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

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

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Power Plant Engineering
In natural uranium, the constituents of three naturally occurring isotopes are

U₂₃₄ = 0.006%, U₂₃₅ = 99.282% and U₂₃₈ = 0.712%
U₂₃₄ = 99.282%, U₂₃₅ = 0.006% and U₂₃₈ = 0.712%
U₂₃₄ = 0.006%, U₂₃₅ = 0.712% and U₂₃₈ = 99.282%
U₂₃₄ = 0.712%, U₂₃₅ = 0.006% and U₂₃₈ = 99.282%

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Power Plant Engineering
A nuclear unit becoming critical means

There is danger of nuclear spread
Chain reaction that causes automatic splitting of the fuel nuclei has been established
It is capable of generating much more than rated capacity
It is generating power to rated capacity

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