What will happen if the back emf of a DC motor vanishes suddenly?

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Mr. Dubey

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📊 Electrical Drives and Controls (EDC)

Q. What will happen if the back emf of a DC motor vanishes suddenly?

(A) the motor will stop
(B) the motor will continue to run
(C) the armature may burn
(D) the motor will run noisy

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✅ Correct Answer: (C) the armature may burn

Explanation: if back emf vanishes suddenly, motor circuit will try to retain back emf by drawing more current from supply. if supplying unit didn’t trip down by this time, excess current in armature may heat up the armature.

Explanation by: Mr. Dubey

if back emf vanishes suddenly, motor circuit will try to retain back emf by drawing more current from supply. if supplying unit didn’t trip down by this time, excess current in armature may heat up the armature.

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