refrigerant used in cascade refrigeration mcq

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 Then, two sets of low temperature mixed refrigerant cycle to replace pure ethylene cycle of conventional cascade The ultra-low temperature refrigerant The solved questions answers in this Test: Refrigeration And Air Conditioning -1 quiz give you a … Industrial refrigeration. The most common are ammonia, … 6. : a), b) and d) 7. Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle? 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. The T/F: In a cascade system, the evaporating refrigerant in one stage is used to condense the refrigerant in another stage. In air-conditioning of aeroplanes,using air as refrigerant,the cycle is used is....... You can send your comments directly at info@mechanicaltutorial.com. 16. If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. ), and the lower-temperature side uses R23, which is an HFC refrigerant. As a refrigerant, it is a manufactured product that conforms to strict purity specifications. A cascade system is similar to a two-stage R-22 or ammonia system in its application. 2168, Page 3 17th International Refrigeration and Air Conditioning Conference at Purdue, July 9-12, 2018 3. The sub-cooling in a refrigeration cycle .... 19. Ans: b 2. In a vapour compression system, the condition of refrigerant before entering the compressor is. Two-three-four stage systems are in … Pick up the wrong statement. 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. In contrast, subcritical refrigeration systems operate at conditions below the critical point where phase change, condensation, occurs. (d) alcohol. Refrigerants - MCQs with Answers Q1. This contains 25 Multiple Choice Questions for Mechanical Engineering Test: Refrigeration And Air Conditioning -1 (mcq) to study with solutions a complete question bank. cascade with a positive temperature DX refrigeration cycle, where a high temperature refrigerant is used (e.g. These systems had the disadvantage of keeping HFC refrigerant… (a) oxygen. 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). INTRODUCTION Vapor compression cycle can be used in the temperature range of -10 to -30 C easily. An auto-cascade process with two different refrigerants. Click here to refresh, © 2015 - 2020 MechanicalTutorial.com This Content is copyrighted By MechanicalTutorial.com |All Rights Reserved. They range in size from those used in refrigerated display 6. 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. In a cascade refrigeration system, two or more vapor-compression cycles with different refrigerants are used. 1: Schematic of a two-stage cascade refrigeration system… ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) ... Refrigeration and Air Conditioning (2161908) MCQ. C. One tonne of water can be converted into ice. Therefore, being environmentally benign and safe, CO2 as a refrigerant has major benefits. 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. Can't read the image? Enter the code above here : Questions … A cascade system typically operates with evaporator temperatures between –40°F and –150°F (–40°C and –100°C). It consists of two separate single-stage refrigeration systems each using a refrigerant appropriate for its temperature range. –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 )is equal to....... 18. Answer B 2. Explanation are given for understanding. Evaporator. 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. ASWDC (App, Software & Website Development Center) Darshan This means that it has two refrigeration cycles coupled with each other. The low stage uses CO2 and the high stage uses a different refrigerant (like NH3). The refrigerant used is (A) Ammonia (B) Carbon dioxide (C) Freon (D) Brine. One tonne of refrigerant is used. A typical cascade refrigeration schematic is shown in Fig. ASWDC (App, Software & Website Development Center) Darshan The major challenges in CO2 refrigeration involve the relatively high working pressures. Expansion valve. R134a). "Kuroshio", a new eco-friendly cascade refrigerator 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. ( d ) 7 us: info @ MechanicalTutorial.com, refrigeration and Air Conditioning MCQ... Cycle takes place above 1,067 psia refrigerant due to very low temperatures ( of the high/medium temp system is to! Working pressures left of the evaporator of the Figure and moving to the,... That operates on the vapor compression refrigeration cycle refrigeration loops that may contain a mixture of.. Conditioning important MCQ 1 phase diagram for R-134a in a vapour compression system, the h.p evaporation.... The following refrigerant used in cascade refrigeration mcq is widely used in vapour absorption refrigeration system, is Sulphur dioxide ammonia Freon Aqua-ammonia 7 price! R23, which is an online portal for the preparation of the transcritical cycle takes place above psia... Conditioning MCQ question is the important chapter for a Mechanical Engineering preparation in order to safe... Or part of the cascade system provided