D. none of these. C. Angstrom C. Mass of an electron is about 1/1800th of the lightest nucleus. D. neutron 2 x 10 23 B. electrons C. neutrons & gamma B. thermal efficiency of the former is higher. A. liquid metal cooled D. electrometallurgical B. a-particle D. saturated steam ANS:- C, 92) Pressure in a Pressurised Water Reactor (PWR) is used for, A. maintaining constant pressure in the primary cooling circuit under varying loads. C. chemical ANS:- A, 139) Number of secondary neutron emitted on fission of an atom of U-235 by slow neutron bombardment is, A. should have small absorption cross-section. A. Isotopes absence of a steam generator simplifies the design. If the half life period of a radioactive substance is one month, then, A. D. none of these. A boiling water reactor uses demineralized water as a coolant and neutron moderator. D. all (a), (b) and (c). electronics. D. fissioned by either slow or fast neutrons. D. swimming pool B. is more efficient as gas has a higher specific heat. B. accelerating the neutrons. B. working fluid in power turbine. ANS:- A, A. number of neutrons A. chemical ANS:- B, 198) A homogeneous reactor is the one, in which the, A. fissile atoms are evenly distributed throughout the mass of nuclear reactor. ANS:- A, 185) The ratio of volume of an atom to that of its nucleus is. D. U-232 C. 1-25 D. use of moderator is not required. B. plutonium Most common reactor type today. ANS:- B, 63) Out of the following places, heavy water plant is not located at, A. Baroda B. can be heated to a higher temperature without pressurizing. D. Tritium B. ß-rays B. Rutherford B. D. Pu-239 Thus the steam can be directly fed to the turbine without utilizing an intermediate heat exchanger. D. Pu-239 B. ß & ? A. homogeneous B. Deuterium C. Ceramics ANS:- C, 217) Commercial power generation from fusion reactor is not yet possible, because, A. it is difficult to control fusion reaction. D. a mixture of water & steam D. Th-232 ANS:- A, A. C. walls of the reactor ANS:- C. 39) In nuclear reactions, __________ number is conserved. A. uranium C. centrifugal B. B. U-238 C. Candu reactor. C. linear 226) The amount of a radioactive material (having a half life of 100 years) remaining after 400 years will be __________ of its original weight. In fast breeder reactors, liquid sodium id the coolant. D. Liquid metal (e.g., molten sodium) cooled reactor. B. Is This Answer Correct? ANS:- C, 58) In a pressurised water reactor (PWR), the, A. fuel is natural uranium and heavy water acts both as moderator & coolant. 5) Pressure of CO2 gas (which is a coolant) in the Calder-Hall nuclear reactor is __________ kgf/cm2 . Helium cooled C. radium ANS:- C. 100) Thorium-232 (a fertile material) on absorption of a neutron gets converted into __________ , which is a fissile material. D. ß-ray C. Pu-239 D. Kalpakkam (Tamilnadu) & a B. converts fertile material (e.g., U-238) into fissile material (Pu-239). B. D. Zinc Batangas State University - Alangilan • CEAFACS 1409954, RR01 - Nuclear Energy Today Chapter 1-2.pdf, Batangas State University - Alangilan • CEAFACS 101, Batangas State University - Alangilan • BB 2, Australian National University • STST 8026, Copyright © 2020. D. all (a), (b) and (c). C. is the first power reactor in India, which became critical in 1969. D. 36 This water is kept liquid under high pressure. 208) Ordinary water is not used as a moderator because, it, A. has a low absorption cross-section. Developing nuclear equipment, such as reactor cores and radiation shielding, Monitoring nuclear plant design, construction and operations to ensure that the plants meet safety standards, Writing instructions for the handling and disposal of nuclear waste, Testing whether methods of using nuclear material, reclaiming nuclear fuel or disposing of nuclear waste are acceptable, Taking corrective action or ordering plant shutdowns in emergencies, Examining nuclear accidents and gathering data that can be used to prevent future accidents. ANS:- B, 8) Molten sodium is used as a coolant in a fast breeder reactor, because of its, A. excellent moderating properties. A. hydrogen 111) A radioactive substance does not emit, A. a-ray ANS:- B. B. D. Boiling water 9.31 Mev B. water as coolant. B. Talcher (Orissa) Is This Answer Correct? C. position A. Calcium ANS:- D, 225) The second underground nuclear test was conducted by India at, A. Jaisalmer C. electron with positive charge. C. 14.4 T D. all (a), (b) and (c). C. Number of protons ANS:- A. A. Deuterium Clementine was the first liquid metal cooled nuclear reactor and used mercury coolant, thought to be the obvious choice since it is liquid at room temperature. ANS:- A. C. is highly ductile. B. an oxide of deuterium. Privacy In a-decay, the ratio of neutron to proton decreases. 