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Power Systems

Power Systems
If the inertia constant H = 10 MJ/MVA for a 50 MVA generator, the stored energy is

 5 MJ
 10 MJ
 500 MJ
 50 MJ

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Power Systems
Buchholz relay is used for protection of

  transformer.
  bus bar.
  none of these.
  alternator.

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Power Systems
Condition for maximum voltage regulation

 tanφ = R/X
 cosφ = R/X
 tanφ = X/R
 cosφ = X/R

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Power Systems
Which of the following is not a secondary nuclear fuel

 Pu239.
 U233.
 None of above.
  U235.

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Power Systems
A transmission line has self and mutual impedances are 0.8 and 0 pu respectively. Find the positive, negative and zero sequence impedances respectively?

 0.6, 0.6 and 0.6 pu
 0.6, 0.6 and 1.2 pu
 0.8, 0.8 and 0.8 pu
 0.6, 0.8 and 1.2 pu

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Power Systems
The use of high speed circuit breakers

  improves system stability.
 decrease system stability.
 reduces the short circuit current.
 increased the short circuit current.

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