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

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

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Power Systems
The factor affecting run off are

  all of above.
 the topography and nature of soil in the catchment area.
 rain fall pattern, shape and size of catchment area.
 amount of vegetation and weather condition in the catchment area.

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