Nuclear Power Engineering
A fertile material is the one, which can be

Fissioned by slow (thermal) neutrons
Fissioned by either slow or fast neutrons
Converted into fissile material on absorption of neutron
Fissioned by fast neutrons

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

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

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