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Power Systems

Power Systems
If skin depth is more, then skin effect is

 less
None of these
 more
 either 1 or 2

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Power Systems
A 25 MVA, 11 kV alternator is supplying full load at a point of 0.75 lagging. Determine the percentage increase in earning capacity when it is operated at improved power factor of 0.96 lagging.

  28 %.
  56 %.
  14 %.
  None of above

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Power Systems
High capacity generators and motors are of

 delta connected network
 star connected with grounding network
 star connected network
 any of the above

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Power Systems
In a long transmission line, if we increase the length of the line, the parameters A and B respectively

 increases and increases
 decreases and increases
 increases and decreases
 decreases and decreases

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Power Systems
In thermal power stations, economiser will

 reduce the heat
 both 2 and 3
 reduce the thermal efficiency
 increase the thermal efficiency

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Power Systems
Which of the following is/are the methods of improving transient stability?

 Dynamic breaking
All of these
 Fast acting excitation control
 Fast acting governing system

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