The PWR differs in another respect from the boiling water … ANS:- D C. uranium carbide C. protons D. none of these 0.71 C. absorbs neutrons. B. fuel. Boiling Water Reactor Plant Inside the boiling water reactor (BWR) vessel, a steam water mixture is produced when very pure water (reactor coolant) moves upward through the core abso rbing heat. With higher boiling points than water (around 370F), the cooling technology resists boil over. ANS:- C, 76) The atomic mass of an element is fractional, because, A. of uncertainty principle. D. None of these C. Kalpakkan As mentioned before, light water is used as the coolant and moderator for a boiling water reactor. B. ß-particle emission from a radioactive element makes it electrically positive. C. Boiling water Light water is muchmore abundant than heavy water, as it makes up 99.99% of natural water. ANS:- B, 155) The most commonly used nuclear fuel in boiling water reactor is, A. enriched uranium C. uranium carbide B. low strength at high temperature. D. molten sodium cooled reactor. A. homogeneous 62) The phenomenon of radioactivity was discovered by, A. Madam Curie B. U-235 C. 931 Mev The resulting steam is generally used directly to drive a turbine. The water in the core is heated by nuclear fission … B. mildly acidic (pH = 6) water. ANS:- B, 147) Uranium ore is currently mined & concentrated at, A. Jadugoda B. B. water as coolant. 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. ANS:- D. 204) Which of the following is a moderating material used in nuclear reactor ? Is This Answer Correct? C. Candu reactor. 1836 (approximately) ANS:- C, 95) Nuclear fuel usually used in a Boiling Water Reactor (BWR) is, A. plutonium C. a-emission ANS:- D, 51) The molecular weight of heavy water is, 52) The size of an atom is of the order of one, A. Angstrom B. D. none of these. C. pressurised water is pumped into the core. 194) Energy equivlant to one atomic mass unit (amu) is __________ MeV. D. Korba 130) Radioactive decay of a material involves a __________ order reaction. C. lowering the coolant circulation pressure. D. be free from radiation damage and non-corrosive. C. 0.015 ANS:- B, 125) Uranium ore is mined & concentrated in India at, A. Jadugoda(Jharkhand) D. The disintegration constant of a radioactive isotope is independent of pressure, temperature or concentration. D. boron or cadmium. D. neutrons C. more chances of radiation damage. C. 6 Atomic numbers B. B. uranium 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. 931 eV D. Curie ANS:- A. D. Boiling water reactor Most common reactor type today. B. 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). B. CO2 gas cooled A. D. U-235 as fuel. ANS:- A. Boiling Water Reactors - Advantages and Disadvantages - Advantages. Light water reactors use purified natural water (\ (\ce {H2O}\)) as the coolant/moderator, while heavy water reactors employ heavy water, deuterium oxide (\ (\ce {D2O}\)). C. faster heat removal capability from the core. D. zero ANS:- A. C. Pu-239 ANS:- A C. boiling water Molten sodium C. 18/8 stainless steel C. Fermi C. a very large capacity (100 tons/yr) heavy water plant. B. U-235 D. No 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. C. Instantaneous release of ?-rays D. none of these D. Thorium-232 86) Which of the following is present in Bhabha Atomic Research Centre (BARC) complex, Trombay (Bombay)? ANS:- A. B. saturated water D. 5 x 10 5 C. Remotely located from residential areas. Helium cooled D. Boron hydride This water is kept liquid under high pressure. The liquid also prevents corrosion. See Fig. D. Zinc D. none of these. ANS:- C. 73) Extraction of uranium from its ore is done by __________ method. B. working fluid in power turbine. 178) Which of the following is not used as a nuclear fuel cladding material? C. electronic configuration ANS:- C, 58) In a pressurised water reactor (PWR), the, A. fuel is natural uranium and heavy water acts both as moderator & coolant. Is This Answer Correct? D. nucleus with one proton and one neutron. C. protons B. has an installed capacity of 400 MW. C. electron with positive charge. A. Pitchblende Is This Answer Correct? D. none of these. A. ANS:- D, 149) Atoms with same number of neutrons, but different number of nucleons are called, A. isotones B. pyrometallurgical 148) Which of the following ores contains maximum percentage of uranium? ANS:- C. 131) Nuclear reactors are provided with shield to guard against the emission of mainly __________ rays. D. Bi-209 The steam moves through the turbines which spin a generator to generate electricity. D. none of these 133) Biological shield is provided in a nuclear power reactor to protect the __________ from radiation damage. D. isoters B. Rutherford C. tritium 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. 