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Power Systems

Power Systems
In which of the following given faults, all the sequence currents are equal?

 LLL
 LG
 LLG
 LL

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Power Systems
Steady state stability of a power system is improved by

 using double circuit line instead of single circuit line
All of these
 single pole switching
 decreasing generator inertia

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Power Systems
Three generators rated 100 MVA, 11 kV have an impedance of 0.15 pu each. If in the same plant, these generators are being replaced by a single equivalent generator, the effective impedance of equivalent generator will be

 0.15 pu
 0.45 pu
 0.25 pu
 0.05 pu

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Power Systems
Reflection coefficient of voltage is Rv

 (Zs - Zl)/(Zs + Zl)
 (Zl - Zs)/(Zs + Zl)
 2Zl/(Zs + Zl)
 2Zs/(Zs + Zl)

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Power Systems
For 800 MJ stored energy in the rotor at synchronous speed, what is the inertia constant H for a 50 Hz, four pole turbo generator rated 100 MVA, 11 kV?

 2 MJ/MVA
 6 MJ/MVA
 4 MJ/MVA
 8 MJ/MVA

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

  16 - 24.
 12 - 14.
 3 - 6.
 6 - 8.

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