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Power Systems

Power Systems
For symmetrical network, the neutral current is

 maximum
 zero
 infinity
 any of the above

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Power Systems
Two insulator discs of identical capacitance value C make up a string for a 22 kV, 50 Hz, single phase overhead line insulation system. If pin to earth capacitance is also C, then find the string efficiency?

 86%%
 75%
 50%
 90%

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Power Systems
Four identical alternators each are rated for 20 MVA, 11 KV having a subtransient reactance of 16% are working in parallel. The short circuit level at the busbar is

 500 MVA
 125 MVA
 400 MVA
 100 MVA

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Power Systems
What will be the thermal efficiency of a 240 V, 1000 W electric kettle if it brings 2 liters of water at 15° C to boiling point 15 Minutes

 78.96 %.
  74.56 %.
 80.25 %.
  79.33 %.

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Power Systems
The Y bus matrix of a 100 bus interconnected system is 90% sparse. Then find the number of non zero elements in the Y bus matrix?

 90
 1000
 9000
 10

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Power Systems
Which of following are the fertile materials

 U238 and Pu239.
 U238 and Th239.
  U238 and Th232.
 U233 and Pu239.

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