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

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

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Power Plant Engineering
Ferrite material is

The material which absorbs neutrons and undergoes spontaneous changes leading to the formation of fissionable material
The most fissionable material
Basic raw material for nuclear plants
The basic fuel for nuclear paints

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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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