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

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Electrical Machines
Unbalance 3 - Φ stator currents cause

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

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Electrical Machines
Armature reaction depends on which of the following?

 magnitude of load current
 both 1 and 2
None of these
 power factor of load

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Electrical Machines
Capacitor in split phase induction motor is used to

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

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Electrical Machines
What is the actual arrangement of series wound generator?

 Armature and field both are parallel.
  Armature and field both are in series with the load.
 Armature and field both are connected.
 Armature winding is in series with load.

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Electrical Machines
For 250 volt DC Shunt Motor the armature and field resistance are 0.5 ohm and 250 ohm respectively. What will be the back e.m.f. produced when it takes a load current of 21A.

 150 V.
 240 V.
 280 V.
 220 V.

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MORE MCQ ON Electrical Machines

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