Power Plant Engineering
Isotopes of same elements have

Different masses and different atomic numbers
Same chemical properties but different atomic numbers
Different chemical properties and same atomic numbers
Same atomic number and different masses

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Power Plant Engineering
Pick up the wrong statement

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