Machine Design
A hot short metal is

Brittle when cold
Brittle when hot
Brittle under all conditions
Ductile at high temperature

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Machine Design
When a machine member is subjected to torsion, the torsional shear stress set up in the member is

Zero at the centroidal axis and maximum at the outer surface of the member
Maximum at the centroidal axis and zero at the outer surface of the member
Maximum at both the centroidal axis and outer surface of the member
Zero at both the centroidal axis and outer surface of the member

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Machine Design
Form coefficient of spring is

Concerned with strength of wire of spring
Its capability of storing energy
Ratio of coil diameter to wire diameter
Load required to produce unit deflection

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