For occurrence of free torsional vibration which of the condition is n – McqOptions

MCQOPTIONS

1.	For occurrence of free torsional vibration which of the condition is necessary?
A.	Rotors moving in same direction
B.	Rotors having same frequency
C.	Rotors having different frequency
D.	Rotors rotate in the same sense
Answer» C. Rotors having different frequency

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