In a gearing system, pump speed is one third of the motor. Shaft from – McqOptions

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1.	In a gearing system, pump speed is one third of the motor. Shaft from motor is 6 cm in diameter and 30cm long, the impellar shaft is 10cm diameter and 60cm long. Mass moment of inertia is 1500 Kg-m², C = 80Gn/m². Neglecting the inertia of shaft and gears calculate the frequency of free torsional vibrations in Hz.
A.	4.7
B.	5.7
C.	4.5
D.	5.5
Answer» B. 5.7

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