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Electrical Machines

Electrical Machines
Eddy current loss will depends on

 Flux density
All of these
 Thickness
 Frequency

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Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

  35 ppm.
 45 ppm.
 20 ppm.
 25 ppm.

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Electrical Machines
Compensating winding are used to rectify the flux density waveform at

None of these
 interpole region.
  region under main pole.
 throughout the air gap.

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Electrical Machines
What is the full form of MNP?

  Magnetic field neutral plane.
  Magnetic neutral plane.
  Magnetic neutral pole.
  Magnetic field neutral pole.

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Electrical Machines
Conservator tank is used

None of these
 to act as an oil storage.
 to take up the expansion of oil due to temperature rise.
 for better cooling of transformer.

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

 474 V
 6 V
 240 V
 234 V

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