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 : 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 : An important safety feature required at U.S. nuclear power plants that was not present at the Chernobyl Power Plant in the Soviet Union was the: w) reactor x) cooling water y) control rods z) containment building
Last Answer : ANSWER: Z -- CONTAINMENT BUILDING
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 most serious environmental pollution from a nuclear reactor is: w) radioactivity x) particulate formation y) thermal pollution z) noise pollution
Last Answer : ANSWER: Y -- THERMAL POLLUTION
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 : Which nuclear reactor uses water as a coolant, moderator and reflector ?
Last Answer : 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 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 : 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 : 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 : Neutrons are slowed down in a nuclear reactor by (1) Fissionable material (2) Moderator (3) Control rods (4) Cooling system
Last Answer : Moderator
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 : In a light-water reactor, the coolant is ordinary water. What is the moderator?
Last Answer : ANSWER: WATER or THE SAME WATER
Description : Of the following, which non-fissioning element is used in the cooling water of nuclear power plants to help control the rate of the fission reaction by absorbing neutrons: w) zirconium x) boron y) krypton z) cesium
Last Answer : ANSWER: X -- BORON
Description : Which of the following is NEVER used as a coolant in nuclear reactors: w) liquid nitrogen x) liquid sodium y) water z) helium gas
Last Answer : ANSWER: W -- LIQUID NITROGEN
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 : 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
Last Answer : (A) Protect the walls of the reactor from radiation damage
Description : In which reactor the coolant and moderator are the same ? Pressurised water reactor.
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 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 : Most of the new atoms formed when atoms in a nuclear reactor capture neutrons without fissioning are: w) fission products x) activation products y) actinides z) lead isotopes
Last Answer : ANSWER: Y -- ACTINIDES
Description : Of the following, which is the best fuel for a nuclear fusion reactor: w) hydrogen x) lithium y) deuterium z) helium
Last Answer : ANSWER: Y -- DEUTERIUM
Description : Which of the following is used as ‘a moderator in nuclear reactor?
Last Answer : – Graphite
Description : The main purpose of control rod in a nuclear reactor is to control the (A) Chain reaction and hence the power output by regulating the number of secondary neutrons causing fission (B) ... radiation (C) Conversion of fissile material into fertile material (D) Velocity of the secondary neutrons
Last Answer : (A) Chain reaction and hence the power output by regulating the number of secondary neutrons causing fission
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 : Why Thermal Power Plants are always situated by the side of rivers or lakes?
Last Answer : Thermal Power Plants are situated close to the rivers or lakes because to meet the large quantity of the water requirement. Water is required in the steam power plants steam in the boiler for cooling purposes such as in condensers as carrying medium such as in disposal of ash for drinking purpose
Description : What is the function of control rod in nuclear reactor?
Last Answer : These rods absorb neutrons and stop the chain reaction to proceed further.. Some control rods are made from an alloy of silver and cadmium. Some are made from boron mixed with iron or carbon. ... happens and the reactor gets colder.The control rods can used to shut the reactor down completely.
Description : __________ is not used as the control rod material in a nuclear reactor. (A) Cobalt (B) Hafnium (C) Cadmium (D) Boron
Last Answer : (A) Cobalt
Description : What come out from the the cooling tower of a nuclear power plant 1 smoke 2 cool air 3 hot air 4 none of theses
Last Answer : 1 smoke
Description : A metal ball on an insulated stand is touched by a positively charged glass rod. What happens to the metal ball? Does it w) gain protons and lose electrons x) gain protons y) gain more protons than electrons z) lose electrons
Last Answer : ANSWER: Z -- LOSE ELECTRONS
Description : A copper rod which is 1 centimeter in diameter carries a current of 5 amps. The current is distributed uniformly throughout the rod. The magnetic field half way between the axis of the rod and its ... ) zero. x) pointing radially outward y) pointing radially inward z) circles the axis of the rod
Last Answer : ANSWER: Z -- CIRCLES THE AXIS OF THE ROD
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 : 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 : 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.
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
Last Answer : (A) Molten sodium
Description : Which metal is used as the moderator in nuclear reactor?
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 : A moderator is used in nuclear reactor in order to ? A. Accelerate the neutrons B. Slow down the speed of the neutrons (Answer) C. Increase the number of elections D. Decrease the number of electrons E. None of these
Last Answer : B. Slow down the speed of the neutrons (Answer)
Description : Graphite is a/an (A) Electrical insulator (B) Allotrope of carbon (C) Moderator used in nuclear reactor (D) Both (B) and (C)
Last Answer : (C) Moderator used in nuclear reactor
Description : 1. Alpha-keratin is a protein present in which thing? 2. Where was the first session of the Constituent Assembly held? 3. Which of the following is used as a moderator in nuclear reactor? 4. ... place is the same as which place? 20. What was the script used in the earliest Tamil inscriptions?
Last Answer : Answer : 1. Wool 2. New Delhi 3. Graphite 4. Mars 5. Afghanistan 6. Bangladesh 7. 9 players each 8. Thyroid gland 9. Jupiter 10. Grama 11. Jawaharlal Nehru 12. Plutonium 13. After the drought ... Philosophy 16. A House for Mr. Biswas 17. Gambusia 18. Right to freedom 19. Celestial pole 20. Brahmi
Description : The moderator used in a nuclear reactor is (1) Uranium (2) Radium (3) Ordinary water (4) Graphite
Last Answer : Ordinary water