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Electrical Machines

Electrical Machines
Total core loss is also called as -------------?

 Hysteresis loss
 Eddy current loss
 Magnetic loss
 Copper loss

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Electrical Machines
Skewing of cage rotors offers the following advantages

  less noise.
  locking tendency is reduced.
  all of below.
  uniform torque.

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Electrical Machines
What happens if fifth multiples of harmonics is given to induction motor?

  Fail to start.
  It will rotates in reverse direction.
  It will rotates in normal operation.
  Either short circuit or open circuit occurs.

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Electrical Machines
An inverted V-curve of synchronous motor shows the variation of

 power factor and dc excitation at constant load
All of these
 power factor and supply voltage during hunting
 supply voltage and field current at constant excitation

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Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 28 W.
 30 W.
 36 W.
 25 W.

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Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 same.
 less than 50%.
 between 50% and 90%.
 more.

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MORE MCQ ON Electrical Machines

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