Machine Design
Cold working

Decreases the fatigue strength
Has no influence on fatigue strength
Alone has no influence on fatigue strength
Increases the fatigue strength

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Machine Design
When the speed of belt increases,

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

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Machine Design
A tap bolt

Has head at one end and other end fits into a tapped hole in the other part to be joined
Has both the ends threaded
Has a head on one end and a nut fitted to the other
Has pointed threads

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