Power Systems
For harnessing low variable water heads, the suitable hydraulic turbine with high percentage of reaction and runner adjust vanes is

  Francis.
  Impeller.
  Kaplan.
  Pelton.

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Power Systems
In hydroelectric power plants

 both operating and initial cost are high.
 operating cost is high and initial cost is low.
  operating cost is low and initial cost is high.
 both operating and initial cost are low.

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