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Electrical Machines

Electrical Machines
Armature reaction in dc motor results

  open circuit.
  increase in speed.
  short circuit.
  decrease in speed.

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Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  1.0.
  0.1.
  0.05.
  0.5.

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Electrical Machines
In a DC generator the emf generated by the armature is maximum when

 induced voltage is high.
 shaft rotation is high.
 rate of change of flux is minimum.
  rate of change of flux is maximum.

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Electrical Machines
To have sparkless commutation, the armature reaction effect in a DC machine is neutralized by

 increasing field excitation.
 fixing the brush axis inline with the pole axis.
 shifting the brush axis from GNA to MNA.
  compensating winding and commutating poles.

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Electrical Machines
DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

 Heavy sparking at brushes.
 Both of above.
 Heavy sparking at the first stud of starting resistance steps.
 None of these.

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Electrical Machines
Ward-Leonard control is basically a ___________ control method.

 Armature resistance control.
 Armature voltage control.
 Field diverter control.
 Field control.

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MORE MCQ ON Electrical Machines

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