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Electrical Machines

Electrical Machines
The constant losses in transformer is/are

 both 2 and 3.
 eddy current loss.
 copper loss.
 hysteresis loss.

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Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 120°.
 30°.
 60°.
 90°.

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Electrical Machines
The short circuit test on a transformer is conducted to obtain

  copper losses.
 core loses only.
 eddy current loss.
 hysteresis loss.

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Electrical Machines
When the mechanical power is developed by a DC motor maximum

 Back emf is equal.
 back emf is equal to applied voltage.
  Back emf is equal to half of applied voltage.
 None of above.

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Electrical Machines
The wattage rating of a ceiling fan motor will be

  50 - 150 W.
 250 - 500 W.
 10 - 20 W.
 200 - 250 W.

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Electrical Machines
In case of a dc motor the ratio Eb / E is indicative of

  ratio of input to output voltage.
  ratio of starting to running torque.
  efficiency.
  ratio of starting to running current.

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