A single cylinder oil engine works with a three rotor system, the shaf – McqOptions

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1.	A single cylinder oil engine works with a three rotor system, the shaft length is 2.5m and 70mm in diameter, the middle rotor is at a distance 1.5m from one end. Calculate the free torsional vibration frequency for a single node system in Hz if the mass moment of inertia of rotors in Kg-m² are: 0.15, 0.3 and 0.09. C=84 kN/mm²
A.	171
B.	181
C.	191
D.	201
Answer» B. 181

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