Electrical Machines
A 6 pole lap connected DC generator with 480 conductors has armature resistance of 0.06 Ω. If the conductors are reconnected to from a wave winding other things remaining unchanged, the value of armature resistance will be

 0.06 Ω.
 0.54 Ω.
 0.01 Ω.
  0.54 Ω.

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Electrical Machines
The synchronous motor can be started by

  coupling it with a DC compound motor.
  any of the above methods.
  providing damper winding in its rotor circuit.
  coupling it with a small AC induction motor called the pony motor.

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Electrical Machines
Cogging in induction motor occurs when

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

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