Nuclear Power Engineering
Thermal shield is used in high powered nuclear reactors to

Protect the walls of the reactor from radiation damage
Absorb the fast neutrons
Slow down the secondary neutrons
Protect the fuel element from coming in contact with the coolant

ANSWER DOWNLOAD EXAMIANS APP

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

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

ANSWER DOWNLOAD EXAMIANS APP