Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle? Pick up the wrong statement. that was commonly used in centrifugal chillers and before the 1970's it was used as a propellant for aerosols. (adsbygoogle = window.adsbygoogle || []).push({}); Your email address will not be published. Q4. Correct Answer.  In ammonia-water absorption refrigeration system, ammonia is used as the refrigerant, which is easily and cheaply available. Thus, the function of a compressor is done by absorber, a generator, pump and reducing valve. Thus, Freons are types of chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), and related compounds. 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. Answer: a Answer: c Q4. 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. b. capillary tube. a) refrigerant a cooling substance, as ice or solid carbon dioxide, used in a refrigerator, ), and Natural Refrigerants. d) none of the mentioned 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 = … a) true 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. • Corrosive in nature. 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 a vapour absorption refrigeration system, the compressor of the vapour compression system is replaced by. Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. Working of Simple Vapor absorption system: A Simple Vapor absorption system consists of evaporator, absorber, generator, condenser, expansion valve, pump & reducing valve. d) all of the mentioned R134a is also known as Tetrafluoroethane (CF3CH2F) from the family of HFC refrigerant. Correct Answer. Cooling capacity is the cooling produced per minute. The compressor in the vapour compression system id replaced by. a) to increase the amount of water vapour in ammonia vapour (a) Air. a) refrigerant ... With an Ozone Depleting Potential (ODP) of 0 and a Global Warming Potential (GWP) of 1, R744 (CO2) is a natural refrigerant. a) water is the refrigerant and ammonia is the absorbent The boiling point of ammonia is (A) -10.5°C (B) -30°C (C) -33.3°C (D) -77.7°C. ANSWER: c. either throttling valve or capillary tube . Refrigeration & Air-Conditioning MCQ Question with Answer Refrigeration & Air-Conditioning MCQ with detailed explanation for interview, entrance and competitive exams. b) high Q7. During a refrigeration cycle, heat is rejected by the refrigerant in a. 5. why is an analyser-rectifier combination is used in absorption refrigeration cycle? a) absorbent These short objective type questions with answers are very important for competitive exams. Explanation: The saturation temperature of water is higher than ammonia at any given pressure. grade CO2, used as a replacement for R134a and R404A in ultra-low, low and medium temperature. (c) Freon-22. View Answer. 2. Q7. The heat flow in the system at generator, and work is supplied to pump. 2. Explanation: This is done to prevent the blocking of expansion valve because of frozen ice. The COP of absorption refrigeration system is Explanation are … ... 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. (even for above 1000 TR)  Can be operated at designed C.O.P’s or even at part loads by varying generator temperature. 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. d) none of the mentioned c) to eliminate the water vapour from ammonia vapour or 3 fluid refrigeration? In this system ammonia is used as refrigerant and solution is used is aqua ammonia. b) higher, richer Answer: b ANSWER: c. an absorber-generator. The wet bulb depression is zero when relative humidity equals, 6. Refrigeration and Air Conditioning – Mechanical Engineering Multiple Choice Questions : 1. d. none of the above. Vapour Compression Refrigeration Cycle - MCQs with Answers Q1. Answer: c Answer: b 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. Q9. d) lower, richer in the area of centrifugal, rotary screw, scroll and reciprocating compresssors. Nov 17,2020 - Refrigeration Cycles And Systems - 3 | 30 Questions MCQ Test has questions of Mechanical Engineering preparation. MCQ-VAPOR COMPRESSION REFRIGERATION-2 Most commonly used method of refrigeration is vapor compression refrigeration. If the cycle direction be reversed, what will be the value of C.O.P. 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. 3. 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. It is now being used as a replacement for. These short solved questions or quizzes are provided by Gkseries. • Maintenance cost is low as because of absence of moving part. 10. 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. View Answer. 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. c) both ammonia and water can be used as refrigerant or absorbent Lithium Bromide absorption refrigeration system? The most common refrigerants include Chlorofluorocarbons (CFCs), Hydrochlorofluorocarbons (HCFCs), Hydrofluorocarbons (HFCs), and Natural Refrigerants. 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. 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. R744 (CO2) is refrigerant grade CO2, used as a replacement for R134a and R404A in ultra-low, low and medium temperature refrigeration applications. What is an advantage using analyser-rectifier in aqua-ammonia absorption system? In absorption refrigeration cycle, which of the following is used? Q1. 2. Wet compression in vapour compression cycle means, 2. applications. agent, as a drug. 1. Ans: a 6. 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. 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. Wet compression is _____. View Answer.  Can work only with thermal energy as an input. b) water vapour The simple vapor compressor system is used where there is scarcity of Electricity and it is very useful at partial and full load. control requirements favor absorption system. which will improve your skill. d) none of the mentioned, https://www.youtube.com/watch?v=g754W6-_Zk0&list=PLelAq9xzEDXCZwXnq6z6f04dEhRqEWSmZ. The low temperature, low pressure vapour at state B is compressed by the compressor. 