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Electrical Machines

Electrical Machines
Which of the following is the largest conversion device?

 Synchronous machine
All of these
 DC machine
 Induction machine

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Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

 1000.
 500.
 0.
 2000.

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

  0.1.
  0.05.
  0.5.
  1.0.

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Electrical Machines
In DC generator, lap winding is used in

 high voltage and low current applications.
  high current and low voltage applications.
 where constant speed is required.
 where greater load is connected.

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Electrical Machines
Exciting current of an induction motor is

  equal as power transformer.
  higher than power transformer.
  lesser than power transformer.
  none of these.

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Electrical Machines
In a synchronous motor electromagnetic power varies

 directly as square of applied voltage
 directly as applied voltage
None of these
 inversely as applied voltage

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