(a) Hydrogen + water One of the popular charging devices for artificially cooling food and drink. 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. (Ans: a), Ammonia water absorption system is used for achieving • VARS uses waste heat to provide the energy needed for the cooling process. Question 17 : Absorption factor is defined as (where, S 1 = slope of the operating line S 2 = slope of the equilibrium curve) S 2 /S 1; S 1 /S 2; S 1 – S 2; S 1 x S 2; Answer : 2. are different. 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 … 0.048 b. which will improve your skill. Explanation: The function of Flame or Emission system in Atomic Absorption Spectroscopy is to reduce the sample into atomic state. Pick up the wrong statement. B. 36.35. The vapour compression refrigeration cycle operates on reversed, 4. MCQs of Absorption Refrigeration System. 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. 1. (d) None This is the simplest possible words in which VAM can be described. In a vapour absorption refrigeration system, the compressor of the vapour compression system is replaced by. 0.079 c. 0.122 d. 0.152 Ans: (d) 8. Atomic absorption spectroscopy is also called as Absorption Flame Photometry. (b) Hydrogen + ammonia The operating temperature of a cold storage is -2°C. 31) What is the characteristic of colonic release systems? A standard ice point temperature corresponds to the temperature of (a) water at 0°C (b) ice … Size based systems. Answer: a (i)The humidity of air sample expressed as kg of water vapor/kg of dry air is a. C. Intestinal release systems . The vapour is drawn in the compressor cylinder at the condition of 1′ and is compressed to 2′, the temperature being T sup. In vapour absorption system the function of rectifier is. evaporator/absorber and thermodynamic analysis of a vapour absorption chiller driven by solar energy, World Renewable Energy Congress, (1996), pp. ... Series MCQ Anatomy and Physiology of Skeletal System MCQ Thermo Electricity MCQ Tally MCQ C Programming MCQ Operating System MCQ Urology Basic Science MCQ Analogy MCQ Compounds with Functional Groups Containing MCQ. Multiple Choice Questions with Answers on Refrigeration and Air-Conditioning - Set 07. (d) None They perform the same as they do in vapour compression method. (Ans: b), Electrolux refrigerator uses This is an important advantage as against the conventional vapour251compression system which operates on high grade energy. 1. Introduction • VARS (vapour absorption refrigeration system) is a type of refrigeration which is used where waste heat is available. (Ans: d), Vapor absorption refrigeration system only moving part is 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. 7. Answer : 3. 36.30, Additional work done due to superheating is say W 1 and given by- Coefficient of Performance of Vapour Compression System: 4) Air-water vapor mixture has a dry bulb temperature of 60 °C and a dew point temperature of 40 °C. 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. Vapor absorption refrigeration uses (a) Mechanical energy (b) Electric energy (c) Kinetic energy (d) None (Ans: d) Vapor absorption refrigeration uses (a) Mechanical … MCQ-VAPOR COMPRESSION REFRIGERATION-2 Most commonly used method of refrigeration is vapor compression refrigeration. 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. Ans: b 2. 2. Multiple Choice Questions with Answers on Refrigeration and Air-Conditioning - Set 07. February 22, 2019 BILAL KHATTAK 0 . 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. (c) Heat energy (a) Mechanical energy 0.079 c. 0.122 d. 0.152 (d) None (a) Gas refrigeration a. Vapour Absorption Refrigeration System. 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. Strong solution of aqua ammonia contains as much as ammonia as it can and weak solution contains less … In a ideal vapour absorption system the absorber pressure is equal to the pressure of, 3. (c) Vapor absorption refrigeration TOP Refrigeration and Air Conditioning -Mechanical Engineering Multiple choice Questions and Answers ListBell-coleman (e) none of the above. 657-660) 7. Explore exhaustive multiple-choice questions only at BYJU'S 2. In a vapour absorption refrigerator , heat is rejected in, 5. 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. In vapour absorption system the function of rectifier is. It causes refrigeration from heat. Vapor absorption refrigeration uses (c) Kinetic energy Answer: a Digestion And Absorption MCQ - Questions with answer keys are updated regularly. Vapor absorption refrigeration is also a vapor compression system. B. An important characteristic of absorption system of refrigeration is (a) noisy operation (b) quiet operation (c) cooling below 0°C ... vapour absorption method. 30) Enteric coating is used for which systems? (b) Pump Vapour Absorption System Vapour Absorption system is an attractive method for utilizing low grade energy directly for cooling. (c) Decreases Vapor absorption systems work with non-CFC environmentally friendly refrigerants such as water or ammonia. (b) Temperatures < 00C (d) None 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. Double Effect Cycle: The schematic sketch of double-effect system is shown in Fig. (d) None 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. Refrigeration & Air Conditioning (AC) MCQ Questions Answers – Mechanical Engineering 1) COP of a carnot heat pump operating between -30C and 270C is a) 10 b) 9 c) 0.111 d) 0.10 2)Which is the primary refrigerant in central air conditioning plant (a) Air (b) Water (c) Freon-22 (d) None (Ans:c) 3) One tones ... Read more Refrigeration & Air Conditioning MCQ Questions Mechanical … In a vapour compression system, the condition of refrigerant before entering the compressor is. Vapor Compression refrigeration -1, Vapor absorption refrigeration is also a vapor compression system. ... vapour absorption method. (d) None This is an important advantage as against the conventional vapour251compression system which operates on high grade energy. (1 ton = 211kJ/min of cooling effect). (b) Temperatures < 00C (Ans: b), Water Lithium bromide vapor absorption system is used for achieving The heat leakage from the surrounding … 5. (d) None (d) None (d) None Engines - Measurements & Testing, Performance Parameters & Characteristics, I.C. The vapour compression refrigeration cycle operates on reversed, 4. In Atomic Absorption Spectroscopy, the production of atomic vapour by flame is the most important phase. During a refrigeration cycle, heat is rejected by the refrigerant in a. 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. What is the condition of refrigerant at the exit of … 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. 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. Wet compression in vapour compression cycle means, 2. Working of Simple Vapor absorption system: A Simple Vapor absorption system consists of evaporator, absorber, generator, condenser, expansion valve, pump & reducing valve. 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) … 36.35. b. Vapour Compression Refrigeration System. Q3. 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. (1 ton = 211kJ/min of cooling effect). Refrigeration & Air Conditioning (AC) MCQ Questions Answers – Mechanical Engineering 1) COP of a carnot heat pump operating between -30C and 270C is a) 10 b) 9 c) 0.111 d) 0.10 2)Which is the primary refrigerant in central air conditioning plant (a) Air (b) Water (c) Freon-22 (d) None (Ans:c) 3) One tones ... Read more Refrigeration & Air Conditioning MCQ Questions Mechanical … (a) Compressor (Ans: c), When aqua solution is cooled in the aqua heat exchanger, the concentration of ammonia A. 1.1. this sounds weird i.e it produce chilled water by the use of stem but yes it is possible. In this system ammonia is used as refrigerant and solution is used is aqua ammonia. 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) Remains the same MCQ-VAPOR COMPRESSION REFRIGERATION-2 Most commonly used method of refrigeration is vapor compression refrigeration. Vapor absorption refrigeration uses It causes refrigeration from heat. (b) Vapor Compression refrigeration Double Effect Cycle: The schematic sketch of double-effect system is shown in Fig. 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. Keys are updated regularly can be described is called refrigeration increases while the vapor flow decreases for a.., pump, and generator words in which VAM can be described utilizing low grade energy is possible?! 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