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. D. more than thermal power generation capacity. C. Carnotite B. coolant water, after being heated in the reactor core, generates steam in a boiler. C. only fissile material. Most Asked Technical Basic CIVIL | Mechanical | CSE | EEE | ECE | IT | Chemical | Medical MBBS Jobs Online Quiz Tests for Freshers Experienced. Example: Nuclear Power … ANS:- B. ANS:- A, A. pitchblende ANS:- C. 203) The atomic number of an element is equal to the number of __________ present in its atom. D. may increase or decrease depending on the material. B. Cyclotron   Privacy C. 14.4 T ANS:- A, 154) Nuclides having the same atomic numbers are termed as, A. isotopes ANS:- A B. neutrons B. has much lower melting point (640C ) compared to thorium (1690C). C. coolant water is pressurised to prevent bulk boiling of water in the core. ANS:- A, 184) Research reactors are normally meant for, A. producing high neutron flux 1012-1013 neutrons/cm2, sec and studying the effect of neutron bombardment on dif ferent materials. D. Boiling water ANS:- A, 24) Percentage of natural uranium present in uranium ore found in Jadugoda (Jharkhand) is. B. fermi C. 3 x 1011 ANS:- D. 20) What is the average life of a radioactive atom having a ‘half life period’ of T? B. ANS:- A D. Speed of a-rays is more than that of ?-rays. C. U-239 A. The pressurized water reactor (PWR) also uses ordinary or light water as both coolant and moderator (Figure 17.2). D. protect the fuel element from coming in contact with the coolant. D. none of these. 94) In ß-decay of radioactive material, the ratio of neutron to proton, A. increases. ANS:- A, 35) ‘Light water’ used as a coolant in nuclear reactor is nothing but, A. ordinary water. C. steam ANS:- A, A. 164) Which one is different for the neutral atoms of the isotopes of an element? D. none of these Source: Nuclear Energy Institute website. D. magnesium diuranate B. This type of light water reactor has a … C. treatment of spent fuel. D. atomic weight D. ß-ray B. faster heat removal rate from the core. ANS:- A C. Tuticorin(Tamilnadu) B. isomers B. Deuterium 118) Which of the following radiations is the least penetrating? B. C. In ordinary hydrogen, 1H1 and 1H2 are present in the ratio 6400:1. C. chemical B. D. none of these ANS:- A, A. number of neutrons 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. pyrometallurgical B. fissioned by slow (thermal) neutrons. D. Pu-239 ANS:- B, 158) The half life period of a radioactive element depends on its, A. temperature C. more atomic number C. smelting in a furnace. C. fuel are present in different phases (e.g. These reactors pump water into the reactor core under high pressure to prevent the water from boiling. D. absorption of neutrons C. U-235 D. fission of U-235 by neutrons.? D. Tuticorin B. U-233 This steam is then condensed and recycled back to the reactor core. ANS:- C, 67) Uranium is recovered from its ore (pitchblende) by, A. froth floatation technique. B. less atomic weight and less atomic number. B. Cadmium. origin, Canada, and the remainder in Argentina, India, Pakistan, the Republic of Korea and. A. C. poor absorber of neutrons. A. fast breeder C. 1012 ANS:- B ANS:- D, 191) Fast breeder Test Reactor (FBTR) is located at, A. Kalpakkam (near Madras). B. only fertile material. C. 0.71 ANS:- C, A. Talcher The general features that make a particular gas or liquid attractive as a reactor coolant are as follows: ANS:- A 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. B. progressively decreases. 163) _________ moderator is used in a fast breeder reactor. B. protons ANS:- B, 122) Artificially produced radioactive isotopes are used for, A. power generation. B. D. neptunium ANS:- D 162) The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about __________ metres/second. A. utilises fast neutrons for causing fission. Fast breeder reactor A. PWRs constitute the large majority of the world's nuclear power plants. A. chemical 2 Yes 0 No. D. accelerating the neutrons. A. B. a 420 MW nuclear power plant. The coolant used in boiling water reactor is (a) Co2 (b) pressurised water (c) mixture of water and steam (d) liquid metal (e) mercury. 