Theory of Machine
In a multiple V-belt drive, if one of the belts is broken, then we should replace

The broken belt and the belts on either side of it
The broken belt only
All the belts
None of these

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Theory of Machine
Lower pairs are those which have

Elements of pairs not held together mechanically
Two elements that permit relative motion
Surface contact between the two elements when in motion
Point or line contact between the two elements when in motion

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