is one which has pH value__________________?
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A. less than 7

B. equal to 7

C. pH value has nothing to do with neutral solution

D. greater than 7

E. none of the above

60. An important property of malleable cast iron in comparison to grey cast iron is the high___________________?
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A. ductility

B. compressive strength

C. surface finish

D. hardness

E. carbon content