Machine Design
A bolt

Has a head on one end and a nut fitted to the other
Is provided with pointed threads
Has both the ends threaded
Has head at one end and other end fits into a tapped hole in the other part to be joined

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Machine Design
A compound belt drive is used when

Shafts are arranged parallel and rotate in the opposite directions
Shafts are arranged parallel and rotate in the same directions
Shafts are arranged at right angles and rotate in one definite direction
None of these

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