Power Systems
Highest pressure generating pump inside the thermal plant is

All of these
 high pressure heater
 boiler feed pump
 low pressure heater

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Power Systems
The value of off diagonal elements is

 which is connected between bus i and bus j with positive sign
 sum of admittances connected at bus j
 sum of admittances connected at bus i
 which is connected between bus i and bus j with negative sign

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