Machine Design
The shearing stresses in the inner face as compared to outer face of the wire in a heavy close coiled spring is

Smaller
Larger/smaller depending on diameter of spring coil
Equal
Larger

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Machine Design
When the speed of belt increases,

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

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