Power Systems
The surge impedance of a 400 km long overhead transmission line is 420 Ω. For a 200 km length of the same line, the surge impedance will be

 400 Ω
 210 Ω
 420 Ω
 840 Ω

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Power Systems
The factor affecting run off are

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

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