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Electrical Machines

Electrical Machines
Swinburne test is conducted under which of the following condition?

 full load
 half load
 any of the above
 no load

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

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Electrical Machines
In a DC generator the emf generated by the armature is maximum when

 rate of change of flux is minimum.
 induced voltage is high.
  rate of change of flux is maximum.
 shaft rotation is high.

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Electrical Machines
Which of the following is minimized by laminating the core of a transformer?

 Stray loss.
 Eddy current loss.
 Copper loss.
 Hysteresis loss.

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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?

 BYR
All of these
 BRY
 RBY

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Electrical Machines
The demagnetising component of armature reaction in a DC generator

  reduces generator emf.
  results in sparking trouble.
  reduces inter poles flux density.
  increases armature speed.

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