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C. neutrons D. Hahn and Strassman B. pressurised water ANS:- A. D. Number of electrons B. protons A. Plutonium-239 B. CO2 gas cooled C. maintenance cost of the former is less. D. neither (a) nor (b) ASSUMPTIONS USED FOR EVALUATING THE POTENTIAL RADIOLOGICAL CONSEQUENCES OF A LOSS OF COOLANT ACCIDENT FOR BOILING WATER REACTORS' A. C. ? C. 92U235 + 0n1 56Ba143 + 36Kr90 + 3 0n1 + Q (energy) B. is less hard (in the range of silver). D. neither (a) nor (b). B. boiling water reactor (BWR). C. protons B. a and ß B. Pokhran C. linear ANS:- B. B. it may have isobars. D. none of these D. none of these. ANS:- D. 20) What is the average life of a radioactive atom having a ‘half life period’ of T? The radius of nucleus & atomic size are of the order of 10-12 cm & 10-8 cm respectively. ANS:- B, 8) Molten sodium is used as a coolant in a fast breeder reactor, because of its, A. excellent moderating properties. D. is unpredictable; may increase or decrease. D. reflects U-235. 11) An element having large number of __________ is most easily subjected to nuclear fission. B. electrons B. Ortho-hydrogen D. none of these. B. U-238 The name is a Russian acronym meaning, Ordinary water is used as the coolant and, graphite as the moderator. D. none of these A. C. Kalpakkam (Tamilnadu) ANS:- B. 92 B. is more efficient as gas has a higher specific heat. B. helium B. combustion C. a heavy liquid. Light water is muchmore abundant than heavy water, as it makes up 99.99% of natural water. D. thorium 1100 ANS:- D, A. pitchblende ANS:- B. ANS:- B, 137) Fast breeder test reactor at Kalpakkam is designed for using, A. thorium as a fertile material. Concrete A. acts both as an efficient coolant as well as a moderator. D. Carbon dioxide ANS:- B. These reactors pump water into the reactor core under high pressure to prevent the water from boiling. ANS:- A, 53) An ideal coolant for a nuclear reactor should, A. be a good absorber of neutrons. D. Korba More Information on reusing IAEA copyright material. A. thermal A. slows down D. Pitchblende B. monazite sand D. galena Your email address will not be published. ANS:- C. 59) Which of the following accounts for the maximum energy release in the nuclear fission process? ANS:- A, A. U-233 Reactors for propulsion applications use B. Ramagundam D. 32.97 ANS:- C, 200) Final product of uranium extraction plant at Jadugoda (Bihar) is, A. uranium The resulting steam is generally used directly to drive a turbine. ANS:- C. 73) Extraction of uranium from its ore is done by __________ method. D. Boiling water   Terms. B. neutrons ANS:- A. D. does not absorb neutrons. In fast nuclear reactors: liquid metals (mainly sodium) and also gases (for example, water vapor, helium). 78) The sum of masses of two nuclei produced in nuclear fission compared to the mass of original nucleus is, A. less D. None of these The liquid also prevents corrosion. D. U-232 Its half life period is __________ hours. 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. 105 B. can be heated to a higher temperature without pressurizing. Helium cooled ANS:- B, 82) Uranium Corporation of India Limited (UCIL) engaged in the mining & concentration of uranium ore is located at, A. Alwaye (in Kerala) C. Plutonium-239 C. first C. potential difference B. electronic configuration B. operating personnels ANS:- D. 157) __________ have the same mass number, but different nuclear charge. 235 B. Is This Answer Correct? C. superheated steam D. dissolving in water. In a PWR, the primary coolant is pumped under high pressure to the reactor core where it is heated by the energy released by the fission of atoms. C. plutonium D. fuel and the coolant are thoroughly mixed to form a homogeneous solution. A. Deuterium and tritium C. Uranium-233 219) Which of the following may not need a moderator? In a-decay, the ratio of neutron to proton decreases. It is one of three types of light water reactors, with the others being the boiling water reactor and the supercritical water cooled reactor. C. U-238 9.31 Mev In boiling water reactor, moderator is (a) coolant itself (b) ferrite rod (c) graphite rod (d) liquid sodium metal (e) blanket of thorium. The coolant used in boiling water reactor is (a) C02 (b) pressurized water (c) mixture of water and steam (d) liquid metal (e) mercury. C. normally employs molten sodium as coolant. B. higher specific heat. B. C. ?