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

 Impeller.
  Kaplan.
 Francis.
 Pelton.

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Power Systems
In Rankine cycle, the work output from a turbine is given by

  change of entropy between inlet and outlet.
  change of enthalpy between inlet and outlet.
  change in temperature between inlet and outlet.
  change in internal energy between inlet and outlet.

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