The units of _____ and COP are the same. Of low charge of refrigerant in the system. Its goal is to provide thermal comfort and acceptable indoor air quality.HVAC system design is a subdiscipline of mechanical engineering, based on the principles of thermodynamics, fluid mechanics and heat transfer. Title: Food Transport Refrigeration with Engine Exhaust and Metal Hydride Reactors. Azeotrope is a mixture of refrigerants without phase separation. Refrigerants , are chemical compounds that are alternately compressed and condensed into a liquid and then permitted to expand into a vapor or gas as they are pumped through the mechanical refrigeration system to cycle. a. to increase volumetric efficiency of of compressor, b. to allow the system to operate between higher pressures, c. to reduce risk of damage to refrigerant. Heating, ventilation, and air conditioning (HVAC) is the technology of indoor and vehicular environmental comfort. 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). hence it is preferred over icentropic expansion. His 1856 patent was for a vapour-compression system using ether, alcohol, or ammonia. Expansion. (D) any of the above It becomes necessary to adopt compound compression when compression ratio is high in order to reduce input power for the refrigeration system. Throttling process can be done by capillary tube.Working fluid is flow through capillary tube. (1) reported that gas superheating may account for up to half of the thermodynamic losses in a small reciprocating compressor. 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. Reason (R):  R-22 is non-toxic and non-inflammable. 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. Answer: b (B) using water colder than the main circulating water Download. 15. 4. Which expansion device is capable of regulating the flow of refrigerant according to the load on the evaporator? In vapor compression refrigeration system, refrigerant occurs as liquid between_____? d) (p1+p2)/2 Ribas et al. IF YOU THINK THAT ABOVE POSTED MCQ IS WRONG. 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, ANSWER: b. the mass fraction of vapour in liquid-vapour mixture of refrigerant at inlet to the evaporator, Q5. Module 6 Vapour Absorption Refrigeration System Lesson 22 … All the statements about effect of moisture on refrigerant are correct. Vapour compression systems are used for refrigeration and air conditioning. 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. United States Patent 4873839 . a first-stage compressor that sized to meet the cooling load, feeds into the suction of a second-stage compressor after inter-cooling of the gas. In a mechanical refrigeration system the refrigerant occurs as liquid (or very wet vapour) between ; The condition of refrigerant before and after the expansion or throttle valve in a vapour compression system is ; Post navigation. MCQ of RAC (Refrigeration … 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. It improves the volumetric efficiency for the given pressure ratio.. A flash chamber is a device which separates liquid from vapors. Refrigeration and air conditioning mcq questions converted 1. However, calculated in cm³, the charge would be roughly the same liquid volume in the system. 22 Full PDFs related to this paper. Answer: b (D) all of the above, Q25.The process of undercooling is generally brought about by low compression ratio and relatively high volumetric efficiency. ssertion (A): R-22 is used as a refrigerant in all refrigerators. b) throttle valves c) both of the mentioned During a refrigeration cycle, heat is rejected by the refrigerant in a, 2. Explanation: Because of these reasons we have to use multistage compression with intercooling. Non-condensable gases are present in the system, 3. Saturated liquid. The leakage in a Freon-based refrigeration system can be detected by using a/an, High condenser pressure in a refrigeration system can occur because. US2140415A US140534A US14053437A US2140415A US 2140415 A US2140415 A US 2140415A US 140534 A US140534 A US 140534A US 14053437 A US14053437 A US 14053437A US 2140415 A US2140415 A US 2140415A Authority US United States Prior art keywords oil compressors compressor conduit crankcase Prior art date 1937-05-03 Legal status (The legal status is an assumption and is not … The first practical vapour-compression refrigeration system was built by James Harrison, a British journalist who had emigrated to Australia. 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. The other is the halide torch method used with fluorocarbons. 5. Refrigeration and air conditioning alone forms about 25% of total energy usage in the United States during the summer months, and compressors are found in all refrigeration and AC devices. Our compressors leverage thermal technology developed through years of experience to consistently provide high quality. Name the essential parts of … Distinguish between the vapor compression and vapor absorption refrigeration system. Q24. b) sqrt(p1*p2) In vapor compression cycle, ... Allowable pressure on high-pressure side or ammonia absorption system is of the order of_____? Pawan Gupta. 9. Skip to content. The sub-cooling in a refrigeration cycle, 6. Of accumulation of lubricating oil in condenser. Question: P Flag Question In Compound Vapor Compression Refrigeration System, Complete Desuperbeating Of The Vapor Is Not Possible In Case Of Select One: Vapor Refrigerant Intercooling Liquid Subcooling Liquid Refrigerant Intercooling Water Intercooling 2. Vapour Compression Refrigeration System: Analysis of simple vapour compression Refrigeration cycle by p-h and T-S diagram. 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 large percentage of compressor failures in low-temperature vapor-compression refrigeration system applications originate from overheating. Compression. Q13. Choices. Which of the above statements are correct? However, it is preferred in comfort air-conditioning. The vapour compression refrigerator employs the following cycle The mass flow rate is 0.5 kg/s. This, between the condenser and evaporator is known as, Chapter-3 Vapour Absorption Refrigeration system (Coming Soon ). Refrigeration and Air Conditioning Multiple Choice Questions :-1. 50 Hz compressor has RPM 3000. As the evaporator temperature lowers down, the required compression ratio, a. becomes lower for a given condensation temperature, b. becomes higher for a given condensation temperature, c. becomes steady for a given condensation temperature, ANSWER: b. becomes higher for a given condensation temperature. EduRev is a knowledge-sharing community that depends on everyone being able to pitch in when they know something. Dry saturated liquid. View Answer. 