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If the no load speed of DC motor is 1300 rpm and full load speed is 1100 rpm, then its voltage regulation is ____________

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If the no load speed of DC motor is 1300 rpm and full load speed is 1100 rpm, then its voltage regulation is ____________

(a) a. 12.56%

(b) b. 18.18 %

(c) c. 17.39%

(d) d. 18.39%

I have been asked this question in my homework.

My enquiry is from EMF and Torque Production topic in section Circuit Model, Emf and Torque of DC Machines

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Correct answer is (b) b. 18.18 %

For explanation I would say: For A DC machine when all other parameters are fixed average coil emf generated is proportional directly to the speed of the dc motor. Voltage regulation is defined as ratio of difference of no load voltage and full load voltage to the full load voltage. VR= (1300-1100/1100)*100%.

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