Power Plant Engineering
Amongst the following, the fissionable materials are

U₂₃₅ and Pu₂₃₅
U₂₃₈ and Pu₂₃₉
U₂₃₁ and Pu₂₃₃
U₂₃₃ and Pu₂₂₉

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Power Plant Engineering
Pick up the wrong statement

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

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