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Electrical Machines

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

 1
 0
 0.5
 any of the above

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Electrical Machines
If the excitation is increased, the power factor is

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

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Electrical Machines
If a DC Series motor is connected across an AC supply it will

 not run.
 run at lower speed.
 burn.
 run at normal speed.

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Electrical Machines
Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

 1 and 2
 2 alone
 1, 2 and 3
 1 and 3

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Electrical Machines
Secondary winding of an auto transformer is also called

 tertiary winding.
 damping winding.
  common winding.
 compensating winding.

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Electrical Machines
Hunting in a synchronous motor takes place

  when power factor is unity.
  when load varies.
  when supply voltage fluctuates.
  motor is under loaded.

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