+1 vote
in Machine Dynamics by (34.3k points)
If the length inertia is decreased to nine times, then what will be the effect on free torsional vibrations of a single motor system?

(a) Increases 3 times

(b) Increases 9 times

(c) Decreases 9 times

(d) Decreases 3 times

I got this question during an online exam.

My doubt is from Free Torsional Vibrations of a Single Rotor System topic in portion Torsional Vibrations of Machine Dynamics

1 Answer

0 votes
by (38.6k points)
The correct choice is (a) Increases 3 times

The best explanation: Since the free torsional vibrations of a single motor system depends on the inverse of square root of the length, decreasing 9 times will lead to increase in 3 times the initial vibration.

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