are different.  Can be built for huge working capacities. d) none of the mentioned Answer: b Correct Answer. 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. control requirements favor absorption 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. Ans: b. Answer: a Answer: c Refrigeration and air conditioning mcq questions converted ... vortex refrigeration cycle (Ans:c) In vapour absorption refrigeration system, heat is rejected in (a) condenser only (b) generator only (c) absorber only (d) condenser and absorber (Ans:d) An Electrolux refrigerator uses (a) one pump (b) two pump (c) no pump (d) three pump 19. b) false View Answer, Answer: a 2. Friday, May 27, 2016. a) ammonia vapour d) none of the mentioned 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. 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. View Answer. c. low pressure strong vapour mixture of ammonia and water, d. high pressure strong vapour mixture of ammonia and water. a) absorbent View Answer. 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. However, the COP of actual VARS will be much less than that of … If the cycle direction be reversed, what will be the value of C.O.P. In this system, the working substance is a refrigerant like NH 3, R-11, R-12.. grade CO2, used as a replacement for R134a and R404A in ultra-low, low and medium temperature. Efficiency of a Carnot engine is given as 80%. Explanation: The absorber-generator assembly involves less mechanical work. Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle? This set of Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on “Absorption Refrigeration Cycle”. a) refrigerant b) water vapour 2. 6. In this system ammonia is used as refrigerant and solution is used is aqua ammonia. Refrigeration and Air conditioning Mcqs. b) boiling point of ammonia is more than that of water • The load variations does not effect the performance of a vapour absorption system. Refrigeration & Air-Conditioning MCQ Question with Answer Refrigeration & Air-Conditioning MCQ with detailed explanation for interview, entrance and competitive exams. View Answer. Refrigeration and Air Conditioning – Mechanical Engineering Multiple Choice Questions : 1. 2. 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. • Low working pressure. Required fields are marked *. Ammonia vapors coming out of evaporator are drawn in absorber. du Pont de Nemours & Company. Next . 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 … 9. 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, ***************************************************************. Nov 17,2020 - Refrigeration Cycles And Systems - 3 | 30 Questions MCQ Test has questions of Mechanical Engineering preparation. Lithium Bromide absorption refrigeration system?  Space and Auto. MCQ-VAPOR COMPRESSION REFRIGERATION-2 Most commonly used method of refrigeration is vapor compression refrigeration. These short objective type questions with answers are very important for competitive exams. applications. 8. The compressor of vapor compressor system is replaced by an absorber, generator, reducing valve and pump. View Answer. View Answer. Find out latest Multiple Choice Questions with Answers on Refrigeration and Air Conditioning for exam preparation. 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. a cooling substance, as ice or solid carbon dioxide, used in a refrigerator, ), and Natural Refrigerants. Which of the following condenses first? For a same pressure the saturation temperature of ammonia is, a. higher than the saturation temperature of water, b. lower than the saturation temperature of water, c. same as the saturation temperature of water, ANSWER: b. lower than the saturation temperature of water. 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. agent, as a drug. Advantages of using Vapor – Absorption Refrigeration System  No moving part except pump-motor, which is comparatively smaller than compressor system. Hence these systems are also called as heat operated or thermal energy driven systems. Steam Jet refrigeration system ? Vapour Absorption Refrigeration Systems (VARS) belong to the class of vapour cycles similar to vapour compression refrigeration systems. Q7. The addition of heat liberates ammonia vapor and solution gets converted into weak solution. 5. why is an analyser-rectifier combination is used in absorption refrigeration cycle?  Quiet in operation, low maintenance cost. 3. Explanation: When passing through analyser, the vapour is cooled and enriched by ammonia. The boiling point of ammonia is (A) -10.5°C (B) -30°C (C) -33.3°C (D) -77.7°C. Q4. 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. b) to decrease the amount of water vapour in ammonia vapour The classification also depends on their chemical elements chlorine (Cl), hydrogen (H), carbon (C), and Florine (F). View Answer. c) to eliminate the water vapour from ammonia vapour a) low  In ammonia-water absorption refrigeration system, ammonia is used as the refrigerant, which is easily and cheaply available. a) to increase the amount of water vapour in ammonia vapour Answer: c R134a is also known as Tetrafluoroethane (CF3CH2F) from the family of HFC refrigerant. The vapour going to condenser is ____ in temperature and ____ in ammonia. • In here pump is used for pumping refrigerant absorbant solution, which consumes less power. c) both ammonia and water can be used as refrigerant or absorbent R744 (CO2) is refrigerant grade CO2, used as a replacement for R134a and R404A in ultra-low, low and medium temperature refrigeration applications. This strong solution from absorber is pumped into generator. TOP Refrigeration and Air Conditioning -Mechanical Engineering Multiple choice Questions and Answers ListBell-coleman (e) none of the above. 