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
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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Power Plant Engineering
Ferrite material is

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

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