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Speed regulation of a DC shunt motor is equal to 10%, at no load speed of 1400 rpm. What is the full load speed?

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Speed regulation of a DC shunt motor is equal to 10%, at no load speed of 1400 rpm. What is the full load speed?

(a) 1233 rpm

(b) 1273 rpm

(c) 1173 rpm

(d) 1123 rpm

I have been asked this question during an online exam.

Origin of the question is Speed Control Using Field Control of Shunt Motor in division DC Motors of DC Machines

1 Answer

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Correct option is (b) 1273 rpm

Explanation: Speed regulation is equal to 0.1 which is also equal to (no-load – full load speed) divided by full load speed. Thus, by substituting all known quantities we get full load speed = 1400/1.1 = 1272.7 rpm so, speed equal to 1273 rpm.

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