Machine Design
The power transmitted by means of a belt depends upon

Arc of contact between the belt and the smaller pulley
Tension under which the belt is placed on the pulleys
Velocity of the belt
All of these

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Machine Design
Cap screws are

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

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