Theory of Machine
Frequency of vibrations is usually expressed in

Number of cycles per minute
Number of cycles per hour
Number of cycles per second
None of these

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Theory of Machine
Power of a governor is the

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

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Theory of Machine
Crowning on pulleys helps

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

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