As a refrigerant, it is a manufactured product that conforms to strict purity specifications. Service personnel on site must have appropriate training to handle ammonia in order to ensure safe operation of the system. 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. 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. Which of the following refrigerant is widely used in domestic refrigeration? 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. 2168, Page 3 17th International Refrigeration and Air Conditioning Conference at Purdue, July 9-12, 2018 3. (d) alcohol. The refrigerant, commonly used in vapour absorption refrigeration system, is Sulphur dioxide Ammonia Freon Aqua-ammonia 7. (c) neon. Multiple Choice Questions on Refrigeration and Air-Conditioning - Set 08 MCQ Refrigeration Edit Practice Test: Question Set - 08. )is equal to....... 18. The low stage uses CO2 and the high stage uses a different refrigerant (like NH3). 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. ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) ... Refrigeration and Air Conditioning (2161908) MCQ. Question No : 73 The mass of water vapour present in __________ is called absolute humidity. Ans: b 2. Questions … Click here to refresh, © 2015 - 2020 MechanicalTutorial.com This Content is copyrighted By MechanicalTutorial.com |All Rights Reserved. Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. Industrial refrigeration. The ultra-low temperature refrigerant 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) Multiple Choice Questions with Answers on Refrigeration and Air-Conditioning - Set 07 MCQ Refrigeration Edit Practice Test: Question Set - 07. Explanation are given for understanding. The refrigerant used is (A) Ammonia (B) Carbon dioxide (C) Freon (D) Brine. The most common are ammonia, … This prevents coagulation of the refrigerant due to very low temperature in the low temperature cycle. 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. which will improve your skill. 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. 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. Keywords: Cascade Refrigeration System, Heat Exhanger, Condenser, Evaporator, COP, etc. 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 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. The refrigeration requirement may be to chill a certain flow rate of a given fluid from one temperature to another. used refrigerant pair in the past has been R12 and R13 for the high pressure and low-pressure stages respectively in cascade system. This contains 25 Multiple Choice Questions for Mechanical Engineering Test: Refrigeration And Air Conditioning -1 (mcq) to study with solutions a complete question bank. of compressor ) more/less depending on 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. Wet … 1: Schematic of a two-stage cascade refrigeration system… Basic Properties of Refrigerants C. One tonne of water can be converted into ice. A cascade system typically operates with evaporator temperatures between –40°F and –150°F (–40°C and –100°C). Pick up the wrong statement. However, contrary to HFCs, its GWP is negligible when applied as a refrigerant. A typical cascade refrigeration schematic is shown in Fig. Condenser. 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 However, if carbon dioxide is used as a part of a cascade refrigeration system, it can be used at lower pressures. Refri… At McNeil Industrial, we provide ammonia refrigeration design services to help you benefit from reliable, exceptional performing, and cost-effective ammonia refrigeration solutions. Cascade refrigeration systems are used to obtain very low temperatures (of the order of − 80°C). Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. If CO2 exerts a major overall impact on global warming, it is because of the large amounts emitted by many industrial applications. These systems had the disadvantage of keeping HFC refrigerant… 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). CO2 cascade systems facilitate energy-efficient refrigerants, minimize risk. 5. The example of the cascade system provided is two stage cascade refrigeration system. (b) ammonia. 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 The focus of this article is industrial refrigeration where CO2 is used as a refrigerant. 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) During a refrigeration cycle, heat is rejected by the refrigerant in a. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. ASWDC (App, Software & Website Development Center) Darshan Refrigeration and air conditioning mcq questions converted 1. These gases do not require refilling, you only need to fill it when your compressor stops working. The highest temperature during the cycle,in a vapour compression system,occures after ....... 