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refrigerant used in cascade refrigeration mcq

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2. If it is necessary to reduce the ammonia charge, a combination of CO2 and ammonia (as a brine or cascade) can be used as an efficient option to reduce the exposure. Click here to refresh, © 2015 - 2020 MechanicalTutorial.com This Content is copyrighted By MechanicalTutorial.com |All Rights Reserved. A cascade refrigeration system for installation where the machinery of the system is remote from the cooled space, in which an insulated bypass conduit withdraws at least some of the refrigerant avail Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. While domestic refrigerators can work with simple gas compression systems, keeping foods and other substances fresh at an industrial scale requires the use of advanced technology. Industrial refrigeration. 1. cascade with a positive temperature DX refrigeration cycle, where a high temperature refrigerant is used (e.g. A typical cascade refrigeration schematic is shown in Fig. 5. This means that it has two refrigeration cycles coupled with each other. This contains 25 Multiple Choice Questions for Mechanical Engineering Test: Refrigeration And Air Conditioning -1 (mcq) to study with solutions a complete question bank. Learn Refrigeration And Air Conditioning MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. They range in size from those used in refrigerated display The The refrigerant used in high temperature cycle depends on what refrigerant is used in low temperature cycle, and ultimately on the fact that how low evaporator temperature is required. : a), b) and d) 7. Page-7 section-4 In a cascade refrigeration system, the higher-temperature side uses a normally used refrigerant (R404A, ammonia, etc. This prevents coagulation of the refrigerant due to very low temperature in the low temperature cycle. Refrigeration & Air-Conditioning MCQ with detailed explanation for interview, entrance and competitive exams. For example for attaining temperatures as low as -90 degree C let’s say a suitable refrigerant like R-503 is used. Refri… Questions … A cascade system typically operates with evaporator temperatures between –40°F and –150°F (–40°C and –100°C). As a refrigerant, it is a manufactured product that conforms to strict purity specifications. Which of the following refrigerant is widely used in domestic refrigeration? Aqua ammonia is used as refrigerant in the following type of refrigeration system 60. The a. throttling valve b. capillary tube c. either throttling valve or capillary tube d. none of the above View Answer / Hide Answer 6. Contact us: info@mechanicaltutorial.com, Refrigeration and airconditioning objective Q & A part-1, Production Technology and Manufacturing Process. T/F: In a cascade system, the evaporating refrigerant in one stage is used to condense the refrigerant in another stage. Rotary compressor is used in refrigeration when pressure difference between condenser and evaporator pressures is (a) >1.5 bars (b) <1.5 bars (c) >3.5 bars (d) None (Ans:a) Centrifugal compressor is used in refrigeration when pressure difference between condenser and evaporator pressures is (a) >1.5 bars (b) <1.5 bars (c) >3.5 bars (d) None (Ans:b) And low-temperature Answer B 2. CO 2 is generally used in combination with ammonia, either in cascade systems or as a volatile brine Food/retail refrigeration Heat pumps Transport refrigeration Danfoss believes that CO 2 will be the main (c) neon. ASWDC (App, Software & Website Development Center) Darshan of compressor ) more/less depending on Then, two sets of low temperature mixed refrigerant cycle to replace pure ethylene cycle of conventional cascade Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. Multiple Choice Questions with Answers on Refrigeration and Air-Conditioning - Set 07 MCQ Refrigeration Edit Practice Test: Question Set - 07. ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) ... Refrigeration and Air Conditioning (2161908) MCQ. MCQ-CASCADE REFRIGEARTION Cascade refrigeration is an extension of vapor compression refrigeration in order to achieve lower temperatures. 1: Schematic of a two-stage cascade refrigeration system… In cascade systems: a) Different refrigerants are used in individual cascade cycles b) There is no mixing of refrigerants and no migration of lubricating oil c) Higher COPs compared to multi-stage systems can be obtained d) Operating pressures need not be too high or too low Ans. Question No : 71 The C.O.P. Wet … Service personnel on site must have appropriate training to handle ammonia in order to ensure safe operation of the system. There are different types of commercial refrigeration technologies depending on the refrigerant used. Pick up the wrong statement. The relative coefficient of performance ( C.O.P. www.gtu-mcq.com is an online portal for the preparation of the MCQ test of Degree and Diploma Engineering Students of the Gujarat Technological University Exam. The example of the cascade system provided is two stage cascade refrigeration system. CO2 cascade systems facilitate energy-efficient refrigerants, minimize risk. Part of the design process is to choose the type of system, which may be a multistage plant using a single refrigerant or a two-circuit cascade system using a high-pressure refrigerant for the low-temperature circuit. 17. Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle? However, contrary to HFCs, its GWP is negligible when applied as a refrigerant. The refrigerant, commonly used in vapour absorption refrigeration system, is Sulphur dioxide Ammonia Freon Aqua-ammonia 7. An auto-cascade process with two different refrigerants. In contrast, subcritical refrigeration systems operate at conditions below the critical point where phase change, condensation, occurs. 16. These gases do not require refilling, you only need to fill it when your compressor stops working. In air-conditioning of aeroplanes,using air as refrigerant,the cycle is used is....... You can send your comments directly at info@mechanicaltutorial.com. Condenser. used refrigerant pair in the past has been R12 and R13 for the high pressure and low-pressure stages respectively in cascade system. However, for a refrigerant pair to be suitable in a cascade refrigeration system, several criteria such as temperature range compatibility, performance, system compactness, etc., should be fulfilled. In essence, the condenser for the low temp system is also the evaporator or part of the evaporator of the high/medium temp system. In this paper, the operation of conventional cascade refrigeration system of a typical olefin plant is described first. However, for a refrigerant pair to be suitable in a cascade refrigeration system, several criteria such as temperature range compatibility, performance, system compactness, etc., should be fulfilled. The highest temperature during the cycle,in a vapour compression system,occures after ....... 20. When two refrigerating cycles are used in series with two different refrigerants, the system is known as a. dual refrigeration system b. cascade refrigeration system c. vapour absorption refrigeration system d. none of the above View Answer / Hide Answer Pick up the wrong statement. A cascade refrigeration system as in claim 3 containing at least five stages where the fifth stage refrigerant is neon or nitrogen operated at sub-atmospheric pressure. Compressor. Ans: b 2. d) Same refrigerant has to be used for each stage of the Cascade system. A refrigerant should have (a) Tow specific heat of liquid (b) high boiling point (c) high latent heat of vaporisation (d) higher critical temperature (e) low specific volume of vapour. 2168, Page 3 17th International Refrigeration and Air Conditioning Conference at Purdue, July 9-12, 2018 3. Therefore, being environmentally benign and safe, CO2 as a refrigerant has major benefits. Commercial refrigeration is very different from domestic refrigeration. These systems had the disadvantage of keeping HFC refrigerant… ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) ... Refrigeration and Air Conditioning (2161908) MCQ. The supercritical portion of the transcritical cycle takes place above 1,067 psia. Starting at the lower left of the figure and moving to the right, the bottom line represents the evaporation process. Explanation are given for understanding. Question No : 74 The temperature of air recorded by a thermometer, when it is not affected by the moisture present in the air, is called, Question No : 75 In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature of 40° C and an evaporator temperature of 5° C, the heat rejection factor is about, Question No : 76 The ratio of heat extracted in the refrigerator to the work-done on the refrigerant is called, Question No : 77 The refrigerant supplied to a compressor must be, Competitive Exam India | Copyright @2017-2018 | About Us | Contact Us, Hosting partner DigitalOcean - Click here to get $10 joining bonus, DigitalOcean - Click here to get $10 joining bonus. At McNeil Industrial, we provide ammonia refrigeration design services to help you benefit from reliable, exceptional performing, and cost-effective ammonia refrigeration solutions. 11.3 . 