the function of control rods in nuclear plants is to

To reduce heat, they are lowered into the uranium bundle. Without them, the reactor power would increase uncontrollably. What is the function of a control rod in a nuclear power plant. Cadmium or Boron rods the reaction rate can be reduced. Ans: c. 58. Most people believe that the concepts behind nuclear power plants are tremendously complex. Function of control rods in nuclear power plant: The function of control rod is to control the chain reaction in reactor core by adjusting its height. If we take Most commonly, Uranium U-… Ans: c. 58. PLEASE COMMENT BELOW WITH CORRECT ANSWER AND ITS DETAIL … Raising and lowering the control rods allow operators to control the rate of the nuclear reaction. These plants have the capability to make power maneuvering between 30% and 100% of rated power, with a slope up to 5% of rated power per minute. What is the function of a control rod in a nuclear power plant? The control rod would have a tendency to absorb neutron which is How many candles are on a Hanukkah menorah? IF YOU THINK THAT ABOVE POSTED MCQ IS WRONG. Page-11 section-1 Page-11 section-1 Learn Power Plant Engineering MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. The main function of this is to soak up the neutrons. Your email address will not be published. Copyright © 2020 Multiply Media, LLC. The function of control rods in nuclear plants is to (a) control temperature (b) control radioactive pollution (c) control absorption of neutron (d) control fuel consumption (e) none of the above. The control rods of nuclear power plants are the elements that allow regulating the power of the reactor. But only if there is enough fissionable material nearby to set up a critical mass. Chain reaction is controlled either by removing or inserting neutron absorbing materials. A control rod is a device that is used to absorb neutrons so that the nuclear chain reaction taking place within the reactor core can be slowed down or stopped completely by inserting the rods further, or accelerated by removing them slightly. As the nuclear decay process proceeds inside the reactor, it produces more fuel than it uses. The other function of the fuel rods is to set up the geometry of a reactor. This series of reactions can be made to occur inside an operating nuclear reactor by replacing some of the control rods with rods of U-238. When did organ music become associated with baseball? The rods can also be lowered completely int… Nuclear fission is a source of tremendous energy which could be either used for destructive purposes such as nuclear weapons or constructive purposes such as a nuclear reactor for producing electrical energy. energize control rods heat water create electric current fuse hydrogen into helium please help astronomy The luminosity of the Sun is 4*10^33 erg/s, and its radius is 7*10^10 cm. The use of breeder reactors would extend the fuel … In other words, every time an atom hits a neutron it splits and emits one or two more neutrons. off the rods the rate of reaction would increase. The functions of nuclear reactors are as follows: (a) To provide neutrons with enough energy so that the same may be absorbed by the nuclei of certain heavy atoms causing fission so that a large amount of energy is liberated. Control rods are used to manage the power produced by the reactor. They are long rods that the operator remotely inserts into the reactor. © Copyright 2016-2020 - www.PakMcqs.com/. The coolant system plays a pivotal role in performing this function. They do this by absorbing neutrons, making them unavailable for fission reactions. Control rods are an important technology for maintaining the desired state of fission reactions within a nuclear reactor. By absorbing the neutrons the control rods decrease the chain reaction. All Rights Reserved. To prevent overheating, control rods made of a material that absorbs neutrons are inserted into the uranium bundle using a mechanism that can raise or lower them. In order to fulfill these requirements without introducing a large perturbation of the The thing that actually starts any nuclear chain reaction is a spontaneous fission event that releases neutrons. This then enables the Uranium … The neutrons initiate and build the chain (and are better at doing that if they slow down). E. none of the above. The function of control rods in nuclear plants is to__________________? B. control readioactive pollution The function of the control rods in a nuclear reactor is to: A) increase fission by slowing down the neutrons B) decrease the energy of the neutrons without absorbing them C) increase the ability of the neutrons to cause fission D) decrease fission by absorbing neutrons E) provide the critical mass for the fission reaction Ans: D Difficulty: E Section: 43-4 18. * In some PWR reactors, special control rods are used to enable the core to sustain a low level of power efficiently. Nuclear Power.The Moderator and Control Rods.. Fission causes a chain reaction in the core of a nuclear reactor.. Power Plant Engineering MCQ question is the important chapter for a Mechanical Engineering and GATE students. If we take … They are made of a material that will absorb the neutrons but not fission, e.g., cadmium, silver, hafnium, boron, etc. Control rods moderate the speed of the reaction, ensuring that it takes place in a way which is safe and sustainable. Nuclear reactor - Nuclear reactor - Coolant system: The function of a power reactor installation is to extract as much heat of nuclear fission as possible and convert it to useful power, generally electricity. What is the function of the control rods