Power Systems
Direct conversion of heat energy into electrical energy is possible through

 Fuel or solar cell.
 MHD generator.
 Thermal converters.
 Both A and C.

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Power Systems
The value of off diagonal elements is

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

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