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

(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