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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 50 Hz
 0 Hz
 1 Hz
 5 Hz

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Electrical Machines
If the mechanical angle α between the stator and rotor poles increases, then the stator current

 Decreases.
 Remains unchanged.
 None of above.
  Increases.

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Electrical Machines
Iron losses in a DC machine are independent of variation in

  speed and voltage.
 speed.
  voltage.
  load.

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Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

 -3.33%
 +3.33%
 +3%
 -3%

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Electrical Machines
Slip exists in

  induction motor.
  in both machines.
  none of above.
  synchronous motor.

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Electrical Machines
To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be

 reduced by 10%
 increased by 20%
 reduced by 20%
 increased by 10%

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