Question:

**Define:
(i) Coefficient of fluctuation of speed.
(ii) Coefficient of fluctuation of energy.**

Answer:

(i) Coefficient of fluctuation of speed: Coefficient of fluctuation of speed is defined as the ratio of the maximum fluctuation of speed to the mean speed. It is denoted by C s.

Mathematically,

C s = (N 1 – N 2 ) /N

Where, N 1 = maximum speed in rpm;

N 2 =minimum speed in rpm; N = mean speed in rpm

(ii) Coefficient of fluctuation of energy: Coefficient of fluctuation of energy may be defined as the ratio of the maximum fluctuation of energy to the work done per cycle. It is denoted by Ce.

Mathematically,

Ce = Maximum fluctuation of energy/ Work done per cycle.