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Electrical Machines

Electrical Machines
Swinburne test is conducted under which of the following condition?

 any of the above
 no load
 full load
 half load

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Electrical Machines
In dc machines, the field-flux axis and armature-mmf axis are respectively along

 quadrature axis and interpolar axis
 direct axis and indirect axis
 quadrature axis and direct axis
 direct axis and interpolar axis

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Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 V²
 f
 V
 f²

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Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  about 2 V.
  zero.
  220 V.
  about 50 V.

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Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 230 V
 115 V
 460 V
 200 V

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Electrical Machines
Drop in speed from no load to full load is very high in

 Cummulative compound motor with interpoles.
  Series motor without interpoles.
 Series motor with interpoles.
 Shunt motor with interpoles.

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