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Electrical Machines

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

  35 ppm.
 20 ppm.
 25 ppm.
 45 ppm.

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Electrical Machines
Consider the following statements : 1. interpole windings are connected in series with armature windings 2. polarity of interpoles must be the same as that of the main poles in advance 3. distortion of the main field under the pole shoes is not affected by the use of interpoles From above, the correct answer is

 1 alone
 1 and 3
 2 and 3
 1 and 2

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Electrical Machines
Which of the following is the largest conversion device?

 Synchronous machine
 Induction machine
All of these
 DC machine

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Electrical Machines
Inter pole winding is connected in-------------------------- ?

 series with armature
 series with main poles
 parallel with armature
 parallel with main poles

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Electrical Machines
In DC machines shape of net flux density is?

 peaky in nature
 sine wave
 saddle shape
 flat tapped or trapezoidal

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Electrical Machines
Slip exists in

  in both machines.
  induction motor.
  synchronous motor.
  none of above.

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