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Engineering Materials

Engineering Materials
In low carbon steels, ________ raises the yield point and improves the resistance to atmospheric corrosion.

Phosphorus
Sulphur
Manganese
Silicon

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Engineering Materials
A reversible change in the atomic structure of steel with corresponding change in the properties is known as

Solidus change
Molecular change
Physical change
Allotropic change

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Engineering Materials
Hardness of upper bainite (acicular structure) is about

RC 65
RC 80
RC 57
RC 48

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Engineering Materials
The steel widely used for motor car crankshafts is

Nickel steel
Silicon steel
Nickel-chrome steel
Chrome steel

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Engineering Materials
Which of the following has highest specific strength of all structural materials?

Magnetic steel alloys
Chromium alloys
Titanium alloys
Magnesium alloys

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Engineering Materials
The lower critical temperature

Is same for all steels
Increases as the carbon content in steel increases
Depends upon the rate of heating
Decreases as the carbon content in steel increases

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