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Electrical Machines

Electrical Machines
The output power of any electrical motor is taken from the

 Coupling mounted on the shaft.
 Motor frame.
 Armature.
 Field.

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Electrical Machines
If the field of a dc shunt motor gets opened while the motor is running, then the

 armature will oscillate about original speed as the mean speed
 armature current will drop
 motor will become slow.
 motor will attain dangerously high speed

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Electrical Machines
Slip exists in

  none of above.
  induction motor.
  synchronous motor.
  in both machines.

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Electrical Machines
Exciting current of an induction motor is

  equal as power transformer.
  none of these.
  lesser than power transformer.
  higher than power transformer.

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Electrical Machines
Transformer cooling and insulating oil must be of

 high viscosity.
  low viscosity.
 low resistivity.
 low BDV.

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Electrical Machines
In above questions, find the power delivered by each of the alternators to a load of impedance 6Ω(resistive)

 100 W, 2000 W.
  3190 W, 5040 W.
 6000 W, 7000 W.
 1000 W, 5040 W.

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