Power Plant Engineering
Isotopes of same elements have

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

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Power Plant Engineering
Enriched uranium is one in which

Percentage of U₂₃₅ has been artificially increased
Percentage of U has been artificially increased
Percentage of U₂₃₄ has been artificially increased
Extra energy is pumped from outside

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

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