Theory of Machine
The ratio of maximum fluctuation of energy to the work-done per cycle is called

Fluctuation of energy
None of these
Maximum fluctuation of energy
Coefficient of fluctuation of energy

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Theory of Machine
Hammer blow

Varies inversely with the square of the speed
Is the maximum vertical unbalanced force caused by the mass added to balance the reciprocating masses
Varies as the square root of the speed
Is the maximum horizontal unbalanced force caused by the mass provided to balance the reciprocating masses.

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

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

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