Power Systems
Aluminium is now most commonly employed conductor material in transmission lines than copper because

 costlier
 it is cheaper and lighter
 its tensile strength is more
 it is more conductive

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Power Systems
Advantages of shunt compensation is/are

All of these
 single unit can be used as both capacitance and inductor by adjusting the excitation
 It requires less maintanance
 smooth voltage regulation is possible by controlling excitation

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