Nuclear Power Engineering
Heavy water used in the nuclear reactors to slow down the speed of neutrons is

A compound of oxygen and deuterium
Highly purified water
Water having dissolved salts of heavy metals
None of these

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Nuclear Power Engineering
An ideal coolant for a nuclear reactor should

Be free from radiation damage and non-corrosive
Be a good absorber of neutrons
Have high density, but low heat transfer co-efficient
Be capable of attaining high temperature, only when it is pressurised

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