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Electrical Machines

Electrical Machines
In alternator, the rotary part is

 armature.
  magnetic field poles.
 none of these.
 core.

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

 90°.
 120°.
 60°.
 30°.

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Electrical Machines
Unbalanced supply voltage given to a 3 - φ, delta connected induction motor will cause

  less heating of the rotor.
  all of these.
  negative sequence current.
  less heating of the rotor.

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Electrical Machines
Transformers operating in parallel will share the load depending upon their

 leakage reactance.
 efficiency.
 percentage impedance.
 rating.

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Electrical Machines
Fufuraldehyde analysis is done to determine the

  condition of paper insulation in transformer.
 condition of oil in transformer.
 condition of lamination on CRGO steel sheet.
 condition of cork gaskets used in transformer.

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Electrical Machines
What is the shunt resistance component equivalent circuit obtained by no load test of an induction motor representative of ?

 core loss only
 windage and friction loss
 both 1 and 2
 Copper loss

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