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Electrical Machines

Electrical Machines
Iron losses in a DC machine are independent of variation in

 speed.
  voltage.
  speed and voltage.
  load.

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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
For a practical synchronous motor the pull out torque will occur when the torque angle is nearly equal to

 30°.
 45°.
  75°.
 0°.

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Electrical Machines
Star - delta method of starting of motor is not possible in case of

  high speed motor.
  single phase induction motor.
  low horse power motor.
  high torque motor.

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Electrical Machines
Which of the following motors has negative speed regulation?

 Differential compound motors.
 Shunt motors.
 Both B and C.
 Series motors.

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Electrical Machines
The emf induced in the dc generator armature winding is

 AC
 DC
None of these
 AC and DC

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MORE MCQ ON Electrical Machines

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