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Engineering Materials

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

RC 57
RC 80
RC 65
RC 48

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Engineering Materials
Manganese in steel increases its

Fluidity
Tensile strength
Ductility
Hardness

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Engineering Materials
White metal contains

63 to 67% nickel and 30% copper
88% copper and 10% tin and rest zinc
Alloy of tin, lead and cadmium
Silver and chromium

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Engineering Materials
The addition of which of the following improves machining of copper?

Zinc
Vanadium
Sulphur
Tin

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Engineering Materials
An eutectoid steel consists of

Pearlite and cementite
Pearlite and ferrite
Wholly pearlite
Wholly austenite

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Engineering Materials
Which of the following impurity in cast iron makes it hard and brittle?

Phosphorus
Sulphur
Silicon
Manganese

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