Power Plant Engineering
Where reactor operation is designed with fast neutrons such as in reactors using highly enriched fuel, the moderator used is

Graphite
No moderator is needed
Carbon dioxide
Heavy water

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Power Plant Engineering
Ferrite material is

The basic fuel for nuclear paints
Basic raw material for nuclear plants
The most fissionable material
The material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material

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