Theory of Machine
A reed type tachometer use the principle of

Torsional vibration
Damped free vibration
Transverse vibration
Longitudinal vibration

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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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Theory of Machine
Pitch point on a cam is

The point on cam pitch curve having the maximum pressure angle
The point on cam pitch curve having the minimum pressure angle
Any point on pitch circle
Any point on pitch curve

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