Question

What is the coefficient of fluctuation of speed?

(a) The ratio of the maximum fluctuation of speed to the mean speed

(b) The ratio of the maximum fluctuation of energy to the mean speed

(c) The ratio of the minimum fluctuation of energy to the mean speed

(d) The ratio of the work done per cycle to the mean speed

This question was addressed to me by my college director while I was bunking the class.

The doubt is from Flywheel topic in chapter Internal Combustion Engines of Automobile Engineering

Answer 1

Correct choice is (a) The ratio of the maximum fluctuation of speed to the mean speed

The best explanation: The coefficient of fluctuation of speed is the ratio of the maximum fluctuation of speed to the mean speed. Cs = (ω1 – ω2)/ω =2 (ω1 – ω2) / (ω1+ω2) or Cs = 2(N1-N2) / (N1+N2).