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Electrical Machines

Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

 20.
 1.1.
  0.05.
  0.905.

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Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 √3
 3
 1/3
 1/√3

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Electrical Machines
The speed of rotation of 5th harmonic component in the stator of an induction motor is

 5 times the synchronous speed.
  0.5 times the synchronous speed.
  (1 / 5) times the synchronous speed.
 (1 / 15) times the synchronous speed.

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Electrical Machines
The frame of an induction motor is made of

  stainless steel.
  aluminium.
  closed grained cast iron.
  silicon steel.

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Electrical Machines
In which of the following motors DC excitation is not required?

 reluctance motor
 3-phase synchronous generator
 hysteresis motor
 3-phase synchronous motor

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Electrical Machines
Air core transformer as compared to iron core transformer, has

 more magnetic core loss.
  more copper loss.
 less magnetic core loss.
  no magnetic core loss.

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