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Electrical Machines

Electrical Machines
Compensating winding is placed in the

 main field
 pole shoe
 armature core
All of these

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Electrical Machines
A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor

 Remains unchanged.
 Oscillates around the rated speed.
  Decreases.
 Increases.

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

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

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Electrical Machines
Considering a galvanometer is connected to the rotor of a 3 - Φ, 4 pole, 50 Hz IM and is making 130 oscillations in a minute, then calculate the rotor speed?

 1500.
 1440.
 1450.
  1435.

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Electrical Machines
Which of the following motor is suitable for frequent starting and stoppings?

 Capacitor start motor
 Resistance split phase motor
All of these
 Capacitor start capacitor run motor

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Electrical Machines
stepped cores are used in transformers in order to reduce

 reluctance of core.
 volume of iron.
 volume of copper.
 iron loss.

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MORE MCQ ON Electrical Machines

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