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Electrical Machines

Electrical Machines
Slip exists in

  induction motor.
  in both machines.
  none of above.
  synchronous motor.

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Electrical Machines
The principle of operation of a 3 - Φ induction motor is almost similar to that of

  capacitor start induction motor.
  repulsion start induction motor.
  synchronous motor.
  transformer with secondary short circuited.

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Electrical Machines
Number of tappings for each equalizer ring is equal to

  number of poles.
  number of parallel paths.
  number of commutator segments.
  number of pole pairs.

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Electrical Machines
Which of the following machines have highest power factor with respect to magnetizing current?

 Any of the above.
 Closed slot type machines.
 Open slot type machines.
 Semi closed slot type machine.

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Electrical Machines
What does happen if tripled harmonics given to induction motor?

  Will results in short circuit.
  Will results in open circuit.
  Nothing will happen.
  Fail to start.

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Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 sinusoidal
 flat-topped
 rectangular
 co- sinusoidal

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MORE MCQ ON Electrical Machines

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