Whirling speed of shaft is the speed at which:

1.	Whirling speed of shaft is the speed at which:
A.	Shaft tends to vibrate in longitudinal direction
B.	Torsional vibrations occur
C.	Shaft tends to vibrate vigorously in transverse direction
D.	Combination of transverse and longitudinal vibration occurs.
Answer» D. Combination of transverse and longitudinal vibration occurs.

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Whirling speed of shaft is the speed at which:

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