Power Systems
Objectives of power system is/are

 Cost of electrical energy per KWh is to be minimum
 Rated voltage and frequency has to be supplied to the consumers
 both 1 and 2
 nether 1 nor 2

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Power Systems
Per unit of any quantity is defined as

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

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