Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will

 start haunting.
 run at very low speed.
 burn.
 run at very high speed.

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Electrical Machines
In a DC machine

 current and emf in armature are unidirectional
 emf in armature conductors and at the terminals is alternating.
 current and emf at the terminals are alternating.
 current and emf in armature are alternating.

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