Then, COP of both A and B > COP of Reversed Carnot Cycle. low compression ratio and relatively high volumetric efficiency. Evaporation. The other is the halide torch method used with fluorocarbons. What is the value of the COP of the vapour compression refrigeration system? 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Pick up the wrong statement. For an ideal vapor compression refrigeration system operating with R-22 at an evaporator temperature of -10°C and condensing at 30°C, find the following: the compressor suction and discharge pressures, enthalpies, and specific volumes; the condenser discharge pressure and enthalpy; the refrigeration COP; and the refrigerant mass flow rate and power requirement for a 10-ton refrigeration … Explanation: These are the two types of expansion devices. MCQ In vapor compression refrigeration system, at entrance to which component the working fluid is superheated vapor? c) large installations use air-cooled condenser Air cooling is used for freon compressors whereas water jacketing is adopted for cooling ammonia compressors. Vapour compression Cycle important Theory & Mcq || RGPV Online exam 2020 || Chapter-2 || RAC, 1. So for same heat transfer temperature difference will be high, The power required for the compressor in kw is, Explanation : Since power is required for compressor in refrigeration is in compression cycle (1-2), Hence, Power required = m (h2 -h1) = mo (h2 -hf). Found site related problem + Download crome browser for best view Don't use mini version (opera, uc browser etc.) c) (p1*p2)/(p1+p2) Which of the following is a type of expansion device? 7. So, COP R = Q C over W ref. Q22.The most widely used refrigerants are It improves the volumetric efficiency for the given pressure ratio.. A flash chamber is a device which separates liquid from vapors. The choice … A large percentage of compressor failures in low-temperature vapor-compression refrigeration system applications originate from overheating. Vapor-compression refrigeration systems operate by boiling a working fluid (the refrigerant) in the evaporator (4 → 1) at a relatively low pressure, extracting heat from a low-temperature source (such as the refrigerated space). Wet vapour. Comparison Between Disc Brake & Drum Brake, TOM, Mechanical Engineering, GATE, Refrigeration - Refrigeration and Air Conditioning, GATE, Mechanical Properties of Engineering Materials, What are the Types of Constrained Motion, TOM, Mechanical Engineering, GATE, Vapour Compression Systems, Refrigerants - MCQ Test 2, Vapour Compression Systems, Refrigerants - MCQ Test 1. The units of _____ and COP are the same. However, it is preferred in comfort air-conditioning. Wet compression is _____. Next . E). b. to reduce the mass of vapour formed during expansion process, c. to reduce vapour bubbles which obstruct the flow of liquid refrigerant. 3. The refrigerant, commonly used in vapour absorption refrigeration system, is. Choices. Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle? In a refrigeration cycle, the desired output is Q C, because the goal is to remove heat from the cold reservoir. Ribas et al. Module 6 Vapour Absorption Refrigeration System Lesson 22 … The correct sequence of vapour compression (VC), vapour absorption (VA) and steam ejector (SE) refrigeration cycles in increasing order of the COP is: The correct sequence of VC, VA and SE in increasing order of COP is VA, SE and VC, the Value being of the order of 0.3 to 0.4 0.5 to 0.8 and 4 to 5 respectively. Adsorption refrigeration is regarded as because it can be driven by low-grade heat and use natural refrigerants. Only liquid is then passed to evaporator and the vapors will be passed to the compressor directly. kinematic viscosity work temperature none of these Answer : 4 Question 2 : … This test is Rated positive by 90% students preparing for Mechanical Engineering.This MCQ test is related to Mechanical Engineering syllabus, prepared by Mechanical Engineering teachers. Evaporator from one unit is used for cooling the condenser of the other unit. Q14. A short summary of this paper. Expansion. a) p1*p2 86-89 Lesson 20 Working and mathematical analysis of above systems 90-92 Lesson 21 Numericals on multi-evaporation and compression systems 93-97 . Now, as per joule-thomson expansion for some specific temp range as pressure reduce temp will also reduce. b) larger units The latter uses an absorber while former uses a generator. Only liquid is then passed to evaporator and the vapors will be passed to the compressor directly. (A) improve overall heat transfer coefficient Desirable Properties of an ideal Refrigerant. What is the main reason behind subcooling of liquid refrigerant at the condenser outlet in vapour compression refrigeration system? Vapour-compression refrigeration or vapor-compression refrigeration system (VCRS), 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. When the exhaust pressure is higher than 2.5MAPa, two compressors can be adopted, which are driven by two main motors. 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. Of accumulation of lubricating oil in condenser. students definitely take this Vapour Compression Systems, Refrigerants - MCQ Test 2 exercise for a better result in the exam. c) arcton A compound pressurized recirculation refrigeration system having a shell type vessel providing a combination flash liquid cooler and first stage gas cooler is disclosed in Ross U.S. Pat. However, calculated in cm³, the charge would be roughly the same liquid volume in the system. Discuss multi-stage vapour compression refrigeration systems with flash gas removal and intercooling (Section 12.4) 6. The required input is the work input, W ref. 3. Q1. However, system chemistry and heat exchangers are complex, refrigerant compositions are sensitive, and compressor displace-ment is large. In this example, compressor 1 empties into the compressor suction в„– 2. Moisture should be removed from refrigerants to avoid. Q1. The mass flow rate is 0.5 kg/s. Refrigeration and Air Conditioning Mcqs for Preparation of Fpsc, Nts, Kppsc, Ppsc, and other test. Q21.The intercooler pressure is given by IF YOU THINK THAT ABOVE POSTED MCQ IS WRONG. Chapter because the MCQ Test has Questions of Mechanical compression refrigeration system with than... 84-85 Lesson 19 Comparison of compound compression with intercooling question is the evaporator outlet goal to. To approximate following h.p a small reciprocating compressor Q C, because the comes...: DRDO, ISRO, Interview the exhaust pressure is higher than 2.5MAPa two! You for every Mechanical Engineering helps YOU for every Mechanical Engineering helps YOU for every Mechanical Engineering and GATE.... 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