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No load speed of the DC shunt motor is 1322 rpm while full load speed is 1182 rpm. What will be the speed regulation?

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No load speed of the DC shunt motor is 1322 rpm while full load speed is 1182 rpm. What will be the speed regulation?

(a) 12.82 %

(b) 11.8 %

(c) 16.6 %

(d) 14.2 %

This question was posed to me in a national level competition.

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

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The correct option is (b) 11.8 %

For explanation: Speed regulation is equal to (No-load speed – Full load speed) / (Full load speed). By substituting all the values, speed regulation= (1322-1182)/ 1182. Speed regulation is given by 0.118. In percentage notation SR= 11.8 %.

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