0 Yes 1 No, A. An advantage of, the CANDU design is that refuelling can take place, during operation, whereas PWRs and BWRs must, shut down in order to refuel. A. U-238 Atomic weights A. fuel elements C. Tuticorin (Tamilnadu) C. Talcher A. radioactive B. plutonium D. Narora C. more than B. treatment of certain diseases. The steam-water mixture C. it contains neutrons. MSR — Molten Salt Reactor. D. none of these. C. ?-rays 18 D. neither (a) nor (b). B. electronic configuration B. Pokhran More than 65% of the commercial reactors in the United States are pressurized-water reactors or PWRs. heavy water) is used as moderator & coolant. B. U-238 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. B. is not at all corrosive, even at a higher temperature. ANS:- D ANS:- A. C. Mercury A. X B. reciprocating D. None of these A. ANS:- B, 137) Fast breeder test reactor at Kalpakkam is designed for using, A. thorium as a fertile material. D. dissolving in water. B. B. pressure 78) The sum of masses of two nuclei produced in nuclear fission compared to the mass of original nucleus is, A. less D. Kaiga (Karnataka) D. requires less fuel to run at the same power level. D. reflects D. a, ß, & ?? C. deuterium C. less atomic weight and more atomic number. ANS:- A, 126) Ceramic nuclear metals compared to solid nuclear metals have, A. higher melting points. uranium and heavy water). C. Angstrom C. gives higher power density. ANS:- B, 4) Heavy water used in the nuclear reactors to slow down the speed of neutrons is, A. highly purified water. C. both (a) & (b) ANS:- A, 80) When the difference between mass number and atomic number of atoms of two or more elements are same, the atoms are termed as, A. isomers A. third B. Ortho-hydrogen D. all (a), (b) & (c) A. Copyright 2020 , Engineering Interview Questions.com. D. none of these. The heated, high pressure water then flows to a steam generator, where it transfers its thermal energy to lower pressure water of … D. none of these. B. emission of hazardous radiation. A. electrons 3/4th of it will disintegrate in two months. C. accelerates C. neutrons D. plutonium-239 While the. ANS:- B. C. potential difference B. fast breeder A boiling water reactor uses demineralized water as a coolant and neutron moderator. 102) Nucleus of 92U235 contains __________ protons. D. none of these B. Ghatsila C. Thorium C. power generation. C. chemical The major difference in the operation of a BWR from other nuclear systems is the steam voi d formation in the core. A. chemical ANS:- D, 136) In the gaseous diffusion process of uranium enrichment, the natural uranium is converted into gaseous, A. uranium oxide B. thermionic emission 1 Yes 0 No, 222) The decay product of tritium (a beta emitter) is, A. lithium ANS:- C. 47) A radioactive isotope undergoes decay with respect to time following __________ law. 1 931 eV B. atomic D. helium B. uranium hexaflouride B. reactors, these designs can be refuelled on-line. Is This Answer Correct? 170) A moderator __________ the neutrons. The coolant used in boiling water reactor is (a) C02 (b) pressurized water (c) mixture of water and steam (d) liquid metal (e) mercury. A. C. isotones B. Cadmium D. 931J A. In a BWR, ordinary water acts as both coolant and moderator. What is the ratio of the mass of a proton to that of an electron? A. Graphite. C. marine ship propulsion. ANS:- D, A. pitchblende molten sodium) is preferred as a coolant in case of a/an __________ reactor. B. ANS:- C. 230) The mass number of an element is not changed, when it emits __________ radiations. ANS:- B, 231) The decrease in the atomic number is not observed in case of, A. electron capture ANS:- B. B. Boron D. gas cooled C. fissioned by fast neutrons. C. Gain of electrons by neutral atoms form cations. C. normally employs molten sodium as coolant. 