Power Plant Engineering
A nuclear reactor is said to be critical when the neutron population in the reactor core is

Reduced to zero
Rapidly increasing leading to the point of explosion
Constant
Decreasing from the specified value

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Power Plant Engineering
A nuclear unit becoming critical means

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

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