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Electrical Machines

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

 20 ppm.
 25 ppm.
  35 ppm.
 45 ppm.

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Electrical Machines
In field flux method speed control of DC Motor is

 constant hp drive below the base speed.
 constant power drive above base speed.
 constant torque drive below the base speed.
 constant torque drive above the base speed.

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Electrical Machines
As compared to DOL starting, a cage induction motor with star-delta starting shall have

 more starting torque.
 smoother acceleration.
 more starting time.
 reduced starting current.

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Electrical Machines
In a three phase slip-ring induction motor, brushes are connected to

  3 - Φ AC supply.
  external star-connected resistors.
  equalizing coils.
  DC supply.

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Electrical Machines
When operating, two or more transformers in parallel, % impedance of these transformers should be

 such that actual impedance of all transformers would be same.
 proportionate to MVA rating of transformers.
  same.
 inversely proportional to MVA rating of transformers.

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Electrical Machines
If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is

 (1/2)Fmax.
 3Fmax.
  (3/2)Fmax.
 Fmax.

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