Power Systems
Transmission lines are transposed to reduce

 proximity effect
 interference with neighbouring communication lines
 skin effect
 ferranti effect

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

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