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Electrical Machines

Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 90°.
 120°.
 60°.
 30°.

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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

 10 KW.
 0.
 8 KW.
  2 KW.

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Electrical Machines
The armature core of a DC machine is laminated to minimise

 hysteresis loss
 mechanical loss
 eddy-current loss
 temperature rise

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Electrical Machines
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

 unity.
 leading.
 zero.
  lagging.

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Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  25 Hz.
  60 Hz.
  16.67 Hz.
  50 Hz.

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Electrical Machines
Open circuit in a transformer is prefered with

 direct current
 rated transformer voltage
 high frequency supply
 rated transformer current

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