Nuclear Power Engineering
A heterogeneous reactor is the one, in which the moderator and the

Coolant are different materials
Coolant are present in different phases (e.g., heavy water and graphite)
None of these
Fuel are present in different phases (e.g. uranium and heavy water)

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Nuclear Power Engineering
Plutonium

Neither A nor B
Both A & B
Has much lower melting point (640°C ) compared to thorium (1690°C)
Is recovered from spent fuel from thermal nuclear reactor

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