3. c. either throttling valve or capillary tube . Free download in PDF Refrigeration and Air Conditioning Multiple Choice Questions and Answers for competitive exams. Friday, May 27, 2016. d) none of the mentioned 6. Q4. R134a is also known as Tetrafluoroethane (CF3CH2F) from the family of HFC refrigerant. b) false • Maintenance cost is low as because of absence of moving part. Electrolux refrigeration system? • 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. du Pont de Nemours & Company. The released vapor is passed to condenser and weak solution to absorber through a reducing valve. Explanation: The reason is that water cannot be cooled below 0 degree Celsius. (d) … The weak solution containing very little ammonia is spread in absorber. (adsbygoogle = window.adsbygoogle || []).push({}); Your email address will not be published. of reversed Carnot Cycle? 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) water is the refrigerant and ammonia is the absorbent d) none of the mentioned, https://www.youtube.com/watch?v=g754W6-_Zk0&list=PLelAq9xzEDXCZwXnq6z6f04dEhRqEWSmZ. (1 ton = 211kJ/min of cooling effect). What is the value of the … In absorption refrigeration cycle, which of the following is used? ... 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. Cooling capacity is the cooling produced per minute. 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. Q10. • In here pump is used for pumping refrigerant absorbant solution, which consumes less power. Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle? c) both of the mentioned Define refrigerants. 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. View Answer, Answer: a 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. Explanation: Both refrigerant and absorbent are used in absorption refrigeration cycle. What is an advantage using analyser-rectifier in aqua-ammonia absorption system? Explanation: This is done to prevent the blocking of expansion valve because of frozen ice. The wet bulb depression is zero when relative humidity equals, 6. • Corrosive in nature. This test is Rated positive by 93% students preparing for Mechanical Engineering.This MCQ test is related to Mechanical Engineering syllabus, prepared by Mechanical Engineering teachers. Q2. Q3. Find out latest Multiple Choice Questions with Answers on Refrigeration and Air Conditioning for exam preparation. Pick up the wrong statement. d. none of the above. MCQ Questions for RGPV Online exam 2020. Ans: b. a) true b) higher, richer  Space and Auto. Please read all the important question of that chapter because the MCQ comes from only this important topic. Wet compression is _____. Refrigeration and Air conditioning Mcqs. c) both of the mentioned 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.  Quiet in operation, low maintenance cost. However means of compression. ANSWER: c. an absorber-generator. 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. 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. Explanation: The saturation temperature of water is higher than ammonia at any given pressure. 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. Low Freezing Point. 2. View Answer. Which is the primary refrigerant in central air conditioning plant. The vapour compression refrigeration cycle operates on reversed, 4. Next . 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 that was commonly used in centrifugal chillers and before the 1970's it was used as a propellant for aerosols. Hence these systems are also called as heat operated or thermal energy driven systems. The COP of absorption refrigeration system is applications. First of all, please watch my important question videos of Rac, chapter wise after that you can visit here, where you show the answers to those questions and some MCQ regarding this chapter...... 2. Thus, the function of a compressor is done by absorber, a generator, pump and reducing valve. Required fields are marked *. Efficiency of a Carnot engine is given as 80%. 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. a) true In a ideal vapour absorption system the absorber pressure is equal to the pressure of, 3. Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. What is the condition of refrigerant at the exit of evaporator in aqua-ammonia absorption system? It is a low-pressure. Freons or halocarbons are synthetically produced. Multiple choice questions on Refrigeration and air conditioning - Set 13 MCQ Refrigeration Edit Practice Test: Question Set - 13. 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. MCQ-VAPOR COMPRESSION REFRIGERATION-2 Most commonly used method of refrigeration is vapor compression refrigeration. Properties of refrigerants? liquid pump generator absorber and generator absorber, generator and liquid pump ⇒ In vapour compression cycle using NH3 as refrigerant, initial charge is filled at suction of compressor delivery of compressor control requirements favor absorption system. Strong solution of aqua ammonia contains as much as ammonia as it can and weak solution contains less ammonia. 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 = … In a vapour absorption refrigerator , heat is rejected in, 5. a) absorbent ... Because the cycle works at very low pressure, the volumetric cooling capacity of water vapor is very low. A simple vapour compression system of refrigeration consists of the equipment as follows: (a) Compressor . Answer: a View Answer. In addition to fluorine and carbon, Freons often contain hydrogen, chlorine, or bromine. Advantages of using Vapor – Absorption Refrigeration System  No moving part except pump-motor, which is comparatively smaller than compressor system. d) none of the mentioned a) higher, less • Low working pressure. Vapour Compression Refrigeration Cycle - MCQs with Answers Q1. The schematic diagram of the arrangement is shown in Fig. a) ammonia vapour is absorbed in water The simple vapor compressor system is used where there is scarcity of Electricity and it is very useful at partial and full load. 2.1 Refrigeration and Air Conditioning Interview Questions and Answers pdf:-; 2.2 Refrigeration and Air Conditioning Interview Questions and Answers pdf :- Refrigeration and Air Conditioning Multiple Choice Questions :-1. However, the COP of actual VARS will be much less than that of … These short solved questions or quizzes are provided by Gkseries. Nov 17,2020 - Refrigeration Cycles And Systems - 3 | 30 Questions MCQ Test has questions of Mechanical Engineering preparation. In this system ammonia is used as refrigerant and solution is used is aqua ammonia. A refrigerant should have (a) Tow specific heat of liquid (b) high boiling point (c) high latent heat of vaporization (d) higher critical temperature (e) low specific volume of vapour. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. Water is used as a ____ in air conditioning units. Working of Simple Vapor absorption system: A Simple Vapor absorption system consists of evaporator, absorber, generator, condenser, expansion valve, pump & reducing valve. 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, ***************************************************************. 2. What is the condition of refrigerant at the exit of evaporator … c) equal to that of vapour compression refrigeration system 9. Thus, Freons are types of chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), and related compounds. View Answer. What is the purpose of analyser-rectifire in aqua-ammonia absorption system? Steam Jet refrigeration system ? The boiling point of ammonia is (A) -10.5°C (B) -30°C (C) -33.3°C (D) -77.7°C. (a) Air. Strong solution of aqua ammonia contains as much as ammonia as it can and weak solution contains less ammonia. Q9. 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. 2. Explanation: This is the basic absorption refrigeration cycle. 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. Vapor absorption refrigeration is also a vapor compression system. b) to decrease the amount of water vapour in ammonia vapour ANSWER: c. either throttling valve or capillary tube. Correct Answer. Wet compression in vapour compression cycle means, 2. b) water vapour a) low MCQ important questions || Rgpv online Exams, 1. • The load variations does not effect the performance of a vapour absorption system. Freon group of refrigerants are (A) Inflammable (B) Toxic (C) Non-inflammable and toxic (D) Nontoxic and non-inflammable. In this system ammonia is used as refrigerant and solution is used is aqua ammonia. R744 (CO2) is refrigerant grade CO2, used as a replacement for R134a and R404A in ultra-low, low and medium temperature refrigeration applications. a) refrigerant or 3 fluid refrigeration? Explanation: When passing through analyser, the vapour is cooled and enriched by ammonia. 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. throttling valve b. capillary tube c. either throttling valve or capillary tube d. none of the above View Answer / Hide Answer. The compressor of vapor compressor system is replaced by an absorber, generator, reducing valve and pump. Exam Questions; Mathematical Problems Strength of Materials; IC Engine; Refrigeration; MCQ Q&A; Contact Us! Major modification required to produce temperature of – 200?C in a vapour compression refrigeration system using Freon 12 as refrigerant, is, In a vapour absorption refrigeration system the power is required for vapour compressor as compared to that in vapour compression cycle is, Agriculture Ecology and General Silviculture Mcqs, Agriculture Genetics Plant Breeding and Biotechnology Mcqs, Fluid Mechanics and Hydraulic Machines Mcqs, Forest Types and Geographical Distribution Mcqs, Temperature Distribution and Ocean Salinity Mcqs. It is safe for normal handling as it is non-toxic, non-flammable and non-corrosive. Refrigeration and Air Conditioning – Mechanical Engineering 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. 5. why is an analyser-rectifier combination is used in absorption refrigeration cycle? Correct Answer. Explanation: The absorber-generator assembly involves less mechanical work. (even for above 1000 TR)  Can be operated at designed C.O.P’s or even at part loads by varying generator temperature. a cooling substance, as ice or solid carbon dioxide, used in a refrigerator, ), and Natural Refrigerants. Which of the following condenses first? c) lower, less Answer: d is also known as Tetrafluoroethane (CF3CH2F) from the family of HFC, . MCQs of Absorption Refrigeration System. View Answer. Pick up the wrong statement. Q1. Ans: b 2. 10. Vapour Absorption Refrigeration system: A Vapour absorption system utilizes the low-grade form of heat energy to produce Cold. The weak solution absorbs ammonia and gets converted into strong solution. Even though water (R718) is one of the oldest refrigerants, state of the art technology is required to use water as a refrigerant in compression refrigeration plants with turbo compressors. Explanation are … d) none of the mentioned In this system, the working substance is a refrigerant like NH 3, R-11, R-12.. Ans: a 6. View Answer. Ammonia vapors coming out of evaporator are drawn in absorber. 1.  Can work only with thermal energy as an input. Which type of energy is required to expend in vapour absorption refrigeration system? 8. (b) Water. • In the absorption refrigeration system no refrigerant produces the greenhouse effect, so their use won’t be stopped in future. 1. 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. In absorption refrigeration cycle, which of the following is used? Lithium Bromide absorption refrigeration system? d) none of the mentioned Q3. a. it makes ammonia-water solution strong, b. it prevents expansion valve from blocking due to ice formation, ANSWER: b. it prevents expansion valve from blocking due to ice formation, Q8. 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 … a liquid capable of vaporizing at a low temperature, as ammonia, used in mechanical, . Go To Download Page Close. Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle? (c) Freon-22. This set of Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on “Absorption Refrigeration Cycle”. Ans: b. ADVERTISEMENTS: (b) Condenser (c) Expansion valve (d) Evaporator . a) refrigerant Correct Answer. 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. -114 used in centrifugal chillers and high-ambient cooling applications, including overhead cranes. Compressor; Condenser ; Evaporator; Expansion valve; 2. Explanation: The boiling point of ammonia is less than that of water. The most common refrigerants include Chlorofluorocarbons (CFCs), Hydrochlorofluorocarbons (HCFCs), Hydrofluorocarbons (HFCs), and Natural Refrigerants. View Answer. MCQ-VAPOR ABSORPTION REFRIGERATION. 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. c) to eliminate the water vapour from ammonia vapour Answer: b 36.20. February 22, 2019 BILAL KHATTAK 0 . Answer: b 1. Ans: d 5. Q6. which will improve your skill. 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. View Answer. Answer: a The heat flow in the system at generator, and work is supplied to pump. a) ammonia vapour a. throttling valve. Answer: b Since conventional absorption systems use liquids for Explanation: In this, water is the refrigerant and solution of lithium bromide in water is the absorbent. agent, as a drug. 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