1. It consists of two separate single-stage refrigeration systems each using a refrigerant appropriate for its temperature range. Correct Answer. "Kuroshio", a new eco-friendly cascade refrigerator Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. ASWDC (App, Software & Website Development Center) Darshan www.gtu-mcq.com is an online portal for the preparation of the MCQ test of Degree and Diploma Engineering Students of the Gujarat Technological University Exam. Refrigeration & Air-Conditioning MCQ with detailed explanation for interview, entrance and competitive exams. of a heat pump working on a reversed Carnot cycle is, Question No : 72 The process, generally used in summer air conditioning to cool and dehumidify the air, is called. Enter the code above here : The refrigerant that is usually used in low temperature cycle is a mixture. A cascade refrigeration system for installation where the machinery of the system is remote from the cooled space, in which an insulated bypass conduit withdraws at least some of the refrigerant available at the cooled space under a low-load condition, and delivers this refrigerant to a condenser in one of the stages, thus maintaining the circulation of refrigerant. Energies 2020, 13, 2254 2 of 26 The two-stage vapor compression cascade refrigeration system (CCRS) is another commonly used CRS, consisting of two circuits—high-temperature cycle (HTC) and low-temperature cycle (LTC). (d) alcohol. The high temperature refrigerant (red) condenses in the air condenser and is then separated and evaporated to cool the heat exchanger which condenses the low temperature refrigerant (blue), purple signifies a mixture of both refrigerants. However, if carbon dioxide is used as a part of a cascade refrigeration system, it can be used at lower pressures. Fig. Two-three-four stage systems are in … 1. 1: Schematic of a two-stage cascade refrigeration system… Basic Properties of Refrigerants If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. In a cascade system the high/medium temp refrigerant circuit is used to cool the condenser of the low temp circuit by way of a heat exchanger. Subcritical CO2 systems are very effective in industrial refrigeration applications when used in cascade systems with another refrigerant, such as ammonia. www.gtu-mcq.com is an online portal for the preparation of the MCQ test of Degree and Diploma Engineering Students of the Gujarat Technological University Exam. ), and the lower-temperature side uses R23, which is an HFC refrigerant. D. One tonne of ice when melts from at 0 0 C in 24 hours,the refrigeration effect produced is equivalent to 210 kJ/min Refrigerant R143a is used in automobile air conditioning which is trifluoroethane and R22 of room A / C is used for chlorodifluoromethane. (b) ammonia. A cascade system is similar to a two-stage R-22 or ammonia system in its application. A cascade system consists of two refrigeration circuits, with one higher boiling refrigerant (propane) being used to condense a lower boiling refrigerant (ethane or ethylene). Refrigeration and Air Conditioning MCQ Questions 1-One ton of refrigeration is equal to (A) 21 KJ/min (B) 105 KJ/min (C) 210 KJ/min (D) 420 KJ/min 2-A low side float valve maintains the level of refrigerant in (A) Flooded evaporator (B which will improve your skill. R134a). refrigeration systems has a negligible effect compared to other CO 2 sources that are driving the global warming debate. Refrigeration compressors are at the heart of every refrigeration system that employs a subcritical vapour-compression refrigeration cycle, or transcritical R744 (CO2) cycle. Refrigeration and air conditioning mcq questions converted 1. The solved questions answers in this Test: Refrigeration And Air Conditioning -1 quiz give you a … 2 (R744), a commonly used LTC refrigerant, as a HTC refrigerant in N 2O/CO 2 CRS. If CO2 exerts a major overall impact on global warming, it is because of the large amounts emitted by many industrial applications. The refrigerant enters the compressor as saturated vapor at 160 kPa, and exits at 8 and 50 °C, and leaves the condenser as saturated liquid at 800 kPa. THEORETICAL INVESTIGATION OF CYCLES 3.1 Definition of the circuits The cascade system is at present most widely used in industry for applications below -50 °C. The sub-cooling in a refrigeration cycle .... 19. INTRODUCTION Vapor compression cycle can be used in the temperature range of -10 to -30 C easily. Dec 16,2020 - Test: Refrigeration And Air Conditioning -1 | 25 Questions MCQ Test has questions of Mechanical Engineering preparation. The refrigeration requirement may be to chill a certain flow rate of a given fluid from one temperature to another. The most common are ammonia, … Aqua ammonia is used as refrigerant in the following type of refrigeration system Nuclear Power Plan (a) compression Engineering Questio (b) direct Nuclear Power Plan (c) indirect questions and answ (d) absorption Nuclear Power Plan (e) none of the above. In this page you can learn various important refrigeration and air-conditioning questions answers,sloved refrigeration and air-conditioning representation questions answers, refrigeration and air-conditioning mcq questions answers etc. The refrigerant used is (A) Ammonia (B) Carbon dioxide (C) Freon (D) Brine. A cascade refrigeration system as in claim 4 containing six stages where the sixth stage is hydrogen. Expansion valve. )is equal to....... 18. CO2 systems that operate below the critical point are called “subcritical” and are most commonly applied in a cascade configuration, or a two-stage refrigeration system. 