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Electrical Machines

Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 60°.
 120°.
 30°.
 90°.

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Electrical Machines
On what factors the speed of dc motor depends?

 Field flux.
 All of these.
 Armature current Ia.
 Applied voltage.

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Electrical Machines
A 4 pole DC shunt generator having a wave winding supplies 50 lamps, each of 60 W at 120 V. The armature and field resistance are 0.2 Ω and 60 Ω respectively. The current in each armature conductor is

 23 A.
 27 A.
 11.5 A.
  13.5 A.

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Electrical Machines
Lamination of transformer core is made of

  silicon steel.
 cast steel.
 wrought iron.
  cast iron.

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Electrical Machines
Conservator tank is used

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

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

None of these
 lap winding
 both 1 and 2
 wave winding

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