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Electrical Machines

Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 2HZ
 2.5Hz
 1 Hz
 50Hz

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Electrical Machines
A large series motor is never started without some mechanical load on it because otherwise it will

 draw too much current.
 develop excessive speed and damage itself.
 produce sparking at brushes.
 open fuse or circuit breaker.

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Electrical Machines
In escalator which motor is used?

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

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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 10%
 reduced by 20%
 increased by 20%

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Electrical Machines
The rotor slots are slightly skewed in squirrel cage induction motor to

 increase the strength of rotor bars.
 reduce the magnetic hum and locking tendency of rotor.
 decrease the amount of copper to be used.
 provide ease of fabrication.

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Electrical Machines
Rotor resistance speed control is used in

 squirrel cage induction motor.
 synchronous motor.
 slip ring induction motor.
 dc shunt motor.

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