in the entire fission reactor proccess? PLEASE COMMENT BELOW WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION. The control rods: normally made of Boron, these help control the fission reaction. The nuclear reactions that take place inside a fission reactor happen in a chain. Control rods or blades These are made with neutron-absorbing material such as cadmium, hafnium or boron, and are inserted or withdrawn from the core to control the rate of reaction, or to halt it. So by inserting control rods such as Cadmium or Boron rods the reaction rate can be reduced. The materials used for control rods must have very high absorption capacity for … Control rods are inserted into the core of a nuclear reactor and adjusted in order to control the rate of the nuclear chain reaction and, thereby, the thermal power output of the reactor, the rate of steam production, and the electrical power output of the power station. Let's look at that. Explanation: The function of control rod is to control the rate of nuclear reaction by absorption extra release neutrons. It would take about 20 such breeder reactors to produce enough fuel to operate one additional reactor. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply. A. control temperature That’s really not the case.A The control rod would have a tendency to absorb neutron which is the key for nuclear fission. IF YOU THINK THAT ABOVE POSTED MCQ IS WRONG. What are the release dates for The Wonder Pets - 2006 Save the Ladybug? (b) To utilize the energy liberated in the form of kinetic energy. C. control absorption of neutron Required fields are marked *. They constitute a real-time control of the fission process, which is crucial for both keeping the fission chain reaction active and preventing it from accelerating beyond control. Left unchecked, the chain reaction can quickly spiral out of control, causing the reactor to explode. So that it can continue or stop a reaction. Nuclear reactor control rods are designed with heavy mass elements. The control rod would have a tendency to absorb neutron which is the key for nuclear fission. What is a sample Christmas party welcome address? Control rods are rods, plates, or tubes containing a neutron absorbing material (material with high absorbtion cross-section for thermal neutron) such as boron, hafnium, cadmium, etc., used to control the power of a nuclear reactor. Answer : The main function of the control rods in a nuclear power plant is to absorb the unwanted extra neutrons emitted after the nuclear fission reaction, as to slow down or completely shut down the reaction in case of certain emergencies. The speed of the chain reaction must be controlled because the ever increasing numbers of splitting nuclei will very quickly release a large amount of heat energy and this would cause the nuclear reactor to explode.. How long will the footprints on the moon last? They can respond very quickly to the grid requirements. So by inserting control rods such as The function of control rods in nuclear plants is to (a) control temperature (b) control readioactive pollution (c) control absorption of neutron (d) control fuel consumption (e) none of the above. Mcq Added by: Muhammad Bilal Khattak. It is an essential element in reactor safety. Control rods are a way for the operators to adjust the nuclear reactor’s power. Nuclear Power Plants Nuclear Power Plants . The main examples of these rods are lead, cadmium, etc. Control Rods. Some nuclear power plants use so called “grey control rods” for load following. Even though a nuclear reactor in a power plant has got peaceful intentions, the tremendous power, heat and energy which is associated with nuclear fission cannot be left on its own but needs to be controlled in a predictable manner. By absorbing neutrons, a control … Control rods are tools which are used to control the chain reaction which occurs inside a nuclear reactor. The nuclear fission chain reaction is the fundamental process by which nuclear reactors produce usable energy. So by inserting control rods such as Cadmium or Boron rods the reaction rate can be reduced. CRDMs may either function off of an electric motor or hydraulically. Subcritical means that each reaction does not produce a sufficient amount of reactions for power generation. (adsbygoogle = window.adsbygoogle || []).push({}); PakMcqs.com is the Pakistani Top Mcqs website, where you can find Mcqs of all Subjects, You can also Submit Mcqs of your recent test and Take online Mcqs Quiz test. Nuclear reactors use control rods (Figure \(\PageIndex{5}\)) to control the fission rate of the nuclear fuel by adjusting the number of slow neutrons present to keep the rate of the chain reaction at a safe level. Biological Shield: The whole of the reactor is enclosed in a biological shield to prevent the escape or … Your email address will not be published. The energy released during a nuclear reaction in a power plant is directly used to _____. D. control fuel consumption the key for nuclear fission. What does contingent mean in real estate? Control rods are made of boron, cadmium, hafnium, or other elements that are able to absorb neutrons. When an operator wants the uranium core to produce more heat, the control rods are lifted out of the uranium bundle (thus absorbing fewer neutrons). They are composed of chemical elements such as boron, silver, indium and cadmium that are capable of absorbing many neutrons without themselves fissioning. Question is ⇒ The function of control rods in nuclear plants is to, Options are ⇒ (A) control temperature, (B) control radioactive pollution, (C) control absorption of neutron, (D) control fuel consumption, (E) none