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

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

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Power Systems
In hydroelectric power plants

 both operating and initial cost are low.
  operating cost is low and initial cost is high.
 operating cost is high and initial cost is low.
 both operating and initial cost are high.

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

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