Machine Design
The creep in the belt is due to

Effect of temperature on belt
Unequal extensions in the belt due to tight and slack side tensions
Material of belt
Stresses beyond elastic limit of belt material

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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
None of these
Shafts are arranged at right angles and rotate in one definite direction

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