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Electrical Machines

Electrical Machines
Example of double excited machine is

 Both are correct.
 Synchronous motor.
 DC Shunt Motor
None of these

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Electrical Machines
An auto transformer having a transformation ratio of 0.8 supplies a load pf 10 KW. The power transfered inductively from the primary to secondary is

 0.
 8 KW.
 10 KW.
  2 KW.

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Electrical Machines
Transformers operating in parallel will share the load depending upon their

 leakage reactance.
 efficiency.
 rating.
 percentage impedance.

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Electrical Machines
In DC shunt motor if load is increased, the speed

 remains constant.
 reduce slightly.
 increase proportional.
 increased slightly.

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Electrical Machines
A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be

 75 W
 168.75 W
 50 W
 112.5 W

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Electrical Machines
Which of the following motor used in hair dryers?

  Synchronous motors.
  Cage induction motor.
  Split phase IM.
  Shaded pole IM.

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