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Electrical Machines

Electrical Machines
A 4-pole DC generator runs at 1500 rpm. The frequency of current in the armature winding is:

 25 Hz.
 Zero Hz.
 100 Hz.
 50 Hz.

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Electrical Machines
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

 leading.
  lagging.
 unity.
 zero.

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Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  Ia2.
  Ia.
  √Ia.
  1/Ia.

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Electrical Machines
Maximum allowable tan - delta (tanδ) of dielectric dispassion factor of power transformer insulating oil is generally taken as

  1 at 90°C.
 2 at 90°C.
 3 at 90°C.
 0.5 at 90°C.

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Electrical Machines
The condition for maximum running torque is

 0.5 lagging
 unity
 zero
 0.707 lagging
 R = S.X

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Electrical Machines
What is/are the advantages of parallel operation of alternators?

 Increase efficiency under light load conditions
All of these
 Increase in reliability
 continuity supply is maintained

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MORE MCQ ON Electrical Machines

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