Theory of Machine
Whirling speed of the shaft is the speed at which

Shaft tends to vibrate vigorously in transverse direction
Torsional vibrations occur
Combination of transverse and longitudinal vibration occurs
Shaft tends to vibrate in longitudinal direction

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Theory of Machine
In order to give a complete secondary balance of a multi-cylinder inline engine,

Both (A) and (B)
The algebraic sum of the couples about any point in the plane of the secondary forces must be equal to zero
None of these
The algebraic sum of the secondary forces must be equal to zero

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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

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

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