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Electrical Machines

Electrical Machines
It is an advisable to use auto transformer if the transformation ratio is

 0.25.
 0.5.
 Greater than 1.
 near to 1.

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Electrical Machines
1 KVA, 230 V, 50 Hz, single phase transformer has an eddy current loss of 30 watts. The eddy current loss when the transformer is excited by a dc source of same voltage will be

 30 W
 less than 30 W
 zero watt
 more than 30 W

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Electrical Machines
In above question, the output power delivered by generator G1 and G2 will be

  6.3 kW, 9.3 kW.
 9.3 kW, 9.3 kW.
 5.7 kW, 8.7 kW.
 9.6 kW, 12 kW.

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Electrical Machines
In a DC generator in case the brushes are moved so as to bring them in magnetic neutral axis, then, there will be

 demagnetisation.
  none of above.
  cross-magnetization as well as demagnetization.
  cross-magnetisation.

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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

 700 W
 625 W
 650 W
 600 W

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Electrical Machines
The slot edges in a DC machine are made of

 Mild steel.
  Fibre.
 Cast iron.
 Silicon steel.

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