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Electrical Machines

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

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

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Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

 Less than 50 %
 Around 90 %
 Around 100 %.
 Any where between 75 % and 90 %.

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Electrical Machines
On switching a DC motor to DC supply mains, it is found to rotate in the direction opposite to that for which it is designed. The DC motor is

 have an equal number of electrons and protons.
  Differentical compound.
 Cummulative compound.
 Series shunt.

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Electrical Machines
An IM cannot run at synchronous speed because

  induction motor will become synchronous motor.
  air friction will prevent it.
  none of above.
  rotor torque will not be produced.

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Electrical Machines
The armature of DC motor is laminated

 to reduce the eddy current loss.
 to reduce the mass.
 to reduce the inductor.
 to reduce the hysteresis loss.

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Electrical Machines
Which of the following induction motor has maximum speed?

 8 pole.
 6 pole.
 4 pole.
  2 pole.

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MORE MCQ ON Electrical Machines

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