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Engineering Materials

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

Invar
High speed steel
Stainless steel
Heat resisting steel

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Engineering Materials
When a steel containing __________ 0.8% carbon is cooled slowly below the lower critical point, it consists of ferrite and pearlite.

Equal to
Less than
None of these
More than

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Engineering Materials
Which of the following is not the correct method of increasing fatigue limit?

Shot peening
Cold working
Surface decarburisation
Nitriding of surface

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Engineering Materials
The hardness is the property of a material due to which it

Can be rolled or hammered into thin sheets
Breaks with little permanent distortion
Can be drawn into wires
Can cut another metal

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Engineering Materials
The temperature at which ferromagnetic alpha iron transforms to paramagnetic alpha iron is

910°C
1050°C
770°C
Below recrystallization temperature

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Engineering Materials
The aluminium alloy, mainly used, for anodized utensil manufacture, is

Y-alloy
Duralumin
Magnalium
Hindalium

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