Nuclear Power Engineering
The specific heats of three gaseous coolants namely H₂, He and CO₂ in the increasing order are

H₂, He, CO₂
H₂, CO₂, He
CO₂, He, H₂
CO₂, H₂, He

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

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

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