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. 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. 7. Electrolux refrigeration system? In a vapour absorption refrigerator , heat is rejected in, 5. During a refrigeration cycle, heat is rejected by the refrigerant in a. Multiple choice questions on Refrigeration and air conditioning - Set 13 MCQ Refrigeration Edit Practice Test: Question Set - 13. 1. ... 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. Thus, Freons are types of chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), and related compounds. Working of Simple Vapor absorption system: A Simple Vapor absorption system consists of evaporator, absorber, generator, condenser, expansion valve, pump & reducing valve. The vapour compression refrigeration cycle operates on reversed, 4. 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. The COP of absorption refrigeration system is Lithium bromide-water vapour is another absorption refrigeration system. Strong solution of aqua ammonia contains as much as ammonia as it can and weak solution contains less ammonia. Correct Answer. The heat flow in the system at generator, and work is supplied to pump. What is the condition of refrigerant at the exit of evaporator in aqua-ammonia absorption system? 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. 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. c) lower, less b) refrigerant Wet compression is _____. It is a low-pressure. 3. 1. that was commonly used in centrifugal chillers and before the 1970's it was used as a propellant for aerosols. 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. Explanation: In this, water is the refrigerant and solution of lithium bromide in water is the absorbent. c. either throttling valve or capillary tube . It is safe for normal handling as it is non-toxic, non-flammable and non-corrosive. Define refrigerants. Q3. ... Because the cycle works at very low pressure, the volumetric cooling capacity of water vapor is very low. Expression for mass of motive steam required ? What is an advantage using analyser-rectifier in aqua-ammonia absorption system? ... With an Ozone Depleting Potential (ODP) of 0 and a Global Warming Potential (GWP) of 1, R744 (CO2) is a natural refrigerant. Which of the following statement is true? Correct Answer. b) absorbent A simple vapour compression system of refrigeration consists of the equipment as follows: (a) Compressor . Vapour Absorption refrigeration system || Chapter-3 || RAC || Rgpv Important Theory & Mcq Questions, (Rgpv online exam important questions & answers 2020 )|| Chp-2|| RAC ), Important Questions Chapter wise All subject playlist:-, Vapour Absorption refrigeration system || Important Theory Questions. (d) … MCQ-VAPOR ABSORPTION REFRIGERATION. b. capillary tube. d. none of the above. Refrigeration and Air Conditioning Multiple Choice Questions :-1. Ans: b 2. Explanation: This is the basic absorption refrigeration cycle. 2. b) false February 22, 2019 BILAL KHATTAK 0 . MCQ ~ Vapour Compression Refrigeration System 1. View Answer. 36.20. 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. 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 = … (adsbygoogle = window.adsbygoogle || []).push({}); Your email address will not be published. Answer: b Freons or halocarbons are synthetically produced. Vapour Compression Refrigeration Cycle - MCQs with Answers Q1. Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. c) both of the mentioned c) both condense at same temperature Ans: d 5. 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. Properties of refrigerants? 10. View Answer. in the area of centrifugal, rotary screw, scroll and reciprocating compresssors. Answer: d (a) Air. MCQ Questions for RGPV Online exam 2020. 1. What is the purpose of analyser-rectifire in aqua-ammonia absorption system? MCQs of Absorption Refrigeration System. • Due to low working pressure the cop of vapour refrigeration is low, it is about 1.1 • High heat rejection system is required, as heat is being rejected from condenser, analyzer, rectifier and absorber. a) ammonia vapour is absorbed in water In absorption refrigeration cycle, which of the following is used? The wet bulb depression is zero when relative humidity equals, 6. Multiple Choice Questions with Answers on Refrigeration and Air-Conditioning - Set 07 MCQ Refrigeration Edit Practice Test: Question Set - 07. a. throttling valve b. capillary tube c. either throttling valve or capillary tube d. none of the above View Answer / Hide Answer. It is now being used as a replacement for. Q4. -114 used in centrifugal chillers and high-ambient cooling applications, including overhead cranes. Explanation: Both refrigerant and absorbent are used in absorption refrigeration cycle. 1. 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. (c) Freon-22. Q6. Wet compression is _____. Which is the primary refrigerant in central air conditioning plant. Q6. a) higher, less However, unlike vapour compression refrigeration systems, the required input to absorption systems is in the form of heat. Q1. 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. Please read all the important question of that chapter because the MCQ comes from only this important topic. c) both of the mentioned It is safe for normal handling as it is non-toxic, non-flammable and non-corrosive. 1. In absorption system, compressor in vapour compression cycle is replaced by absorber-generator assembly. Explanation: The reason is that water cannot be cooled below 0 degree Celsius.  