166) The time required for half of the __________ of a radioactive isotope to decay is called its half life. ANS:- B. Electrons have negligible mass and unit negative change. B. fissioned by slow (thermal) neutrons. D. Both (b) and (c) D. all (a), (b) and (c). C. moderator. Molten sodium cooled C. Deuterium atom has one proton and two neutrons in its nucleus. C. pressurised water is pumped into the core. C. have high density, but low heat transfer co-efficient. C. 92U235 + 0n1 56Ba143 + 36Kr90 + 3 0n1 + Q (energy) ANS:- B, 123) Uranium percentage in monazite sand is about. The hot, pressurized water passes through a series of tubes inside the steam generator. 43) Which of the following nuclear materials is fissile? 227) Which is the most commonly used molten metal for cooling of nuclear reactors ? B. fermi B. Thorium-233 Boiling water reactors BWRs There were 92 BWRs operating in nine countries of, countries, of which Japan and the United States, account for 64. B. power generation on commercial scale. The radius of nucleus & atomic size are of the order of 10-12 cm & 10-8 cm respectively. B. But you need enriched Uranium to fuel such reactors, If you want to use natural uranium as fuel, your have to use heavy water as coolant. C. Tuticorin (Tamilnadu) Home » NUCLEAR ENGINEERING Interview Questions » 300+ TOP NUCLEAR ENGINEERING Interview Questions and Answers. A, ß-ray particle is identical with an electron. D. Heavy water 186) Sodium melts (at atmospheric pressure) at a temperature of __________ C. 187) Hydrogen bomb employs the nuclear fusion of, A. hydrogen These reactors pump water into the reactor core under high pressure to prevent the water from boiling. C. has a better heat transfer characteristics, and it can be pressurised to attain a high temperature. D. magnesium diuranate ANS:- D, 3) The disintegration rate of a radioactive element, A. progressively increases. D. 8? C. a heavy liquid. ANS:- A B. uranium oxide B. plutonium B. pyrometallurgical A. electromagnetic Concrete B. Pokhran D. homogeneous C. steam 105) Which of the following undergoes fission reaction easily? C. Ionising power of ß-rays is higher than that of a-rays. This preview shows page 6 - 8 out of 9 pages. ANS:- B, 137) Fast breeder test reactor at Kalpakkam is designed for using, A. thorium as a fertile material. ANS:- A. 162) The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about __________ metres/second. As mentioned before, light water is used as the coolant and moderator for a boiling water reactor. D. all (a), (b) and (c) A. fuel elements 194) Energy equivlant to one atomic mass unit (amu) is __________ MeV. This steam is then condensed and recycled back to the reactor core. ANS:- C, 76) The atomic mass of an element is fractional, because, A. of uncertainty principle. origin, Canada, and the remainder in Argentina, India, Pakistan, the Republic of Korea and. D. quantity of fuel required for initiating fusion reaction is prohibitively high. C. 3300 C. U-238 ANS:- B. D. 325 ANS:- D 48) Main source of __________ is monazite sand. D. Pressurised water Source: Nuclear Energy Institute website. 1 Yes 0 No, 161) 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. The heated, high pressure water then flows to a steam generator, where it transfers its thermal energy to lower pressure water of … C. fissioned by fast neutrons. 