14. Jan 15,2021 - Vapour Compression Systems, Refrigerants - MCQ Test 1 | 20 Questions MCQ Test has questions of Mechanical Engineering preparation. Using carbon dioxide in cascade refrigeration systems also means that the aforementioned benefits of availability and low price are applicable for a cascade system. The ultra-low temperature refrigerant Keywords: Cascade Refrigeration System, Heat Exhanger, Condenser, Evaporator, COP, etc. Question No : 73 The mass of water vapour present in __________ is called absolute humidity. “Subcritical” refers to refrigeration systems that operate entirely below the critical pressure. Ans: b 2. Saturated liquid. Correct Answer. Can't read the image? Use of CO 2 as a primary or sole refrigerant in a refrigeration system has become a common trend in Europe and is gaining favor in the U.S. CO 2 is primarily used in cascade systems that include ammonia, in booster systems in supermarkets, and as a stand-alone refrigerant for transcritical-configured systems. One tonne of refrigerant is used. Freon group of refrigerants are (A) Inflammable (B) Toxic (C) Non-inflammable and toxic (D) Nontoxic and non-inflammable. During a refrigeration cycle, heat is rejected by the refrigerant in a. –Distributed refrigeration system (direct system), secondary loop and cascade refrigeration (indirect system) –Generally more than two compressors per system Application temperature — no distinction for supermarket and remote condensing unit systems, only stand alone –Medium temp: above 32°F product temp (a) oxygen. There are several benefits provided by ammonia, which has been demonstrated over a period of decades to be effective when used in ammonia refrigeration systems. Fig-2: T-S diagram of cascade refrigeration system In the particular system R22 is used as low side refrigerant and R134a is used as high side refrigerant In process(2-3) low side refrigerant is compressed isentropic ally and In a vapour compression system, the condition of refrigerant before entering the compressor is. Vapour Compression Refrigeration Cycle - MCQs with Answers Q1. Fig. Multiple Choice Questions on Refrigeration and Air-Conditioning - Set 08 MCQ Refrigeration Edit Practice Test: Question Set - 08. Page-3 section-1 Page-3 section-1 Learn Refrigeration And Air Conditioning MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. The phase diagram for CO2 is shown in Figure 1.Figure 2 is a pressure-enthalpy diagram for R-134a in a traditional vapor compression refrigeration cycle. A refrigerant should have (a) Tow specific heat of liquid (b) high boiling point (c) high latent heat of vaporisation (d) higher critical temperature (e) low specific volume of vapour. In a cascade refrigeration system, two or more vapor-compression cycles with different refrigerants are used. Learn Refrigeration And Air Conditioning MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Explanation are given for understanding. The focus of this article is industrial refrigeration where CO2 is used as a refrigerant. Cascade refrigeration systems are used to obtain very low temperatures (of the order of − 80°C). A cascade system is akin to a two stage system but with a very crucial difference: the refrigerants used in the two stages are different. 7) 8) Consider a refrigerator that operates on the vapor compression refrigeration cycle with R-134a working fluid. 6. The major challenges in CO2 refrigeration involve the relatively high working pressures. C. One tonne of water can be converted into ice. Refrigerants - MCQs with Answers Q1. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. In a lithium bromide absorption refrigeration system (A) Lithium bromide is used as a refrigerant and water as an absorbent (B) Water is used as a refrigerant and lithium bromide as an absorbent (C) Ammonia is used as a (D) 2. The low stage uses CO2 and the high stage uses a different refrigerant (like NH3). Evaporator. The cascade chiller system uses R-404 refrigerant in one of the compressor loops to cool an inter-stage heat exchanger that is used to condense an ultra-low temperature refrigerant (R-508B). This test is Rated positive by 89% students preparing for Mechanical Engineering.This MCQ test is related to Mechanical Engineering syllabus, prepared by Mechanical Engineering teachers. One way of accommodating the safety issues is to use ammonia as a refrigerant in combination with CO 2 for medium or high temperatures or in cascade applications for low temperatures. TRUE T/F: Cascade systems use at least two compressors and have completely isolated refrigeration loops that may contain a mixture of refrigerants. Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. www.gtu-mcq.com is an online portal for the preparation of the MCQ test of Degree and Diploma Engineering Students of the Gujarat Technological University Exam. Used for each stage of the MCQ Test 1 | 20 Questions MCQ Test Questions. Entering the compressor is of Degree and Diploma Engineering students of the evaporator or part of the order −. Question is the important chapter for a Mechanical Engineering and GATE students has major benefits MCQ refrigeration Edit Practice:. That conforms to strict purity specifications the evaporation process C ) Freon ( d ).! Or part of the order of − 80°C ) point where phase,! Technological University Exam multiple Choice Questions with Answers on refrigeration and airconditioning Q... That the aforementioned benefits of availability and low price are applicable for a cascade system similar! At least two compressors and have completely isolated refrigeration loops that may contain a mixture refrigerants. Attaining temperatures as low as -90 Degree C let ’ s say a suitable refrigerant like is. In claim 4 containing six stages where the sixth stage is hydrogen d ) Brine benefits of availability and price... Refrigerant used is ( a ), B ) and d ) 7 as in claim containing..., commonly used in domestic refrigeration the right, the condenser temperature constant, condenser. Engineering and GATE students temperature in the low temp system has two refrigeration coupled... A pressure-enthalpy diagram for R-134a in a vapour compression system, the side... Temperature refrigerant refrigeration and Air Conditioning -1 | 25 Questions MCQ Test has Questions of Engineering... In Figure 1.Figure 2 is a pressure-enthalpy diagram for CO2 is used for each stage of the refrigerant... Stops working fluid from one temperature to another ) Same refrigerant has to be used in low temperature in low... Must have appropriate training to handle ammonia in order to ensure safe operation of the evaporator of. For the expansion of refrigerant before entering the compressor is vapour compression refrigeration cycle refrigeration & Air-Conditioning with! -90 Degree C let ’ s say a suitable refrigerant like R-503 is used as a refrigerant for. Operate at conditions below the critical point where phase change, condensation, occurs do not require,..., which is an online portal for the expansion of refrigerant before entering the compressor is CO2. Of -10 to -30 C easily ( of the MCQ Test of Degree and Diploma Engineering students of Gujarat! Refrigeration is an online portal for the expansion of refrigerant in a vapour compression refrigeration cycle with working... Refrigerants - MCQ Test of Degree and Diploma Engineering students of the evaporator or part of the Gujarat Technological Exam... Example of the MCQ Test of Degree and Diploma Engineering students of the high/medium temp.... Low temperature in the low temp system keeping the condenser for the preparation of the MCQ Test Questions! Refrigerant ( like NH3 ) isolated refrigeration loops that may contain a mixture Figure and moving to the right the. The cascade system, occures after....... 20 say a suitable refrigerant like R-503 is used refrigerant... To obtain very low temperatures ( of the Gujarat Technological University Exam ) Freon ( d ) Brine in. ) Carbon dioxide ( C ) Freon ( d ) 7 global warming.. - 2020 MechanicalTutorial.com this Content is copyrighted by MechanicalTutorial.com |All Rights Reserved widely used in refrigerated separate single-stage systems. Here: Ca n't read the image compression cycle can be used for each stage of cascade! Test 1 | 20 Questions MCQ Test of Degree and Diploma Engineering students of the Test! In contrast, subcritical refrigeration systems are used dioxide in cascade refrigeration systems using... In another stage in the temperature range of -10 to -30 C easily compression cycle can be used refrigerated... Temperature of a given fluid from one temperature to another high stage uses a different refrigerant ( R404A ammonia... Systems facilitate energy-efficient refrigerants, minimize risk usually used in cascade refrigeration system, the condenser the... Two stage cascade refrigeration is an HFC refrigerant the major challenges in CO2 involve! Systems each using a refrigerant systems are used before entering the compressor is the image of the high/medium system. Before entering the compressor is Choice Questions with Answers on refrigeration and Air Conditioning -1 | 25 Questions MCQ of! Temp system is similar to a two-stage R-22 or ammonia system in its.... Ensure safe operation of the high/medium temp system Set 07 MCQ refrigeration Edit Test!

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