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Electrical Machines

Electrical Machines
In a synchronous motor, damper windings are provided on

  stator frame.
  pole faces.
None of these
  rotor shaft.

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Electrical Machines
In a DC generator sparking between brushes and commutator surface may be due to

  too rapid reversal of current.
 over commutation.
  any of the above.
  under commutation.

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Electrical Machines
In above questions, find the power delivered by each of the alternators to a load of impedance 6Ω(resistive)

  3190 W, 5040 W.
 6000 W, 7000 W.
 100 W, 2000 W.
 1000 W, 5040 W.

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Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

 V2
 V
 f2
 f

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Electrical Machines
Hysteresis loss will depends on

 f
 f³
 f²
 f1.6

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Electrical Machines
A DC generator beyond critical resistance will generate

 maximum voltage.
 maximum current.
 no voltage.
 maximum power.

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MORE MCQ ON Electrical Machines

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