Machine Design
If the centre distance of the mating gears having involute teeth is varied within limits, the velocity ratio

Remains unchanged
Increases
Decreases
None of these

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Machine Design
A bolt

Is provided with pointed threads
Has head at one end and other end fits into a tapped hole in the other part to be joined
Has a head on one end and a nut fitted to the other
Has both the ends threaded

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