Machine Design
The coefficient of friction between the belt and pulley depends upon the

All of these
Slip of belt
Material of belt and pulley
Speed of belt

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Machine Design
Cap screws are

Slotted for a screw driver and generally used with a nut
Provided with detachable caps
Used to prevent relative motion between parts
Similar to small size tap bolts except that a greater variety of shapes of heads are available

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