Description : In nuclear reactor, heavy water is used as – (1) coolant (2) fuel (3) moderator (4) atomic smasher
Last Answer : (3) moderator Explanation: Heavy water is used in certain types of nuclear reactors where it acts as a neutron moderator to slow down neutrons so that they are more likely to react with ... do not require uranium enrichment, heavy water reactors are of concern in regards to nuclear proliferation.
Description : In nuclear reactor, heavy water is used as (1) coolant (2) fuel (3) moderator (4) atomic smasher
Last Answer : moderator
Description : The part of a nuclear power plant that prevents thermal pollution of lakes or rivers is the: w) reactor x) coolant/moderator y) cooling tower z) control rod
Last Answer : ANSWER: Y -- COOLING TOWER
Description : 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)
Last Answer : (D) All (A), (B) and (C)
Description : Which nuclear reactor uses water as a coolant, moderator and reflector ?
Last Answer : Pressurised water reactor.
Description : In which reactor the coolant and moderator are the same ? Pressurised water reactor.
Description : Heavy water (D2O) in a nuclear reactor serves as a (A) Coolant (B) Moderator (C) Both (A) & (B) (D) Neutron absorber
Last Answer : (C) Both (A) & (B)
Description : In a pressurised water reactor (PWR), the (A) Fuel is natural uranium and heavy water acts both as moderator & coolant (B) Coolant water boils in the core of the reactor (C) Coolant water is pressurised to prevent bulk boiling of water in the core (D) Use of moderator is not required
Last Answer : (C) Coolant water is pressurised to prevent bulk boiling of water in the core
Description : A homogeneous reactor is the one, in which the (A) Fissile atoms are evenly distributed throughout the mass of nuclear reactor (B) Same substance (e.g. heavy water) is used as moderator & coolant (C) The fuel and the moderator is mixed to form a homogeneous material (D) All (A), (B) and (C)
Last Answer : (C) The fuel and the moderator is mixed to form a homogeneous material
Description : A pressurised water reactor (PWR) uses pressurised water as a (A) Coolant (B) Working fluid in power turbine (C) Moderator (D) None of these
Last Answer : (A) Coolant
Description : A fast breeder reactor employs (A) Graphite as moderator (B) Water as coolant (C) Molten sodium as coolant as well as moderator (D) U-235 as fuel
Last Answer : (D) U-235 as fuel
Description : A heterogeneous reactor is the one, in which the moderator and the (A) Coolant are different materials (B) Coolant are present in different phases (e.g., heavy water and graphite) (C) Fuel are present in different phases (e.g. uranium and heavy water) (D) None of these
Last Answer : (C) Fuel are present in different phases (e.g. uranium and heavy water
Description : 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
Last Answer : (A) Ordinary water
Description : In a homogeneous nuclear reactor, the __________ are mixed together. (A) Fuel & coolant (B) Fuel & moderator (C) Coolant & moderator (D) None of these
Last Answer : (B) Fuel & moderator
Description : The moderator used in a nuclear reactor is – (1) Uranium (2) Radium (3) Ordinary water (4) Graphite
Last Answer : (3) Ordinary water Explanation: Light water (ordinary water) is used as the moderator in U.S. reactors as well as the cooling agent. It acts as the means by which heat is removed to produce steam for turning the turbines of the electric generators.
Description : The moderator used in a nuclear reactor is (1) Uranium (2) Radium (3) Ordinary water (4) Graphite
Last Answer : Ordinary water
Description : Coolant used in a fast breeder reactor is (A) Molten sodium (B) Heavy water (C) Ordinary water (D) Helium
Last Answer : (A) Molten sodium
Description : 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 ... , and it can be pressurised to attain a high temperature (D) All (A), (B) and (C)
Description : A fast reactor uses: w) an extremely short time to get to the maximum operating reactivity. x) uranium-235 as fuel. y) heavy water as a coolant. z) essentially unmoderated neutrons.
Last Answer : ANSWER: Z -- ESSENTIALLY UNMODERATED NEUTRONS.
Description : Which of the following is used as ‘a moderator in nuclear reactor?
Last Answer : – Graphite
Description : Which of the following is not used as a moderator in nuclear reactor? (A) Molten sodium (B) Light water (C) Beryllium (D) Boron hydride
Description : Which element is used as moderator in nuclear reactor? A. Light water B. Dense water C. Fresh water D. Heavy water (Answer)
Last Answer : D. Heavy water (Answer)
Description : State the function of following components of a nuclear power station: i) Moderator ii) Shielding iii) Control rod iv) Coolant
Last Answer : i) Function of Moderator :- Moderator is to moderate or reduce the speed of fast neutron to help the fission process. ii) Function of sheilding : Shielding is to protect environment, ... from reactor core and transfer it in heat exchanger for producing steam at high pressure and temperature.
Description : Reactors in commercial nuclear power plants in the U.S. are often referred to as thermal reactors. A thermal reactor uses: w) fissionable plutonium-239 as fuel. x) a relatively low heat output. y) neutrons moderated to relatively low energies. z) liquid sodium as a coolant.
