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

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Power Systems
Gross head of an hydroelectric power station is

  the difference of water level between the level in storage and tail race.
 the height of water level in the river where the storage is provided.
 all of above.
 the height of water level in the river where the tail race is provided.

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