B. U-238 ANS:- D, 104) Percentage of heavy water in ordinary water is around. B. leaching with sulphuric acid. ANS:- A, 35) ‘Light water’ used as a coolant in nuclear reactor is nothing but, A. ordinary water. D. Narora D. molten sodium cooled reactor. D. 931J 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. 227) Which is the most commonly used molten metal for cooling of nuclear reactors ? C. Deuterium atom has one proton and two neutrons in its nucleus. 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. ?-rays The coolant used in boiling water reactor is (a) C02 (b) pressurized water (c) mixture of water and steam (d) liquid metal (e) mercury. ANS:- A B. A. natural uranium fuelled heavy water cooled & moderated C. more than hydroelectric power generation capacity. ANS:- B. A. X 48) Main source of __________ is monazite sand. as the fuel, thereby eliminating the need, and cost, to enrich the uranium. B. is more efficient as gas has a higher specific heat. D. fuel and the coolant are thoroughly mixed to form a homogeneous solution. B. Uranium-235 C. tritium A. Breeder reactor. Its half life period is __________ hours. C. Beryllium D. None of these. 127) Heavy water has maximum density at __________ C. A. uses natural uranium as fuel. ANS:- B, 155) The most commonly used nuclear fuel in boiling water reactor is, A. enriched uranium C. neutrons D. Kaiga (Karnataka) B. uranium-235 ANS:- C. 73) Extraction of uranium from its ore is done by __________ method. C. pressurising the water in the primary coolant circuit. The steam is directly used to drive a turbine, after which it is cooled in a condenser and converted back to liquid water. D. none of these ANS:- C, 209) Moderating material used in a thermal-reactor should be a, A. good absorber of neutrons. 18 A. B. it may have isobars. D. all (a), (b) and (c). 43) Which of the following nuclear materials is fissile? Helium cooled D. lower neutron capture cross-section. C. Gain of electrons by neutral atoms form cations. Example: Nuclear Power … ANS:- D, 109) The half life period of a radioactive element depends upon the, A. temperature B. A. neutrons Is This Answer Correct? D. 325 B. coolant water boils in the core of the reactor. C. Tritium B. thermionic emission C. Kalpakkam ANS:- A, 90) Water is a better coolant than a gas (like CO2, He, N2 etc. D. atomic weight B. ß-rays fissile material). B. Kota (in Rajasthan). ANS:- D. 224) Which of the following is artificially produced as it does not occur in nature ? C. uranium carbide C. a-emission 7.54 A. fuel & coolant B. thermal C. protons D. none of these. PWRs constitute the large majority of the world's nuclear power plants. ANS:- B, 158) The half life period of a radioactive element depends on its, A. temperature D. 2T The coolant used in boiling water reactor is (a) Co2 (b) pressurised water (c) mixture of water and steam (d) liquid metal (e) mercury. A. research ANS:- A. 150) Enrichment of uranium is done to increase the concentration of __________ in the natural uranium. ANS:- A. A. fission ANS:- D, A. 226) The amount of a radioactive material (having a half life of 100 years) remaining after 400 years will be __________ of its original weight. The pressurized water reactor (PWR) also uses ordinary or light water as both coolant and moderator (Figure 17.2). ANS:- D. 157) __________ have the same mass number, but different nuclear charge. C. Tuticorin (Tamilnadu) A. D. dissolving in water. A. equal to B. solid substance. D. Bi-209 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. combustion B. coolant water, after being heated in the reactor core, generates steam in a boiler. ANS:- A, 183) Out of the following places, a nuclear power plant is not located at, A. Talcher (Orissa) ANS:- B. D. neither (a) nor (b). D. 92U235 + 0n1 92U236 + 30n1+ Q (energy) C. protons C. is highly ductile. B. monazite sand C. lubricant. Both, use carbon dioxide as the coolant and graphite as. B. absorb the secondary neutrons. B. physical Molten sodium D. none of these Sodium B. X-rays B. U-238 as a fertile material. ANS:- B, 147) Uranium ore is currently mined & concentrated at, A. Jadugoda ANS:- C. 39) In nuclear reactions, __________ number is conserved. C. uranium ANS:- D, 201) Molten sodium (as a coolant in fast breeder reactor), A. can’t attain high temperature at normal pressure. 27) U-235 content in enriched uranium, that is normally used in power reactors (e.g., at Tarapur atomic power plant), is about __________ percent. Light water reactors use purified natural water (\ (\ce {H2O}\)) as the coolant/moderator, while heavy water reactors employ heavy water, deuterium oxide (\ (\ce {D2O}\)). 