Power Systems
Which of following generating plants has the minimum operating cost

 Hydroelectric plant.
 Diesel plant.
 Nuclear plant.
 Steam plant.

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Power Systems
A sodium graphite reactors use

 a mixture of sodium and graphite as coolant.
  sodium as coolant and graphite as moderator.
 a mixture of sodium and graphite as moderator.
 sodium as moderator and graphite as coolant.

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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.
 amount of vegetation and weather condition in the catchment area.
 rain fall pattern, shape and size of catchment area.

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