Power Systems
Advantages of pumped storage plants is/are

All of these
 operating time is minimum
 most economical as a peak load supply plant
 used as load frequency control

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

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