Power Plant Engineering
When a reactor becomes critical, then the production of neutrons is

Zero
Exactly balanced by the loss of neutrons through leakage
Initiated
Infinite

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Power Plant Engineering
Enriched uranium is one in which

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

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