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Electrical Machines

Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 600 W
 650 W
 700 W
 625 W

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Electrical Machines
For successful parallel operation of two single phase transformers, the most essential condition is that their

 percentage impedances are equal
 turn- ratios are exactly equal
 KVA ratings are equal
 polarities are properly connected

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Electrical Machines
What is power factor of a 3 - φ induction motor at no load?

  Same as full load.
  High.
  Equal to 1.
  Low.

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Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 low and low
 high and high
 low and high
 high and low

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Electrical Machines
Reluctance and hysteresis motors are the types of which electrical motor?

 DC motor.
 Stepper motor.
 3 - Φ induction motor.
  1 - Φ synchronous motor.

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Electrical Machines
The constant losses in transformer is/are

 hysteresis loss.
 both 2 and 3.
 copper loss.
 eddy current loss.

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