Power Plant Engineering
Enriched uranium is required as a fuel in a nuclear reactor, if light water is used as moderator and coolant, because light water has

Low neutron absorption cross-section
High neutron absorption cross-section
Low moderating efficiency
High neutron scatter cross-section

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Power Plant Engineering
Enriched uranium is one in which

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

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Power Plant Engineering
Natural uranium is made up of

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

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