Question

Speed regulation of DC shunt motor is calculated by ratio of difference of full load speed and no-load speed with full load speed.

(a) True

(b) False

The question was asked during an internship interview.

My question is taken from Speed Control Using Field Control of Shunt Motor topic in division DC Motors of DC Machines

Answer 1

Correct answer is (b) False

To elaborate: Speed regulation is defined as a ratio of difference of no-load speed with full load speed with no-load speed. Here, no-load speed is more than the full load speed. Thus, we divide difference by no-load value and not by full load value.