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If the speed of a DC shunt motor is increased, the back emf of the motor will ___________

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If the speed of a DC shunt motor is increased, the back emf of the motor will ___________

(a) Increase

(b) Decrease

(c) Remain same

(d) Become zero

This question was posed to me in final exam.

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

1 Answer

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Best answer
The correct choice is (a) Increase

Explanation: From, the speed-current characteristics of DC shunt motor we know that speed of the motor is directly proportional to the back emf and inversely proportional to the flux. So, for more speed there will be more back emf generated.

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