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Power Systems

Power Systems
A 4 bus power system consists of 4 transmission lines, then find the sparsity of Y bus matrix?

 0.5
 0.75
 0.25
 0.4

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Power Systems
Percentage of carbon is highest in

  anthracite coal.
  coal gas.
  lignite coal.
  bituminous coal.

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Power Systems
By using guard ring in a transmission line, its string efficiency

None of these
 increase
 decrease
 remains unaffected

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Power Systems
In load flow studies PV bus is treated as PQ bus when

 phase angle become high
 reactive power goes beyond limit
 voltage at the bus become high
 any of the above

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Power Systems
The steam power plant efficiency can be improved by

 using large quantity of water.
  using high temperature and high pressure steam.
 decreasing the load on the plant.
 burning large amount of coal.

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Power Systems
In a short circuit test circuit breaker, time to reach the peak re-striking voltage 60 microsecond & the peak re-striking voltage 120 kV. Determine average RRRV (Rate of rise re-striking voltage)?

 1 × 106 kV / sec.
 3.5 × 106 kV / sec.
  2 × 106 kV / sec.
  3 × 106 kV / sec.

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