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Power Systems

Power Systems
For complete protection of 3-phase system from the short circuit faults minimum number of relays required are

 three
 six
 two
 one

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Power Systems
Buchholz relay is used for protection of

  bus bar.
  transformer.
  none of these.
  alternator.

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Power Systems
A 10 MVA generator has reactance of 0.2 pu. Find the new reactance value for 50 MVA base?

 5 pu
 0.2 pu
 0.25 pu
 1 pu

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Power Systems
Operating time of pumped storage plant is

 very high
 high
 low
 can't say

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Power Systems
A penstock is used as a condition between

  the dam and the turbine in a hydro station.
 the turbine and discharge drain.
 none of above.
 the heat ex-changer and the turbine in nuclear power plant.

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Power Systems
Advantages of gauss siedel method is/are

All of these
 calculation time for each iteration is less
 number of iterations are less
 applicable for large power system network

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