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Electrical Machines

Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 leading
 unity
 lagging
 zero

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Electrical Machines
Current in a coil undergoing commutation is not able to get reversed completely by the end of commutation period. It is due to

 armature emf.
None of these
  reactance voltage induced in the coil.
  coil resistance.

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Electrical Machines
The condition for maximum running torque is

 R = S.X
 0.5 lagging
 unity
 0.707 lagging
 zero

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Electrical Machines
Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of

 6 / 7.
  4 / 5.
 5 / 6.
 2 / 3.

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Electrical Machines
Which of the following motors is/are widely used?

 slip ring induction motor
None of these
 either of these
 squirrel cage induction motor

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Electrical Machines
Reactive power generated or delivered significantly depends on

 load angle.
 frequency.
 excitation.
 both 1 and 2.

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