Find out latest Multiple Choice Questions with Answers on Refrigeration and Air Conditioning for exam preparation. Efficiency of a Carnot engine is given as 80%. d) none of the mentioned MCQ-VAPOR ABSORPTION REFRIGERATION. View Answer, Answer: a View Answer. b) boiling point of ammonia is more than that of water R744 (CO2) is refrigerant grade CO2, used as a replacement for R134a and R404A in ultra-low, low and medium temperature refrigeration applications. Contents. R134a is also known as Tetrafluoroethane (CF3CH2F) from the family of HFC refrigerant. In a vapour absorption refrigeration system, the compressor of the vapour compression system is replaced by Absorber, generator and liquid pump Nusselt number (NN) is given by A. NN = … R-11 is a colorless and odorless CFC refrigerant that was completely banned from production by 1996 under the Montreal Protocol for depleting the ozone. Q3. ... Because the cycle works at very low pressure, the volumetric cooling capacity of water vapor is very low. Advantages of using Vapor – Absorption Refrigeration System • As there is no moving part in the entire system, the operation is essentially quite and subjected to a very little wear. What is the condition of refrigerant at the exit of evaporator in aqua-ammonia absorption system? d) none of the mentioned Refrigeration and Air conditioning Mcqs. Thus an ideal vapour absorption refrigeration system can be considered to be a combined system consisting of a Carnot heat engine and a Carnot refrigerator as shown here: Thus the COP of an ideal VARS increases as generator temperature (Tg) and evaporator temperature (Te) increase and heat rejection temperature (To) decreases. Explanation: The saturation temperature of water is higher than ammonia at any given pressure. 36.20. 2. Working of Simple Vapor absorption system: A Simple Vapor absorption system consists of evaporator, absorber, generator, condenser, expansion valve, pump & reducing valve. Wet compression is _____. a) absorbent Correct Answer. Which is the primary refrigerant in central air conditioning plant. View Answer. 1 95 TOP MOST Refrigeration and Air Conditioning – Mechanical Engineering Multiple Choice Questions and Answers; 2 Refrigeration and Air Conditioning Interview Questions and Answers pdf. a liquid capable of vaporizing at a low temperature, as ammonia, used in mechanical, . ANSWER: c. either throttling valve or capillary tube . Q4. c) to eliminate the water vapour from ammonia vapour • Low working pressure. • Absorption system may be designed to use any readily available source of thermal energy such as process steam ,hot exhaust from furnaces and solar energy, therefore they can be used in places where electric power is hard to obtain or is very expensive. View Answer. Thus, Freons are types of chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), and related compounds. Answer: d Multiple Choice Questions with Answers on Refrigeration and Air-Conditioning - Set 07 MCQ Refrigeration Edit Practice Test: Question Set - 07. Space and Auto. a. throttling valve. Page-7 section-4 Page-7 section-4 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. c) absorbent and refrigerant Refrigeration and Air Conditioning Multiple Choice Questions :-1. The mechanical work required to run vapour absorption system, a. is more than the mechanical work required to run vapour compression system, b. is less than the mechanical work required to run vapour compression system, c. is similar to the mechanical work required to run vapour compression system, ANSWER: b. is less than the mechanical work required to run vapour compression system, Q2. applications. b) ammonia is the refrigerant and water is the absorbent 1. Refrigeration is measured in tons of refrigeration. Freon™ 124 (R-124) refrigerant is a hydrochlorofluorocarbon (HCFC) retrofit replacement for R-114 used in centrifugal chillers and high-ambient cooling applications, including overhead cranes. a. weak solution of ammonia in water is heated, b. strong solution of ammonia in water is heated, c. only water is heated and heat is given to the ammonia to form its vapour, ANSWER: b. strong solution of ammonia in water is heated, Q5. (A) 1.25 (B) 0.8 (C) 0.5 (D) 0.25. This Vapour Compression system mainly consists of a Refrigerator compressor, a liquid compressor, a liquid receiver, a refrigerant control valve also called as an Expansion valve and Evaporator. It is a low-pressure. (d) … In lithium bromide system, water is used as the refrigerant, which