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Power Systems

Power Systems
A CT is connected in ___________________ with the line.

  across.
  series.
  both A and B.
  not connected.

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Power Systems
When is the ferranti effect on long overhead lines experienced?

 The line is heavily loaded
 The line is fully loaded
 The power factor is unity
 The line is lightly loaded

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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

 135.3 MWhr
 140 MWhr
 120 MWhr
 130.2 MWhr

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Power Systems
Reflection coefficient of voltage is Rv

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

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Power Systems
Which of the following is used in thermal plants

 Joule cycle
 Rankine cycle
 Otto cycle
All of these

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Power Systems
A transmission line has self and mutual impedances of 0.8 pu and 0.2 pu. Find the positive, negative and zero sequence impedances respectively?

 0.6, 0.8 and 1.2 pu
 0.6, 0.6 and 1.2 pu
 0.8, 0.6 and 1.2 pu
 0.8, 0.8 and 1.2 pu

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