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Power Systems

Power Systems
In a 4 bus,4×4 Y bus matrix the number of non zero elements are 12. Find the number of transmission lines?

 4
 2
 8
 5

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Power Systems
A 3 - Φ, 33 kV oil circuit breaker is rated 1200 A, 2000 MVA, 3 s. The symmetrical breaking current is

 3600 A.
 104.8 kA.
 1200 A.
  35 kA.

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Power Systems
One million cubic meters of water is stored in a reservoir feeding a water turbine. The density of water is 993 kg/m³. If the centre of mass of water is 50 meters above the turbine and losses are negligible, the energy produced by that volume of water is

 140 MWhr
 130.2 MWhr
 120 MWhr
 135.3 MWhr

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Power Systems
Gas turbine power plants for maximum efficient may have

 Heat exchangers.
  All of above.
 Multistage compression.
 Reheating.

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Power Systems
An ACSR conductor has internal inductance 0.05 mH/Km for µr = 1. If this ACSR is replaced with another having µr = 2, then find the internal inductance?

 0.1 mH/Km
 0.025 mH/Km
 0.05 mH/Km
 0 mH/Km

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Power Systems
Isolator in sub station is open under ------------- condition?

 short circuit
 any of the above
 no load
 full load

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