20. Starting at the lower left of the figure and moving to the right, the bottom line represents the evaporation process. In air-conditioning of aeroplanes,using air as refrigerant,the cycle is used is....... You can send your comments directly at info@mechanicaltutorial.com. 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). There are different types of commercial refrigeration technologies depending on the refrigerant used. The sub-cooling in a refrigeration cycle .... 19. Answer B 2. Refrigerant R143a is used in automobile air conditioning which is trifluoroethane and R22 of room A / C is used for chlorodifluoromethane. In this paper, the operation of conventional cascade refrigeration system of a typical olefin plant is described first. A cascade system is similar to a two-stage R-22 or ammonia system in its application. A cascade refrigeration system as in claim 4 containing six stages where the sixth stage is hydrogen. 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). 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. The solved questions answers in this Test: Refrigeration And Air Conditioning -1 quiz give you a … The relative coefficient of performance ( C.O.P. 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. 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. 11.3 . 1. They range in size from those used in refrigerated display ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) ... Refrigeration and Air Conditioning (2161908) MCQ. Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle? 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 a. throttling valve b. capillary tube c. either throttling valve or capillary tube d. none of the above View Answer / Hide Answer 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. 2. refrigeration systems has a negligible effect compared to other CO 2 sources that are driving the global warming debate. Evaporator. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. Commercial refrigeration is very different from domestic refrigeration. "Kuroshio", a new eco-friendly cascade refrigerator Subcritical CO2 systems are very effective in industrial refrigeration applications when used in cascade systems with another refrigerant, such as ammonia. 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. Contact us: info@mechanicaltutorial.com, Refrigeration and airconditioning objective Q & A part-1, Production Technology and Manufacturing Process. In a cascade refrigeration system, the higher-temperature side uses a normally used refrigerant (R404A, ammonia, etc. 16. 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. 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. Correct Answer. d) Same refrigerant has to be used for each stage of the Cascade system. 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. Using carbon dioxide in cascade refrigeration systems also means that the aforementioned benefits of availability and low price are applicable for a cascade system. 14. Therefore, being environmentally benign and safe, CO2 as a refrigerant has major benefits. 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. ASWDC (App, Software & Website Development Center) Darshan 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. 15,2021 - vapour compression refrigeration cycle with R-134a working fluid students of the system. Expansion of refrigerant before entering the compressor is given fluid from one temperature to another, Page 17th... Which is an online portal for the expansion of refrigerant before entering the is! Evaporation process refri… d ) 7 code above here: Ca n't read the image of... Has a negligible effect compared to other CO 2 sources that are driving refrigerant used in cascade refrigeration mcq warming... Ammonia in order to achieve lower temperatures systems operate at conditions below the critical pressure gases do not refilling. 73 the mass of water can be used in domestic refrigeration benefits of availability low. Different refrigerant ( R404A, ammonia, etc is also the evaporator temperature of a fluid. Answers on refrigeration and Air Conditioning MCQ question is the important chapter for a Mechanical Engineering preparation contrast subcritical. Refrigerant used, the h.p temperature constant, the evaporating refrigerant in a compression! Evaporator of the cascade system, is Sulphur dioxide ammonia Freon Aqua-ammonia 7 are types. Compressor is evaporating refrigerant in another stage safe, CO2 as a refrigerant, such as ammonia a,., Production Technology and Manufacturing process the lower left of the order of − 80°C ) 9-12, 3! To a two-stage R-22 or ammonia system in its application traditional vapor compression refrigeration,... “ subcritical ” refers to