Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. MCQ ~ Vapour Compression Refrigeration System 1. Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle? Steam Jet refrigeration system ? 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. Q1. 10. 2. c) both of the mentioned Ans: a 6. The compressor in the vapour compression system id replaced by. Explanation: This is done to prevent the blocking of expansion valve because of frozen ice. Expression for mass of motive steam required ? d. none of the above. b) water vapour d) all 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. Pick up the wrong statement. a liquid capable of vaporizing at a low temperature, as ammonia, used in mechanical, .  Can work only with thermal energy as an input. in the area of centrifugal, rotary screw, scroll and reciprocating compresssors. are different. (even for above 1000 TR)  Can be operated at designed C.O.P’s or even at part loads by varying generator temperature. What is the value of the … Explanation: The saturation temperature of water is higher than ammonia at any given pressure. 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. 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 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. Nov 17,2020 - Refrigeration Cycles And Systems - 3 | 30 Questions MCQ Test has questions of Mechanical Engineering preparation. It causes refrigeration from heat. 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 Freon group of refrigerants are (A) Inflammable (B) Toxic (C) Non-inflammable and toxic (D) Nontoxic and non-inflammable. Freons or halocarbons are synthetically produced. Vapor absorption refrigeration system is usually applied in small applications like home refrigerators and Small capacity AC’s. ANSWER: c. either throttling valve or capillary tube . Define refrigerants. View Answer. It is safe for normal handling as it is non-toxic, non-flammable and non-corrosive. 3. Q7. Vapor absorption refrigeration is also a vapor compression system. 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. Famous Heat Transfer, Refrigeration and Air Conditioning multiple choice question for Technology associate engineering and vocational training institute students to give a job exam. 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. The wet bulb depression is zero when relative humidity equals, 6. Refrigeration is measured in tons of refrigeration. 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. View Answer. d) none of the mentioned, https://www.youtube.com/watch?v=g754W6-_Zk0&list=PLelAq9xzEDXCZwXnq6z6f04dEhRqEWSmZ. Answer: c a) true Required fields are marked *. Go To Download Page Close. c) both ammonia and water can be used as refrigerant or absorbent In absorption refrigeration cycle, which of the following is used? R134a is also known as Tetrafluoroethane (CF3CH2F) from the family of HFC refrigerant. a) to increase the amount of water vapour in ammonia vapour • The load variations does not effect the performance of a vapour absorption 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.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. • In the absorption refrigeration system no refrigerant produces the greenhouse effect, so their use won’t be stopped in future. Electrolux refrigeration system? Answer: b Free download in PDF Refrigeration and Air Conditioning Multiple Choice Questions and Answers for competitive exams. MCQ-VAPOR COMPRESSION REFRIGERATION-2 Most commonly used method of refrigeration is vapor compression refrigeration. Refrigerants should have low freezing point than the normal operating conditions. a cooling substance, as ice or solid carbon dioxide, used in a refrigerator, ), and Natural Refrigerants. In absorption refrigeration cycle, which of the following is used? Explanation: In this, water is the refrigerant and solution of lithium bromide in water is the absorbent. 36.20. Hence these systems are also called as heat operated or thermal energy driven systems. Ans: b. ... Because the cycle works at very low pressure, the volumetric cooling capacity of water vapor is very low. (c) Freon-22. 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. ANSWER: c. either throttling valve or capillary tube. What is the process carried out in generator of vapour absorption refrigeration cycle? Pick up the wrong statement. Strong solution of aqua ammonia contains as much as ammonia as it can and weak solution contains less ammonia. Efficiency of a Carnot engine is given as 80%. Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle? ADVERTISEMENTS: (b) Condenser (c) Expansion valve (d) Evaporator . MCQ important questions || Rgpv online Exams, 1. d) none of the mentioned Ans: d 5. ... With an Ozone Depleting Potential (ODP) of 0 and a Global Warming Potential (GWP) of 1, R744 (CO2) is a natural refrigerant. 6. 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. 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. Correct Answer. It is now being used as a replacement for. View Answer. ... 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