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Electrical Machines

Electrical Machines
Hunting phenomenon is observed in which motor?

  Synchronous motor.
 DC motor.
 Induction motor.
 Both A and C.

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Electrical Machines
Reactive power generated or delivered significantly depends on

 frequency.
 load angle.
 both 1 and 2.
 excitation.

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Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 200 V.
 460 V.
 115 V.
 230 V.

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Electrical Machines
A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to

 1/Ia
 Ia2
 Ia
 I/Ia2

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Electrical Machines
If the handle of a three point starter goes to back to OFF position, it may be due to

 all of these.
 zero or very low voltage supply.
 over load.
 high filed circuit resistance.

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Electrical Machines
During no load test, an induction motor draws power

  only for the small copper loss.
  for core loss and windage and friction loss.
  for core loss and copper loss.
  for copper loss and windage friction loss.

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MORE MCQ ON Electrical Machines

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