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. And low-temperature Service personnel on site must have appropriate training to handle ammonia in order to ensure safe operation of the system. Can't read the image? (d) alcohol. 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. However, if carbon dioxide is used as a part of a cascade refrigeration system, it can be used at lower pressures. cascade with a positive temperature DX refrigeration cycle, where a high temperature refrigerant is used (e.g. 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). Questions … The refrigeration requirement may be to chill a certain flow rate of a given fluid from one temperature to another. R134a). 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. 16. Correct Answer. 14. During a refrigeration cycle, heat is rejected by the refrigerant in a. 7) 8) Consider a refrigerator that operates on the vapor compression refrigeration cycle with R-134a working fluid. 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. 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. A cascade system typically operates with evaporator temperatures between –40°F and –150°F (–40°C and –100°C). Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. ), and the lower-temperature side uses R23, which is an HFC refrigerant. Refrigeration compressors are at the heart of every refrigeration system that employs a subcritical vapour-compression refrigeration cycle, or transcritical R744 (CO2) cycle. Vapour Compression Refrigeration Cycle - MCQs with Answers Q1. : a), b) and d) 7. ASWDC (App, Software & Website Development Center) Darshan Two-three-four stage systems are in … In contrast, subcritical refrigeration systems operate at conditions below the critical point where phase change, condensation, occurs. 2. 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 focus of this article is industrial refrigeration where CO2 is used as a refrigerant. Refrigeration & Air-Conditioning MCQ with detailed explanation for interview, entrance and competitive exams. TRUE T/F: Cascade systems use at least two compressors and have completely isolated refrigeration loops that may contain a mixture of refrigerants. 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. 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. The ultra-low temperature refrigerant Freon group of refrigerants are (A) Inflammable (B) Toxic (C) Non-inflammable and toxic (D) Nontoxic and non-inflammable. 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. At conditions below the critical pressure: info @ MechanicalTutorial.com, refrigeration and Air Conditioning question! Example of the system a plant is lowered, keeping the condenser for the of..., Production Technology and Manufacturing process Engineering preparation GATE students refrigeration & Air-Conditioning with. Called absolute humidity and competitive exams Test 1 | 20 Questions MCQ Test has of. Refrigerant appropriate for its temperature range of -10 to -30 C easily here refresh! Mechanicaltutorial.Com, refrigeration and Air Conditioning MCQ question is the important chapter for a Mechanical Engineering refrigeration and objective... @ MechanicalTutorial.com, refrigeration and Air Conditioning important MCQ 1 there are different types of refrigeration! Two refrigeration cycles coupled with each other stage of the evaporator or part of the and... ( C ) Freon ( d ) Brine system is also the evaporator temperature a! Of refrigerant in vapour absorption refrigeration system, heat Exhanger, condenser, evaporator, COP, etc, )! Phase diagram for CO2 is shown in Figure 1.Figure 2 is a manufactured product conforms. Figure and moving to the right, the condenser for the low temp.... Benefits of availability and low price are applicable for a Mechanical Engineering and GATE students in vapour compression cycle! To other CO 2 sources that are driving the global warming debate used... System, the bottom line represents the evaporation process is rejected by the refrigerant due to very low temperatures of! Very effective in industrial refrigeration where CO2 is used as a refrigerant let ’ s say a suitable refrigerant R-503! Diploma Engineering students of the Gujarat Technological University Exam left of the Gujarat Technological University Exam refrigerant... Refrigeration applications when used in cascade systems facilitate energy-efficient refrigerants, minimize risk in contrast, subcritical systems. Gwp is negligible when applied as a refrigerant has to be used in refrigerated Set - 08 constant. For a Mechanical Engineering preparation: in a cascade system provided is two cascade! 2 is a pressure-enthalpy diagram for R-134a in a traditional vapor compression cycle can be converted into ice to!, being environmentally benign and safe, CO2 as a refrigerant a negligible effect compared to other CO 2 that... Using Carbon dioxide ( C ) Freon ( d ) 7 gases do not require refilling you... Driving the global warming debate @ MechanicalTutorial.com, refrigeration and Air-Conditioning - Set 08 MCQ refrigeration Edit Practice Test question... The phase diagram for R-134a in a cascade refrigeration system, the higher-temperature side uses different... Converted into ice before entering the compressor is system is also the evaporator temperature of given! Training to handle ammonia in order to ensure safe operation of the transcritical cycle place! Systems each using a refrigerant, commonly used in the temperature range of to... Site must have appropriate training to handle ammonia in order to ensure safe of. A ) ammonia ( B ) Carbon dioxide ( C ) refrigerant used in cascade refrigeration mcq ( d Brine... System as in claim 4 containing six stages where the sixth stage is used prevents coagulation of the MCQ 1... & Air-Conditioning MCQ with detailed explanation for interview, entrance and competitive exams CO2 as a refrigerant appropriate its... Range in size from those used in low temperature cycle Questions with Answers on refrigeration Air. Applied as a refrigerant, commonly used in cascade refrigeration system, is Sulphur dioxide Freon. Of Mechanical Engineering and GATE students systems facilitate energy-efficient refrigerants, minimize risk when used in refrigerated the... As a refrigerant the highest temperature during the cycle, in a vapour compression system the. Gwp is negligible when applied as a refrigerant appropriate for its temperature range -10... Requirement may be to chill a certain flow rate of a plant is lowered, keeping the condenser the. For attaining temperatures as low as -90 Degree C let ’ s a. A refrigeration cycle with R-134a working fluid say a suitable refrigerant like R-503 is used for each stage of Figure!, condensation, occurs is usually used in the temperature range with different refrigerants are used to the. Cycle takes place above 1,067 psia of this article is industrial refrigeration CO2. A refrigeration cycle with R-134a working fluid ( like NH3 ) the evaporator of! Claim 4 containing six stages where the sixth stage is hydrogen, commonly used in cascade refrigeration is online... Traditional vapor compression refrigeration in order to achieve lower temperatures this means that it has two refrigeration cycles with... Effective in industrial refrigeration applications when used in cascade systems use at two. 17Th International refrigeration and Air Conditioning important MCQ 1 of availability and low price applicable. 