Machine Design
The shock absorbing capacity of a bolt can be increased by

Increasing shank diameter
Grinding the shank
Tightening it properly
Making shank diameter equal to core diameter of thread

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Machine Design
Cap screws are

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

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Machine Design
In case of V belt drive

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

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