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

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Machine Design
When the speed of belt increases,

The coefficient of friction between the belt and pulley increases
The power transmitted will decrease
The coefficient of friction between the belt and pulley decreases
The power transmitted will increase

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