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. 2. Strong solution of aqua ammonia contains as much as ammonia as it can and weak solution contains less ammonia. 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. • Initial cost is high. View Answer. The weak solution containing very little ammonia is spread in absorber.  Can be built for huge working capacities. b) false MCQ-VAPOR ABSORPTION REFRIGERATION. ... 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. 4. MCQ Questions for RGPV Online exam 2020. Find out latest Multiple Choice Questions with Answers on Refrigeration and Air Conditioning for exam preparation. 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. b) ammonia is the refrigerant and water is the absorbent Water is used as a ____ in air conditioning units. In lithium bromide system, water is used as the refrigerant, which is also available cheap. TOP Refrigeration and Air Conditioning -Mechanical Engineering Multiple choice Questions and Answers ListBell-coleman (e) none of the above. b) refrigerant Q5. Explanation: In this, water is the refrigerant and solution of lithium bromide in water is the absorbent. 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. c. either throttling valve or capillary tube . 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. What is the value of the … In the aqua-ammonia absorption system, Correct Answer. 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. What is the condition of refrigerant at the exit of evaporator … Pick up the wrong statement. MCQ important questions || Rgpv online Exams, 1. In a vapour absorption refrigerator , heat is rejected in, 5. • In the absorption refrigeration system no refrigerant produces the greenhouse effect, so their use won’t be stopped in future. 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. a) higher, less View Answer. c) both of the mentioned Which of the following condenses first? a. throttling valve. -114 used in centrifugal chillers and high-ambient cooling applications, including overhead cranes. In absorption system, compressor in vapour compression cycle is replaced by absorber-generator assembly. 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. However, the COP of actual VARS will be much less than that of … MCQs of Absorption Refrigeration System. Q6. 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. • Low working pressure. Which is the primary refrigerant in central air conditioning plant. 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, ***************************************************************. Ammonia vapors coming out of evaporator are drawn in absorber. View Answer. The name Freon is a trademark registered by E.I. 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. Q2. Explanation: The absorber-generator assembly involves less mechanical work. 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. Advantages of using Vapor – Absorption Refrigeration System  No moving part except pump-motor, which is comparatively smaller than compressor system. Required fields are marked *. Steam Jet refrigeration system ? Ans: d 5. b) absorbent Answer: a c) both of the mentioned Working of Simple Vapor absorption system: A Simple Vapor absorption system consists of evaporator, absorber, generator, condenser, expansion valve, pump & reducing valve. This set of Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on “Absorption Refrigeration Cycle”. 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. Efficiency of a Carnot engine is given as 80%. 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. Q3. Contents. Explanation: The reason is that water cannot be cooled below 0 degree Celsius. View Answer, Answer: a The vapour absorption refrigeration system is, a. more noisy than the vapour compression refrigeration system, b. more silent than the vapour compression refrigeration system, c. equally noisy as the vapour compression refrigeration system, ANSWER: b. more silent than the vapour compression refrigeration system, Q11. a) ammonia vapour 8. Vapour Absorption Refrigeration Systems (VARS) belong to the class of vapour cycles similar to vapour compression refrigeration systems. In this system, the working substance is a refrigerant like NH 3, R-11, R-12.. 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 Ans: b. The released vapor is passed to condenser and weak solution to absorber through a reducing valve. Define refrigerants. Wet compression is _____. Electrolux refrigeration system? Pick up the wrong statement. d) none of the mentioned It is a low-pressure. 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. This strong solution from absorber is pumped into generator. a) ammonia vapour is absorbed in water Freons or halocarbons are synthetically produced. View Answer. c) equal to that of vapour compression refrigeration system Q3. d) none of the mentioned In a ideal vapour absorption system the absorber pressure is equal to the pressure of, 3. is also known as Tetrafluoroethane (CF3CH2F) from the family of HFC, . Q10. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. c. low pressure strong vapour mixture of ammonia and water, d. high pressure strong vapour mixture of ammonia and water. Ans: b 2. Friday, May 27, 2016. Properties of refrigerants? ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) 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. Below 0 Degree Celsius answer: d Explanation: the saturation temperature of water is used as refrigerant and is! ; expansion valve ; 2 } ) ; Your email address will not be published low and medium temperature system. 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