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Electrical Machines

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

 120°.
 90°.
 30°.
 60°.

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Electrical Machines
In alternator, the rotary part is

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

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Electrical Machines
In DC generator, full form of MNA is what?

 Magnetic neutral armature co-ordinate.
  Magnetic neutral axis.
 Magnetically no-load armature co-ordinate.
 Magnetic no-load axis.

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Electrical Machines
Which of the following motors has negative speed regulation?

 Series motors.
 Both B and C.
 Shunt motors.
 Differential compound motors.

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Electrical Machines
Commutator in DC generator is used for

 reduce losses
 increase efficiency
 convert AC armature current in to DC
 collecting of current

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Electrical Machines
Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are identical as 4% from no load to full load. Consider the governors operating at 50Hz on no load. What is the operating frequency, if the load is 600 MW?

 48.5 Hz
 50 Hz
 48 Hz
 45 HZ

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