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Electrical Machines

Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 36 W.
 25 W.
 28 W.
 30 W.

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Electrical Machines
If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary?

  It will becomes four times.
  It will be doubled.
 It will remain the same.
  It will be halved.

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Electrical Machines
Satisfactory commutation of DC machine requires

 smooth, concentric commutator properly undercut.
 brushes should smoothly run in the holders.
 brushes should be of proper grade and size.
All of these

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Electrical Machines
Scott connections are used for

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

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Electrical Machines
An auto transformer having a transformation ratio of 0.8 supplies a load pf 10 KW. The power transfered inductively from the primary to secondary is

  2 KW.
 10 KW.
 0.
 8 KW.

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Electrical Machines
An inverted V-curve of synchronous motor shows the variation of

All of these
 power factor and supply voltage during hunting
 power factor and dc excitation at constant load
 supply voltage and field current at constant excitation

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