Electrical Machines
Dissolve gas analysis of transformer oil is carried out to determine

 condition of bushings.
 condition of transformer oil.
  condition of transformer.
 condition of bushing stud.

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Electrical Machines
In a synchronous motor when the rotor speed exceeds the synchronous speed during hunting

  the damper bars develop induction generator torque.
  the damper bars develop induction motor torque.
  the damper bars develop synchronous motor torque.
  negative sequence currents are generated.

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Electrical Machines
In an alternator, voltage drops occurs in

  armature resistance, leakage reactance, armature reaction and earth connection.
  armature resistance only.
  armature resistance, leakage reactance and armature reaction.
  armature resistance and leakage reactance.

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