Power Systems
The advantage of hydro electric power station over thermal power station is

 the operation cost of hydro electric power station is low
 the initial cost of hydro electric power station is low
 hydro electric power station can supply the power throughout the year
 hydro electric station can be constructed at the place where the energy is required

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Power Systems
ACSR means

 Aluminium copper steel reinforced
 Aluminium core steel reinforced
 all conductor steel reinforced
 Aluminium conductor steel reinforced

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