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 station can be constructed at the place where the energy is required
 hydro electric power station can supply the power throughout the year

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Power Systems
An impulse turbine

 always operates submerged.
 makes use of a draft tube.
  operates by initial complete conversion to kinetic energy.
 is most suited for low head and high discharge power plants.

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