Nuclear Power Engineering
A heterogeneous reactor is the one, in which the moderator and the

Coolant are different materials
None of these
Fuel are present in different phases (e.g. uranium and heavy water)
Coolant are present in different phases (e.g., heavy water and graphite)

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Nuclear Power Engineering
An ideal coolant for a nuclear reactor should

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

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