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Electrical Machines

Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

 0.9103 KW.
 1.644 KW.
 5.46 KW.
  2.73 KW.

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Electrical Machines
What type of dielectric material is used in capacitors used for fans and for power factor correction?

  Mica.
  Glass.
  Vacuum.
  Oil impregnated paper.

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Electrical Machines
When an electric train is moving down a hill, the DC motor will operate as

  DC series motor.
 DC shunt motor.
 DC shunt generator.
  DC series generator.

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Electrical Machines
The counter (or back) emf in a dc machine is 1. the same as generated emf in a dc motor 2. proportional to field flux and armature speed 3. not the same as generated emf in a dc motor 4.inversely proportional to field flux 5. proportional to number of armature conductors 6. constant from no load to full load From these, the correct answer is

 1, 2, 5
 2, 4, 5, 6
 2, 3, 6
 3, 4, 5

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Electrical Machines
The heat transfer by convection in a transformer least depends on

 surface area.
 air velocity.
  color of the paint.
 temperature difference.

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

 90°.
 60°.
 30°.
 120°.

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