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

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

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Power Plant Engineering
A nuclear unit becoming critical means

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

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