Power Systems
Peterson coil is used in case of transmission line for

 increase the voltage level
 compensation of arcing grounds
 reduce ferranti effect
 improve power factor

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Power Systems
The factor affecting run off are

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

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