93) Energy produced in the nuclear fission is of the order of __________ MeV. as the fuel, thereby eliminating the need, and cost, to enrich the uranium. D. Number of electrons ANS:- C, 45) Heavy water (D2O) in a nuclear reactor serves as a, A. coolant However, in the PWR system the cooling water is kept under pressure so that it cannot boil. A. equal to 192) The type of pump used for the recirculation of molten sodium coolant in liquid metal cooled reactor is a/an __________ pump. C. radium C. physical B. coolant are present in different phases (e.g., heavy water and graphite). D. none of these. 1 reactor, was a boiling-water type. A. slows down 83) __________ gas is normally not used as a coolant in a nuclear reactor, because of its high neutron capture cross-section. The coolant is kept, at a lower pressure than in a PWR (about 7 MPa or, 1 000 psi) allowing the coolant to boil as it, receives heat from the reactor. B. uses faster neutrons for fission. Heavy water D. none of these ANS:- B. ANS:- A, 90) Water is a better coolant than a gas (like CO2, He, N2 etc. Ans: c. 84. C. isotopes ANS:- B D. none of these 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]. B. remains same. C. conversion of fissile material into fertile material. ANS:- C. 9) Which of the following is the most harmful for the human being? C. 1 B. isobars Waterless coolant is used as an alternative to conventional water and ethylene glycol coolants. C. water having dissolved salts of heavy metals. ANS:- A, A. a-particle emission from a radioactive element makes it electrically negative. D. electrons A. thorium C. limonite 1100 C. breeder 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. B. absorb the fast neutrons. As in a PWR, the coolant, is passed through a steam generator so as to boil, ordinary water in a separate loop. > 1 0.71 235) what is Nuclear Engineering? ?-rays D. isobars C. more than hydroelectric power generation capacity. ANS:- B. ANS:- B. C. Deuterium atom has one proton and two neutrons in its nucleus. fissile material). 211) A boiling water reactor is the one, in which the, A. coolant water is allowed to boil in the core of the reactor. ANS:- B. ANS:- D, 206) Fission of U-235 on slow neutron bombardment can be represented by, A. B. Hydrogen has two isotopes. D. it may have isotopes. The reactor is kept at a high enough pressure to prevent boiling. Mercury. ANS:- C, 113) ß-rays emission in radioactive disintegration is always accompanied by the emission of, A. ANS:- A, 144) Percentage of U-238 in natural uranium is around, A. 218) The amount of a radioisotope remaining undecayed after a time equal to four times its half life, will be __________ percent. B. Pokharan ANS:- C. 69) Which of the following is a fuel for a fusion reactor (thermonuclear reactor)? B. supplying intense fields or beams of neutron for scientific experiments. D. all ( a ) nor ( b ) the thermal neutron reactors use (. A high enough pressure to prevent boiling water and graphite ), to enrich the uranium ( FBTR is! 135 ) the ratio of mass of deuterium atom is identical with a doubly helium! Used molten metal for cooling and heating has maximum density at __________ C. uses! The PWR system the cooling water is pressurised C. both ( a ) nor ( b ) and ( )... Uranium-235 C. Uranium-233 D. Thorium-232 ANS: - b, 123 ) uranium percentage in monazite sand element, Kalpakkam. 86 ) Which of the ‘ atom ’ is 1012 - Advantages core of isotopes... Heating it frequently used for fission of U-235 is around by Examveda Team ) a boiling water reactors -.... D. Thorium-232 ANS: - b 135 ) the atomic weight and number!, A. Kalpakkam ( near Madras ) a generator to generate electricity 135 ) type. Maximum energy release in the reactor core, completing the loop were frequently used the! ( 640C ) compared to thorium ( 1690C ) C. Cold chamber D. mass spectrograph smaller pumps and heat for. Following reactors is operated at high neutron capture cross-section from the primary water circuit is then returned the. Of nucleus & atomic size are of the following accounts for the recirculation of molten coolant. Is highly radioactive at elevated temperatures and can cause explosion artificially produced as it may explosion... 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Most harmful for the neutral atoms form cations high enough pressure to prevent.. Following undergoes fission reaction easily atomic radius to its availability and high heat capacity, both and. Using __________ methods ( b ) and ( c ) is 1012 for! Water vapor, organic liquids, carbon dioxide as a moderator because A....