192) The type of pump used for the recirculation of molten sodium coolant in liquid metal cooled reactor is a/an __________ pump. 108 Is This Answer Correct? The resulting steam is generally used directly to drive a turbine. B. U-234 Power reactor C. plutonium B. thermionic emission Is This Answer Correct? A. radioactive A. 220) The time taken for a radioactive element to reduce to 50% of its original weight is __________ years, if its half life period is 12 years. D. 9 x 1021 C. outermost shell B. B. moderator C. both (a) & (b) B. mildly acidic (pH = 6) water. C. 6 x 10 32 B. physical D. isoters C. water having dissolved salts of heavy metals. D. Gamma rays are high energy electrons. ANS:- B, 158) The half life period of a radioactive element depends on its, A. temperature C. fuel consumption C. Gain of electrons by neutral atoms form cations. A. B. coolant water boils in the core of the reactor. B. Fermi C. faster heat removal capability from the core. A. nuclei C. slow down the secondary neutrons. 25) Nucleus of tritium has __________ neutrons. B. thermal D. None of these B. ß-emission C. economic power generation. The coolant used in boiling water reactor is (a) Co2 (b) pressurised water (c) mixture of water and steam (d) liquid metal (e) mercury. B. Kaiga (Karnataka) D. l/8th of it will remain intact at the end of four months. ANS:- D, 176) Specific gravity of uranium and plutonium is about, 177) The function of moderators in nuclear reactor is to, A. slow down the secondary neutrons. C. fast breeder B. absorbs D. avoiding the mixing of water with radioactive sodium, as it may cause explosion. A. Th-232 B. pyrometallurgical D. protect the fuel element from coming in contact with the coolant. C. The mass of deuterium atom is half that of helium atom. C. Helium D. Talchar (Orissa) ANS:- A, 154) Nuclides having the same atomic numbers are termed as, A. isotopes B. power C. Talcher C. absorbs neutrons. 31) First experimental observation of nuclear fission was done by, A. 1/1836 (approximately) B. 22) Which of the following is a non-fissile material? D. may increase or decrease depending on the material. ANS:- D. 12) Heavy water is preferred over ordinary water as a coolant, because it. ANS:- A. B. U-238 C. 931 MeV A. Breeder reactor. B. Uranium-233 D. none of these. C. treatment of spent fuel. D. neutron absorber C. protons B. be capable of attaining high temperature, only when it is pressurised. D. Korba 1 Yes 0 No, 221) Heat is generated in a nuclear reactor (thermal) by, A. combustion of a nuclear fuel e.g. Is This Answer Correct? ANS:- D. 224) Which of the following is artificially produced as it does not occur in nature ? D. No B. coolant are present in different phases (e.g., heavy water and graphite). C. less atomic weight and more atomic number. A. Pressurised water reactor D. Cadmium is capable of absorbing neutrons. B. a 420 MW nuclear power plant. A. ANS:- D, 54) The phenomenon of nuclear fission is opposite to that of, A. radioactive decay ANS:- A. C. uranium carbide C. U-235 146) How many atoms are present in one gm-atom of an element? D. absorption of neutrons ANS:- A 1 uranium and heavy water). C. Heavy hydrogen ANS:- C. 59) Which of the following accounts for the maximum energy release in the nuclear fission process? ANS:- B. C. tritium The major difference in the operation of a BWR from other nuclear systems is the steam voi d formation in the core. 219) Which of the following may not need a moderator? C. Kalpakkam C. Kalpakkam (Tamilnadu) In compariso… In a BWR, ordinary water acts as, both coolant and moderator. 153) A fertile material is the one, which can be, A. converted into fissile material on absorption of neutron. C. coolant water is pressurised to prevent bulk boiling of water in the core. A. Graphite C. Beryllium B. B. U-238 as a fertile material. ANS:- A, 183) Out of the following places, a nuclear power plant is not located at, A. Talcher (Orissa) B. highly enriched uranium (85% U-235) fuelled C. Fast breeder reactor D. Kota B. accelerating the reaction rate in the core. C. Molten sodium cooled reactor Atomic weights D. neutrons C. use fast neutrons for fission. < 0.025 B. ANS:- D, 191) Fast breeder Test Reactor (FBTR) is located at, A. Kalpakkam (near Madras). The steam-water mixture B. uranium hexaflouride 30) The half life period of a radiactive element is 100 days. A. The reactor is kept at a high enough pressure to prevent boiling. There, are two types, the Magnox (named from the, magnesium alloy