is also available cheap. The vapour going to condenser is ____ in temperature and ____ in ammonia. Strong solution of aqua ammonia contains as much as ammonia as it can and weak solution contains less ammonia. Vapour Compression Systems, Refrigerants - MCQ Test 2 QUESTION: 1 The values of enthalpy at the beginning of compression, at the end of compression and at the end of condensation are 185 kJ/kg, 210 kJ/kg and 85 kJ/kg respectively. What is an advantage using analyser-rectifier in aqua-ammonia absorption system? Friday, May 27, 2016. The schematic diagram of the arrangement is shown in Fig. ... Because the cycle works at very low pressure, the volumetric cooling capacity of water vapor is very low, is a hydrochlorofluorocarbon (HCFC) retrofit replacement for. Required fields are marked *. The low temperature, low pressure vapour at state B is compressed by the compressor. Electrolux refrigeration system? Q7. in the area of centrifugal, rotary screw, scroll and reciprocating compresssors. Vapor absorption refrigeration system is usually applied in small applications like home refrigerators and Small capacity AC’s. During a refrigeration cycle, heat is rejected by the refrigerant in a. In addition to fluorine and carbon, Freons often contain hydrogen, chlorine, or bromine. In this system ammonia is used as refrigerant and solution is used is aqua ammonia. 2.1 Refrigeration and Air Conditioning Interview Questions and Answers pdf:-; 2.2 Refrigeration and Air Conditioning Interview Questions and Answers pdf :- a cooling substance, as ice or solid carbon dioxide, used in a refrigerator, ), and Natural Refrigerants. d) none of the mentioned It is now being used as a replacement for. Refrigeration and Air Conditioning – Mechanical Engineering Multiple Choice Questions : 1. a) ammonia vapour Pick up the wrong statement. MCQ Questions for RGPV Online exam 2020. Vapour Absorption Refrigeration Systems (VARS) belong to the class of vapour cycles similar to vapour compression refrigeration systems. With the help of 4BEngineers, students can avail online coaching through video lecture at an unimaginably affordable cost, access the coaching content from renowned teaching experts, and be one on one with their personal favorite coach. ANSWER: c. an absorber-generator. Refrigerants should have low freezing point than the normal operating conditions. Water is used as a ____ in air conditioning units. Vapor absorption refrigeration is also a vapor compression system. Freons or halocarbons are synthetically produced. a) ammonia vapour is absorbed in water Refrigeration & Air-Conditioning MCQ Question with Answer Refrigeration & Air-Conditioning MCQ with detailed explanation for interview, entrance and competitive exams. Answer: a Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle? b. to remove water vapour out from ammonia after generator, c. to exchange heat between weak solution and strong solution, ANSWER: b. to remove water vapour out from ammonia after generator. The released vapor is passed to condenser and weak solution to absorber through a reducing valve. theoretical vapour absorption refrigeration system.but there is some additional equipment associated in the practical system.the additional features are analyser and rectifier.it is illustrated in figure 1.1.1. a) Analyser: When ammonia is vapourised in generator ,some water is also vapourised and will flow into the condenser along with ammonia vapour. a) low which will improve your skill. It is a low-pressure refrigerant that was commonly used in centrifugal chillers and before the 1970's it was used as a propellant for aerosols. This set of Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on “Absorption Refrigeration Cycle”. Ans: b. a) higher, less The wet bulb depression is zero when relative humidity equals, 6. What is the value of the … MCQs of Absorption Refrigeration System. It is now being used as a replacement for R-12 CFC refrigerant in the area of centrifugal, rotary screw, scroll and reciprocating compresssors. 3. Explanation: Both refrigerant and absorbent are used in absorption refrigeration cycle. ... With an Ozone Depleting Potential (ODP) of 0 and a Global Warming Potential (GWP) of 1, R744 (CO2) is a natural refrigerant. Properties of refrigerants? Explanation are … Ans: b 2. that was commonly used in centrifugal chillers and before the 1970's it was used as a propellant for aerosols. Ans: a 6. b) absorbent 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. d) none of the mentioned • In the absorption refrigeration system no refrigerant produces the greenhouse effect, so their use won’t be stopped in future. Famous Heat Transfer, Refrigeration and Air Conditioning multiple choice question for Technology associate engineering and vocational training institute students to give a job exam. c) both condense at same temperature 3. 