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
Emission of hazardous radiation
Velocity of the secondary neutrons
Conversion of fissile material into fertile material

ANSWER DOWNLOAD EXAMIANS APP

Nuclear Power Engineering
Water is a better coolant than a gas (like CO₂, He, N₂ etc.), because it

Has a better heat transfer characteristics, and it can be pressurised to attain a high temperature
All of these
Requires comparatively smaller pumps and heat exchanger for a given heat transfer rate
Is a better neutron moderator as well

ANSWER DOWNLOAD EXAMIANS APP