Theory of Machine
The critical speed of a shaft with a disc supported in between is equal to the natural frequency of the system in

Longitudinal vibrations
All of these
Torsional vibrations
Transverse vibrations

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Theory of Machine
When the belt is stationary, it is subjected to some tension known as initial tension. The value of this tension is equal to the

Tension in the slack side of the belt
Tension in the tight side of the belt
Average tension of the tight side and slack side of the belt
Sum of the tensions on the tight side and slack side of the belt

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