Power Plant Engineering
Moderator in nuclear plants is used to

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

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Power Plant Engineering
Isotopes of same elements have

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

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Power Plant Engineering
Natural uranium is made up of

99.282% U₂₃₅, 0.712% U₂₃₄, 0.006% U₂₃₈
99.282% U₂₃₄, 0.712% U₂₃₈, 0.006% U₂₃₅
99.282% U₂₃₅, 0.712% U₂₃₈, 0.06%' U₂₃₄
99.282% U₂₃₈, 0.712% U₂₃₅, 0.006% U₂₃₄

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