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Electrical Machines

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

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

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Electrical Machines
A smaller air gap in a polyphase induction motor helps to

  reduce the chance of cogging.
  reduce the chance of crawling.
  reduce the magnetizing current.
  increase the starting torque.

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Electrical Machines
A differentially compound motor under high-over-load conditions will behave like a / an

 shunt motor.
  series motor.
 AC synchronous motor.
 cummulative compound motor.

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Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will

 run at very low speed.
 start haunting.
 burn.
 run at very high speed.

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Electrical Machines
The no load current in a transformer lags the applied voltage by

  about 75°.
 90°.
 0°.
 about 115°.

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Electrical Machines
The inertia constant H of a synchronous condenser is

 greater than that of turbo alternator.
 equal to that of the effective length of the line.
  none of these.
 greater than that of hydro generator.

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