Power Plant Engineering
The mass number of a substance represents the sum of total number of

Neutrons and electrons in an atom
Protons and neutrons in a nucleus
Protons and neutrons in an atom
Protons and electrons in an atom

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Power Plant Engineering
A nuclear unit becoming critical means

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

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Power Plant Engineering
Enriched uranium is one in which

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

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