The number of neutrons accompanying the formation of 54Xe139 and 38Sr94 from the absorption of a slow neutron by 92U235, followed by nuclear fission is __________________?

An ideal coolant for a nuclear reactor should ________________?

A. Be a good absorber of neutrons

B. Be capable of attaining high temperature, only when it is pressurised

C. Have high density, but low heat transfer co-efficient

D. Be free from radiation damage and non-corrosive

Heavy water is preferred over ordinary water as a coolant, because it?

A. Acts both as an efficient coolant as well as a moderator

B. Can be heated to a higher temperature without pressurizing

C. Is less prone to radiation damage

D. All A., B. and C.

Primary purpose of a ____________ nuclear reactor is to supply a high neutron flux of the order of 1013 to 1014neutrons/cm2 second?

A. Research

B. Power

C. Breeder

D. Homogeneous

Fast breeder nuclear reactors using enriched uranium as fuel may contain upto a maximum of ____________ percent of U-235 (i.e. fissile material)?

A. 15

B. 45

C. 65

D. 85

Water is a better coolant than a gas (like CO2, He, N2 etc.), because it_________________?

A. Is a better neutron moderator as well

B. Require comparatively smaller pumps and heat exchanger for a given heat transfer rate

C. Has a better heat transfer characteristics, and it can be pressurised to attain a high temperature

D. All A., B. and C.