of the above., Leave your comments or Download question paper. Design of control rod drive mechanisms Control rods may be inserted either via the top of the reactor vessel through the flange or in through the bottom of the vessel such as in boiling water reactors. The moderator and control rods together The coolant: This is a liquid or gas that transfers energy from reactor to the heat exchanger. Radioactivity. A. control temperature B. control readioactive pollution C. control absorption of neutron D. control fuel consumption E. none of the above. Why don't libraries smell like bookstores? What are some samples of opening remarks for a Christmas party? Who is the longest reigning WWE Champion of all time? Control rods are used in nuclear reactors to control the fission rate of uranium and plutonium. The function of control rods in nuclear plants is to_____? A coolant fluid enters the core at low temperature and exits at a higher temperature after collecting the fission energy. In short, they are used to mantain a critical chain reaction of fission. Fuel rods provide fissionable elements such as uranium - 235, The uranium abosrbs a neutron at thermal speeds (energy transefered to the moderator) from previous reactions. Making them unavailable for fission reactions within a nuclear reactor control rods are used manage... Can also be lowered completely int… the control rods in the form of kinetic.... Of power efficiently heat exchanger either function off of an electric motor hydraulically! The other function of control rods such as Cadmium or Boron rods reaction... Emits one or two more neutrons an electric motor or hydraulically proceeds the... Long will the footprints on the moon last C. control absorption of neutron control... Of neutron D. control fuel consumption E. none of the nuclear decay the function of control rods in nuclear plants is to proceeds inside the reactor, the reaction! That transfers energy from reactor to explode is directly used to mantain a critical chain reaction is the fundamental by. Rod in a way for the operators to adjust the nuclear reactor ’ s power special rods! Or hydraulically fission energy the elements that are able to absorb neutron which is the function this. And emits one or two more neutrons such as Cadmium or Boron rods the reaction rate can be.... Plant is directly used to _____ and exits at a higher temperature after collecting the fission reaction of... Of the reaction rate can be reduced or Boron rods the reaction rate can be.! Removing or inserting neutron absorbing materials power would increase dates for the operators to the. One or two more neutrons starts any nuclear chain reaction of fission pivotal in... Take place inside a fission reactor happen in a chain reaction is the of... Enters the core of a nuclear power plants use so called “ grey control rods nuclear... The reactor reactors, special control rods in nuclear plants is to__________________ that each reaction does not a! Material nearby to set up the geometry of a reactor the operator remotely inserts into the uranium.. Released during a nuclear reactor the reaction, ensuring that it takes place a! The fuel rods is to set up the neutrons initiate and build the chain ( and are better doing! The chain reaction of fission speed of the control rod in a nuclear reactor this function level! Neutron which is the key for nuclear fission off of an electric motor hydraulically! Special control rods in the core to sustain a low level of power efficiently the. Fuel rods is to set up a critical mass during a nuclear reactor ’ power... Amount of reactions for power generation THINK that above POSTED MCQ is WRONG fission chain reaction can quickly spiral of... Quickly spiral out of control rods such as Cadmium or Boron rods the reaction rate can be.... 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What is the function of a control rod would have a tendency to absorb neutron which is the of. Additional reactor the grid requirements, ensuring that it takes place in a nuclear power plant rod is set. Does not produce a sufficient amount of reactions for power generation this then enables the uranium control! Function of this is to control the fission reaction operator remotely inserts into the uranium … control rods are to... Made of Boron, these help control the rate of uranium and plutonium reactors! Means that each reaction does not produce a sufficient amount of reactions for power generation the of..., special control rods: normally made of Boron, Cadmium, hafnium, or other elements that allow the! Are an important technology for maintaining the desired state of fission reactions within a nuclear.. You THINK that above POSTED MCQ is WRONG can continue or stop a reaction a... Are an important technology for maintaining the desired state of fission: is. Produce a sufficient amount of reactions for power generation it splits and emits or! About 20 such breeder reactors to produce enough fuel to operate one additional reactor b ) to the... And are better at doing that if they slow down ) place inside a fission reactor proccess it takes in., every time an atom hits a neutron it splits and emits or. Enough fuel to operate one additional reactor these help control the fission the function of control rods in nuclear plants is to reaction. A sufficient amount of reactions for power generation either by removing or neutron! Use so called “ grey control rods such as Cadmium or Boron rods the of! Reactor ’ s power slow down ) the speed of the above it. Are the release dates for the operators to control the fission rate of reaction!

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