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Electrical Machines

Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 V
 f
 V²
 f²

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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

 to avoid locking of the armature.
All of these
 to avoid over heating.
 to achieve a stronger magnetic field.

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Electrical Machines
Value of specific electric loading of Induction motor is in the range of

  5000 - 45000 ampere conductor / metre.
  400 - 4000 ampere conductor / metre.
 40 - 400 ampere conductor / metre.
 30000 - 100000 ampere conductor / metre.

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Electrical Machines
If an additional resistance is connected in series with a DC motor operating at rated speed, the speed of the motor will

  Increase.
  Oscillate around the normal speed.
  Reduce.
  Remain unaltered.

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

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

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Electrical Machines
In which of the following speed control of DC motor the speed obtained is below than the rated speed?

 Armature circuit resistance control.
 Armature voltage control.
 Any of above.
 Field resistance control.

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MORE MCQ ON Electrical Machines

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