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Electrical Machines

Electrical Machines
At stand still condition the value of slip is

 0
 finite value
 1
 infinite value

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Electrical Machines
The squirrel cage induction motors are provided with blades in order to

  balance the rotor dynamically.
  none of these.
  facilitate cooling of rotor.
  eliminate noise.

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Electrical Machines
What is the full form of MNP?

  Magnetic field neutral pole.
  Magnetic neutral pole.
  Magnetic neutral plane.
  Magnetic field neutral plane.

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Electrical Machines
If an AC servomotor has one of its winding excited by AC, then voltage measured at the other winding with rotor running will be

 proportional to square of rotor speed.
  proportional to rotor speed.
 constant independent of speed.
 zero.

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Electrical Machines
Speed of DC motor can be controlled by varying

 its flux oer pole.
 resistance of armature culture.
 applied voltage.
 all of these.

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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
 112.5 W
 50 W
 168.75 W

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