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Electrical Machines

Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 f
 f²
 V
 V²

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Electrical Machines
Scott connections are used for

 three phase to single phase transformation.
 any of the above.
 single phase to three phase transformation.
 three phase to two phase transformation.

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Electrical Machines
Commutators in DC machines have a role of which converts

 AC to DC.
 Both AC to DC and DC to AC.
 high voltage DC to low voltage DC.
 none of these.

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Electrical Machines
If the mechanical angle α between the stator and rotor poles increases, then the stator current

  Increases.
 Remains unchanged.
 Decreases.
 None of above.

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Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 dependent upon the load.
 0o.
 90o.
 180o.

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Electrical Machines
Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of

 2 / 3.
  4 / 5.
 5 / 6.
 6 / 7.

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MORE MCQ ON Electrical Machines

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