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Electrical Machines

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

 S.Ns
 Zero
 Ns
 Nr

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Electrical Machines
In a three phase star - delta transformer, what is the angle difference between primary and secondary phase voltages?

 Star side lags by -30°.
 Delta side leads by 30°.
 Star side leads by 30°.
  Delta side lags by -30°.

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Electrical Machines
The current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is

 60
 600
 660
 40

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Electrical Machines
At stand still condition the value of slip is

 0
 infinite value
 finite value
 1

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Electrical Machines
In induction motor when the length of the air gap is increased, the magnetizing current of the motor increases while the short circuit current __________________.

 kept constant to certain value.
  remains unchanged.
 decreased.
 increased.

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

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MORE MCQ ON Electrical Machines

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