Power Systems
Reflection coefficient of voltage is Rv

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

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Power Systems
Consider a three phase, 50 Hz, 11 kV distribution system. Each of the conductors is suspended by an insulator string having two identical porcelain insulators. The self capacitance of the insulators is 5 times the shunt capacitance between the link and ground. Find the voltage across the two insulators V1 and V2? (V1 = Voltage of disc nearest to the conductor)

 V1 = 5 kV and V2 = 6 kV
 V1 = 3.46 kV and V2 = 2.89 kV
 V1 = 2.89 kV and V2 = 3.46 kV
 V1 = 6 kV and V2 = 5 kV

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Power Systems
A thermal power station needs space

 less than that required by atomic power station of the same output.
 less than that required by a gas turbine power plant of same output.
  less than that required by hydro-power station of same capacity.
 less than that required by the diesel power station of same output.

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