A series motor is working drawing a load current of 1A from the line if now the load is reduced such that the current drawn is halved, the speed of the machine (neglecting the saturation and armature resistance) would be 

  • Aunchanged
  • Breduced by 50%
  • Creduced by 100%
  • Dincreased by 100%
Correct Answer : (D)

increased by 100%

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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