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Electrical Machines

Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

 45 ppm.
  35 ppm.
 20 ppm.
 25 ppm.

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Electrical Machines
What will be the eddy current loss if the supply frequency of a transformer becomes double?

 Four times.
 Remains same.
 Eight times.
 Doubled.

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Electrical Machines
The current drawn by a DC motor at the time of starting is

 Very high.
 Very low.
 Zero.
 Normal.

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Electrical Machines
The efficiency of a transformer is mainly dependent on

 core losses.
 stray losses.
 dielectric losses.
 copper losses.

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Electrical Machines
In a transformer which of the following losses are zero?

 Iron loss
 Copper loss
 Rotational loss
All of these

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Electrical Machines
If the field winding connection of DC shunt motor is changed

 motor will become slow.
 motor will not run.
 It will run in same direction.
  It will run in opposite direction.

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