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.

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

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Electrical Machines
The coil spam

 must be exactly equal to people pitch.
  may or may not be exactly equal to people pitch.
 can never be equal to pole pitch.
 none of above.

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Electrical Machines
Cogging in induction motor occurs when

 number of stator teeth - number of rotor teeth = negative number.
 number of stator teeth - number of rotor teeth = even number.
 number of stator teeth - number of rotor teeth = 0.
 number of stator teeth - number of rotor teeth = odd number.

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