Power Systems
Which of the following contributes to the Rankine cycle efficiency improvement in a thermal power plant

 Use of high pressure.
 Reheat of steam an intermediate stages.
 Use of steam for heating of boiler feed water.
All of these

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Power Systems
The value of off diagonal elements is

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

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