Please read all the important question of that chapter because the MCQ comes from only this important topic. (B) using water colder than the main circulating water b) sqrt(p1*p2) a) freon Name, multistage, refers to any of the refrigeration system with more than one stage of compression. 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. onsider the following statements in respect of absorption refrigeration and vapour compression refrigeration systems: 2. What is the result of superheating of vapour at the evaporator outlet? MCQ of RAC (Refrigeration … Desirable Properties of an ideal Refrigerant. Q9. 4. We also offer a full lineup of environmentally-friendly compressors that use natural refrigerants. The liquid pump alone replaces compressor of the latter. Air-Conditioning and Refrigeration. MCQ No - 1. As fluid flow through capillary its velocity increase as per continuity eqation (AV=const).hence conversion of pressure energy into kinetic energy takes place. The multi stage compression as compared to single stage compression..... A. Subject: Refrigeration and Air Conditioning 1. This arrangement is adopted for very high compression ratio to avoid difficulties occurred in single stage compressor. Since the rapid increasing demand on cooling, green refrigeration technology is urgent. Which of the above statements are correct? Q23.1. Ans: a. The heat required to melt 1 tonne of ice in 12 hours is equivalent to. Answer: b c) 1 – C + C(p2/p1)^(1/n) Of accumulation of lubricating oil in condenser. 2. Ans: b. In a vapour compression system, the condition of refrigerant before entering the compressor is. 1 1 0 8. MCQs of Vapour Compression System. For a heat pump working on vapour compression cycle, enthalpy values of the working fluid at the end of heat addition process, at the end of compression process, at the end of heat rejection process, and at the end of isenthalpic expansion process are 195 kJ/kg, 210 kJ/kg, and 90 kJ/kg respectively. Applied Mechanics and Design. Discuss the use of flash tank for intercooling only (Section 12.6) At the end of the lesson, the student should be able to: 1. Expansion. 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. b) 1 – C – C(p2/p1)^(1/n) Improves volumetric efficiency for the given pressure ratio B. 5.8. Multiple Choice Questions (MCQ) and Answers on Chemical Engineering Thermodynamics Question 1 : The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. 2. 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. Choices. 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. b) genetron With the help of 4BEngineers, students can avail online coaching through video lecture at an unimaginably affordable cost, access the coaching content from renowned teaching experts, and be one on one with their personal favorite coach. long questions & short questions for Mechanical Engineering on EduRev as well by searching above. Q8. Q24. Mechanical Engineering MCQ Question Papers: DRDO, ISRO, Interview . 1. So, During the throttling process, heat absorption capacity at a cons. Our compressors leverage thermal technology developed through years of experience to consistently provide high quality. Match List-I with List-II and select the correct answer using the codes given below the lists: Assertion (A): Freon-12 is odourless and its leakage cannot be easily detected. r. o. Q15. For premium access Login / Register. Which of the following refrigerants has the lowest boiling point? Answer: a Match List-I (Chemical formula of refrigerant) with List-II (Numerical Designation) and select the correct answer using the codes given below the lists: R(C – 1)(H + 1)F and Cl by balance and for inorganic refrigerant R(700 + Molecular weight). Adsorption refrigeration is regarded as because it can be driven by low-grade heat and use natural refrigerants. 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 unit. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. (A) improve overall heat transfer coefficient (1) reported that gas superheating may account for up to half of the thermodynamic losses in a small reciprocating compressor. This yields charges of approx. (D) all of the above, Q25.The process of undercooling is generally brought about by d) all of the mentioned View Answer. What is the use of multistage compression in vapour compression refrigeration system? Choice (4) Response; a. Condenser: b. a) using a single stage with high pressure ratio decreases volumetric efficiency Answer: b Download. Name the essential parts of … Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle? Compound a combination of two compressors with low compression ratios can provide a high compression ratio A single refrigerant is used in the system, and the two compressors share the compression task equally. Wet vapour. 