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Power Systems

Power Systems
Find the surge impedance of a line when inductance is 160 mH and capacitance is 1µF?

 400 Ω
 800 Ω
 200 Ω
 160 Ω

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Power Systems
Buchholz relay is used for protection of

  transformer.
  bus bar.
  alternator.
  none of these.

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Power Systems
A power system consists of 300 buses out of which 20 buses are generator buses, 25 buses are the ones with reactive power support buses and 15 buses are ones with fixed shunt capacitors. All the other buses are load buses. It is proposed to perform a load flow analysis for the system using Newton-Raphson Jacobian matrix is

 555×555
 540×540
 554×554
 553×553

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Power Systems
The function of a surge tank is to

 none of above.
 supply water at constant pressure.
  relieve water hammer pressure in the penstock.
 produce surge in the pipeline.

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Power Systems
Reflection coefficient of voltage is Rv

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

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Power Systems
Location of a surge tank, in an hydro electric power station is near

  turbine.
 reservoir.
 tail race.
 dam.

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