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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
 minimum
All of these
 maximum

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Electrical Machines
Unbalance 3 - Φ stator currents cause

All of these
  double frequency currents in the rotor.
  heating of rotor.
  vibrations.

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Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

None of these
 either GNA or MNA
 MNA
 GNA

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Electrical Machines
Hysteresis loop represents the area of

 copper loss
 hysteresis loss
 total iron losses
 eddy current loss

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Electrical Machines
A 400 V, 50 Hz, 30 Hp, three phase IM is drawing 50 A current at 0.8 p.f lagging. The stator and rotor copper losses are 1.5 KW and 900 W respectively. The friction and windage losses are 1050 W and core losses are 1200 W. The air gap power of the motor will be

 25 kW.
 26.21 kW.
 23.06 kW.
 24.11 kW.

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Electrical Machines
Which of following DC generator will be in a position to build up without any residual magnetism in the field?

  Compound.
 Shunt.
  Separately excited.
  Series.

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MORE MCQ ON Electrical Machines

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