Power Systems
Direct conversion of heat energy into electrical energy is possible through

 Both A and C.
 Thermal converters.
 MHD generator.
 Fuel or solar cell.

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Power Systems
The factor affecting run off are

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

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