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Electrical Machines

Electrical Machines
Universal motor have which of the following application?

  Lift.
  Domestic pump.
  Traction.
  Food mixer.

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Electrical Machines
The power factor of squirrel cage induction motor is

 low at light loads only
 low at heavy loads only
 low at rated load only
 both A and B

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Electrical Machines
The total core loss of a 400 V, 50 Hz transformer is 2400W, when it is supplied by 200 V, 25 Hz loss is 800W. Calculate eddy current loss and hysteresis loss?

 1000W , 1400W
 1400W, 1000W
 800W, 1600W
 1600W, 800W

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Electrical Machines
The overall power factor of an on load transformer

 is always lagging.
 is always leading.
  depends on the power factor of the load.
 is always unity.

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Electrical Machines
In which of the following DC Motor the ratio of starting torque to full load torque is minimum?

  Shunt motor.
  Cumulative compound motor.
  Differential compound motor.
  Series motor.

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Electrical Machines
Drop in speed from no load to full load is very high in

 Cummulative compound motor with interpoles.
  Series motor without interpoles.
 Shunt motor with interpoles.
 Series motor with interpoles.

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