-rays A. D. Talchar (Orissa) A. U-235 B. less atomic weight and less atomic number. D. magnesium diuranate ANS:- D The most important feature of the Boiling Water Reactor (BWR) is that it uses light water (ordinary water) as a neutron moderator and a core coolant. ANS:- A. Kinetic energy of fission products 0.71 D. none of these D. chalcopyrite A. neutrons D. none of these. A. Graphite. ANS:- D, 149) Atoms with same number of neutrons, but different number of nucleons are called, A. isotones 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. D. none of these 0 Yes 1 No, 143) Fuel for a nuclear reactor (thermal) is, A. uranium 211) A boiling water reactor is the one, in which the, A. coolant water is allowed to boil in the core of the reactor. B. accelerating the neutrons. D. carbon 186) Sodium melts (at atmospheric pressure) at a temperature of __________ C. 187) Hydrogen bomb employs the nuclear fusion of, A. hydrogen A. Geiger-Muller Counter B. 118) Which of the following radiations is the least penetrating? A. protons B. proton C. same A. natural uranium fuelled heavy water cooled & moderated The water within the primary system passes over the reactor core to act as a moderator and coolant but does not flow to the turbine. ANS:- B. B. fuel. D. an oxide of heavier isotope of oxygen. D. Thorium-232 D. nucleus with one proton and one neutron. D. electrometallurgical electronics. 14) The number of neutrons in the nucleus of Uranium-233 (92U233) is. D. hydrogen? A. U-238 The general features that make a particular gas or liquid attractive as a reactor coolant are as follows: ANS:- A. Boiling water reactors BWRs There were 92 BWRs operating in nine countries of, countries, of which Japan and the United States, account for 64. D. monazite sand This preview shows page 6 - 8 out of 9 pages. ANS:- B, 231) The decrease in the atomic number is not observed in case of, A. electron capture D. The disintegration constant of a radioactive isotope is independent of pressure, temperature or concentration. The material that is used to transfer the heat from fuel to a turbine through the core like water, liquid sodium, heavy-water, helium, or something else is known as coolant. D. 12.73 A. B. pressure B. D. electrons C. absorption of neutrons in uranium atoms. B. Most Asked Technical Basic CIVIL | Mechanical | CSE | EEE | ECE | IT | Chemical | Medical MBBS Jobs Online Quiz Tests for Freshers Experienced. 22) Which of the following is a non-fissile material? ANS:- A, 189) In a nuclear explosion, the energy is released primarily in the form of __________ energy-, A. potential On the other hand, the, Figure 2.6: A boiling water reactor (BWR), Figure 2.5: A pressurised water reactor (PWR). uranium. ANS:- A, A. Kota and Baroda 43) Which of the following nuclear materials is fissile? D. protect the fuel element from coming in contact with the coolant. molten sodium) is preferred as a coolant in case of a/an __________ reactor. B. pressure C. 18/8 stainless steel D. neutron absorber 235) what is Nuclear Engineering? 86) Which of the following is present in Bhabha Atomic Research Centre (BARC) complex, Trombay (Bombay)? The coolant used is some kind of water. B. 162) The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about __________ metres/second. D. Alwaye production of heavy water requires a dedicated, concentration of much less than O.1% to the 99%, used in a CANDU reactor. D. Pu-239 C. iron C. kinetic B. uses faster neutrons for fission. 194) Energy equivlant to one atomic mass unit (amu) is __________ MeV. ANS:- B B. nucleus C. 931 MeV ANS:- D. 61) 75% of a radioactive element decays in 6 hours. A. ANS:- B, 122) Artificially produced radioactive isotopes are used for, A. power generation. D. none of these D. Tarapur (in Maharashtra). 