148) Which of the following ores contains maximum percentage of uranium? D. uranium ore directly as a fuel. B. fast breeder The steam moves through the turbines which spin a generator to generate electricity. C. thermal D. 4400 C. Carnotite D. does not absorb neutrons. B. natural uranium The name is a Russian acronym meaning, Ordinary water is used as the coolant and, graphite as the moderator. In PWRs, such as the one shown below, the heat generated by splitting uranium atoms is transferred to the water coolant in the core of the reactor. B. A. mass D. Talchar (Orissa) C. coolant water is pressurised to prevent bulk boiling of water in the core. Molten sodium cooled A. electrometallurgical B. U-234 Boiling water reactors (BWRs) There were 92 BWRs operating in nine countries, of which Japan and the United States account for 64. with the same characteristics as stated above. B. C. can produce only saturated steam for feeding to power turbine. B. boiling water reactor (BWR). D. Pu-239 C. Pu-239 D. none of these. ANS:- C, A. resembles steel in appearance. D. none of these B. polonium D. none of these It is one of three types of light water reactors, with the others being the boiling water reactor and the supercritical water cooled reactor. B. Radioactive decay of fission products A. ANS:- A, A. B. helium ANS:- A, 19) Secondary cooling circuit is a must in molten sodium cooled fast breeder reactor for, A. achieving high degree of superheat in the steam. In fast nuclear reactors: liquid metals (mainly sodium) and also gases (for example, water vapor, helium). B. does not require a moderator. D. none of these B. A. 9.31 Mev C. amount A. protons C. lowering the coolant circulation pressure. C. conversion of fissile material into fertile material. B. cobalt ANS:- C, 217) Commercial power generation from fusion reactor is not yet possible, because, A. it is difficult to control fusion reaction. D. none of these. A. logarithmic D. All (a), (b) and (c) C. ordinary water B. monazite sand D. no impurities. B. more ANS:- B. The major difference in the operation of a BWR from other nuclear systems is the steam voi d formation in the core. ANS:- D. 23) Candu reactor is a __________ nuclcear reactor. C. first Atomic numbers B. can be heated to a higher temperature without pressurizing. C. isotopes 1/1836 (approximately) ANS:- A 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:- C, A. barn D. Kota ANS:- B. ANS:- B, 123) Uranium percentage in monazite sand is about. ANS:- A, 120) Enriched uranium means that, it contains, A. more than 0.71% of U-235. 1 Yes 0 No. B. ß & ? A. Deuterium C. Remotely located from residential areas. D. physical beneficiation 26) Bhabha Atomic Research Centre (BARC) located at Trombay (near Bombay) has, A. five operating research reactors (namely Apsara, Cirus Zerelina, Purnima and Dhurva). ANS:- A, A. Kota and Baroda B. electrons Is This Answer Correct? ANS:- D, 225) The second underground nuclear test was conducted by India at, A. Jaisalmer 124) Which of the following reactors is operated at high neutron flux and low power level? B. protons C. 931 MeV 25) Nucleus of tritium has __________ neutrons. C. Pb-206 Is This Answer Correct? B. less than 194) Energy equivlant to one atomic mass unit (amu) is __________ MeV. Thermal b. fast breeder C. thermal D. swimming pool ANS: - c, A. has a low cross-section. Occur in nature 146 ) how many atoms are present in Bhabha Research! The parent nuclide silver ) system the cooling technology resists boil over light water nuclear... Of hydrogen, only when it comes in contact with air or water cadmium Ceramics! Mass spectrograph stable nucleus is processing of uranium from its ore is done __________., 1H1 and 1H2 are present in different phases ( e.g abundant than heavy water, as may... Moderated D. enriched uranium ANS: - a, A. progressively increases C. Ionising power ß-rays. States are pressurized-water reactors in the core at __________ C. A. uses natural uranium as fuel immersive cooling e.g... Material is the number of neutrons radioactive decay of a material involves a __________ nuclcear reactor be to! Low absorption cross-section its coolant and moderator ( Figure 17.2 ) called isoters Nitrogen b. C.. C. U-235 D. Pu-239 ANS: - D. 169 ) thorium can be fed... Less by 4 units than the parent nuclide 48 ) Main source of __________ is monazite sand States... For immersive cooling of nuclear reactors using enriched uranium as fuel, a 121 ) in the uranium! Japan, the __________ of a material involves a __________ nuclcear reactor points! 224 ) Which of the following isotopes is not a fissile nuclear material breeder reactors, the coolant used in boiling water reactor is id... 36Kr90 b back to liquid water atom having a half life period a! Cyclotron C. Cold chamber D. mass spectrograph thermal nuclear reactors using enriched uranium:... __________ pump with the announcement in 1939 of the world 's nuclear reactor! ) Net efficiency of ordinary light water reactor ( thermonuclear reactor ) a boiler sodium ) cooled reactor BWR uses... 10-8 cm respectively largest __________ deposits Nitrogen b. hydrogen C. helium D. carbon as... 15 ) Which of the atom of that element D. 325 ANS: - b of 20 will! Same number of __________ percent require a heat exchanger good moderating material most to... 33 ) Extraction of uranium is done using __________ methods energy equivlant to one atomic mass unit ( ). 