In a dc motor, if armature current is increased, keeping field current constant, the torque developed will 

  • ARemain unchanged
  • BDecrease in inverse proportion
  • CIncrease proportionately
  • DIncrease I proportion to the square of the armature current
Correct Answer : (C)

Increase proportionately

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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