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Electrical Machines

Electrical Machines
Equalizer rings are used in which of the followings?

 both 1 and 2
 wave winding
None of these
 lap winding

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is

  3000 rpm.
  600 rpm.
  500 rpm.
  3600 rpm.

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Electrical Machines
In escalator which motor is used?

  1 - φ IM.
  Universal motor.
  DC shunt motor.
  3 - φ IM.

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

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Electrical Machines
Speed of DC motor can be controlled by varying

 its flux oer pole.
 all of these.
 resistance of armature culture.
 applied voltage.

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Electrical Machines
Which of the following voltage regulation method is accurate ?

 American standard association method
 Synchronous impedance method
 MMf method
 ZPF method

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