Last Answer : ANSWER: Y -- NEUTRONS MODERATED TO RELATIVELY LOW ENERGIES.
Description : Which of the following is used as a moderator in nuclear reactors? (1) Thorium (2) Graphite (3) Ordinary water (4) Radium
Last Answer : (2) Graphite Explanation: Graphite is used a moderator in nuclear reactors.
Description : Ordinary water is not used as a moderator because, it (A) Has a low absorption cross-section (B) Has a low scattering cross-section (C) Absorbs neutrons (D) Does not absorb neutrons
Last Answer : (C) Absorbs neutrons
Description : Which of the following is used as a moderator in nuclear reactors ? (1) Thorium (2) Graphite (3) Ordinary water (4) Radium
Last Answer : Graphite
Description : Which reactor uses heavy water as moderator ?
Last Answer : CANDU.
Description : __________ moderator is used in a fast breeder reactor. (A) Graphite (B) Heavy water (C) Beryllium (D) No
Last Answer : (D) No
Description : Heavy water is used as a moderator in a (A) Pressurised water reactor (PWR) (B) Boiling water reactor (BWR) (C) Candu reactor (D) Molten sodium cooled reactor
Last Answer : (C) Candu reactor
Description : Which of the following may not need a moderator? (A) Candu reactor (B) Fast breeder reactor (C) Homogeneous reactor (D) Pressurised water reactor
Last Answer : (B) Fast breeder reactor
Description : What substance was used as a moderator for the chain reaction in the first nuclear reactor? w) graphite x) boron y) water z) cadmium
Last Answer : ANSWER: W -- GRAPHITE
Description : Net efficiency of ordinary light water cooled nuclear reactor is about __________ percent. (A) 32 (B) 52 (C) 72 (D) 88
Last Answer : (A) 32
Description : 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
Last Answer : (C) Is highly radioactive at elevated temperatures and can cause explosion, when it comes in contact with air or water
Description : Coolant used in a boiling water reactor is (A) Hydrogen gas (B) Water (C) Steam (D) A mixture of water & steam
Last Answer : (D) A mixture of water & steam
Description : A boiling water reactor is the one, in which the (A) Coolant water is allowed to boil in the core of the reactor (B) Coolant water, after being heated in the reactor core, generates steam ... water is pumped into the core (D) Fuel and the coolant are thoroughly mixed to form a homogeneous solution
Last Answer : (A) Coolant water is allowed to boil in the core of the reactor
Description : Secondary cooling circuit is a must in molten sodium cooled fast breeder reactor for (A) Achieving high degree of superheat in the steam (B) Faster heat removal rate from the core (C) ... circulation pressure (D) Avoiding the mixing of water with radioactive sodium, as it may cause explosion
Last Answer : (D) Avoiding the mixing of water with radioactive sodium, as it may cause explosion
Description : Pressure in a Pressurised Water Reactor (PWR) is used for (A) Maintaining constant pressure in the primary cooling circuit under varying loads (B) Superheating the steam (C) Pressurising the water in the primary coolant circuit (D) None of these
Last Answer : (A) Maintaining constant pressure in the primary cooling circuit under varying loads
Description : Coolant present in the primary circuit of a pressurised water reactor is high pressure (A) Sub cooled water (B) Saturated water (C) Superheated steam (D) Saturated steam
Last Answer : (B) Saturated wate
Description : Which of the following has the lowest Prandtl number? (A) Molten sodium (a coolant used in fast breeder reactor) (B) Water (C) Transformer oil (D) Dilute H2SO4
Last Answer : (A) Molten sodium (a coolant used in fast breeder reactor)
Description : Heavy water used as a coolant in nuclear reactor. Heavy Water is:
Last Answer : Water containing heavy Isotopes of Hydrogen atom
Description : Which of the following is used as ‘a moderator in nuclear reactor? -General Knowledge
Last Answer : The answer is 'Graphite '
Last Answer : answer:
Description : In a nuclear reactor the moderator is usually made of graphite placed between the fuel rods used to slow down neutrons all of the above none of the above?
Last Answer : Feel Free to Answer
Description : Neutrons are slowed down in a nuclear reactor by – (1) Fissionable Material (2) Moderator (3) Control rods (4) Cooling system
Last Answer : (2) Moderator Explanation: In thermal nuclear reactors, the coolant acts as a moderator that must slow down the neutrons before they can be efficiently absorbed by the fuel. It allows neutrons to slow down to energies where they can easily cause a nucleus to fission.
Description : Which reactor requires no moderator ?
Last Answer : Breeder reactor.
Description : Which reactor has no moderator ? Fast breeder reactor.
Last Answer : Fast breeder reactor.
Description : what is function of Moderator in nuclear reactor?
Last Answer : The moderator is a material which slows down the speed of the neutrons. The moderator is usually made from water but some reactors use graphite also.Neutrons released from the chain reaction must be ... moderator slows the neutrons down so that they can be captured and keep the chain reaction going.