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Electrical Machines

Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

 0.3.
 0.7.
  1.
  0.54.

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Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 f
 f²
 V
 V²

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Electrical Machines
_____________ types of induction motor are widely used.

  Single phase IM.
  Three phase IM.
  Squirrel cage IM.
  Slip ring IM.

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Electrical Machines
A flat compound generator is obtained from compound generator by connecting a variable resistor

 in parallel with the shunt field
 in series with the series field
 in parallel with the series field
 in series with the shunt field

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Electrical Machines
The material used for commutator brushes is mostly

 mica.
 cast iron.
 copper.
  carbon.

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Electrical Machines
The total core loss of a 400 V, 50 Hz transformer is 2400W, when it is supplied by 200 V, 25 Hz loss is 800W. Calculate eddy current loss and hysteresis loss?

 1400W, 1000W
 1600W, 800W
 1000W , 1400W
 800W, 1600W

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