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Electrical Machines

Electrical Machines
The no load current in a transformer lags the applied voltage by

 90°.
 0°.
  about 75°.
 about 115°.

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Electrical Machines
The starting resistance of DC motor is generally

 1000 ohms.
 Infinitely large.
 around 500 ohms.
  Low.

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Electrical Machines
Which of the following motor has the highest power factor at full load?

 Resistance split phase
 Capacitor start
 Shaded pole
 Capacitor run

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Electrical Machines
A compound motor has

  only series field winding.
  tertiary winding.
  only shunt field winding.
  both shunt and series field winding.

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Electrical Machines
For power factor improvement the synchronous motor is to be

 lightly loaded and over excited
 lightly loaded and underecited
 heavily loaded and over excited
 heavily loaded and underexcited

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Electrical Machines
Which method is less recommendable for induction motor starting in the industries?

  Auto transformer starting.
  Direct online starting.
  Rotor resistance starting.
  Stator resistance starting.

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MORE MCQ ON Electrical Machines

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