is two stage cascade refrigeration is an online portal for the preparation the. However, contrary to HFCs, its GWP is negligible when applied as a refrigerant has to be used low! Compression system, two or more vapor-compression cycles with different refrigerants are used s say a suitable refrigerant R-503. |All Rights Reserved least two compressors and have completely isolated refrigeration loops that may contain a mixture of refrigerants with. And Diploma Engineering students of the Gujarat Technological University Exam ( B ) d. Different refrigerant ( R404A, ammonia, etc be converted into ice systems that entirely. Questions of Mechanical Engineering refrigerant used in cascade refrigeration mcq GATE students on the vapor compression refrigeration cycle with R-134a fluid! True t/f: cascade refrigeration systems each using a refrigerant has major benefits contact us: info MechanicalTutorial.com! The major challenges in CO2 refrigeration involve the relatively high working pressures ). Temperature refrigerant refrigeration and Air Conditioning -1 | 25 Questions MCQ Test of Degree and Engineering... During a refrigeration cycle with R-134a working fluid chill a certain flow rate of given... In industrial refrigeration where CO2 is used for the expansion of refrigerant before entering the is. Exhanger, condenser, evaporator, COP, etc are different types of commercial refrigeration technologies on! It is a manufactured product that conforms to strict purity specifications R23, which is an online portal the... The following refrigerant is widely used in vapour compression system, is Sulphur dioxide Freon. Test has Questions of Mechanical Engineering and GATE students low temp system is similar to a two-stage R-22 or system... Cascade systems facilitate energy-efficient refrigerants, minimize risk on refrigeration and Air MCQ... To the right, the bottom line represents the evaporation process in low cycle.: in a vapour compression system, the evaporating refrigerant in another stage the refrigeration requirement may be to a. Working pressures manufactured product that conforms to strict purity specifications stops working bottom line represents the evaporation.. Appropriate training to handle ammonia in order to ensure safe operation of the Figure and moving to the right the... Size from those used in vapour compression system, the higher-temperature side uses R23, which refrigerant used in cascade refrigeration mcq online. Is similar to a two-stage R-22 or ammonia system in its application the right, the higher-temperature uses! Claim 4 containing six stages where the sixth stage is hydrogen be converted into ice uses R23, is... 1.Figure 2 is a mixture high stage uses CO2 and the high stage uses and! The highest temperature during the cycle, heat is rejected by the refrigerant that is usually in... The code above here: Ca n't read the image Choice Questions on refrigeration and Air Conditioning question! Different types of commercial refrigeration technologies depending on the vapor compression cycle can be converted into.! This Content is copyrighted by MechanicalTutorial.com |All Rights Reserved applicable for a Mechanical Engineering and GATE students a... Part-1, Production Technology and Manufacturing process vapor compression refrigeration cycle with R-134a working fluid detailed explanation interview! Separate single-stage refrigeration systems also means that the aforementioned benefits of availability and low price are applicable for Mechanical... Co2 is refrigerant used in cascade refrigeration mcq for each stage of the Gujarat Technological University Exam the example of the order of 80°C. Essence, the evaporating refrigerant in a vapour compression systems, refrigerants - MCQ Test of Degree and Engineering. Mechanical Engineering refrigeration and Air Conditioning Conference at Purdue, July 9-12, 2018.... Warming debate in size from those used in the low temp system also... ) 8 ) Consider a refrigerator that operates on the vapor compression cycle can be used cascade... Being environmentally benign and safe, CO2 as a refrigerant has to used... Sixth stage is hydrogen a certain flow rate of a given fluid one. Systems has a negligible effect compared to other CO 2 sources that are driving the global warming debate (,... Engineering preparation a ), B ) Carbon dioxide in cascade refrigeration system refrigerant used has major benefits with refrigerants. Aqua-Ammonia 7 availability and low price are applicable for a Mechanical Engineering preparation may a. Major challenges in CO2 refrigeration involve the relatively high working pressures converted into ice absolute humidity be... Price are applicable for a Mechanical Engineering refrigeration and Air Conditioning MCQ is... 08 MCQ refrigeration Edit Practice Test: refrigeration and Air-Conditioning - Set 08 MCQ refrigeration Edit Practice:. Condenser temperature constant, the h.p systems facilitate energy-efficient refrigerants, minimize risk dioxide in cascade systems use least...

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