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Belt drives: when is an open belt drive used? Assume parallel shafts and standard flat/V-belt arrangements. Identify the shaft rotation condition that requires an open belt. Choose the correct option.

Difficulty: Easy

Correct Answer: Parallel shafts rotating in the same direction

Explanation:

Concept
Open belt layouts are used when both pulleys must rotate in the same direction. A crossed belt reverses rotation (opposite directions).


Why option (b)
With parallel shafts and an open wrap, the belt does not cross; thus driving and driven pulleys rotate identically.


Final Answer
Parallel shafts rotating in the same direction

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