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Electrical Machines

Electrical Machines
Which single phase motor is used for a refrigerator?

  Universal.
  Capacitor run.
  Repulsion.
  Split phase.

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Electrical Machines
For power factor improvement the synchronous motor is to be

 lightly loaded and underecited
 lightly loaded and over excited
 heavily loaded and underexcited
 heavily loaded and over excited

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Electrical Machines
Armature reaction of an unsaturated DC machine is

  crossmagnetising.
 demagnetising.
  magnetising.
  none of above.

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Electrical Machines
A short-shunt cumulatively-compounded dc generator builds up a voltage of 220 V at no load at rated speed. If it is operated as a differentially compounded generator, other things remaining the same, it would build up

 6 V
 more than 220 V
 somewhat less than 220 V
 220 V

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Electrical Machines
A 2 KVA transformer has iron loss of 150 W and full load copper loss of 250 W. The maximum efficiency of the transformer would occur when the total loss is

 500 W
 400W
 300 W
 250 W

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Electrical Machines
Voltage across the open circuited field termninals of a synchorous machine under slip test is

 AC of supply frequency.
 A modulated supply frequency AC voltage with slip frequency envelop.
 DC.
  DC of slip frequency.

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