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Power Systems

Power Systems
The Y bus matrix of 100 bus interconnected system is 90% sparse. Hence the number of transmission lines in the system must be

 500
 900
 450
 250

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Power Systems
One Kg of natural uranium gives energy equivalent to about

 5000 Kg of coal.
 1000 Kg of coal.
  10500 Kg of coal.
 100 Kg of coal.

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Power Systems
What are the tests performed for oil-filled and gas-filled cables ?

  All of these.
 Thermal stability test.
 Impulse tests.
 Load cycle tests.

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Power Systems
In Francis turbine runner, the number blades is usually of the order of

  16 - 24.
 3 - 6.
 12 - 14.
 6 - 8.

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Power Systems
The line currents of 3-phase supply are: IR = 3 + j 5 A IY =2 + j 2 A IB = -2 - j 1 A The zero sequence current will be

 5 + j 7 A
 -2 - j 1 A
 1 + j 4 A
 1 + j 2 A

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Power Systems
The voltage regulation of a line at full load 0.8 power factor is 11. A long transmission line under no load conditions, for a good voltage profile needs

 shunt capacitor at receiving end
 shunt resistance at receiving end
All of these
 shunt reactor at receiving end

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