Enriched uranium is required as a fuel in a nuclear reactor, if light water is used as moderator and coolant, because light water has

A High neutron absorption cross-section
B Low moderating efficiency
C High neutron scatter cross-section
D Low neutron absorption cross-section

Correct Answer: Low moderating efficiency

Enriched uranium is required as a fuel in a nuclear reactor, if light water is used as moderator and coolant, because light water has Low moderating efficiency
Bissoy MCQ
#Mechanical Engineering #Power Plant Engineering

Related Questions

CANDU type nuclear reactor using natural uranium as fuel is the extensively used nuclear reactor because of the fact that the
A Specific fuel consumption is very low due to the use of heavy water
B Fuel cost is much lower than that used in pressurised water or boiling water reactor
C Heavy water is used both as coolant as well as moderator
D Both B and C
Heavy water is used as a moderator in a nuclear reactor. The function of the moderator is
A to control the energy released in the reactor
B to absorb neutrons and stop the chain reaction
C to cool the reactor
D to slow down the neutrons to thermal energy
Where reactor operation is designed with fast neutrons such as in reactors using highly enriched fuel, the moderator used is
A Heavy water
B Graphite
C Carbon dioxide
D No moderator is needed
Nuclear fuel generally used in reactors is uranium oxide instead of uranium, because the former has higher
A Melting point, hence can be subjected to higher temperature
B Density ; hence core volume for a given power output would be smaller
C Resistance to effects of irradiation
D All of the above
Boiling water reactor uses the following as moderator, coolant and working fluid
A Ordinary fluid
B Heavy water
C Molten lead
D Hydrogen gas
If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a __________ reactor.
A Critical
B Breeder
C Fertile
D Heterogenous
'Light water' used as a coolant in nuclear reactor is nothing but
A Ordinary water
B Mildly acidic (pH = 6) water
C Mildly alkaline (pH = 8) water
D None of these
__________ gas is normally not used as a coolant in a nuclear reactor, because of its high neutron capture cross-section.
A Nitrogen
B Hydrogen
C Helium
D Carbon dioxide
Which of the following is used as a moderator in nuclear reactor?
A Thorium
B Graphite
C Radium
D Ordinary water
Which set of materials is used as a moderator in nuclear reactor?
A Zircalloy & berrylium
B Zircalloy & heavy water
C Zirconium & berrylium
D Heavy water & berrylium

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