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Electrical Machines

Electrical Machines
Eddy current loss will depends on

 Flux density
All of these
 Frequency
 Thickness

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Electrical Machines
Eb/V ratio of a DC motor is an indication of

  Effiency.
 Speed regulation.
 Starting torque.
 Running Torque.

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Electrical Machines
In salient pole synchronous machine, maximum power occurs at a load angle of

 90°
 0°
 less than 90°
 Greater than 90°

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Electrical Machines
Which of the following methods of speed control is not affected through stator side?

  Change of rotor resistance.
  Change of supply frequency.
  Change of number of pole.
  Change of supply voltage.

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Electrical Machines
Compensating windings is placed in which part of a D.C motor?

None of these
 On yoke in the inter pole gap.
  On yoke in the pole faces.
 On armature.

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Electrical Machines
If Ke is eddy current constant, Kf is form factor, f is supply frequency, Bm maximum flux density in core of transformer, the expression of eddy current loss in transformer, is given by

  Kef2Kf2Bm2.
 Kef2KfBm2.
 KefKf2Bm2.
 Kef2Kf2Bm.

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MORE MCQ ON Electrical Machines

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