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Electrical Machines

Electrical Machines
At the instant of starting, the per unit slip of 3 - Φ induction motor is

  0.1.
  1.0.
  0.5.
  0.05.

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Electrical Machines
As compared to DOL starting, a cage induction motor with star-delta starting shall have

 reduced starting current.
 more starting torque.
 more starting time.
 smoother acceleration.

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Electrical Machines
Unbalance 3 - Φ stator currents cause

  heating of rotor.
  double frequency currents in the rotor.
All of these
  vibrations.

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Electrical Machines
Transformer core is laminated to reduce

 copper loss.
 hysteresis loss.
 eddy current loss.
 both 1 and 2.

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Electrical Machines
To get the speed of DC motor more than normal without wastage of electrical energy _____________ is used.

 none of above.
 any of above method.
 Ward Leonard control.
 rheostatic control.

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Electrical Machines
A 100/10, 50 VA double winding transformer is converted to 100/110 V auto transformer. The rating of auto transformer is

 100 VA
 500 VA
 110 VA
 550 VA

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