Power Plant Engineering
A nuclear unit becoming critical means

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

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Power Plant Engineering
Isotopes of same elements have

Different masses and different atomic numbers
Different chemical properties and same atomic numbers
Same atomic number and different masses
Same chemical properties but different atomic numbers

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

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