Nuclear Power Engineering
A control rod

Should have large absorption cross-section
Both B and C
Is generally made of boron, hafnium or cadmium
Should have small absorption cross-section

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Nuclear Power Engineering
An ideal coolant for a nuclear reactor should

Be free from radiation damage and non-corrosive
Be a good absorber of neutrons
Have high density, but low heat transfer co-efficient
Be capable of attaining high temperature, only when it is pressurised

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

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

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