Machine Design
In a horizontal flat belt drive, it is customary to use

Bottom side of belt as slack side
Top side of belt as slack side
None of these
Idler pulley

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Machine Design
A compound belt drive is used when

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

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