Nuclear Power Engineering
Critical mass is the minimum mass of nuclear fissile material required for the

Power generation on commercial scale
Sustainment of chain reaction
None of these
Economic power generation

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Nuclear Power Engineering
Secondary cooling circuit is a must in molten sodium cooled fast breeder reactor for

Faster heat removal rate from the core
Lowering the coolant circulation pressure
Achieving high degree of superheat in the steam
Avoiding the mixing of water with radioactive sodium, as it may cause explosion

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