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Electrical Machines

Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 3 or 4
 2
 1
 0

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Electrical Machines
In a Dc generator the magnetic neutral axis coincide with geometrical neutral axis, when

  the generator runs on overload.
  the generator runs on designed speed.
  there is no load on the generator.
  the generator runs on full load.

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Electrical Machines
If the air gap of IM is increased, ____________ will increase.

  magnetizing current.
  speed.
  power factor.
  air gap flux.

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Electrical Machines
In above question, the output power delivered by generator G1 and G2 will be

 9.3 kW, 9.3 kW.
 5.7 kW, 8.7 kW.
  6.3 kW, 9.3 kW.
 9.6 kW, 12 kW.

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Electrical Machines
Rotating magnetic field is produced in an induction motor because of

  either stator winding or rotor winding.
  stator winding.
  rotor winding.
None of these

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Electrical Machines
Lamination of transformer core is made of

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

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