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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

 250
 450
 500
 900

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Power Systems
The use of high speed circuit breakers

 decrease system stability.
  improves system stability.
 increased the short circuit current.
 reduces the short circuit current.

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Power Systems
The overall efficiency of a steam power plant equal to

  product of boiler efficiency, turbine efficiency and generator efficiency.
 the Rankine cycle.
 binary vapor cycle.
 regenerative cycle.

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Power Systems
A transmission line is compensated with shunt capacitance Csh. If the uncompensated transmission line surge impedance is Zs, then find the new surge impedance Zn after shunt compensation?

All of these
 √(1 + Kcsh)/Zs
 Zs*√(1 + Kcsh)
 Zs/√(1 + Kcsh)

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Power Systems
Power transmission lines are transposed to reduce

 skin effect
 ferranti effect
 radio interference
 proximity effect

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Power Systems
Rankine cycle efficiency of a steam power plant is of

  20 - 30 %.
  30 - 45 %.
  60 - 80 %.
  45 - 80 %.

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