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Electrical Machines

Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 0 V
 4 V
 2 V
 1 V

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Electrical Machines
A load of 900 lbs is to be raised with a lift car weighting 855 lbs at a speed of 110 feet per minute, the over balance being 40 % and percentage efficiency 45 %. Find the horse power of the motor without counterweight

  150.
 180.
 160.
 170.

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Electrical Machines
When excitation is increased (over excitation), the synchronous generator operates at

 any of the above.
 leading power factor.
 unity power factor.
 lagging power factor.

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Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  not run.
  run normally.
  get over heated.
  make noise.

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Electrical Machines
When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop

  induction generator torque.
  DC motor torque.
  induction motor torque.
  synchronous motor torque.

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Electrical Machines
Induction motors provided with open slots have

  more breakdown torque.
  higher efficiency.
  less breakdown torque.
  leading power factor.

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