Power Systems
Advantages of pumped storage plants is/are

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

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Power Systems
Which of the following statements is/are true? The elements of each row of a Y bus matrix for load flow studies in power system add up to zero

 always
 if the shunt admittances at the buses are ignored
 if both 2 and 3 are satisfied
 if the mutual couplings between transmission lines are absent

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