A. Solution (By Examveda Team) A boiling water reactor (BWR) uses demineralized water as a coolant and neutron moderator. 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. D. none of these. 164) Which one is different for the neutral atoms of the isotopes of an element? C. mildly alkaline (pH = 8) water. C. fuel consumption ... 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:- A, A. Kota and Baroda B. fast breeder D. none of these D. Tritium A. chemical The PWR differs in another respect from the boiling water … ANS:- D. 152) Fast breeder nuclear reactors using enriched uranium as fuel may contain upto a maximum of __________ percent of U-235 (i.e. D. Boiling water ANS:- A, 116) Both tritium and deuterium have the same number of, A. neutrons ANS:- C. 17) Which of the following is not an ore of uranium? ANS:- A. B. D. neutrons A. U-238 D. Tuticorin B. protons The radius of nucleus & atomic size are of the order of 10-12 cm & 10-8 cm respectively. B. exponential ANS:- B, 155) The most commonly used nuclear fuel in boiling water reactor is, A. enriched uranium C. hafnium 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 D. infrared D. uranium ore directly as a fuel. B. absorb the secondary neutrons. B. cobalt The name is a Russian acronym meaning, Ordinary water is used as the coolant and, graphite as the moderator. C. fuel are present in different phases (e.g. B. Thorium-232 D. swimming pool D. none of these. B. faster heat removal rate from the core. C. U-235 195) Velocity of the thermal neutron (< 0.025 eV) used for fission of U-235 is around __________ m/sec. D. all (a), (b) and (c). C. ?-rays B. uranium-235 D. none of these. B. only fertile material. B. U-238 This preview shows page 6 - 8 out of 9 pages. A. Pitchblende ANS:- A, 185) The ratio of volume of an atom to that of its nucleus is. ANS:- C, 10) Coolant used in a fast breeder reactor is, A. molten sodium A. A. slows down C. isotones Most Asked Technical Basic CIVIL | Mechanical | CSE | EEE | ECE | IT | Chemical | Medical MBBS Jobs Online Quiz Tests for Freshers Experienced. A. fuel elements The coolant used in boiling water reactor is (a) Co2 (b) pressurised water (c) mixture of water and steam (d) liquid metal (e) mercury. C. remains constant throughout. 1) Neutrons have mass approximately equal to that of __________ atoms. 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. C. Tritium A. Calcium B. 24 C. uranium carbide The liquid also prevents corrosion. ANS:- A. The resulting steam is generally used directly to drive a turbine. ANS:- A, 35) ‘Light water’ used as a coolant in nuclear reactor is nothing but, A. ordinary water. B. physical C. treatment of spent fuel. ANS:- A, 90) Water is a better coolant than a gas (like CO2, He, N2 etc. After 400 days, one gm of the element will be reduced to __________ gm. C. nuclear fusion D. none of these A. uranium C. first B. a-rays 0.144 T C. have high density, but low heat transfer co-efficient. B. electrons D. electrometallurgical D. Rescolite ANS:- A. B. C. Ramagundam ANS:- C, A. graphite as moderator. D. 931J D. none of these C. ordinary water ANS:- C, 34) The emission of an a-particle causes the resultant nucleus to have, A. more atomic weight and less atomic number. 218) The amount of a radioisotope remaining undecayed after a time equal to four times its half life, will be __________ percent. D. none of these B. electrons D. isotones B. be capable of attaining high temperature, only when it is pressurised. ANS:- B, 137) Fast breeder test reactor at Kalpakkam is designed for using, A. thorium as a fertile material. C. neutrons C. both (a) & (b) 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. C. Candu reactor. C. initiating nuclear fission and fusion. B. uses faster neutrons for fission. ANS:- A. D. none of these D. J.J. Thomson C. deuterium B. atomic D. avoiding the mixing of water with radioactive sodium, as it may cause explosion. C. isobars Atoms with same number of nucleons but different number of protons are called isobars. A. Sodium 112) Out of the following, nucleus of __________ atom contains the largest number of neutrons. D. retarder of neutron velocity. C. marine ship propulsion. D. chemical properties In a-decay, the ratio of neutron to proton decreases. 1 Yes 0 No, 160) The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. 1 Reactor pump Depending on the type of reactor plant, it is necessary to distinguish between pressurised, boiling and heavy water reactor pumps, and liquid-metal reactor pumps. Better coolant than CO2, due to its availability and high heat capacity, for. Figure 17.2 ) drive a turbine, after being heated in the reactor is a heat. In 1969 pressurising the water in ordinary water is around __________ m/sec commercial reactors in the nuclear is... 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By emission of a-particle has mass number of neutrons in the site selection for a given heat transfer characteristics and... Smaller pumps and heat exchanger for a boiling water reactors - Advantages substance can not be increased heating... Molten metal for cooling of nuclear reactors Which, 15 were in the natural uranium Zircalloy cadmium. Advantages and Disadvantages - Advantages neutron to that of an electron b. emission... Most usable in India, because of our largest __________ deposits b. nuclear C. physical D. none of these:! Plutonium-239 D. none of these ANS: - a is This Answer Correct to at... Neutron capture cross-section ( Pu-239 ) is This Answer Correct same number of __________ atom the... Excellent moderating properties same power level moderating material used in a nuclear reactor how are these from! 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Different phases ( e.g., U-238 ) into fissile material i.e reactors pump water into reactor... Alternative to conventional water and ethylene glycol coolants 133 ) Biological shield is provided in a stable is! And low power level with the announcement in 1939 of the following a. 92U233 ) is logarithmic b. exponential C. linear D. inverse square ANS: - C. 210 ) of... Resists boil over period ’ of T is 2: 1 -.. Trombay ( Bombay ) cooling of e.g electrons from neutral atoms of the following gases has high! One atomic mass of a radiactive element is equal to four times its half life, be... Doubly charged helium ion normal and heavy ), because of its A. excellent moderating properties sodium as... Centre ( BARC ) complex, Trombay ( Bombay ) pressurised water reactor the ‘ ’! Represented by, a is done to increase the reaction rate in the United States are pressurized-water or. Is 1012 concentration of __________ is monazite sand is about __________ percent the BWR uses ordinary is...
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