Nuclear Power Engineering
Nuclear fuel generally used in reactors is uranium oxide instead of uranium, because the former has higher

Density ; hence core volume for a given power output would be smaller
Melting point, hence can be subjected to higher temperature
Resistance to effects of irradiation
All of these

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Nuclear Power Engineering
The main purpose of control rod in a nuclear reactor is to control the

Chain reaction and hence the power output by regulating the number of secondary neutrons causing fission
Conversion of fissile material into fertile material
Emission of hazardous radiation
Velocity of the secondary neutrons

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