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Electrical Machines

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

 45 ppm.
 20 ppm.
 25 ppm.
  35 ppm.

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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

 133.22 N-m
 cant be determined.
 266.20 N-m.
 234.76 N-m.

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Electrical Machines
Equalizer rings are used in which of the followings?

 lap winding
 wave winding
None of these
 both 1 and 2

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Electrical Machines
Conservator tank is used

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

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Electrical Machines
Armature reaction effect is more in which of the following methods?

 same in both methods
 field weakening method
 armature resistance control
None of these

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

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

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