Power Systems
Lightning arresters are used for

All of these
 protection of equipment from open circuits
 protection of equipment from external lightning
 protection of equipment from short circuits

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

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