Question

The sensitiveness of a governor is given by

(a) ωmean/ω2 – ω1

(b) ω2 – ω1/ ωmean

(c) ω2 – ω1/ 2ωmean

(d) none of the mentioned

I have been asked this question in class test.

This key question is from Governors topic in division Governors of Machine Dynamics

Answer 1

Correct choice is (b) ω2 – ω1/ ωmean

The explanation is: Let N1 = Minimum equilibrium speed,

                         N2 = Maximum equilibrium speed, and

                         N = Mean equilibrium speed = N1 + N2 / 2

Sensitiveness of the governor = N1 – N2 / 2

                              = 2(N1 + N2) / N1 + N2

                              = ω2 – ω1/ ωmean

where ω1 and ω2 = Minimum and maximum angular speed, and

ωmean = Mean angular speed.