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ELECTRICAL MACHINES

Electrical Machines
The application that need frequent starting and stopping is

  paper mills.
  blowers.
  jaw crushers.
  lifts and hoists.

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Electrical Machines
Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of

 2 / 3.
 5 / 6.
 6 / 7.
  4 / 5.

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Electrical Machines
In escalator which motor is used?

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

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

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

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Electrical Machines
In an induction motor, the no-load slip is generally equal to

  less than 1 %.
  zero.
 4 %.
 1.5 %.

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