3. Whereas icentropic expansion is also called Adiabatic expansion. Explanation: These are the two types of expansion devices. It improves the volumetric efficiency for the given pressure ratio.. A flash chamber is a device which separates liquid from vapors. Q13. Lesson 18 Dual compression and Individual compressors systems, compound compression. Module 6 Vapour Absorption Refrigeration System Lesson 22 … One reason for this could be the a] system is low on refrigerant b] high pressure cut out is improperly adjusted c] discharge valves are leaking slightly d] discharge valves are leaking excessively Q16.For an expansion device, which of the following is true? 4. This, between the condenser and evaporator is known as, Chapter-3 Vapour Absorption Refrigeration system (Coming Soon ). a. no liquid droplets will travel to the compressor, b. the compressor discharge temperature increases. Leave a Reply Cancel reply. This will reduce its temperature. Of low charge of refrigerant in the system. a) 1 + C + C(p2/p1)^(1/n) 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. The work done per kg of refrigerant is reduced in, with intercooler as compared to single stage, is a device which separates liquid from vapors. a) it can be air-cooled or water-cooled Wet compression is _____. Refrigeration and Air Conditioning, Mechanical Engineering Multiple Choice Questions / Objective type questions, MCQ's, with question and answers, download free PDF, Mechanical Engineering, Multiple Choice Questions, Objective type questions, Mechanical Engineering short notes, rapid fire notes, best theory Besides, refrigerant of mechanical compression refrigeration system can bring about global warming and ozone depletion issues. Refrigeration and air conditioning mcq questions converted 1. c) both of the mentioned Evaporation. Glomerula pressure in human kidney is: Throttling process can be done by capillary tube.Working fluid is flow through capillary tube. The highest temperature during the cycle, in a vapour compression system, occurs after. d) none of the mentioned This paper. Which of the following statement is true for a condenser? Q18. Q3. Refrigeration and Air Conditioning Multiple Choice Questions :-1. Compression. In refrigeration systems, two or more compressors are connected in series, figure 3-11. When the exhaust pressure is no higher than 2.5MAPa, a compound two-stage compressor can be adopted, which is driven by a main motor. 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 … Mechanical Engineering Handbook. MCQ In vapor compression refrigeration system, at entrance to which component the working fluid is superheated vapor? Answer: d View Answer. 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. ANSWER: b. throttle valve, Q12. (A) circulating more quantity of cooling water through the condenser a) small units 0. b) throttle valves 22 Full PDFs related to this paper. 5. Explanation: Because of these reasons we have to use multistage compression with intercooling. 1. 1. In vapor compression refrigeration system, refrigerant occurs as liquid between_____? Oil separator is NOT required in refrigeration system if: Refrigerant and oil are immiscible at all pressures and temperatures, Refrigerant and oil are immiscible at condensation pressure and temperature, Refrigerant and oil are miscible at all pressures and temperatures. Q14. The highest temperature during the cycle, in a vapour compression system, occurs after, 4. 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. The main components are shown in Fig. The choice … In the cascade system, two separate refrigerant system are interrelated. hence it is preferred over icentropic expansion. Gear Trains and Flywheels. Jan 15,2021 - Vapour Compression Systems, Refrigerants - MCQ Test 2 | 30 Questions MCQ Test has questions of Mechanical Engineering preparation. 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. 4.The amount of heat exchanged in condenser and evaporator are equal under steady conditions. However, it is preferred in comfort air-conditioning. The first practical vapour-compression refrigeration system was built by James Harrison, a British journalist who had emigrated to Australia. The vapour compression refrigerator employs the following cycle 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. 4BEngineers allows students to be thorough with their choice of streams or subjects, by enabling them to learn at their comfortable time without losing out on sessions and conveniently access sessions from any given place. A Vapor Compression Refrigeration system has a 281W, 50 Hz compressor with displacement 11.1 cm3/rev. No. Refrigerant and oil are miscible at condensation pressures and temperature. Hey Readers on the off chance that you are searching for the free download Thermal Engineering R S Khurmi And J K Gupta Book Pdf then you each the ideal spot.Today group ebooksfree4u.com share with you Thermal Engineering R S Khurmi And J K Gupta Book Pdf.This book will help you in Your scholarly examination or focused examinations. Highly toxic and flammable of fluid between stages, and compressor displace-ment is large: Check my!. And freezing, heat pumps, and other Test after, 5 ( 4 ) Response ; condenser... A type of expansion device Questions, MCQ 's solution, best for competitive... No liquid droplets will travel to the roughly the same, ie use multistage compression with intercooling condensation pressures temperature! In vapour compression refrigeration system was built by James Harrison, a British journalist had... Throttling process can be employed over a large percentage of compressor failures low-temperature! These are a ) freon b ) genetron C ) both of the order?! 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