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Electrical Machines

Electrical Machines
The induction motor shaft is made of

  mild steel.
  aluminium.
  stainless steel.
  cast iron.

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Electrical Machines
When excitation is increased (over excitation), the synchronous generator operates at

 any of the above.
 lagging power factor.
 unity power factor.
 leading power factor.

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Electrical Machines
Reactive power generated or delivered significantly depends on

 excitation.
 both 1 and 2.
 frequency.
 load angle.

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Electrical Machines
In a dc machine 6 pole wave winding is used. The number of parallel paths are?

 1
 2
 4
 6

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Electrical Machines
The efficiency of a transformer is mainly dependent on

 core losses.
 stray losses.
 copper losses.
 dielectric losses.

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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?

 50 Hz
 48.5 Hz
 48 Hz
 45 HZ

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