Power Plant Engineering
In order to have constant chain reaction to produce a constant rate of heat output, the value of ratio of the number of neutrons in one generation to the number of neutrons in the immediately preceding generation must be

Greater than 1.0
Equal to zero
Equal to 1.0
Less than 1.0

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Power Plant Engineering
Enriched uranium is one in which

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

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