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Electrical Machines

Electrical Machines
Quadrature axis synchronous reactance is the ratio of

 Vmax to Imin.
 Vmin to Imax.
 Vmax to Imax.
 Vmin to Imin.

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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

 168.75 W
 112.5 W
 75 W
 50 W

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Electrical Machines
For a practical synchronous motor the pull out torque will occur when the torque angle is nearly equal to

  75°.
 0°.
 45°.
 30°.

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Electrical Machines
A commutator in dc machine provide ----------------- rectification?

 half wave controlled
 full wave controlled
 half wave
 full wave

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Electrical Machines
In a DC generator in case the brushes are moved so as to bring them in magnetic neutral axis, then, there will be

  none of above.
  cross-magnetization as well as demagnetization.
 demagnetisation.
  cross-magnetisation.

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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

  air gap.
  cogging.
  relative speed.
  crawling.

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MORE MCQ ON Electrical Machines

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