A. 25(5), (1998), pp. The total pressure is 101.3 kPa and the vapor pressures of water at 40°C and 60°C are 7.30 kPa and 19.91 kPa, respectively. (a) Potential energy https://www.mesubjects.net/wp-admin/post.php?post=4190&action=edit         MCQ Cascade Refrigeration, https://www.mesubjects.net/wp-admin/post.php?post=4105&action=edit       Q.A. A. Mucoadhesive systems . Remaining cycle processes remain unchanged as shown. This is an important advantage as against the conventional vapour251compression system which operates on high grade energy. Wet compression in vapour compression cycle means, 2. B. In this system ammonia is used as refrigerant and solution is used is aqua ammonia. The wet bulb depression is zero when relative humidity equals, 6. Transfer function of a system can used to study its: a) Steady state behavior b) Transient behavior c) Both (a) and (b) d) None of these. (c) Turbine (a) Remains the same (a) Temperatures > 00C (Ans: b), Electrolux refrigerator uses ... An important characteristic of absorption system … This review data can serve as a source of reference in selecting a suitable solar collector with available fluid pair and configuration or vice-versa. Answer: Option C. 20. (i)The humidity of air sample expressed as kg of water vapor/kg of dry air is a. Expansion valve. 0.079 c. 0.122 d. 0.152 The vapor absorption refrigeration system is a best alternative to vapor compression cycle despite of having low coefficient of performance compared to the compression cycle because of its eco-friendly aspect and heat operated nature. In this system ammonia is used as refrigerant and solution is used is aqua ammonia. Vapor absorption systems work with non-CFC environmentally friendly refrigerants such as water or ammonia. Explore exhaustive multiple-choice questions only at BYJU'S This review data can serve as a source of reference in selecting a suitable solar collector with available fluid pair and configuration or vice-versa. (Ans: c) The total pressure is 101.3 kPa and the vapor pressures of water at 40°C and 60°C are 7.30 kPa and 19.91 kPa, respectively. Vapor absorption refrigeration uses For various water based vapour absorption systems, the possible range of generator operating temperature requirements and its corresponding attainable COP values has been reviewed and tabulated. B. Automatic control system in which output is a variable is called: a) Closed loop system b) Servomechanism c) Automatic regulating system d) Process control system. 36.35. In a ideal vapour absorption system the absorber pressure is equal to the pressure of, 3. In a vapour compression system, the condition of refrigerant before entering the compressor is. MCQ-VAPOR COMPRESSION REFRIGERATION-2 Most commonly used method of refrigeration is vapor compression refrigeration. (Ans: c), When aqua solution is cooled in the aqua heat exchanger, the concentration of ammonia Vapour Absorption Refrigeration system: A Vapour absorption system utilizes the low-grade form of heat energy to produce Cold. Vapor absorption machine (VAM) also known as vapor absorption chiller is to produce chilled water using heat source such as a steam hot water and fuel gas. (c) Decreases (a) Mechanical energy 1. Vapor absorption refrigeration is also a vapor compression system. Explore exhaustive multiple-choice questions only at BYJU'S a. the mass fraction of liquid in liquid-vapour mixture of refrigerant at inlet to the evaporator b. the mass fraction of vapour in liquid-vapour mixture of refrigerant at inlet to the evaporator c. the mass of vapour actually compressed to the mass of vapour should have compressed ideally d. none of the above View Answer / Hide Answer Absorption system normally uses the following refrigerant (a) Freon-11 (b) Freon-22 (c) C02 (d) S02 (e) ammonia. (a) Gas refrigeration Evaporator. (Ans: a), Ammonia water absorption system is used for achieving Refrigeration is measured in tons of refrigeration. In system A vapour are superheated by 10°C in the evaporator while in system B vapour are superheated by 10°C in a liquid vapour regenerative heat exchanger… 7. This contains 25 Multiple Choice Questions for Mechanical Engineering Test: RAC Practice (Level -I)- 1 (mcq) to study with solutions a complete question bank. 