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

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

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Power Systems
Gross head of an hydroelectric power station is

 the height of water level in the river where the tail race is provided.
  the difference of water level between the level in storage and tail race.
 the height of water level in the river where the storage is provided.
 all of above.

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