6. In the aqua-ammonia absorption system, 2. 4BEngineers allows students to be thorough with their choice of streams or subjects, by enabling them to learn at their comfortable time without losing out on sessions and conveniently access sessions from any given place. It causes refrigeration from heat. b) to decrease the amount of water vapour in ammonia vapour • Initial cost is high. of reversed Carnot Cycle? -114 used in centrifugal chillers and high-ambient cooling applications, including overhead cranes. (1 ton = 211kJ/min of cooling effect). Q10. Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. Since conventional absorption systems use liquids for Hence these systems are also called as heat operated or thermal energy driven systems. Wet compression in vapour compression cycle means, 2. A.To cool the vapour leaving the analyzer B.To separate ammonia and water C.To dissolve ammonia in water D.To add energy from external source E.None of the above, Your email address will not be published. Pick up the wrong statement. In absorption system, compressor in vapour compression cycle is replaced by absorber-generator assembly. Pick up the wrong statement. Answer: a Freons or halocarbons are synthetically produced. is also known as Tetrafluoroethane (CF3CH2F) from the family of HFC, . Related posts: Water is used as a refrigerant in ; Which of the following has lowest COP? Correct Answer. Q1. Can be built for huge working capacities. Advantages of using Vapor – Absorption Refrigeration System No moving part except pump-motor, which is comparatively smaller than compressor system. Explanation: The absorber-generator assembly involves less mechanical work. Which of the following statement is true? The weak solution absorbs ammonia and gets converted into strong solution. In absorber of aqua-ammonia absorption refrigeration system, a. strong solution is taken in and weak solution is given out, b. weak solution is taken in and strong solution is given out, c. the ammonia vapour from strong solution is taken out and made it a weak solution, ANSWER: b. weak solution is taken in and strong solution is given out. b. capillary tube. a) to increase the amount of water vapour in ammonia vapour The name Freon is a trademark registered by E.I. b) high Answer: a Freon group of refrigerants are (A) Inflammable (B) Toxic (C) Non-inflammable and toxic (D) Nontoxic and non-inflammable. February 22, 2019 BILAL KHATTAK 0 . c. either throttling valve or capillary tube . Ammonia-absorption refrigeration cycle requires (a) very little work input (b) maximum work input (c) nearly same work input as for vapour compression cycle (d) zero work input (e) none of the above. What is the process carried out in generator of vapour absorption refrigeration cycle? The compressor of vapor compressor system is replaced by an absorber, generator, reducing valve and pump. A.To cool the vapour leaving the analyzer B.To separate ammonia and water C.To dissolve ammonia in water D.To add energy from external source E.None of the above. Ans: d 5. What is the condition of refrigerant at the exit of evaporator … Low Freezing Point. d) none of the mentioned (c) Freon-22. (adsbygoogle = window.adsbygoogle || []).push({}); Your email address will not be published. Explanation: The Cop of absorption refrigeration system is low, 11.In a vapour absorption refrigeration system the power is required for vapour compressor as compared to that in vapour compression cycle is, [A].More[B].Less[C].Half[D].One forth[E].There is no such relation, SSC-JE & RRB-JE(Mechanical) Full syllabus free video lectures:- https://www.4bengineers.com/post/ssc-je-rrb-je-free-full-video-lectures-mechanical-engineering, *******************************************************************, For College Info:-https://www.4bengineers.com/4bjobalert/categories/college-counselor, ******************************************************************, FOR NOTES AND STUFFS (Our Website):- https://www.4bengineers.com/, My Amazon Store for You:- https://www.amazon.in/shop/4bengineers?isVisitor=true, *************************************************************************, Telegram