engineering materials MCQs – Page 4

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

engineering materials Mcqs

61. Addition of silicon to aluminium results in____________________?
0

A. none of the above

B. improvement of casting characteristics

C. one of the best known age and precipitation-hardening systems

D. improvement of corrosion resistance

E. improving machinability

62. Preheating is essential in welding ___________________?
0

A. high speed steel

B. none of the above

C. all of the above

D. all non-ferrous materials

E. cast iron

63. The crystal structure of brass is_________________?
0

A. H.C.P.

B. B.C.C.

C. Orthorhombic crystalline structure

D. none of the above

E. F.C.C.

64. Large forgings, crank shafts, axles normally contain carbon up to________________?
0

A. 0.45 to 0.55%

B. 0.05 to 0.20%

C. 1.0 to 1.2%.

D. 0.55 to 1.0%

E. 0.20 to 0.45%

65. Constantant an alloy used in thermocouples is an alloy of __________________?
0

A. copper and nickel

B. copper and iron

C. copper and chromium

D. copper and zinc

E. copper and tin

66. Paramagnetic alpha iron changes to gamma iron at_______________?
0

A. none of the above

B. 770C

C. 1539C

D. 1440C

E. 910C

67. Hardness of martensite is about___________________?
0

A. RC 48

B. RC 80

C. RC 65

D. RC 32

E. RC 57

68. Inconel is an alloy of___________________?
0

A. nickel, chromium

B. nickel, chromium and iron

C. nickel, zinc

D. nickel, lead

E. nickel, copper

69. A cold chisel is made of_______________?
0

A. mild steel

B. german silver

C. H.S.S.

D. high carbon

E. cast iron

70. Muntz metal contains copper and zinc in the ratio of________________?
0

A. 40 : 60

B. 50:50:00

C. 60 : 40

D. 0.888888889

E. 80:20:00

71. Addition of manganese to aluminium results in__________________?
0

A. improvement of casting characteristics

B. none of the above

C. improving machinability

D. improvement of corrosion resistance

E. one of the best known age and precipitation-hardening systems

72. In nodular iron, graphite is in the form of_____________________?
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A. spheroids

B. cementite

C. free carbon

D. flakes

E. nodular aggregates of graphite

73. Which is false statement about normalizing. Normalizing is done to _________________?
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A. refine grain structure

B. reduce segregation in casting

C. induce stresses-

D. relieve internal stresses

E. improve mechanical properties

74. Elinvar, an alloy used in precision instruments, hair springs for watches, etc. contains the following element as principal alloying element__________________?
0

A. aluminium

B. iron

C. copper

D. zinc

E. nickel

75. Process of austempering results in__________________?
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A. carburised structure

B. formation of bainite structure

C. lamellar layers of carbide distributed throughout the structure

D. relieving of stresses throughout a component

E. martenistic structure

76. The surface hardness of the following order is achieved by nitriding operation__________________?
0

A. 250 VPN

B. 1500 VPN

C. 2000 VPN

D. 600 VPN

E. 1000 to 1100 VPN

77. Corrosion resistance of steel is increased by adding__________________?
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A. tungsten and sulfur

B. none of the above

C. nickel and molybdenum

D. chromium and nickel

E. aluminium and zinc

78. The crystal structure of gamma iron is_________________?
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A. orthorhombic crystal

B. face centred cubic

C. cubic structure

D. hexagonal close packed

E. body centred cubic

79. The correct composition of Babbit metal is__________________?
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A. 90% Sn, 2% Cu, 4% Sb, 2% Bi, 2% Mg

B. 82% Sn, 4% Cu, 8% Sb, 3% Al, 3% Mg

C. 87% Sn, 4% Cu, 8% Sb, 1% Al

D. none of the above

E. 87.75% Sn, 4% Cu, 8% Sb, 0.25% Bi

80. The presence of sulphur in pig iron makes__________________?
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A. it hard

B. it brittle

C. the casting unsound

D. it easily machinable

E. increases the fluidity

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