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

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

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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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