Power Systems
The essential requirement(s) for power plants to be operated as peak load plants are

 Quick response to load variation.
All of these
 Low capital cost.
 Capability of quick starts.

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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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