In essence, the condenser for the low temp system is also the evaporator or part of the evaporator of the high/medium temp system. The refrigerant, commonly used in vapour absorption refrigeration system, is Sulphur dioxide Ammonia Freon Aqua-ammonia 7. A cascade refrigeration system as in claim 4 containing six stages where the sixth stage is hydrogen. 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. 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 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). The example of the cascade system provided is two stage cascade refrigeration system. In a cascade refrigeration system, two or more vapor-compression cycles with different refrigerants are used. 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) Page-7 section-4 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 This prevents coagulation of the refrigerant due to very low temperature in the low temperature cycle. 6. 7) 8) Consider a refrigerator that operates on the vapor compression refrigeration cycle with R-134a working fluid. In contrast, subcritical refrigeration systems operate at conditions below the critical point where phase change, condensation, occurs. Correct Answer. Pick up the wrong statement. Vapour Compression Refrigeration Cycle - MCQs with Answers Q1. Freon group of refrigerants are (A) Inflammable (B) Toxic (C) Non-inflammable and toxic (D) Nontoxic and non-inflammable. The most common are ammonia, … Correct Answer. Fig. Industrial refrigeration. The major challenges in CO2 refrigeration involve the relatively high working pressures. 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. 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. Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. Subcritical CO2 systems are very effective in industrial refrigeration applications when used in cascade systems with another refrigerant, such as ammonia. 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. Question No : 71 The C.O.P. The focus of this article is industrial refrigeration where CO2 is used as a refrigerant. 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 The “Subcritical” refers to refrigeration systems that operate entirely below the critical pressure. 14. 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. 5. 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. 1. This means that it has two refrigeration cycles coupled with each other. Ans: b 2. 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 refrigeration requirement may be to chill a certain flow rate of a given fluid from one temperature to another. These systems had the disadvantage of keeping HFC refrigerant… These gases do not require refilling, you only need to fill it when your compressor stops working. 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. Cascade refrigeration system R404A, ammonia, etc also the evaporator of the cycle... 2015 - 2020 MechanicalTutorial.com this Content is copyrighted by MechanicalTutorial.com |All Rights Reserved introduction vapor compression refrigeration cycle R-134a!, COP, etc commonly used in refrigerated safe operation of the Gujarat Technological University Exam however, to. Coagulation of the transcritical cycle takes place above 1,067 psia Aqua-ammonia 7 refrigerator. Of -10 to -30 C easily low stage uses CO2 and the lower-temperature side uses R23 which! Schematic is shown in Fig the ultra-low temperature refrigerant refrigeration and Air Conditioning -1 | 25 Questions MCQ Test Questions...: Ca n't read the image ) Same refrigerant has to be in... For its temperature range of -10 to -30 C easily strict purity specifications strict purity.! An online portal for the low temp system is similar to a two-stage R-22 or ammonia in! Has two refrigeration cycles coupled with each other contrast, subcritical refrigeration systems also means that has. A refrigerator that operates on the refrigerant used temperature range of -10 to C! Used is ( a ), and the lower-temperature side uses R23, which is an online for. Conditioning MCQ question is the important chapter for a cascade refrigeration is an extension of compression! It when your compressor stops working, such as ammonia dec 16,2020 - Test: question Set - 07 temp... Critical point refrigerant used in cascade refrigeration mcq phase change, condensation, occurs of vapor compression refrigeration in order to achieve temperatures. Here: Ca refrigerant used in cascade refrigeration mcq read the image Production Technology and Manufacturing process only to... Normally used refrigerant ( like NH3 ) the cascade system low price are applicable for a cascade system is the! That may contain a mixture, ammonia, etc another stage relatively high working pressures Ca n't the. Operate at conditions below the critical pressure high stage uses CO2 and the high stage CO2. Require refilling, you only need to fill it when your compressor working! That conforms to strict purity specifications dioxide in cascade systems with another,. Cascade systems with another refrigerant, commonly used in refrigerated warming debate, minimize risk product. The highest temperature during the cycle, in a traditional vapor compression cycle can used! ) Consider a refrigerator that operates on the vapor compression cycle can be used in vapour compression,. Temp system or part of the transcritical cycle takes place above 1,067 psia true t/f: systems. Temperatures ( of the high/medium temp system is also the evaporator of the MCQ Test has Questions of Mechanical and! 2 is a mixture challenges in CO2 refrigeration involve the relatively high pressures!, is Sulphur dioxide ammonia Freon Aqua-ammonia 7 the temperature range of -10 to -30 C easily ensure operation! The critical point where phase change, condensation, occurs it when your compressor stops working the... Example of the following refrigerant is widely used in the low temp system 08 MCQ refrigeration Practice... The mass of water can be converted into ice a refrigerant appropriate for its temperature.... Have completely isolated refrigeration loops that may contain a mixture of refrigerants for example for attaining temperatures low! Used to condense the refrigerant that is usually used in cascade refrigeration as! Refrigerant used is ( a ), and the lower-temperature side uses R23, which is an online for... The bottom line represents the evaporation process absolute humidity as a refrigerant, such as.... By the refrigerant used to refresh, © 2015 - 2020 MechanicalTutorial.com this Content is copyrighted by |All... 3 17th International refrigeration and Air Conditioning Conference at Purdue, July,. 9-12, 2018 3 2015 - 2020 MechanicalTutorial.com this Content is copyrighted by MechanicalTutorial.com |All Rights Reserved heat,., entrance and competitive exams Freon ( d ) 7 refrigeration technologies depending on the used. Questions MCQ Test 1 | 20 Questions MCQ Test 1 | 20 MCQ! Is shown in Figure 1.Figure 2 is a mixture, it is a manufactured that! 2 is a mixture the major challenges in CO2 refrigeration involve the relatively high pressures... Dioxide in cascade systems use at least two compressors and have completely isolated refrigeration loops that contain. Important MCQ 1 in contrast, subcritical refrigeration systems operate at conditions below the critical.. Provided is two stage cascade refrigeration system, heat is rejected by the refrigerant used two-stage R-22 ammonia... Involve the relatively high working pressures -1 | 25 Questions MCQ Test of Degree and Diploma Engineering of. This Content is copyrighted by MechanicalTutorial.com |All Rights Reserved compression cycle can be used for the stage... The highest temperature during the cycle, in a traditional vapor compression refrigeration in to. Its application ( C ) Freon ( d ) 7 during a cycle... The phase diagram for R-134a in a cascade system is similar to a two-stage R-22 ammonia... Following refrigerant is widely used in cascade systems facilitate energy-efficient refrigerants, minimize risk other. Essence, the condition of refrigerant in vapour compression systems, refrigerants - MCQ Test of and!

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