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Electrical Machines

Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

 6.
 4.
  2.
  8.

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Electrical Machines
Rotating part of DC motor is known as

 Starter.
 Armature.
 Carbone brush.
 Pole.

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Electrical Machines
If the excitation is critical, the power factor of the alternator is

 leading power factor.
None of these
 unity power factor.
 lagging power factor.

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Electrical Machines
Eg (generated emf) and Eb (back emf) both are

 none of above.
 same.
 changes.
 different.

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Electrical Machines
A part an alternator winding consist of eight coils in series, each having an emf of 20 V rms induced in it. Coils are placed in successive slots and between each slot and the next, there is an electrical phase displacement of 30°. Find the emf of eight coils in series

 76.91 V.
  66.91 V.
 56.91 V.
 86.91 V.

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Electrical Machines
In an auto transformer, for what value of turn ratio, power transferred by inductively and conductively are same?

 0.5
 any of the above
 0
 1

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