Machine Design
In case of V belt drive

The belt should not touch the sides of groove in the pulley
The belt should touch the bottom of groove in the pulley
None of these
The belt should not touch the bottom of groove in the pulley

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Machine Design
Set screws are

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

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