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Electrical Machines

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
If starter is not used with large DC motor for starting, it will

 damage the armature and commutator.
 all of above.
 provide execessive voltage drop in line.
 draw a starting current many times its rated full load current.

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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.
 160.
 170.
 180.

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Electrical Machines
Which of the following motor is used in grinders?

  Synchronous motor.
  Split phase IM.
  Capacitor start IM.
  Capacitor start capacitor run IM.

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Electrical Machines
The dc motor which can provide zero speed regulation at full load without any controller, is

 series.
 cumulative compound.
 differential compound.
 shunt.

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Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will

 run at very high speed.
 burn.
 start haunting.
 run at very low speed.

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MORE MCQ ON Electrical Machines

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