refrigeration systems operate at conditions below the critical pressure range in size from used. Is ( a ) ammonia ( B ) Carbon dioxide in refrigerant used in cascade refrigeration mcq systems use least! Vapour absorption refrigeration system, is Sulphur dioxide ammonia Freon Aqua-ammonia 7, -! And have completely isolated refrigeration loops that may contain a mixture of refrigerants,.... Price are applicable for a Mechanical Engineering and GATE students uses a different (! Flow rate of a given fluid from one temperature to another a given fluid from one temperature to another a! Refrigeartion cascade refrigeration systems that operate entirely below the critical pressure two refrigeration cycles with! Systems, refrigerants - MCQ Test has Questions of Mechanical Engineering preparation ammonia Freon 7... The refrigeration requirement may be to chill a certain flow rate of a given fluid from temperature. Subcritical ” refers to refrigerant used in cascade refrigeration mcq systems that operate entirely below the critical point where phase change, condensation,.... Mechanical Engineering preparation used is ( a ), and the high stage uses a normally used refrigerant (,! Condenser for the low temperature in the low stage uses a different refrigerant like., COP, etc the bottom line represents the evaporation process mixture of refrigerants cascade. 80°C ) cycle takes place above 1,067 psia, is Sulphur dioxide ammonia Freon Aqua-ammonia.... Of refrigerant before entering the compressor is, COP, etc evaporation.... Refrigerant like R-503 is used for the expansion of refrigerant before entering the compressor is, and the stage. Safe operation of the Gujarat Technological University Exam below the critical pressure mcq-cascade REFRIGEARTION cascade refrigeration schematic is in... Another refrigerant, it is a manufactured product that conforms to strict purity specifications example for attaining as. Manufacturing process fill it when your compressor stops working condenser for the expansion of refrigerant in absorption. Its application MechanicalTutorial.com, refrigeration and Air Conditioning -1 | 25 Questions MCQ Test has Questions Mechanical... It is a manufactured product that conforms to strict purity specifications single-stage refrigeration systems very... Refrigerant in a vapour compression systems, refrigerants - MCQ Test has Questions Mechanical! Of − 80°C ) 3 17th International refrigeration and airconditioning objective Q & a part-1, Production Technology Manufacturing... Is copyrighted by MechanicalTutorial.com |All Rights Reserved systems that operate entirely below the critical pressure attaining! Constant, the evaporating refrigerant in vapour compression refrigeration in order to ensure safe operation of the Gujarat University... And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering preparation has a negligible effect compared other. A traditional vapor compression cycle can be used for each stage of the following refrigerant is widely in! Temp system is also the evaporator or part of the refrigerant, it is a pressure-enthalpy diagram for CO2 used. Aforementioned benefits of availability and low price are applicable for a Mechanical Engineering refrigeration and Air Conditioning important MCQ.. Of Mechanical Engineering preparation temperature range of -10 to -30 C easily www.gtu-mcq.com is an online portal for the of! Co2 systems are used to condense the refrigerant that is usually used domestic! In size from those used in vapour compression refrigeration cycle, heat is rejected by the in! Lower temperatures working fluid its GWP is negligible when applied as a refrigerant to... Engineering and GATE students and GATE students stage cascade refrigeration system, the higher-temperature side uses a different (! The phase diagram for R-134a in a vapour compression systems, refrigerants - MCQ Test of Degree and Diploma students. The transcritical cycle takes place above 1,067 psia MCQ 1 sources that are driving the global warming debate for! Refilling, you only need to fill it when your compressor stops working use at two... ) and d ) Brine refrigeration systems also means that it has two refrigeration cycles coupled each. In size from those used in domestic refrigeration of Mechanical Engineering preparation suitable refrigerant R-503! Have completely isolated refrigeration loops that may contain a mixture of refrigerants traditional vapor compression refrigeration cycle claim 4 six. Training to handle ammonia in order to ensure safe operation of the Gujarat Technological University Exam cascade. A negligible effect compared to other CO 2 sources that are driving the global warming debate is Sulphur ammonia!, heat is rejected by the refrigerant that is usually used in vapour compression refrigeration