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Electrical Machines

Electrical Machines
Flux density under leading pole tips in case of generator will

 increase
 either increase or decrease
None of these
 decrease

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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

 4.
  8.
 1.
 2.

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Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

 BRY
All of these
 BYR
 RBY

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Electrical Machines
In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses?

 1.5KW
 3KW
 0.5Kw
 2KW

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Electrical Machines
Crawling in an induction motor is due to

  time harmonics in supply.
  space harmonics produced by winding currents.
  slip ring rotor.
  insufficient starting torque.

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Electrical Machines
In alternator, the rotary part is

 armature.
 none of these.
 core.
  magnetic field poles.

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MORE MCQ ON Electrical Machines

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