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Electrical Machines

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

  230.2 V.
 399 V.
 100 V.
 50 V.

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Electrical Machines
A 500 V, 120 KW, 50 Hz, star connected synchronous motor operating at 0.8 power factor leading has full load efficiency of 91%. The armature resistance is equal to 0.08Ω. The magnitude of armature current is nearly equal to

 240 A.
  190 A.
 173 A.
 127 A.

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Electrical Machines
The main disadvantage(s) of the ward-Leonard system is/are

 poor overall efficiency.
 high initial cost.
 high maintenance cost.
 all of above.

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Electrical Machines
Series field consists of--------number of turns and ---------- conductors respectively

 large and thin
 large and thick
 less and thin
 less and thick

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Electrical Machines
In a Dc generator the magnetic neutral axis coincide with geometrical neutral axis, when

  there is no load on the generator.
  the generator runs on full load.
  the generator runs on overload.
  the generator runs on designed speed.

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Electrical Machines
The sparking at the the brushes, in a DC machines is due to

  reactance voltage.
 armature reaction.
 presence of commutator.
 high resistance of carbon brushes.

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