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Electrical Machines

Electrical Machines
Reactive power generated or delivered significantly depends on

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

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Electrical Machines
Which of the following DC Motor requires 3 point starter?

  Shunt motor.
  Series motor.
  Shunt motor as well as compound motors.
  Shunt, compound and series motor.

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Electrical Machines
High starting torque and low starting current is the advantage of

  stepper motor.
  slip ring induction motor.
  squirrel cage induction motor.
  hysteresis motor.

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Electrical Machines
Eb/Vt ratio of a DC motor is an indication of

 efficiency.
 speed regulation.
 running torque.
 starting torque.

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Electrical Machines
In induction motor when the length of the air gap is increased, the magnetizing current of the motor increases while the short circuit current __________________.

 kept constant to certain value.
 decreased.
 increased.
  remains unchanged.

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Electrical Machines
In a DC generator the emf generated by the armature is maximum when

  rate of change of flux is maximum.
 induced voltage is high.
 shaft rotation is high.
 rate of change of flux is minimum.

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