DC Motors
The back emf in a dc motor ______

None of the listed here
Opposes the applied voltage
Aids the armature current
Aids the applied voltage

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DC Motors
If a D.C. shunt motor is working at no load and if shunt field circuit suddenly opens

Nothing will happen to the motor
This will make armature to take heavy current, possibly burning it
This will result in excessive speed, possibly destroying armature due to excessive centrifugal stresses
Motor will run at very slow speed

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