60) Which of the following nuclear reactors is the most efficient thermodynamically while operating between the same temperature and pressure limits of the reactor? C. a-emission B. Kota (Rajasthan) D. None of these Is This Answer Correct? C. more atomic number B. Abundant availability of water. B. an oxide of deuterium. 66) Which of the following is the best nuclear fuel? C. water having dissolved salts of heavy metals. B. it will completely disintegrate in two months. ANS:- A. C. mildly alkaline (pH = 8) water. A. ANS:- D, 201) Molten sodium (as a coolant in fast breeder reactor), A. can’t attain high temperature at normal pressure. B. Kyanite ANS:- B. D. none of these. D. more atomic weight B. treatment of certain diseases. 1836 (approximately) C. isotones A. D. U-235 as fuel. ANS:- A, 154) Nuclides having the same atomic numbers are termed as, A. isotopes B. power generation on commercial scale. B. cooling it. D. none of these D. none of these D. J.J. Thomson C. Pu-239 D. neutrons 163) _________ moderator is used in a fast breeder reactor. 2 Yes 0 No. ANS:- D. 224) Which of the following is artificially produced as it does not occur in nature ? C. more than hydroelectric power generation capacity. 9.31 MeV C. Helium Ans: c. 84. D. Proximity to fuel source. C. neutrons & gamma 16) Nuclear power reactor located at Tarapur is of __________ type. 124) Which of the following reactors is operated at high neutron flux and low power level? ANS:- C, 132) Isotopes of an element have different, A. mass number D. Gopalpur coast (in Orissa) The reactor pump which acts as a reactor coolant pump is a centrifugal pump, which circulates the coolant necessary to carry away the decay heat. A. fission B. Cadmium ANS:- C, 40) The ratio of neutrons to protons of an element having a mass number and atomic number of 80 and 40 respectively is, 41) Function of control rod in a nuclear reactor is to control, A. temperature D. none of these. 1 Yes 0 No, 165) The ratio of atomic radius to its nuclear radius is about, A. 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 ANS:- C. 202) Which of the following is not, a fertile material? D. none of these. C. 3 x 1011 Water and steam are a common fluid used for heat exchange in the primary circuit (from surface of fuel rods to the coolant flow) and in the secondary circuit. A. radioactive C. resistance to effects of irradiation. 5) Pressure of CO2 gas (which is a coolant) in the Calder-Hall nuclear reactor is __________ kgf/cm2 . B. plutonium B. highly enriched uranium (85% U-235) fuelled C. chemical Water as a reactor coolant. 1.44 T ANS:- A, A. A. a & ß ANS:- D D. all (a), (b) and (c). C. less atomic weight and more atomic number. C. Number of protons D. thorium ANS:- D. 88) Which of the following is not used as a moderator in nuclear reactor? D. inverse square B. isobars ANS:- C. 230) The mass number of an element is not changed, when it emits __________ radiations. D. Boiling water reactor 102) Nucleus of 92U235 contains __________ protons. Molten sodium cooled D. Tritium 117) Hydrogen differs from deuterium in __________ properties. B. U-238 C. Homogeneous reactor B. processing of uranium ore. A. a-rays B. What is the ratio of the mass of a proton to that of an electron? C. thermonuclear B. less than 1 Yes 0 No, 221) Heat is generated in a nuclear reactor (thermal) by, A. combustion of a nuclear fuel e.g. B. coolant are present in different phases (e.g., heavy water and graphite). ANS:- B, 63) Out of the following places, heavy water plant is not located at, A. Baroda 227) Which is the most commonly used molten metal for cooling of nuclear reactors ? D. all (a), (b) and (c). C. position The water in the core is heated by nuclear fission … B. absorb the secondary neutrons. ANS:- B. ANS:- A, A. Positron is the antiparticle of electron. ANS:- C, A. barn ANS:- A, 193) “Critical mass” is the minimum mass of nuclear fissile material required for the, A. sustainment of chain reaction. B. coolant water boils in the core of the reactor. D. none of these 164) Which one is different for the neutral atoms of the isotopes of an element? D. Speed of a-rays is more than that of ?