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Electrical Machines

Electrical Machines
What is the increase in the torque expressed as percentage of initial torque, if current drawn by the dc series motor is increased from 10A to 11A?

 41%
 21%
 10%
 11%

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Electrical Machines
When excitation is increased (over excitation), the synchronous generator operates at

 leading power factor.
 lagging power factor.
 any of the above.
 unity power factor.

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

 Cumulative compound motors
 Shunt motor
 Differential compound motor
 Series motor

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Electrical Machines
For high current and low voltage rating which winding is employed to DC machine?

 Wave winding.
 Both wave and lap winding.
 No wave and lap winding.
 Lap winding.

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Electrical Machines
Maximum allowable acidity level of power transformer insulating oil is generally taken as

  0.3 mg of KOH / gm.
  1 mg of KOH / gm.
 2 mg of KOH / gm.
 0.5 mg of KOH / gm.

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Electrical Machines
Dissolve gas analysis of transformer oil is carried out to determine

 condition of transformer oil.
  condition of transformer.
 condition of bushing stud.
 condition of bushings.

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