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

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