The armature shaft must be able to withstand 

  • AAny unbalanced magnetic pull on the armature core
  • BTwisting strains due to transmission of torque 
  • CBending moment due to weight of the armature and commutator
  • DAll of the above 
Correct Answer : (D)

All of the above 

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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