Theory of Machine
Flexible coupling is used because

It prevents shock transmission and eliminates stress reversals
It transmits shocks gradually
It is easy to engage and disengage
It is easy to disassemble

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Theory of Machine
Power 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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