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

Heavy water
No moderator is needed
Graphite
Carbon dioxide

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Power Plant Engineering
Enriched uranium is one in which

Percentage of U₂₃₅ has been artificially increased
Extra energy is pumped from outside
Percentage of U has been artificially increased
Percentage of U₂₃₄ has been artificially increased

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