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

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

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Power Plant Engineering
Pick up the wrong statement

Fast reactor uses moderator
Slow or thermal neutrons have energy of the order or 0.025 eV
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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