Power Systems
Which of following generating plants has the minimum operating cost

 Steam plant.
 Nuclear plant.
 Diesel plant.
 Hydroelectric plant.

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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
 hydro electric power station can supply the power throughout the year
 the operation cost of hydro electric power station is low
 the initial cost of hydro electric power station is low

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