Power Systems
A transmission line has a surge impedance of 400 Ω for a length of the line of 200 km. If the length of line is increased to 400 km, then its surge impedance is

 400 Ω
 0 Ω
 800 Ω
 200 Ω

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Power Systems
ACSR means

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

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