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Electrical Machines

Electrical Machines
In a synchronous motor, damper windings are provided on

  stator frame.
  pole faces.
  rotor shaft.
None of these

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Electrical Machines
If the field winding connection of DC shunt motor is changed

 motor will not run.
  It will run in opposite direction.
 It will run in same direction.
 motor will become slow.

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Electrical Machines
A smaller air gap in a polyphase induction motor helps to

  reduce the chance of cogging.
  reduce the chance of crawling.
  reduce the magnetizing current.
  increase the starting torque.

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Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 V
 f²
 V²
 f

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Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

 6.
 4.
  8.
  2.

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Electrical Machines
In DC generators, the brushes remain in contact with conductors which

 there is no hard and fast rule for this.
 lie in the inter polar gaps.
 lie under south pole.
 lie under north pole.

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MORE MCQ ON Electrical Machines

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