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Engineering Materials

Engineering Materials
Quenching is not necessary when hardening is done by

Any one of these
Nitriding
Flame hardening
Case hardening

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Engineering Materials
Closed packed hexagonal space lattice is found in

None of these
Zinc, magnesium, cobalt, cadmium, antimony and bismuth
Gamma-iron, aluminium, copper, lead, silver and nickel
Alpha-iron, tungsten, chromium and molybdenum

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Engineering Materials
Recrystallization temperature can be lowered by

Purification of metal
Working at lower temperature
All of these
Grain refinement

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Engineering Materials
Aluminium bronze contains aluminium and copper in the ratio of

40 : 60
2.5277777777778
0.47916666666667
2.1180555555556

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Engineering Materials
Chromium when added to steel _________ the tensile strength.

Does not effect
None of these
Decreases
Increases

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Engineering Materials
Iron-carbon alloys containing carbon ________ 4.3% are known as hyper-eutectic cast irons.

None of these
Equal to
Less than
More than

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