Machine Design
A hot short metal is

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

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Machine Design
In worm, gears, pitch lead angle is

None of these
Half the angle between two inclined faces in axial plane
The angle between the tangent to the pitch helix and an element of the cylinder
The angle between the tangent to the pitch helix and the plane of rotation

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