used to clad the fuel elements), and the advanced gas-cooled reactor (AGR). C. iron Example: Nuclear Power … D. an oxide of heavier isotope of oxygen. B. X-rays A. chemical D. surrounding it by neutron absorbing material. A. Graphite. B. Uranium-235 D. Number of electrons In a PWR (Fig 2), heat from the reactor core is used to heat the primary reactor coolant at temperatures over 300°C. C. nuclear fusion D. thorium ANS:- B, 155) The most commonly used nuclear fuel in boiling water reactor is, A. enriched uranium C. Homogeneous reactor B. it may have isobars. B. has much lower melting point (640C ) compared to thorium (1690C). D. poorer corrosion resistance. ANS:- D, 104) Percentage of heavy water in ordinary water is around. Liquid metal cooled reactor. B. neutron breeding capability. C. Tritium ANS:- B, A. U-235 B. D. nucleus with one proton and one neutron. D. mm C. power generation. C. limonite C. A radioactive element having a half life period of 20 years will completely disintegrated in 40 years. 6) The electric power generation cost in nuclear power plant is less than that in a coal based thermal power plant, mainly because the, A. fuel cost per unit power generated is less. C. lowering the coolant circulation pressure. C. radium B. Cyclotron ANS:- D, 206) Fission of U-235 on slow neutron bombardment can be represented by, A. ANS:- A. D. Thorium-232 D. combustion C. U-239 ), because it, A. is a better neutron moderator as well. B. is not at all corrosive, even at a higher temperature. Nuclear engineering was born in the 20th century with the announcement in 1939 of the discovery of nuclear fission by the German chemists. B. low strength at high temperature. C. faster heat removal capability from the core. uranium. C. molten sodium as coolant as well as moderator. C. amount ANS:- B D. monazite sand ANS:- D. 57) Liquid metal (e.g, . A. Deuterium and tritium D. fast breeder 133) Biological shield is provided in a nuclear power reactor to protect the __________ from radiation damage. A. slows down C. more than hydroelectric power generation capacity. D. Boiling water reactor B. ANS:- D D. 1015 96) Which is not a fissile nuclear material? B. emission of hazardous radiation. Water as a reactor coolant. D. Narora A. A. B. ANS:- B. C. initiating nuclear fission and fusion. Boiling water reactors (BWRs) There were 92 BWRs operating in nine countries, of which Japan and the United States account for 64. Fast breeder reactor ANS:- C. 131) Nuclear reactors are provided with shield to guard against the emission of mainly __________ rays. ANS:- A, 126) Ceramic nuclear metals compared to solid nuclear metals have, A. higher melting points. D. none of these A. U-235 D. carbon ANS:- A, 120) Enriched uranium means that, it contains, A. more than 0.71% of U-235. Heat is produced by nuclear fission in the reactor core, and this causes the cooling water to boil, producing steam. 1 Yes 0 No, 223) Gas cooling as compared to water cooling of nuclear reactors, A. can not attain a high temperature. ANS:- C, 200) Final product of uranium extraction plant at Jadugoda (Bihar) is, A. uranium C. 3 x 1011 ANS:- C, A. C. marine ship propulsion. ANS:- B. B. polonium B. higher specific heat. The pressurized water reactor (PWR) also uses ordinary or light water as both coolant and moderator (Figure 17.2). C. chemical ANS:- C. 174) If 4 gm of a radioisotope has a half life period of 10 days, the half life of 2 gm of the same istotope will be __________ days. 232) Which of the following may be used to measure the rate of nuclear disintegration? B. electrons C. nuclear charge D. none of these D. none of these A. mass INTRODUCTION S.'i'Cllil 50..;,I •it fI I('FR PlaII 50( eiliuir ls th:t each:1pl'icailll l a ,oittl lrlic t n pli l ilil ltm or olperaling lic•tise 3000 MW. Unlike the pressurized water reactor (PWR), it does not have a steam generator. 178) Which of the following is not used as a nuclear fuel cladding material? 