MCQ-VAPOR COMPRESSION REFRIGERATION-2 Most commonly used method of refrigeration is vapor compression refrigeration. Wet compression in vapour compression cycle means, 2. 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. 1. d) all of the mentioned 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 is measured in tons of refrigeration. 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. 4. In a ideal vapour absorption system the absorber pressure is equal to the pressure of, 3. • The load variations does not effect the performance of a vapour absorption system. 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 Q4. Multiple choice questions on Refrigeration and air conditioning - Set 13 MCQ Refrigeration Edit Practice Test: Question Set - 13. b) boiling point of ammonia is more than that of water Lithium bromide-water vapour is another absorption refrigeration system. 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 … 1. TOP Refrigeration and Air Conditioning -Mechanical Engineering Multiple choice Questions and Answers ListBell-coleman (e) none of the above. Answer: a February 22, 2019 BILAL KHATTAK 0 . • 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. d) none of the mentioned 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. Expression for mass of motive steam required ? ADVERTISEMENTS: (b) Condenser (c) Expansion valve (d) Evaporator . Q2. Which is the primary refrigerant in central air conditioning plant. 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. Freon group of refrigerants are (A) Inflammable (B) Toxic (C) Non-inflammable and toxic (D) Nontoxic and non-inflammable. 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. Explanation: This is the basic absorption refrigeration cycle. View Answer. A simple vapour compression system of refrigeration consists of the equipment as follows: (a) Compressor . Go To Download Page Close. -114 used in centrifugal chillers and high-ambient cooling applications, including overhead cranes. Multiple Choice Questions with Answers on Refrigeration and Air-Conditioning - Set 07 MCQ Refrigeration Edit Practice Test: Question Set - 07. Ammonia vapors coming out of evaporator are drawn in absorber. In lithium bromide system, water is used as the refrigerant, which is also available cheap. Refrigeration and Air Conditioning Multiple Choice Questions :-1. Vapor absorption refrigeration system is usually applied in small applications like home refrigerators and Small capacity AC’s. d) none of the mentioned a) absorbent MCQ important questions || Rgpv online Exams, 1. 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. The name Freon is a trademark registered by E.I. View Answer. 2. ANSWER: c. either throttling valve or capillary tube. 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. Which of the following condenses first? (b) Water. In this system, the working substance is a refrigerant like NH 3, R-11, R-12.. Define refrigerants. Advantages of using Vapor – Absorption Refrigeration System  No moving part except pump-motor, which is comparatively smaller than compressor system. 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. a) true The boiling point of ammonia is (A) -10.5°C (B) -30°C (C) -33.3°C (D) -77.7°C. 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. • Low working pressure. Explanation: The absorber-generator assembly involves less mechanical work. 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. 8. Q6. These short solved questions or quizzes are provided by Gkseries. Lithium Bromide absorption refrigeration system? The released vapor is passed to condenser and weak solution to absorber through a reducing valve. ANSWER: c. either throttling valve or capillary tube . Q10. 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