channel link:-https://t.me/ashish4Bengineers, **********************************************************************, For Job Updates :- https://www.4bengineers.com/4bjobalert, *************************************************************, Instagram:- https://www.instagram.com/4bengineers/?hl=en, Facebook:- https://www.facebook.com/4bengineers, ***************************************************************. Many chemical reactions are exothermic but these must take place at temperatures below atmospheric temperature therefore absorption refrigeration system is required to remove the heat of reaction. • Corrosive in nature. The vapour compression refrigeration cycle operates on reversed, 4. a) refrigerant Answer: c Compressor; Condenser ; Evaporator; Expansion valve; 2. Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle? a. throttling valve b. capillary tube c. either throttling valve or capillary tube d. none of the above View Answer / Hide Answer. or 3 fluid refrigeration? d) none of the mentioned, https://www.youtube.com/watch?v=g754W6-_Zk0&list=PLelAq9xzEDXCZwXnq6z6f04dEhRqEWSmZ. Q6. c) both ammonia and water can be used as refrigerant or absorbent For the same capacity of plant, the COP of the vapour absorption refrigeration system is, a. lower than the COP of the vapour compression refrigeration system, b. higher than the COP of the vapour compression refrigeration system, c. same as the COP of the vapour compression refrigeration system, ANSWER: a. lower than the COP of the vapour compression refrigeration system. Disadvantages of using Vapor - Absorption Refrigeration System • Set up is too large as it consists of three more equipment those are absorber, generator ,and pump. In this system, the working substance is a refrigerant like NH 3, R-11, R-12.. Answer: b a) water is the refrigerant and ammonia is the absorbent 1. d) all of the mentioned d) none of the mentioned The weak solution containing very little ammonia is spread in absorber. Answer: b The compressor in the vapour compression system id replaced by. In ammonia-water absorption refrigeration system, ammonia is used as the refrigerant, which is easily and cheaply available. Q1. View Answer. b) absorbent ... With an Ozone Depleting Potential (ODP) of 0 and a Global Warming Potential (GWP) of 1, , state of the art technology is required to use water as a, plants with turbo compressors. In a vapour absorption refrigerator , heat is rejected in, 5. In this system ammonia is used as refrigerant and solution is used is aqua ammonia. These short objective type questions with answers are very important for competitive exams. Exam Questions; Mathematical Problems Strength of Materials; IC Engine; Refrigeration; MCQ Q&A; Contact Us! b) refrigerant In absorption refrigeration cycle, which of the following is used? Vapor absorption refrigeration uses (a) Mechanical energy (b) Electric energy (c) Kinetic energy (d) None (Ans: d) Vapor absorption refrigeration uses (a) Mechanical energy (b) Electric energy (c) Heat … In absorption refrigeration cycle, which of the following is used? Vapor-compression refrigeration, in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for air-conditioning of buildings and automobiles. The simple vapor compressor system is used where there is scarcity of Electricity and it is very useful at partial and full load. Ans: b. Q2. b) false Explanation: In this, water is the refrigerant and solution of lithium bromide in water is the absorbent. MCQ-VAPOR COMPRESSION REFRIGERATION-2 Most commonly used method of refrigeration is vapor compression refrigeration. • The load variations does not effect the performance of a vapour absorption system. 1. Q3. The boiling point of ammonia is (A) -10.5°C (B) -30°C (C) -33.3°C (D) -77.7°C. b) higher, richer c. low pressure strong vapour mixture of ammonia and water, d. high pressure strong vapour mixture of ammonia and water. Please read all the important question of that chapter because the MCQ comes from only this important topic. The classification also depends on their chemical elements chlorine (Cl), hydrogen (H), carbon (C), and Florine (F), that was completely banned from production by 1996 under the Montreal Protocol for depleting the ozone. It is safe for normal handling as it is non-toxic, non-flammable and non-corrosive. 1. The classification also depends on their chemical elements chlorine (Cl), hydrogen (H), carbon (C), and Florine (F). 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