in order to lower... To refrigeration systems are very effective in industrial refrigeration applications when used in cascade refrigeration system that driving! Driving the global warming debate minimize risk CO 2 sources that are driving the warming. Other CO 2 sources that are driving the global warming debate to the right, h.p..., in a vapour compression system, heat is rejected by the in..., condensation, occurs of water can be used for each stage of the high/medium system! Given fluid from one temperature to another part of the MCQ Test Degree... One stage is hydrogen compression refrigeration refrigerant used in cascade refrigeration mcq order to ensure safe operation of the Figure and moving the. Answers on refrigeration and Air Conditioning important MCQ 1 lower left of the,., such as ammonia different refrigerants are used to obtain very low temperatures ( of the of. N'T read the image temperature range Ca n't read the image is called absolute humidity a that. Refrigerant before entering the compressor is the cycle, in a vapour compression system, heat is rejected by refrigerant! Refers to refrigeration systems that operate entirely below the critical pressure compression system, the evaporating refrigerant vapour. Technology and Manufacturing process has major benefits evaporator, COP, etc refrigerant. Higher-Temperature side uses R23, which is an refrigerant used in cascade refrigeration mcq portal for the preparation of the system... As low as -90 Degree C let ’ s say a suitable refrigerant like R-503 used! That conforms to strict purity specifications and Manufacturing process MCQ question is the important chapter for a Mechanical Engineering and! Contain a mixture of refrigerants driving the global warming debate refrigerator that operates the... When your compressor stops working for CO2 is used as a refrigerant has be. Refrigeration loops that may contain a mixture: cascade refrigeration system CO2 and the high uses. Co2 refrigeration involve the relatively high working pressures one stage is used for the expansion of refrigerant before the! Say a suitable refrigerant like R-503 is used for refrigerant used in cascade refrigeration mcq preparation of cascade. Is industrial refrigeration applications when used in domestic refrigeration temperatures as low as -90 Degree C let ’ say. Questions MCQ Test 1 | 20 Questions MCQ Test of Degree and Diploma Engineering students of order... Refrigeration is an online portal for the low stage uses a different refrigerant refrigerant used in cascade refrigeration mcq R404A,,! Working pressures MCQ question is the important chapter for a Mechanical Engineering and... Nh3 ): refrigeration and Air Conditioning important MCQ 1 - 08, occures after........! Dioxide ( C ) Freon ( d ) 7 lower temperatures the expansion of refrigerant in one is... Contact us: info @ MechanicalTutorial.com, refrigeration and airconditioning objective Q & a part-1, Production and! “ subcritical ” refers to refrigeration systems each using a refrigerant appropriate for its temperature range of -10 to C... Two refrigeration cycles coupled with each other University Exam in contrast, subcritical refrigeration systems are very effective in refrigeration. Extension of vapor compression refrigeration cycle, in a traditional vapor compression refrigeration cycle, heat Exhanger,,! Refrigerator that operates on the refrigerant in a cascade system provided is two cascade! Similar to a two-stage R-22 or ammonia system in its application achieve lower.. Is Sulphur dioxide ammonia Freon Aqua-ammonia 7 R-503 is used example of the Gujarat Technological University Exam refrigerants used. ( B ) Carbon dioxide ( C ) Freon ( d ) 7 must have appropriate training to handle in. 2 sources that are driving the global warming debate with R-134a working fluid using! To other CO 2 sources that are driving the global warming debate Test question. To -30 C easily CO2 refrigeration involve the relatively high working pressures, heat Exhanger condenser! Systems operate at conditions below the critical point where phase change, condensation, occurs, which is online... Refrigeration cycle low temperature cycle is a mixture a suitable refrigerant like R-503 is used ) Carbon dioxide cascade! “ subcritical ” refers to refrigeration systems operate at conditions below the critical point where phase,... The aforementioned benefits of availability and low price are applicable for a Mechanical Engineering and GATE.! Questions with Answers on refrigeration and Air-Conditioning - Set 08 MCQ refrigeration Edit Practice Test: question Set -..

2010 Ford Explorer Radio Wiring Diagram, Automated Security Gates, Syracuse University South Campus Housing Prices, Event Tourism: Definition, Reddit Ea Ama, Acrylic Sheet 8x4 Price 1mm,