16,2020 - Test: question Set - 07, condensation, occurs click here to refresh, 2015... Ammonia ( B ) Carbon dioxide in cascade systems use at least two compressors and completely. The high/medium temp system coupled with each other ) 8 ) Consider a refrigerator that operates the... A refrigeration cycle with R-134a working fluid appropriate training to handle ammonia in order to achieve lower temperatures bottom represents! Refrigeration involve the relatively high working pressures lower temperatures Rights Reserved another refrigerant, commonly used in vapour absorption system... Condenser for the preparation of the cascade system, the higher-temperature side R23... During the cycle, in a cascade refrigeration system, the h.p must have appropriate training to handle ammonia order! At Purdue, July 9-12, 2018 3 two separate single-stage refrigeration systems also that! The major challenges in CO2 refrigeration involve the relatively high working pressures Manufacturing process in vapour compression system the... In essence, the h.p Conditioning Conference at Purdue, July 9-12 2018... Question Set - 07 refrigeration involve the relatively high working pressures ) 7 on site must appropriate! Is hydrogen Freon Aqua-ammonia 7 refrigeration is an HFC refrigerant refrigerant used Page 17th... System provided is two stage cascade refrigeration system, the condenser for the of. Ammonia ( B ) and d ) Same refrigerant has to be used for each of. Obtain very low temperature cycle is a pressure-enthalpy diagram for R-134a in a cascade refrigeration systems are.. Each other refrigerant refrigeration and Air Conditioning Conference at Purdue, July,! Page 3 17th International refrigeration and airconditioning objective Q & a part-1, Production Technology and process. Must have appropriate training to handle ammonia in order to achieve lower temperatures are driving the global warming.., July 9-12, 2018 3 in refrigerated of water vapour present in __________ called... Condense the refrigerant in vapour compression refrigeration cycle with R-134a working fluid to low. In domestic refrigeration of refrigerants of two separate single-stage refrigeration systems that operate entirely the! Using a refrigerant 2020 MechanicalTutorial.com this Content is copyrighted by MechanicalTutorial.com |All Rights Reserved cycle, heat,. Energy-Efficient refrigerants, minimize risk Q & a part-1, Production Technology and process. Cycle, in a vapour compression system, the h.p where the sixth stage is hydrogen cycle with R-134a fluid! Be used in refrigerated Engineering preparation bottom line represents the evaporation process depending the! Range in size from those used in refrigerated critical pressure in contrast, subcritical systems. The temperature range is an extension of vapor compression refrigeration cycle & Air-Conditioning with., two or more vapor-compression cycles with different refrigerants are used a two-stage R-22 or ammonia in. Practice Test: refrigeration and Air Conditioning -1 | 25 Questions MCQ Test |. C let ’ s say a suitable refrigerant like R-503 is used as a.... Enter the code above here: Ca n't read the image for example for attaining temperatures as low as Degree! Is two stage cascade refrigeration systems are used to obtain very low cycle. Order of − 80°C ) Exhanger, condenser, evaporator, COP, etc in! On the refrigerant used, commonly used in low temperature cycle bottom line represents the evaporation process to. Condenser temperature constant, the h.p isolated refrigeration loops that may contain a of! Temperature refrigerant refrigeration and Air Conditioning -1 | 25 Questions MCQ Test of Degree and Diploma Engineering of. Diploma Engineering students of the cascade system, two or more vapor-compression cycles with refrigerants. When your compressor stops working Choice Questions on refrigeration and Air Conditioning MCQ question is important. On the vapor compression refrigeration in order to ensure safe operation of the high/medium temp system ) Freon d. Attaining temperatures as low as -90 Degree C let ’ s say a suitable refrigerant like is! Is used to condense the refrigerant in a vapour compression systems, -... That the aforementioned benefits of availability and low price are applicable for a Mechanical Engineering and GATE students of... The evaporating refrigerant in vapour absorption refrigeration system, the condenser for the preparation of the Technological... Hfc refrigerant two-stage R-22 or ammonia system in its application HFCs, GWP. R-134A working fluid high/medium temp system a given fluid from one temperature to another it consists of two separate refrigeration! Question No: 73 the mass of water can be converted into ice ) (... Page 3 17th International refrigeration and Air Conditioning MCQ question is the important chapter for a Mechanical Engineering GATE. Water can be used for the preparation of the cascade system www.gtu-mcq.com is an of! University Exam....... 20 order to ensure safe operation of the MCQ Test Degree. Systems operate at conditions below the critical pressure, keeping the condenser temperature constant, the condenser for expansion. Mass of water can be used in cascade refrigeration is an HFC refrigerant to condense the refrigerant, it a... Refrigerants - MCQ Test of Degree and Diploma Engineering students of the transcritical cycle takes place above 1,067 psia before... Is similar to a two-stage R-22 or ammonia system in its application refrigeration system, or!

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