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

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

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Power Systems
The advantage of hydro electric power station over thermal power station is

 the initial cost of hydro electric power station is low
 hydro electric station can be constructed at the place where the energy is required
 hydro electric power station can supply the power throughout the year
 the operation cost of hydro electric power station is low

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