1 Yes 0 No. C. protons C. ? B. Hydrogen has two isotopes. B. fast breeder D. fuel and the coolant are thoroughly mixed to form a homogeneous solution. B. a-rays ANS:- A. B. A. thorium ANS:- A, 74) Radioactivity of an isotope is expressed in, 75) A heterogeneous reactor is the one, in which the moderator and the, A. coolant are different materials. The steam moves through the turbines which spin a generator to generate electricity. D. Positron is heavier than a proton. Heat is produced by nuclear fission in the reactor core, and this causes the cooling water to boil, producing steam. 235) what is Nuclear Engineering? B. same substance (e.g. B. less atomic weight C. 0.71 C. Rescolite B. pressurised water C. protons B. Rawatbhata (Rajasthan) This water is then returned to the reactor core, completing the loop. D. U-235 as fuel. B. U-235 A. fuel & coolant 0.015 ANS:- A, 53) An ideal coolant for a nuclear reactor should, A. be a good absorber of neutrons. B. a and ß The characteristic of coolant mainly include melting point is low, the boiling point is high, non-toxicity, less viscosity, the stability of … D. 931 J D. none of these D. Pu-239 Keywords . The steam is directly used to drive a turbine, after which it is cooled in a condenser and converted back to liquid water. Research reactor C. U-235 C. ?-rays B. has an installed capacity of 400 MW. ANS:- D, 136) In the gaseous diffusion process of uranium enrichment, the natural uranium is converted into gaseous, A. uranium oxide ANS:- B. D. neutrons plus protons (i.e., nucleons) fissile material). D. None of these. with the same characteristics as stated above. Reactors for propulsion applications use B. it will completely disintegrate in two months. B. boiling water reactor (BWR). C. deuterium D. retarder of neutron velocity. There are many ways in which it could be used. B. Jadugoda (in Jharkhand) B. Radioactive decay of fission products C. amount of element present D. uranium ore directly as a fuel. D. Pressurised water reactor B. faster heat removal rate from the core. D. fission of U-235 by neutrons.? ANS:- B, 229) Which of the following is not a naturally occurring nuclear fuel, A. Uranium-238 33) Extraction of uranium from its ore is done using __________ methods. Is This Answer Correct? C. Roentgen ANS:- A, A. U-233 130) Radioactive decay of a material involves a __________ order reaction. U-235. B. Tuticorin ANS:- B D. all (a), (b) and (c). D. helium ANS:- A, 212) Spent fuel from the nuclear thermal reactor contains, A. fission products D. neither (a) nor (b). D. none of these C. can produce only saturated steam for feeding to power turbine. Light water is muchmore abundant than heavy water, as it makes up 99.99% of natural water. B. Hydrogen B. requires comparatively smaller pumps and heat exchanger for a given heat transfer rate. C. a-emission A. natural uranium fuelled heavy water cooled & moderated 112) Out of the following, nucleus of __________ atom contains the largest number of neutrons. B. deuterium While the. 211) A boiling water reactor is the one, in which the, A. coolant water is allowed to boil in the core of the reactor. C. same WR — Water Reactor. ANS:- C. 202) Which of the following is not, a fertile material? D. The product formed by emission of a-particle has mass number less by 4 units than the parent nuclide. D. 29.71 ANS:- A, A. the production of radioisotopes. B. Pokharan The cooling water is maintained at about 75 atm (7.6 MPa, 1000–1100 psi) so that it boils in the core at about 285 °C (550 °F). C. Instantaneous release of ?-rays ANS:- C, 71) Nuclear power plant is not located at, A. Talcher (Orissa) 78) The sum of masses of two nuclei produced in nuclear fission compared to the mass of original nucleus is, A. less D. ultra violet rays ⇒ The coolant used in boiling water reactor is C02 pressurized water mixture of water and steam liquid metal ⇒ A pressurized water reactor employs pressurizer for the following application to maintain constant pressure in primary circuit under varying load to Supply high pressure steam to increase pressure of water in primary circuit C. Thorium 15) Which of the following gases has very high neutron capture cross-section, making it unsuitable as a coolant in nuclear reactor? ANS:- B. D. none of these. Molten sodium ANS:- C, 45) Heavy water (D2O) in a nuclear reactor serves as a, A. coolant ANS:- B, 82) Uranium Corporation of India Limited (UCIL) engaged in the mining & concentration of uranium ore is located at, A. Alwaye (in Kerala) B. more The heat from the primary water circuit is then transferred to the secondary circuit by way of the pressurized liquid. D. none of these. B. Kota (in Rajasthan). C. Khetri A. U-238 ANS:- D. 152) Fast breeder nuclear reactors using enriched uranium as fuel may contain upto a maximum of __________ percent of U-235 (i.e. B. the fuel required (e.g. heavy water) is used as moderator & coolant. D. inverse square C. deuterium 181) Which of the following types of nuclear reactors is most prone to radioactive hazards? 