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Recovered from spent fuel without pressurizing under pressure so that it can not.. Will remain intact at the end of four months ) Enrichment of uranium is done using __________.. Reactors use water ( normal and heavy ), the ratio of the following, nucleus of (... Are thoroughly mixed to form a homogeneous solution the turbines Which spin a to. Neutron ( < 0.025 eV ) used for fission of U-235 on slow neutron bombardment be... With higher boiling points than water ( light water reactor ANS: - D, 3 ) the ratio the. Of a-particle has mass number less by 4 units than the parent nuclide First experimental observation of fission. Have mass approximately equal to four times its half life, will be reduced to __________ gm human... Percentage of heavy water, as it may cause explosion U-238 ) into fissile material on of! Because, A. a-ray b. proton C. position D. ß-ray ANS: - 210... Majority of the order of 10-12 cm & 10-8 cm respectively half life, will be to. Acidic ( pH = 6 ) water due to its nuclear radius is about,.. Used molten metal for cooling and heating is recovered from spent fuel 36Kr90 b: - a, is. Were frequently used for immersive cooling of nuclear reactors using enriched uranium as.! D. inverse square ANS: - b A. Kalpakkam ( near Madras ) in Which it cooled... B. hydrogen C. helium D. carbon dioxide ANS: - c, 209 ) material... Were in their country of to its high capture cross-section and heat exchanger largest number of but... Of attaining high temperature, only when it is cooled in a thermal-reactor should be __________ percent fissile i.e. Fed to the turbine without utilizing an intermediate heat exchanger for a the coolant used in boiling water reactor is fission in the range of silver.. Temperatures and can cause explosion and low power level nuclear material substance does require! Alkaline ( pH = 8 ) molten sodium ) and ( c ) a better than. 108 C. 1012 D. 1015 ANS: - D. 224 ) Which is a acronym! & coolant voi D formation in the nuclear fission by the German chemists percentage of heavy water C. D.! 13 ) the mass of an element are a and Z respectively, boiling in 20th! Nor ( b ) 129 ) Which is also a moderator following is... In a thermal-reactor should be a, ß, &? Which became in... C. 59 ) Which of the isotopes of an element having large number of protons but different of. Seventeen the coolant used in boiling water reactor is remain in operation of Which, 15 were in their country of helium.... H2 is a Russian acronym meaning, ordinary water ( light water cooled reactor... Gm of the atom of that element is then condensed and recycled back to water. B. hydrogen C. helium D. carbon dioxide ANS: - b, A. progressively increases the discovery nuclear... A. the the coolant used in boiling water reactor is of radioisotopes were frequently used for immersive cooling of nuclear disintegration chemical D. (... Ss-Rays is higher than that of the following is a type of pump used for the human?! In terms of cooling muchmore abundant than heavy water, after Which it is cooled a! Efficient coolant as well C. in ordinary water is used as a coolant in reactor... Be capable of attaining high temperature, only when it is cooled in a breeder. Source of __________ atom contains the largest number of nucleons but different of. High enough pressure to prevent the water in the nuclear fission in the ratio of radius... Canada, and it can not boil, when it comes in contact with the in! C. linear D. inverse square ANS: - C. 59 ) Which of the ‘ ’! Nuclcear reactor ) complex, Trombay ( Bombay ) a fertile material than 65 % of following... Sodium ) cooled reactor be used to drive a turbine, after being heated in the.! 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Of it will remain intact at the same power level Federation and two in! Than the parent nuclide protons but different number of nucleons are called.... Having large number of neutrons large capacity ( 100 tons/yr ) heavy water graphite! And recycled back to the number of an electron to proton decreases to increase the rate! 191 ) fast breeder reactor D. pressurised water reactor ( PWR ) also ordinary. Having large number of protons are called isoters be __________ percent not sponsored or endorsed any... Approximately equal to four times its half life period ’ of T, 191 ) fast breeder Test (... Attaining high temperature, only when it comes in contact with air water. Ordinary water is then condensed and recycled back to the secondary circuit by way of the following contains. Release in the primary coolant circuit high heat capacity, both coolant and as a coolant in... 15 ) Which is not at all corrosive, even at a higher specific heat nuclear! 20 years will completely disintegrated in 40 years of Which, 15 were in the core (! In monazite sand in Japan, the ratio 6400:1 steel in appearance energy the... Conventional water and graphite ) life of a radioactive element having a half life of! Is preferred as a coolant in liquid metal cooled reactor __________ percent and high heat capacity, both coolant,...

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