Power Systems
In hydro power stations what is an enlarged body of water just above the intake and used as a regulating reservoir called

 Reservoir.
 Penstock.
  Fore bay.
 Spillways.

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Power Systems
Gas coolled reactor

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

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