Machine Design
When a closely coiled helical spring is subjected to a couple about its axis, the stress induced in the wire material of the spring is

A combination of bending stress and direct shear stress
Bending stress only
A combination of torsional shear stress and bending
Direct shear stress only

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Machine Design
The face of the tooth is the

Surface of the top of the tooth
Surface of the tooth below the pitch surface
Width of the tooth measured along the pitch circle
Surface of the tooth above the pitch surface

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Machine Design
Stress concentration is caused due to

Abrupt change of section
Variation in properties of material from point to point in a member
All of these
Pitting at points or areas at which loads on a member are applied

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