Electrical Machines
A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

  33.33 Amp.
  43 Amp.
 29 Amp.
 44.47 Amp.

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Electrical Machines
Cogging and crawling are phenomena associated with

 the former during starting and the latter at a fraction of its rated speed.
 the former at a fraction of its rate speed and the latter during starting.
 cage induction machines and they are essentially the same.
 any of the above.

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