Nuclear Power Engineering
A homogeneous reactor is the one, in which the

Same substance (e.g. heavy water) is used as moderator & coolant
All of these
Fissile atoms are evenly distributed throughout the mass of nuclear reactor
The fuel and the moderator is mixed to form a homogeneous material

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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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