Power Systems
Efficiency of thermal power plant can be taken as

  generator efficiency.
  product of efficiencies of all stages.
  efficiency of thermal cycle.
  turbine efficiency.

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Power Systems
Per unit of any quantity is defined as

 base value of quantity /actual value of quantity in same units
 base value of quantity /actual value of quantity in different units
 actual value of quantity /base value of quantity in same units
 actual value of quantity /base value of quantity in different units

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