Power Systems
Which of the following statements is/are true regarding HVDC?

 HVDC can utilize earth for its return path
 There is no skin effect in dc line
All of these
 Corona loss is very much reduced in the dc line

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

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