Question

In the single-cylinder, single acting, four-stroke gas engine, the total fluctuation of speed is not to exceed ±3 percent of the mean speed. What is the coefficient of fluctuation of speed?

(a) 0.04

(b) 0.03

(c) 0.09

(d) 0.06

The question was posed to me by my college director while I was bunking the class.

My question is from Flywheel in section Internal Combustion Engines of Automobile Engineering

Answer 1

The correct answer is (d) 0.06

Easy explanation: Since the total fluctuation of speed is not to exceed ±3 percent of the mean speed, therefore ω1 – ω2 = 6% ω and coefficient of fluctuation of speed = Cs = (ω1 – ω2)/ω = 0.06.