Can work only with thermal energy as an input. Vapor absorption refrigeration system is usually applied in small applications like home refrigerators and Small capacity AC’s. ADVERTISEMENTS: (b) Condenser (c) Expansion valve (d) Evaporator . is also known as Tetrafluoroethane (CF3CH2F) from the family of HFC, . Q10. However means of compression. Refrigeration is measured in tons of refrigeration. Go To Download Page Close. d) lower, richer ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) Ans: b. Refrigerants should have low freezing point than the normal operating conditions. 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. Low Freezing Point. Q2. (1 ton = 211kJ/min of cooling effect). a) true The weak solution absorbs ammonia and gets converted into strong solution. Pick up the wrong statement. It is now being used as a replacement for R-12 CFC refrigerant in the area of centrifugal, rotary screw, scroll and reciprocating compresssors. Strong solution of aqua ammonia contains as much as ammonia as it can and weak solution contains less ammonia. (b) Water. • Maintenance cost is low as because of absence of moving part. c) equal to that of vapour compression refrigeration system The low temperature, low pressure vapour at state B is compressed by the compressor. d) all of the mentioned In addition to fluorine and carbon, Freons often contain hydrogen, chlorine, or bromine. What is the condition of refrigerant at the exit of evaporator … 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. c) absorbent and refrigerant 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. b) high What is the process carried out in generator of vapour absorption refrigeration cycle? Q9. The most common refrigerants include Chlorofluorocarbons (CFCs), Hydrochlorofluorocarbons (HCFCs), Hydrofluorocarbons (HFCs), and Natural Refrigerants. The weak solution containing very little ammonia is spread in absorber. Since conventional absorption systems use liquids for • Corrosive in nature. 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. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. d) none of the mentioned ANSWER: c. an absorber-generator. Free download in PDF Refrigeration and Air Conditioning Multiple Choice Questions and Answers for competitive exams. 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. ... 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. of reversed Carnot Cycle? Q3. In this system ammonia is used as refrigerant and solution is used is aqua ammonia. Explanation are … Explanation: The boiling point of ammonia is less than that of water. Vapour Absorption Refrigeration system: A Vapour absorption system utilizes the low-grade form of heat energy to produce Cold. Which type of energy is required to expend in vapour absorption refrigeration system? Ans: a 6. ANSWER: c. either throttling valve or capillary tube. The released vapor is passed to condenser and weak solution to absorber through a reducing valve. b) higher, richer ANSWER: c. either throttling valve or capillary tube . Answer: a 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. d) none of the mentioned Compressor; Condenser ; Evaporator; Expansion valve; 2. Related posts: Water is used as a refrigerant in ; Which of the following has lowest COP? Answer: a Q2. Working of Simple Vapor absorption system: A Simple Vapor absorption system consists of evaporator, absorber, generator, condenser, expansion valve, pump & reducing valve. 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. Conditioning MCQ Question is the process carried out in generator of vapour absorption system reason... Mixture of ammonia and water, d. high pressure strong vapour mixture of ammonia gets... Capable of vaporizing at a low temperature, as ammonia as it is non-toxic non-flammable... Mcq with detailed Explanation for interview, entrance and competitive exams from only this important topic can and solution....Push ( { } ) ; Your email address will not be published,... As because of frozen ice refrigeration consists of the mentioned d ) 0.25 and gets converted strong. Using analyser-rectifier in aqua-ammonia absorption system an online portal for the expansion of refrigerant at the exit of …... An advantage using analyser-rectifier in aqua-ammonia absorption system in this system ammonia is less that... And non-corrosive less Mechanical work these short objective type Questions with Answers Q1 operating conditions Conditioning Mechanical... The arrangement is shown in Fig odorless CFC refrigerant that was completely banned from production by 1996 under Montreal... The area of centrifugal, rotary screw, scroll and reciprocating compresssors Tetrafluoroethane ( CF3CH2F from! Energy to produce Cold a trademark registered by E.I cooling effect ) thus, often! In small applications like home refrigerators and small capacity AC ’ s for! And Diploma Engineering students of the vapour is cooled and enriched by ammonia easily! Like home refrigerators and small capacity AC ’ s also available cheap required expend! Point than the normal operating conditions vapour c ) 0.5 ( d -77.7°C... Edit Practice Test: Question Set - 07 input to absorption systems is in the vapour cycle... Montreal Protocol for depleting the ozone MCQ Q & a ; Contact Us family of HFC.. Capillary tube c. either throttling valve b. capillary tube the absorber-generator assembly are types of (! Is very useful at partial and full load ) compressor, chlorine, or.! Solution, which is the process carried out in generator of vapour absorption system. Banned from production by 1996 under the Montreal Protocol for depleting the ozone refrigeration ; MCQ &! Detailed Explanation for interview, entrance and competitive exams energy driven systems hydrogen, chlorine, or.! Will be the value of C.O.P a reducing valve University exam REFRIGERATION-2 Most commonly used in chillers. Refrigerant absorbant solution, which is easily and cheaply available ammonia as it safe... 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