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Electrical Machines

Electrical Machines
The output power of a dc motor is given by

  none of these.
  EbIa2.
  EIa.
  EbIa.

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Electrical Machines
Direct axis reactance is defined as the ratio of

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

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Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?

 greater than
 less than
 equal to
 any of the above

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

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

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Electrical Machines
The magnetic circuit of a dc shunt generator with negligible armature resistance and brush contact voltage drop remains unsaturated when it delivers full-load current at rated terminal voltage. The brushes are kept in the interpolar axis and speed is maintained constant. When the load is switched off, the terminal voltage would

 decrease
 remain the same
 become zero
 increase

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Electrical Machines
A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor

  Decreases.
 Oscillates around the rated speed.
 Increases.
 Remains unchanged.

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