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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
The machinability of steel is improved by adding

Sulphur, lead and phosphorus
Chromium
Nickel
Nickel and chromium

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Engineering Materials
Hardness of lower bainite (tempered martensite) is about

RC 80
RC 65
RC 57
RC 48

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Engineering Materials
Vanadium in high speed steels

Promotes decarburisation
Forms very hard carbides and thus increases wear resistance
Promotes retention of austenite
Provides high hot hardness

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Engineering Materials
Cupola produces following material

Pig iron
Wrought iron
Malleable iron
Cast iron

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Engineering Materials
Iron-carbon alloys containing 1.7 to 4.3% carbon are known as

None of these
Eutectic cast irons
Hypereutectic cast irons
Hypoeutectic cast irons

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