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Electrical Machines

Electrical Machines
If direct axis reactance Xd and quadrature axis reactance Xq are equal, then reluctance power is

 zero
 maximum
All of these
 minimum

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Electrical Machines
In Ward-Leonard system, the lower limit of the speed imposed by

 Armature resistance.
 None of above.
 Residual magnetism of the generator.
 Field resistance.

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Electrical Machines
A synchronous motor will deliver maximum power when

  load angle is 0°.
  load angle is equal to internal angle θ.
  input power factor is unity.
  load angle is 45°.

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Electrical Machines
Stepper motor is used in

 traction
 computer printers
 food processing
All of these

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Electrical Machines
A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be

 50 W
 112.5 W
 75 W
 168.75 W

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Electrical Machines
If the number of rotor slots is equal to number of stator slots, then motor refuses to start. Hence it is known as

  cogging.
  relative speed.
  crawling.
  air gap.

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MORE MCQ ON Electrical Machines

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