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Electrical Machines

Electrical Machines
If input of a transformer is square wave the output will be

 square wave.
 sine wave.
  pulsed wave.
 triangular wave.

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Electrical Machines
Which of the following statements are correct ?

 Both 1 and 2.
None of these
 A small value of leakage reactance will increase the maximum power output of motor.
 The leakage reactance of the induction motor should be small.

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Electrical Machines
The principle of operation of a 3 - Φ induction motor is almost similar to that of

  transformer with secondary short circuited.
  repulsion start induction motor.
  capacitor start induction motor.
  synchronous motor.

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Electrical Machines
The low voltage winding of a 400/230 V single phase 50 Hz transformer is to be connected to keep the magnetization current at the same level in both the cases the voltage at 25 Hz should be

 115 V
 460 V
 230 V
 65 V

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Electrical Machines
In DC generator, lap winding is used in

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

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Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 2
 3 or 4
 0
 1

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