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

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

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Power Systems
Gas coolled reactor

  both B and C.
 use heavy water as coolant as well as moderator.
 use CO2. or helium as coolant and graphite the moderator.
 use coolant at pressure of 14-28 Kg/cm2 and at temperature of 700°-800° c.

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