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Electrical Machines

Electrical Machines
In DC generator on no-load, the air gap flux distribution in space is

  pulsating.
 triangular.
  sinusoidal.
  flat topped.

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Electrical Machines
Synchronous condensers are used to

 improve the power factor
 reduce hunting
All of these
 improve starting torque

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

 no load
 full load
 any of the above
 half load

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Electrical Machines
In dc machines, 1. reactance voltage is proportional to armature current 2.reactance voltage is proportional to core length 3.reactance voltage is due to self-flux of the coil undergoing commutation 4. armature-cross flux is neutralized by interpolar flux 5. interpolarmmf is more than armature mmf in the interpolar zone From these, the correct answer is

 1, 2, 3, 4
 1, 3, 5
 2, 3, 4
 1, 2, 5

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Electrical Machines
Two transformers with identical rating, are designed with flux densities of 1.2 and 1.4 Wb / m2 respectively. The weight of first transformer per kVA is

 none of these.
 less than that of second transformer.
 equal to that of second transformer.
  more than that of second transformer.

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Electrical Machines
Field winding of a DC series motor is usually provided with thick wire

 to reduce the insulation of materials.
 as it carries large load current.
 in order to reduce eddy current to provide large flux.
 to provide large flux.

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