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Electrical Machines

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

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

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Electrical Machines
Dummy coils are used for

All of these
 increasing efficiency.
 mechanical balancing.
 reducing armature reaction.

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Electrical Machines
Crawling in an induction motor is due to

  slip ring rotor.
  time harmonics in supply.
  insufficient starting torque.
  space harmonics produced by winding currents.

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Electrical Machines
A DC shunt generator builds up 230 V when driven in clockwise direction. In case it is driven in anti clockwise direction, other things remaining unchanged, then the voltage build up is

 some what less than 230 V
 some what more than 230 V
 230 V
 not possible

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Electrical Machines
A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is

 5%
 25%
 4%
 2%

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Electrical Machines
Exciting current of an induction motor is

  lesser than power transformer.
  higher than power transformer.
  equal as power transformer.
  none of these.

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MORE MCQ ON Electrical Machines

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