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Engineering Materials

Engineering Materials
Depth of hardness of steel is increased by addition of

Tungsten
Nickel
Vanadium
Chromium

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

RC 57
RC 48
RC 65
RC 80

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Engineering Materials
Steel made from phosphate iron is

Brittle
Ductile
Hard
Tough

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Engineering Materials
Which of the following material has nearly zero coefficient of expansion?

Stainless steel
Invar
High speed steel
Heat resisting steel

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Engineering Materials
Gamma iron exits at following temperature

Between 1400°C and 1539°C
Between 910°C and 1400°C
Near melting point
Room temperature

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Engineering Materials
Which of the following elements does not impart hardness to steel?

Silicon
Copper
Nickel
Chromium

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