87) Which of the following isotopes is not present in natural uranium? MSR — Molten Salt Reactor. 6.31 ANS:- B, 125) Uranium ore is mined & concentrated in India at, A. Jadugoda(Jharkhand) D. Rescolite C. lubricant. D. plutonium-239 In a BWR, ordinary water acts as both coolant and moderator. B. Bacquerrel D. Tuticorin B. Ortho-hydrogen Is This Answer Correct? B. electronic configuration C. coolant & moderator The vapor of the boiling fluid coolant is often used as the working fluid in the turbine [e.g., steam generated within a boiling water-cooled reactor is used directly in a steam turbine]. ANS:- B. ANS:- A. A. C. Pu-239 ASSUMPTIONS USED FOR EVALUATING THE POTENTIAL RADIOLOGICAL CONSEQUENCES OF A LOSS OF COOLANT ACCIDENT FOR BOILING WATER REACTORS' A. D. Stainless steel. ANS:- B, 134) Mass of a positron is same as that of a/an, A. electron 127) Heavy water has maximum density at __________ C. A. uses natural uranium as fuel. Copyright 2020 , Engineering Interview Questions.com. ANS:- A, 193) “Critical mass” is the minimum mass of nuclear fissile material required for the, A. sustainment of chain reaction. ANS:- A, 189) In a nuclear explosion, the energy is released primarily in the form of __________ energy-, A. potential Water in light water reactors. B. D. positron emission? D. use molten sodium as coolant. Ans: c. 84. In the BWR the water in the reactor core is permitted to boil under a pressure of 75 atmospheres, raising the boiling point to 285°C and the steam generated is used directly to drive a steam turbine. ANS:- D. 169) Thorium can be converted into U-233 in a __________ reactor. D. thorium See Fig. ANS:- A, 35) ‘Light water’ used as a coolant in nuclear reactor is nothing but, A. ordinary water. ANS:- C, 10) Coolant used in a fast breeder reactor is, A. molten sodium ANS:- B, A. nucleus having two protons. Absence of earthquake prone zone in nearby areas. C. Candu reactor. D. accelerating the neutrons. A. D. 4400 D. none of these The BWR uses ordinary water (light water) as both its coolant and its moderator. ANS:- B. B. uranium-235 ANS:- B. as the fuel, thereby eliminating the need, and cost, to enrich the uranium. D. velocity of the secondary neutrons. molten sodium) is preferred as a coolant in case of a/an __________ reactor. B. nuclear C. mildly alkaline (pH = 8) water. ANS:- C. 17) Which of the following is not an ore of uranium? ANS:- A. D. 931J After 400 days, one gm of the element will be reduced to __________ gm. C. thermonuclear ANS:- D. 182) Thermal neutrons which are used to cause the fission of U-235 have energy __________ eV. B. second B. combustion C. protons ANS:- A, 99) The critical mass of a fissionable material can be reduced by, A. heating it. The liquid also prevents corrosion. A. C. Isotones On the other hand, the, Figure 2.6: A boiling water reactor (BWR), Figure 2.5: A pressurised water reactor (PWR). D. electrical 0.71 C. natural uranium C. ordinary water Is This Answer Correct? ANS:- A, A. Kota and Baroda B. C. the fuel and the moderator is mixed to form a homogeneous material. How are these different from pressurized-water reactors in terms of cooling? > 1 B. absorb the secondary neutrons. D. it may have isotopes. A. C. pressurising the water in the primary coolant circuit. ANS:- A. ANS:- A More Information on reusing IAEA copyright material. B. processing of uranium ore. D. Proximity to fuel source. B. helium nucleus. C. cassiterite D. zero B. helium Ans: c. 84. A. B. reciprocating ANS:- D, 168) 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. ANS:- C. 69) Which of the following is a fuel for a fusion reactor (thermonuclear reactor)? ANS:- C. 9) Which of the following is the most harmful for the human being? D. much more ANS:- D. 214) Thorium-232 is converted into uranium-233 in a/an __________ nuclear reactor. 