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Electrical Machines

Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

 20.
 1.1.
  0.05.
  0.905.

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Electrical Machines
For a transformer to be tested at full load conditions but consuming only losses from the main, we do

None of these
 load test
 OC and SC tests
 back to back test

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Electrical Machines
In a transformer which of the following losses are zero?

 Rotational loss
 Iron loss
 Copper loss
All of these

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Electrical Machines
What will be the eddy current loss if the supply frequency of a transformer becomes double?

 Doubled.
 Remains same.
 Eight times.
 Four times.

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

 120°.
 60°.
 30°.
 90°.

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Electrical Machines
The rotor electromotive force of the IM is observed to make 100 complete alterations per minute, calculated slip

None of these
 0 .001 %.
  3.33 %.
 3 %.

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