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Electrical Machines

Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 Ns
 Zero
 S.Ns
 Nr

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Electrical Machines
If dimension of all the parts of a synchorous generator and the number of field and armature turns are double, then generated voltage will change by a factor of

 1.
 4.
  8.
 2.

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Electrical Machines
Which of the following motor is not suitable for frequent starting and stopping?

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

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Electrical Machines
In dc machine armature windings are placed on rotor because of the necessity for

 development of torque.
 commutation.
 electromechanical energy conversion.
 generation of voltage.

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Electrical Machines
Which of these types of motor is self starting?

  Single phase induction motor.
  Poly-phase synchronous machine.
  Poly-phase induction motor.
  None of these.

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Electrical Machines
If the load current and flux of a DC motor are held constant and voltage applied across it armature is increased by 5%, the speed of the motor will

 Reduce by 5%.
  Increase by 5%.
 Depends on other factor.
 Remain unchanged.

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MORE MCQ ON Electrical Machines

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