Theory of Machine
A body is said to be under forced vibrations, when

None of these
There is a reduction in amplitude after every cycle of vibration
A body vibrates under the influence of external force
No external force acts on a body, after giving it an initial displacement

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Theory of Machine
Effort of a governor is the

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
Work-done at the sleeve for maximum equilibrium speed

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