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
None of these
 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

  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.
 both operating and initial cost are low.

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