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

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

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Machine Design
Machine screws are

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

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