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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

 1 Hz
 0 Hz
 50 Hz
 5 Hz

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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

None of these
 supply voltage
 rotor resistance
 supply frequency

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Electrical Machines
The synchronous speed of an induction motor will be increased by

  increasing number of poles.
  decreasing of frequency.
  increasing of frequency.
  speed can not be increased.

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Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 0 < S < 1
 0 < S < 2
 -2 < S < 2
 -1 < S < 1

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Electrical Machines
A 100/10, 50 VA double winding transformer is converted to 100/110 V auto transformer. The rating of auto transformer is

 550 VA
 500 VA
 110 VA
 100 VA

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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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