A dc shunt motor is driving a constant torque load with normal excitation. If the filed current is halved then the motor will run at 

  • ARated speed
  • BHalf of rated speed 
  • CDouble of rated speed
  • DSlightly less than double the rated speed
Correct Answer : (D)

Slightly less than double the rated speed

Hints :

The current drawn by a 120 V dc motor with back emf of 110 V and armature resistance of 0.4 ohm is


With the increase in speed of a dc motor

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