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

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in DC Machines by (506k points)
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

This question was posed to me in homework.

Question is from DC Motor Basics -1 in chapter DC Motors of DC Machines

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Correct option is (c) The armature may burn

The explanation is: 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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