Power Plant Engineering
Moderator in nuclear plants is used to

Cause collision with the fast moving neutrons to reduce their speed
Reduce temperature
Control the reaction
Extract heat from nuclear reaction

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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
In a heterogeneous or solid fuel reactor, the fuel is mixed in a regular pattern within moderator
Fast neutrons have energies above 1000 eV

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Power Plant Engineering
A nuclear unit becoming critical means

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

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