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Engineering Materials

Engineering Materials
In nodular iron, graphite is in the form of

Cementite
Free carbon
Flakes
Spheroids

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Engineering Materials
The stiffness is the ability of a material to resist

Fracture due to high impact loads
None of these
Deformation under stress
Externally applied forces with breakdown or yielding

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Engineering Materials
The lower critical temperature

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

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Engineering Materials
Constantan an alloy used in thermocouples is an alloy of

Copper and nickel
Copper and iron
Copper and zinc
Copper and tin

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Engineering Materials
In high speed steels, manganese is used to tougher the metal and to increase its

Critical temperature
Melting point
Hardness
Yield point

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

Nickel
Silicon
Chromium
Copper

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