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. February 22, 2019 BILAL KHATTAK 0 . (a) Hydrogen + water (1 ton = 211kJ/min of cooling effect). ... An important characteristic of absorption system … One of the popular charging devices for artificially cooling food and drink. 1. 5. Cooling capacity is the cooling produced per minute. Cooling capacity is the cooling produced per minute. 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 Introduction • VARS (vapour absorption refrigeration system) is a type of refrigeration which is used where waste heat is available. (c) Kinetic energy A standard ice point temperature corresponds to the temperature of (a) water at 0°C (b) ice … MCQ-VAPOR ABSORPTION REFRIGERATION. (c) Kinetic energy The condition of refrigerant after passing through the expansion or throttle valve, in a vapour compression system is (A) High pressure saturated liquid (B) Wet vapour (C) Very wet vapour (D) Dry vapour. This contains 25 Multiple Choice Questions for Mechanical Engineering Test: RAC Practice (Level -I)- 1 (mcq) to study with solutions a complete question bank. (Ans: d), Vapor absorption refrigeration uses Absorption system is slightly different from compression system. Answer : 3. In a vapour absorption refrigerator , heat is rejected in, 5. This is an important advantage as against the conventional vapour251compression system which operates on high grade energy. The heat leakage from the surrounding … liquid flow increases while the vapor flow decreases for a system. One of the purposes of sub-cooling the liquid refrigerant is to (a) reduce compressor overheating (b) reduce compressor discharge temperature (c) increase cooling effect (d) ensure that only liquid and not the vapour enters the expansion (throttling) … Vapour Absorption System Vapour Absorption system is an attractive method for utilizing low grade energy directly for cooling. The operating temperature of a cold storage is -2°C. ... vapour absorption method. In this system ammonia is used as refrigerant and solution is used is aqua ammonia. Multiple choice questions on Refrigeration and air conditioning - Set 13 ... Vapour absorption cycle (C) Air refrigeration cycle (D) None ... 9. The compressor of the Vapour Compression Refrigeration System is replaced by the use of absorber, pump, and generator. In Atomic Absorption Spectroscopy, the production of atomic vapour by flame is the most important phase. The condition of refrigerant after passing through the expansion or throttle valve, in a vapour compression system is (A) High pressure saturated liquid (B) Wet vapour (C) Very wet vapour (D) Dry vapour. 1. (a) Mechanical energy • It consumes less power compared to compression system hence useful where cost of electricity is high. The wet bulb depression is zero when relative humidity equals, 6. (d) None (b) Temperatures < 00C Vapor absorption refrigeration uses 1.1. A simple and practical absorption system using ammonia as refrigerant and water as absorbent described in the previous articles is an example of single-effect cycle system for vapour absorption refrigeration system. Multiple Choice Questions with Answers on Refrigeration and Air-Conditioning - Set 07. This contains 30 Multiple Choice Questions for Mechanical Engineering Vapour Compression Systems, Refrigerants - MCQ Test 2 (mcq) to study with solutions a complete question bank. 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 C. Intestinal release systems . Chapter-3 Vapour Absorption Refrigeration system (Coming Soon ) SSC-JE & RRB-JE(Mechanical) Full … © Copyright 2016. (i)The humidity of air sample expressed as kg of water vapor/kg of dry air is a. • Solar refrigeration system is based on VARS. ANSWER: c. an absorber-generator. Compressor. In vapour absorption system the function of rectifier is. 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. Answer: Option C. 20. 0.048 b. which will improve your skill. Size based systems. (Ans: a), There is change of phase of refrigerant in (c)  = 00C this sounds weird i.e it produce chilled water by the use of stem but yes it is possible. ANSWER: b. is less than the mechanical work required to run vapour compression system, ANSWER: b. strong solution of ammonia in water is heated, ANSWER: b. weak solution is taken in and strong solution is given out, ANSWER: b. to remove water vapour out from ammonia after generator, ANSWER: b. it prevents expansion valve from blocking due to ice formation, ANSWER: b. lower than the saturation temperature of water, ANSWER: b. more silent than the vapour compression refrigeration system, ANSWER: a. lower than the COP of the vapour compression refrigeration system. Ans: (c) 7. 