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Electrical Machines

Electrical Machines
Armature resistance control method is used for the _______ ?

 below rated speed
None of these
 both 1 and 2
 above rated speed

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

 100 V.
  230.2 V.
 50 V.
 399 V.

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Electrical Machines
Scott connections are used for

 single phase to three phase transformation.
 three phase to two phase transformation.
 any of the above.
 three phase to single phase transformation.

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Electrical Machines
Ward Leonard control provides speed control

 in one direction only.
 above rated speed.
 in both direction.
 below rated speed.

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Electrical Machines
In DC generator, full form of MNA is what?

  Magnetic neutral axis.
 Magnetic no-load axis.
 Magnetically no-load armature co-ordinate.
 Magnetic neutral armature co-ordinate.

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Electrical Machines
In a DC machine, which of these parameters remain the same whether it runs as a DC motor or a DC generator?

 Can not be determined.
 Armature current.
 Mechanical power.
 Induced emf.

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