Question

A geared system possessed a kinetic energy if 200kJ, later it was converted into a two-rotor system connected by a shaft. The kinetic energy of the equivalent system will be_____

(a) 200 kJ

(b) less than 200 kJ

(c) more than 200 kJ

(d) Dependent on the length of the equivalent shaft

I got this question in semester exam.

Question is taken from Free Torsional Vibrations of a Geared System in division Torsional Vibrations of Machine Dynamics

Answer 1

Correct answer is (a) 200 kJ

Explanation: If the geared system is converted into an equivalent system of rotors connected by a shaft then the kinetic energy of the original and the equivalent system must be same.