A. Calcium
B. Sodium
C. Mercury
D. Zinc
Related Mcqs:
- Gas cooling as compared to water cooling of nuclear reactors___________________?
A. Cannot attain a high temperature
B. Is more efficient as gas has a higher specific heat
C. Can produce only saturated steam for feeding to power turbine
D. None of these - Liquid metal (e.g., molten sodium) is preferred as a coolant in case of a/an ______________ reactor?
A. Homogeneous
B. Graphite moderated
C. Fast breeder
D. Enriched uranium (3% U-235) fuelled - Use of molten metal as a coolant in fast breeder reactor helps in_________________?
A. Rapid heat transfer from the core
B. Accelerating the reaction rate in the core
C. Breeding neutrons
D. Accelerating the neutrons - 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 - Safety rods provided in nuclear reactors to guard against accidents, in case of earthquake are made of___________________?
A. High carbon steel
B. Molybdenum
C. Zircaloy
D. Boron or cadmium - Which of the following nuclear reactors is the most efficient thermodynamically while operating between the same temperature and pressure limits of the reactor ?
A. Molten sodium cooled
B. CO2 gas cooled
C. Pressurised water
D. Boiling water - Heavy water used in the nuclear reactors to slow down the speed of neutrons is __________________?
A. Highly purified water
B. A compound of oxygen and deuterium
C. Water having dissolved salts of heavy metals
D. None of these - Which of the following types of nuclear reactors is most prone to radioactive hazards ?
A. Pressurised water reactor
B. Gas cooled reactor
C. Molten sodium cooled reactor
D. Boiling water reactor - Nuclear reactors are provided with shield to guard against the emission of mainly _____________ rays?
A. X
B. α and β
C. Neutrons & gamma
D. Infrared - Thermal shield is used in high powered nuclear reactors to__________________?
A. Protect the walls of the reactor from radiation damage
B. Absorb the fast neutrons
C. Slow down the secondary neutrons
D. Protect the fuel element from coming in contact with the coolant
