Theory of Machine
Frequency of vibrations is usually expressed in

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

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Theory of Machine
The maximum fluctuation of energy is the

Difference between the maximum and minimum energies
Sum of the maximum and minimum energies
Variations of energy above and below the mean resisting torque line
Ratio of the mean resisting torque to the work-done per cycle

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