Power Systems
For harnessing low variable water heads, the suitable hydraulic turbine with reaction and adjustable vanes runners is

 Francis
 Impeller
 Kaplan
 Pelton

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Power Systems
In hydroelectric power plants

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

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