Power Plant Engineering
The size of the reactor is said to be critical when

Chain reaction can be initiated
It explodes
It becomes uncontrollable
It produces no power

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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
It is capable of generating much more than rated capacity
It is generating power to rated capacity
There is danger of nuclear spread

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Power Plant Engineering
Pick up the wrong statement

Slow or thermal neutrons have energy of the order or 0.025 eV
Fast reactor uses moderator
Fast neutrons have energies above 1000 eV
In a heterogeneous or solid fuel reactor, the fuel is mixed in a regular pattern within moderator

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