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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Machine Design
Set screws are

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

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