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Electrical Machines

Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 20KVA
 0KVA
 16KVA
 4KVA

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

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

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Electrical Machines
A 4 pole, 3-phase induction motor is running at 4% slip at full load. If the speed of the motor is 720 rpm, the supply frequency is

 25 Hz
 50 Hz
 60 Hz
 40 HZ

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Electrical Machines
In diesel engine, gas engine type of machine contains ___________________ pole type of alternator.

 non uniform cylindrical.
 cylindrical.
  salient.
 none of these.

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Electrical Machines
Which motors are preferred for refrigeration and air conditioning in smaller units?

  Induction motors.
  Stepper motors.
  Reluctance motors.
  Universal motors.

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Electrical Machines
Which of the following windings are necessary in case of all dc machines?

 lap winding
 closed winding
 wave winding
 open type winding

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