118) Which of the following radiations is the least penetrating? B. C. breeding neutrons. D. Th-236 The compact SMR design is a 300-megawatt electric light water reactor that is based on proven and licensed boiling water reactor technology that was previously supported through the U.S. Department of Energy's Nuclear Power 2010 program. D. All (a), (b) and (c) D. is unpredictable; may increase or decrease. D. none of these D. none of these. D. Narora D. lower neutron capture cross-section. C. 0.015 B. fusion of atoms of uranium. ANS:- C. 98) Primary purpose of a __________ nuclear reactor is to supply a high neutron flux of the order of 1013 to 1014 neutrons/cm2 second. - D, A. nucleus having two protons % of the following radiations the... Cross-Section, making it unsuitable as a moderator 14 ) the ratio of radius... Or university utilizing an intermediate heat exchanger to supply steam to power turbine moderator for a nuclear fission in nucleus... Can cause explosion, when it is cooled in a condenser and converted back to the turbine generators to produce... As gas has a … Waterless coolant is used as a moderator )... At, A. progressively increases ) nor ( b ) and also gases for! Ordinary hydrogen, 1H1 and 1H2 are present in different phases ( e.g 325 ANS: D. C, A. lower density resulting steam is directly used to measure the rate of nuclear fission by the chemists... None of these ANS: - C. 69 ) Which of the order of 10-12 cm & 10-8 cm.... Thermal D. swimming pool ANS: - C. 199 ) Which of the density the. Ratio 6400:1 a high temperature need, and This causes the cooling resists... Generator to generate electricity end of four months following factors is the ratio of atomic radius to its capture., liquid sodium id the coolant and moderator remain intact at the end of four months ) compared to (! Ratio 6400:1 to proton decreases can cause explosion a-decay, the cooling water boil! D. inverse square ANS: - b, A. nucleus having two.... 370F ), ( b ) and ( c ) than heavy water plant:... Stainless steel ANS: - a is This Answer Correct are?,... Air or water reactor ) is generally made of boron, hafnium or cadmium ß-ray. Extraction of uranium from its ore is done using __________ methods of ordinary light cooled... __________ MeV at high neutron flux and low power level has one and... 400 days, one gm of the following radiations is the ratio of of! In India, Which became Critical in 1969 cooling properly in Japan, the liquid as! Seventeen RBMK remain in operation of a radioactive element, A. nucleus having two protons is most to... To thorium the coolant used in boiling water reactor is 1690C ) often, the ratio of neutron for experiments... Resists boil over stable nucleus is gas ( Which is the steam moves through the turbines Which spin generator..., ß, and This causes the cooling water is not sponsored or endorsed by any college university. Zircalloy ( an alloy of zirconium and aluminium ) D. swimming pool ANS: - D is This Correct... Is artificially produced as it may cause explosion C. has a mass that is __________. A heat exchanger for a nuclear fuel cladding material a/an __________ nuclear reactor is under... Water ( light water cooled nuclear reactor due to its high neutron capture cross-section making... Mentioned before, light water reactor ANS: - C. 9 ) Which of the following isotopes is present. So that it can not be increased by heating it C. Ionising power of ß-rays higher. 135 ) the ratio of mass of a neutron to proton, A. increases radiactive is... The fuel element from coming in contact with the announcement in 1939 of following... Of CO2 gas ( Which is not sponsored or endorsed by any college or university also a...., Canada, and cost, to enrich the uranium of our largest __________ deposits ) material! Coolant than CO2, due to its high capture cross-section, making it as. So that it can be pressurised to attain a high temperature attaining high temperature, only when it in... From pressurized-water reactors or pwrs ( PWR ), ( b ) and ( b and. With water as a coolant and as a coolant in a homogeneous solution &. Thermal nuclear reactor is a coolant in case of a/an __________ pump A. good absorber of neutrons in core. A. logarithmic b. exponential C. linear D. inverse square ANS: - D, )... Moves through the turbines Which spin a generator to generate electricity the coolant D. 20 ) what is First...? 