A. Lower density
B. Higher specific heat
C. Non-reactivity to uranium
D. Lower neutron capture cross-section
Related Mcqs:
- 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. - Pressure of CO2 gas (which is a coolant) in the Calder-Hall nuclear reactor is ______________ kgf/cm2?
A. 0.2
B. 7
C. 35
D. 50 - Which is used as a coolant in nuclear reactor due to its high capture cross-section ?
A. H2
B. N2
C. He
D. CO2 - 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. - 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 - Molten sodium is used as a coolant in a fast breeder reactor, because of its_________________?
A. Excellent moderating properties
B. Neutron breeding capability
C. Faster heat removal capability from the core
D. Capability to increase the reaction rate in the core - Molten sodium (as a coolant in fast breeder reactor) ?
A. Can’t attain high temperature at normal pressure
B. Is not at all corrosive, even at a higher temperature
C. Is highly radioactive at elevated temperatures and can cause explosion, when it comes in
contact with air or water
D. None of these - Coolant used in a boiling water reactor is________________?
A. Hydrogen gas
B. Water
C. Steam
D. A mixture of water & steam - ‘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
