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Electrical Machines

Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 less than 50%.
 more.
 same.
 between 50% and 90%.

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Electrical Machines
Consider a separately excited DC motor. If the field current is increased while the armature terminal voltage is held constant, then speed of the motor

 None of these.
 Remains same.
 Increase.
  Decrease.

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Electrical Machines
Armature reaction of an unsaturated DC machine is

 demagnetising.
  none of above.
  crossmagnetising.
  magnetising.

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Electrical Machines
Capacitor in split phase induction motor is used to

 improve the starting torque.
 start the motor.
 improve the power factor.
 reduce the harmonics.

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is

  3000 rpm.
  600 rpm.
  500 rpm.
  3600 rpm.

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Electrical Machines
Brushes are always placed on--------------- , in order to achieve sparkles commutation?

 GNA
 either GNA or MNA
None of these
 MNA

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