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. Ans: d 5. ozone depletion. 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 … 31) What is the characteristic of colonic release systems? Answer: a Condenser. Ans: b 2. (c) Hydrogen + water + Ammonia 36.35. For various water based vapour absorption systems, the possible range of generator operating temperature requirements and its corresponding attainable COP values has been reviewed and tabulated. (1 ton = 211kJ/min of cooling effect). 711-721) 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. Vapor absorption refrigeration uses (a) Mechanical energy (b) Electric energy (c) Kinetic energy (d) None (Ans: d) Vapor absorption refrigeration uses (a) Mechanical … The vapour absorption system consists of a condenser, an expansion valve and an evaporator. Next . Multiple Choice Questions with Answers on Refrigeration and Air-Conditioning - Set 07. D. Buccal drug delivery systems . • VARS uses waste heat to provide the energy needed for the cooling process. The vapour compression refrigeration cycle operates on reversed, 4. 36.30, Additional work done due to superheating is say W 1 and given by- Coefficient of Performance of Vapour Compression System: (b) Electric energy a. Vapour Absorption Refrigeration System. 4) Air-water vapor mixture has a dry bulb temperature of 60 °C and a dew point temperature of 40 °C. (c) Vapor absorption Refrigeration A simple and practical absorption system using ammonia as refrigerant and water as absorbent described in the previous articles is an example of single-effect cycle system for vapour absorption refrigeration system. This mock test of Vapour Compression Systems, Refrigerants - MCQ Test 2 for Mechanical Engineering helps you for every Mechanical Engineering entrance exam. Whereas the VCR system needs work energy to produce cold which is a high-grade form of energy and expensive to produce. Strong solution of aqua ammonia contains as much as ammonia as it can and weak solution contains less … Double Effect Cycle: The schematic sketch of double-effect system is shown in Fig. Vapor Compression Refrigeration System | Basic, Working, Parts Of System, Advantages, and Disadvantages Introduction: 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. (d) None Vapor Compression refrigeration -1, Vapor absorption refrigeration is also a vapor compression system. 19. Atomic absorption spectroscopy is also called as Absorption Flame Photometry. In Atomic Absorption Spectroscopy, the production of atomic vapour by flame is the most important phase. • VARS uses waste heat to provide the energy needed for the cooling process. 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. www.gtu-mcq.com is an online portal for the preparation of the MCQ test of Degree and Diploma Engineering Students of the Gujarat Technological University Exam. 2. (b) Vapor Compression refrigeration Engines - Measurements & Testing, Performance Parameters & Characteristics, I.C. (d) None Thermodynamics - Refrigeration, Psychrometry, Steam Generators, Gas Cycle Refrigeration - MCQs with Answers, Vapour Absorption Refrigeration System - MCQs with Answers, Vapour Compression Refrigeration Cycle - MCQs with Answers, I.C. 19. (Ans: c), The ratio of boiling point of refrigerant to the boiling point of absorbent should be, COP of a vapor absorption refrigeration is, (a) in a ammonia water vapor absorption refrigeration system, (b) Water lithium bromide vapor absorption refrigeration system, Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window). Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. MCQ No - 1. MCQs of Absorption Refrigeration System. • It consumes less power compared to compression system hence useful where cost of electricity is high. Referring to Fig. In vapour absorption system the function of rectifier is. ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) (a) Compressor In addition to these, this system has an absorber, a heat exchanger, an analyser and a rectifier. 0.048 b. b. Vapour Compression Refrigeration System. 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