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

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

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Nuclear Power Engineering
An ideal coolant for a nuclear reactor should

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

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