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Power Systems

Power Systems
The insulation of modern EHV is designed based on

 lightning voltage.
 RI.
  switching voltage.
 corona.

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Power Systems
String efficiency depends upon

 voltage rating of one SCR.
  all of these.
 no. of SCR in the string.
 voltage rating of whole string.

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Power Systems
Three generators rated 100 MVA, 11 kV have an impedance of 0.15 pu each. If in the same plant, these generators are being replaced by a single equivalent generator, the effective impedance of equivalent generator will be

 0.25 pu
 0.15 pu
 0.05 pu
 0.45 pu

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Power Systems
If sag in an overhead line increase, tension in the line

 remains same
None of these
 increase
 decrease

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Power Systems
The Gauss Seidel load flow method has following disadvantages. Which of the following statement is wrong?

 Choice of slack bus affects the convergence
 Slow convergence
 Unreliable convergence
 A good initial guess for voltages is essential for convergence

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Power Systems
Advantages of pumped storage plants is/are

 operating time is minimum
All of these
 used as load frequency control
 most economical as a peak load supply plant

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