-rays. More than 65% of the commercial reactors in the United States are pressurized-water reactors or PWRs. D. 8? ANS:- D, 54) The phenomenon of nuclear fission is opposite to that of, A. radioactive decay 2 x 10 23 127) Heavy water has maximum density at __________ C. A. uses natural uranium as fuel. ANS:- A. D. much more B. graphite moderated While the. as the fuel, thereby eliminating the need, and cost, to enrich the uranium. B. uranium oxide ANS:- D. 152) Fast breeder nuclear reactors using enriched uranium as fuel may contain upto a maximum of __________ percent of U-235 (i.e. This feature allows, high availability but also increases the complexity, As regards gas-cooled reactors, 33 were in, commercial use only in the United Kingdom. D. all (a), (b) and (c). C. hafnium C. Candu reactor. A. Candu reactor ANS:- B ANS:- A. Loss of electrons from neutral atoms produces negative ions. See Fig. B. pressure C. molten sodium as coolant as well as moderator. 33) Extraction of uranium from its ore is done using __________ methods. C. has a better heat transfer characteristics, and it can be pressurised to attain a high temperature. ANS:- C, 46) Atoms of U-238 and U-235 differ in structure by three, A. electrons and three protons 153) A fertile material is the one, which can be, A. converted into fissile material on absorption of neutron. D. all (a), (b) and (c). ANS:- A, 116) Both tritium and deuterium have the same number of, A. neutrons C. In ordinary hydrogen, 1H1 and 1H2 are present in the ratio 6400:1. D. none of these B. deuterium C. Tuticorin (Tamilnadu) ANS:- B. The pressurized water reactor (PWR) is a type of nuclear reactor used to the generate electricity and propel nuclear submarines and naval vessels. D. Pressurised water B. pyrometallurgical D. none of these. C. The mass of deuterium atom is half that of helium atom. C. uranium carbide ANS:- C, A. Isotopes have the same number of protons & electrons, but different number of neutrons. 218) The amount of a radioisotope remaining undecayed after a time equal to four times its half life, will be __________ percent. B. Kaiga (Karnataka) Is This Answer Correct? 178) Which of the following is not used as a nuclear fuel cladding material? ANS:- B, 229) Which of the following is not a naturally occurring nuclear fuel, A. Uranium-238 B. Hydrogen D. all (a), (b) & (c) D. No ... be less likely to sustain core damage than the average PWR due to the robustness and redundancy of the Emergency Core Cooling System (ECCS). ANS:- C, 217) Commercial power generation from fusion reactor is not yet possible, because, A. it is difficult to control fusion reaction. D. Pu-239 B. C. marine ship propulsion. 135) The mass number of an element is equal to the number of __________ in the nucleus. B. mildly acidic (pH = 6) water. ANS:- A. B. ß-particle emission from a radioactive element makes it electrically positive. As with a BWR, the, coolant boils as it passes through the reactor and, the resultant steam is passed directly to turbine, Journal of Wind Engineering and Industrial Aerodynamics. B. is not at all corrosive, even at a higher temperature. This type of light water reactor has a … B. B. U-234 B. B. C. is highly radioactive at elevated temperatures and can cause explosion, when it comes in contact with air or water. C. Boiling water C. unused fuel ANS:- A. ANS:- D. 57) Liquid metal (e.g, . C. more chances of radiation damage. B. Kota (in Rajasthan). A. Deuterium ANS:- A, 144) Percentage of U-238 in natural uranium is around, A. 24 C. remains constant throughout. The disintegration rate of a radioactive substance can not be increased by heating it. D. velocity of the secondary neutrons. ANS:- B. D. nucleons D. none of these 1 reactor, was a boiling-water type. 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