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Electrical Machines

Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

 1.644 KW.
 5.46 KW.
  2.73 KW.
 0.9103 KW.

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Electrical Machines
DC machine is a

 none of above are correct.
 both are correct.
 convection machine.
 conduction machine.

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Electrical Machines
In above question, find rms line voltage for delta connection?

 399 V.
 50 V.
  230.2 V.
 100 V.

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Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 625 W
 600 W
 650 W
 700 W

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Electrical Machines
Armature reaction in dc motor results

  short circuit.
  open circuit.
  decrease in speed.
  increase in speed.

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Electrical Machines
Fufuraldehyde analysis is done to determine the

 condition of oil in transformer.
 condition of lamination on CRGO steel sheet.
 condition of cork gaskets used in transformer.
  condition of paper insulation in transformer.

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