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Electrical Machines

Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 30 W.
 25 W.
 28 W.
 36 W.

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Electrical Machines
In a 3-phase induction motor, if the supply voltage and frequency are reduced by the same ratio, then slip at which maximum torque occurs is

 more and maximum torque decreases
 less and maximum torque increases
 more and maximum torque remains constant
 less and maximum torque decreases

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 96%
 95%
 94%
 92%

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Electrical Machines
Breather is provided in a transformer to

 filter the transformer oil.
  absorb moisture of air during breathing.
 provide cold air in transformer.
 absorb moisture from air entering in transformer.

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

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

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Electrical Machines
Which of these types of motor is self starting?

  None of these.
  Poly-phase induction motor.
  Single phase induction motor.
  Poly-phase synchronous machine.

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