Power Systems
The load current in short circuit calculations are neglected because

 short circuit currents are greatly out of phase with load currents
 nether 1 nor 2
 short circuit currents are much larger than load currents
 both 1 and 2

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

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

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