Electrical Machines
A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be

None of these
 6% and -4%
 3.2% and -1.6%
 4.8% and -3.2%

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Electrical Machines
In a dc generator operating on load with its brushes on the geometrical neutral axis (GNA), the magnetic neutral axis (MNA) is shifted in the direction of rotation. Now, if the brushes are given a lead of 90° (electrical), then the MNA will

 shift forward by 90°
 shift forward by more than 90°
 coincide with the GNA
 shift forward by less than 90°

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Electrical Machines
In an alternator, voltage drops occurs in

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

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