Power Systems
For some given transmission line the expression for voltage regulation is given by (Vs - Vr)/Vr *100%. Hence,

 this must be a short line
 this may either be a medium line or short line
None of these
 this expression is true for any line

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

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