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Electrical Machines

Electrical Machines
A DC generator without commutator is a

 DC generator
 induction motor
 AC generator
 DC motor

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Electrical Machines
What does the use the of height flux density value in transformer design lead to?

  Decrease in weight/KVA.
 Increase in weight/KVA.
 Reduced iron loss.
 Reduced copper loss.

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Electrical Machines
The dc motor which can provide zero speed regulation at full load without any controller, is

 cumulative compound.
 differential compound.
 shunt.
 series.

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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?

 45 HZ
 48.5 Hz
 48 Hz
 50 Hz

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Electrical Machines
No load saturation characteristics are plotted between

 no load voltage and armature current
 no load voltage and field current
 short circuit current and field current
 short circuit current and armature current

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Electrical Machines
At what power factor, the voltage regulation of a transformer can be zero ?

 Zero power factor.
  Leading power factor.
 Lagging power factor.
 Unity power factor.

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