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Electrical Machines

Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.5.
  1.0.
  0.1.
  0.05.

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Electrical Machines
In an auto transformer, for what value of turn ratio, power transferred by inductively and conductively are same?

 any of the above
 1
 0.5
 0

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Electrical Machines
Dynamic braking is employed to brake

 non reversing drive
None of these
 reversing drive
 both 1 and 2

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Electrical Machines
Star - delta method of starting of motor is not possible in case of

  low horse power motor.
  high torque motor.
  single phase induction motor.
  high speed motor.

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Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  make noise.
  not run.
  run normally.
  get over heated.

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

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

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