Power Systems
Aluminium is now most commonly employed conductor material in transmission lines than copper because

 it is more conductive
 its tensile strength is more
 it is cheaper and lighter
 costlier

ANSWER DOWNLOAD EXAMIANS APP

Power Systems
In hydroelectric power plants

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

ANSWER DOWNLOAD EXAMIANS APP