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Electrical Machines

Electrical Machines
Field weakening control method is used for the _________ ?

 below rated speed
 above rated speed
 both A and B
None of these

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

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

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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

 to avoid locking of the armature.
All of these
 to achieve a stronger magnetic field.
 to avoid over heating.

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Electrical Machines
The wattage rating of a ceiling fan motor will be

 200 - 250 W.
  50 - 150 W.
 250 - 500 W.
 10 - 20 W.

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Electrical Machines
The speed of a 3-phase induction motor operating in its stable region

 decreases with decrease in the load torque.
 increases with increase in the load torque.
 decreases with increase in the load torque.
 remains constant.

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Electrical Machines
What is the function of inter pole in DC generator?

  Both option B and C.
 To serve the economical aspects.
 To neutralize the distortion of main field flux due to armature reaction.
 To get a superior commutation.

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