Properties of refrigerants? Working of Simple Vapor absorption system: A Simple Vapor absorption system consists of evaporator, absorber, generator, condenser, expansion valve, pump & reducing valve. During a refrigeration cycle, heat is rejected by the refrigerant in a. 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. Correct Answer. applications. 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  Space and Auto. 8. 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. Next . In a vapour absorption refrigerator , heat is rejected in, 5. 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. Pick up the wrong statement. Explanation: When passing through analyser, the vapour is cooled and enriched by ammonia. 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. Advantages of using Vapor – Absorption Refrigeration System  No moving part except pump-motor, which is comparatively smaller than compressor system. or 3 fluid refrigeration? Ans: b. Vapour Compression Refrigeration Cycle - MCQs with Answers Q1. Answer: c R134a is also known as Tetrafluoroethane (CF3CH2F) from the family of HFC refrigerant. In this system, the working substance is a refrigerant like NH 3, R-11, R-12.. Answer: a What is an advantage using analyser-rectifier in aqua-ammonia absorption system? 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. which will improve your skill. b) boiling point of ammonia is more than that of water In absorption system, compressor in vapour compression cycle is replaced by absorber-generator assembly. Q7. 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. Refrigeration and Air Conditioning Multiple Choice Questions :-1. 3. In absorption refrigeration cycle, which of the following is used? If the cycle direction be reversed, what will be the value of C.O.P. a) refrigerant a) to increase the amount of water vapour in ammonia vapour 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. 36.20. View Answer. Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle? Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. Find out latest Multiple Choice Questions with Answers on Refrigeration and Air Conditioning for exam preparation. 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. (A) 1.25 (B) 0.8 (C) 0.5 (D) 0.25. b) ammonia is the refrigerant and water is the absorbent 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. b) false 1. • 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) true Thus, the function of a compressor is done by absorber, a generator, pump and reducing valve. Q2. 2. 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. The released vapor is passed to condenser and weak solution to absorber through a reducing valve. The low temperature, low pressure vapour at state B is compressed by the compressor. However means of compression. Answer: b b) high 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. a cooling substance, as ice or solid carbon dioxide, used in a refrigerator, ), and Natural Refrigerants. • Initial cost is high. The classification also depends on their chemical elements chlorine (Cl), hydrogen (H), carbon (C), and Florine (F). MCQ Questions for RGPV Online exam 2020. in the area of centrifugal, rotary screw, scroll and reciprocating compresssors. Q1. Cooling capacity is the cooling produced per minute. a. throttling valve b. capillary tube c. either throttling valve or capillary tube d. none of the above View Answer / Hide Answer. Wet compression is _____. ANSWER: c. either throttling valve or capillary tube. 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) both of the mentioned In lithium bromide system, water is used as the refrigerant, which is also available cheap. Correct Answer. Strong solution of aqua ammonia contains as much as ammonia as it can and weak solution contains less ammonia. a) true Answer: b Q3. c) lower, less that was commonly used in centrifugal chillers and before the 1970's it was used as a propellant for aerosols. a) refrigerant It causes refrigeration from heat. 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 … Q7. Explanation are … Q6. Vapor absorption refrigeration system is usually applied in small applications like home refrigerators and Small capacity AC’s. What is the condition of refrigerant at the exit of evaporator …  Can work only with thermal energy as an input. control requirements favor absorption system. 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.

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