1 56Ba143 + 36Kr90 b % of the ‘ nucleus ’ to that of the following may be.. - D. 169 ) thorium can be represented by, a increase or depending. One proton and two neutrons in its nucleus is cooled nuclear reactor Thorium-232 converted... Reactor in India, Pakistan, the Republic of Korea and D. all ( a ) (. And heavy ), it, A. progressively increases D. swimming pool ANS -. ) Velocity of the element will be __________ the neutron binding energy the! Answer Correct one proton and two in, six countries, of Which, 15 were the! India, Pakistan, the __________ from radiation damage and, graphite as the and. __________ nuclear reactor, because it, A. increases a doubly charged helium ion Plutonium-239 none! Uranium ore. C. treatment of spent fuel the core decay of a hydrogen atom is that. College or university the First power reactor to protect the fuel, thereby eliminating the need, and This the. 56Ba143 + 36Kr90 b selection for a boiling water reactors - Advantages and Disadvantages Advantages... Reactor has a … Waterless coolant is used as moderator its nucleus.! Life, will be __________ the neutron binding energy of the ‘ nucleus ’ to that an! Use the BWR uses ordinary water ( around 370F ), ( b ) a turbine, after heated. Z respectively is done to increase the concentration of __________ is most easily to!: liquid metals ( mainly sodium ) is __________ kgf/cm2 light water around... Causes the cooling water to the coolant used in boiling water reactor is, producing steam element will be reduced __________! Ratio 6400:1 ( mainly sodium ) cooled reactor is about 1012 D. 1015 ANS -! 129 ) Which of the __________ are mixed together 148 ) Which the! Is pressurised highly radioactive at elevated temperatures and can cause explosion, when it is pressurised C. 210 Which. B. nuclear C. physical D. none of these ANS: - b ; hence core volume for a boiling reactor... Around 370F ), ( b ) converted back to the turbine without utilizing an intermediate heat to. Nuclear radius is about 1839 of Which, 15 were in the nuclear fission in the ratio of radius... 69 ) Which is the history of nuclear fission lightest nucleus Russian acronym meaning, ordinary water as... Speed of a-rays is more than 65 % of natural water 1H2 are present the! Because it, A. is a better coolant than CO2, due to nuclear... Its availability and high heat capacity, both for cooling and heating is a/an __________ nuclear reactor low level... Out of a proton to neutron ratio in a BWR, ordinary water is muchmore abundant than heavy water the... ) neutrons have mass approximately equal to four times its half life period of a remaining. Equivlant to one atomic mass of an element is 100 days pwrs constitute the large of... With an electron has a mass that is approximately __________ that of an element is fractional, of! A. Plutonium-239 b. Uranium-235 C. Uranium-233 D. Thorium-232 ANS: - b power generation capacity India... To one atomic mass of deuterium atom is half that of __________ the... Enrich the uranium, one gm of the following radiations is the steam be... Country of for half of the following reactors is most prone to radioactive hazards announcement in 1939 the. 1939 of the mass of a radioactive element, A. use Th-232 as fissile.. A steam generator remain in operation of a neutron to that of its A. excellent moderating.!, because of our largest __________ deposits it will remain intact at the same power level ) Which one different! Run at the same power level boiling water reactor uses demineralized water as a coolant and moderator the of. ( Which is the radioactive isotope of hydrogen, of Which, 15 were in ratio! In a-decay, the one, Which is not, a alkaline ( pH = 8 ) molten sodium in... The human being and neutron moderator also a moderator for immersive cooling of nuclear fission there are many ways Which. 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