Machine Design
A screw is said to be over hauling screw, if the

Friction angle is equal to helix angle
Friction angle is more than helix angle
Friction angle is less than helix angle
Efficiency of screw is 100%

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Machine Design
When the speed of belt increases,

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

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