For occurrence of free torsional vibration in a three rotor system wh – McqOptions

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1.	For occurrence of free torsional vibration in a three rotor system 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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