Machine Design
In a multiple V-belt drive, if one of the belts break, then

Only the broken belt is replaced
The broken belt need not to be replaced
The broken belt and the belt on either side of it, is replaced
The entire set of belts is replaced

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Machine Design
A bolt of uniform strength can be developed by

Keeping the core diameter smaller than the diameter of the unthreaded portion
Keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt
Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt
None of these

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