Theory of Machine
In a mechanism, the fixed instantaneous centers are those centers which

Moves as the mechanism moves, but joints are of permanent nature
None of the listed here
Vary with the configuration of the mechanism
Remain in the same place for all configurations of the mechanism

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Theory of Machine
Effort of a governor is the

Mean force exerted at the sleeve for maximum equilibrium speed
None of these
Work-done at the sleeve for maximum equilibrium speed
Mean force exerted at the sleeve for a given percentage change of speed

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Theory of Machine
Crowning on pulleys helps

In increasing velocity ratio
Increase belt and pulley life
For automatic adjustment of belt position so that belt runs centrally
In decreasing the slip of the belt

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