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Electrical Machines

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

 lap winding
 both 1 and 2
None of these
 wave winding

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Electrical Machines
In a 3 - Φ IM with line frequency f1 and winding factor kw1 and kw2 for stator and rotor respectively the ratio of per phase stator winding emf E1 to per phase rotor winding emf E2 at standstill is given by

  E1 / E2 = 1.
  E1 / E2 = N1kw1 / N2kw2.
  E1 / E2 = f1kw1 / f2kw2.
  E1 / E2 = N1 / N2.

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Electrical Machines
The flux involved in the emf equation of a transformer has

 rms value.
  maximum value.
 total value.
 average value.

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Electrical Machines
In DC generators brushes are used for

 collecting of voltage
 reduce eddy current loss
 convert ac armature current in to dc
 collecting of current without any sparkings

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

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

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Electrical Machines
The squirrel cage induction motors are provided with blades in order to

  balance the rotor dynamically.
  facilitate cooling of rotor.
  eliminate noise.
  none of these.

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