Engineering Materials

81. In compression, a prism of brittle material will break

1. by forming a bulge
2. by shearing along oblique plane
3. in direction perpendicular to application of load
4. by crushing into thousands of pieces
5. none of the above.

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82. In grey cast iron, carbon is present in the form of

1. cementite
2. free carbon
3. flakes
4. spheroids
5. nodular aggregates of graphite.

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83. In malleable iron, carbon is present in the form of

1. cementite
2. free carbon
3. flakes
4. spheroids
5. nodular aggregates of graphite.

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84. In mottled cast iron, carbon is available in

1. free form
2. combined form
3. nodular form
4. flat form
5. partly in free and partly in combined state.

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85. In nodular iron, graphite is in the form of

1. cementite
2. free carbon
3. flakes
4. spheroids
5. nodular aggregates of graphite.

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86. In which of the following cases, consideration of creep is important

1. flywheel of steam engine
2. cast iron pipes”
3. cycle chains
4. gas turbine blades
5. piston I.C. engine.

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87. Inconel is an alloy of

1. nickel, chromium and iron
2. nickel, copper
3. nickel, chromium
4. nickel, zinc
5. nickel, lead.

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88. Induction hardening is the process of

1. hardening surface of workpiece to ob-tain hard and wear resistant surface
2. heating and cooling rapidly
3. increasing hardness throughout
4. inducing hardness by continuous process
5. hardening core.

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89. Iron is

1. paramagnetic
2. ferromagnetic
3. ferroelectric
4. dielectric
5. none of the above.

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90. Isotropic materials are those which have the same

1. elastic properties in all directions
2. stresses induced in all directions
3. thermal properties in all directions
4. electric and magnetic properties in all directions
5. density throughout.

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