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Electrical Machines

Electrical Machines
Direct axis reactance is defined as the ratio of

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

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Electrical Machines
Armature reaction in dc motor results

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

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Electrical Machines
To achieve spark less commutation brushes of DC generator are rocked ahead so as to bring them

 just behind the magnetic neutral axis.
 in magnetic neutral axis.
 just ahead of magnetic neutral axis.
None of these

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Electrical Machines
If starting current of a 3 - Φ induction motor is 5 times the rated current, while rated slip is 4 %, then ratio of starting torque to full load torque is

 0.4.
  1.
 0.6.
 0.8.

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Electrical Machines
Unbalance 3 - Φ stator currents cause

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

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Electrical Machines
Which of the following relation is correct?

None of these
 Xd > Xq.
 Xd < Xq.
 Xd = Xq.

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MORE MCQ ON Electrical Machines

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