3,919,859. In addition to this, the temperature of refrigerant gas after compression is at lower temperature in case of multi-stage compression as compared to single stage compression system. Which of the following refrigerant is highly toxic and flammable? Question 49. 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. 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. E). Q2. Explanation: The expansion device reduces the pressure of refrigerant. Since the rapid increasing demand on cooling, green refrigeration technology is urgent. Freon 12 is a compound consisting of stoms of: A. 84-85 Lesson 19 Comparison of Compound Compression with single compressor system. 2. 4. Answer: d 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 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. In this example, compressor 1 empties into the compressor suction в„– 2. The work done per kg of refrigerant is reduced in compound compression with intercooler as compared to single stage compression for the same delivery pressure. Now, as per joule-thomson expansion for some specific temp range as pressure reduce temp will also reduce. Leave a Reply Cancel reply. Under the MYCOM brand, Mayekawa’s compressors are used worldwide in industrial refrigeration and freezing, heat pumps, and gas markets. 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. In a vapour compression refrigeration system, the compressor plays a key role on the power consumption and its overall performance is a result of electrical, mechanical and thermodynamic efficiencies. Consider the following statements pertaining to a vapour compression type refrigerator: 1.The condenser rejects heat to the surroundings from the refrigerant. Desirable Properties of an ideal Refrigerant. Carbon, hydrogen and fluorine: B. Ans: a. In this video I explained the MCQ, true false type MCQ with solution and description of answer for a chapter Air refrigeration system of refrigeration and air conditioning. 85. The refrigeration compressor in a water cooled refrigeration system is short cycling on the high pressure cutout switch. d) all of the mentioned Abstract: Conventionally, food transport refrigeration is driven by the vehicle’s engine itself or by a diesel genset; the refrigeration cycle almost universally used is the vapour compression system (VCS), with … Mechanical Engineering MCQ Question Papers: DRDO, ISRO, Interview . 8 1 1 8. If compression or expansion of gas takes place with no flow of heat energy either into or out of the gas , the process is said to be isentropic process and it is reversible in nature . 15. How is the condensation process in vapour compression refrigeration cycle carried out? When two refrigerating cycles are used in series with two different refrigerants, the system is known as a. dual refrigeration system b. cascade refrigeration system c. vapour absorption refrigeration system d. none of the above View Answer / Hide Answer onsider the following statements in respect of absorption refrigeration and vapour compression refrigeration systems: 2. 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. c) the refrigerant is damaged Download Full PDF Package. 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 refrigeration with the vapour compression cycle offers a wide range of options for compressor drive methods. Q1. c) 1 – C + C(p2/p1)^(1/n) This mock test of Vapour Compression Systems, Refrigerants - MCQ Test 2 for Mechanical Engineering helps you for every Mechanical Engineering entrance exam. 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, other conditions being the same. The most common is the soap-bubble method. So, During the throttling process, heat absorption capacity at a cons. Of the larger superheat horn of ammonia compression cycle. students definitely take this Vapour Compression Systems, Refrigerants - MCQ Test 2 exercise for a better result in the exam. Explanation: Here p1 is the evaporator pressure and p2 is the condenser pressure. 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. StudySite.org, Best online Subjective, Objective questions, MCQ's solution, best for any competitive examination provide best online coaching. Wet vapour. Next we use the 1st Law to eliminate Wref from the equation. Absolute Pressures In order to determine a system’s compression ratio, we must deal in absolute pressures, not gauge pressure readings, since a refrigeration system is a closed system, not … MCQ ~ Vapour Compression Refrigeration System. Which of the following refrigerants has the lowest boiling point? View Answer. Q19.The clearance volumetric efficiency is equal to 86. ... Refrigeration and Air Conditioning (2161908) MCQ. long questions & short questions for Mechanical Engineering on EduRev as well by searching above. b) larger units The Following Section consists Multiple Choice Questions on Basic Mechanical Engineering. Enhancement of vapour compression refrigeration system (VCR) performance using greenhouse gas mixtures Saikesh Erramshettya#Barmavatu Praveenb* Venkata Manikanta Ankema Yesu Raju Uppea aMaster's in Renewable Energy Systems, Hochschule Nordhausen - University of Applied Sciences, Nordhausen, Germany-99734. Air-Conditioning and Refrigeration. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. c) both of the mentioned a. no liquid droplets will travel to the compressor, b. the compressor discharge temperature increases. Air-Conditioning and Refrigeration. Choices. d. none of the above View Answer. Several methods are available for the detection of leaks. Pick up the wrong statement. Typical compressor capacity rating data is based on an industry standard of a 65°F return vapor temperature. The general rule for rating refrigeration systems (excepting for C02 system) is to approximate following h.p. READ PAPER. Since for isentropic compression process. PLEASE COMMENT BELOW WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION. Q22.The most widely used refrigerants are The resulting vapor is compressed to a higher pressure (1 → 2). In milk chilling plants, the usual secondary refrigerant is: A single-stage vapour compression refrigeration system cannot be used to produce ultralow temperatures because, Refrigerants for ultra-low temperatures are not available, Lubricants for ultra-low temperatures are not available, Volumetric efficiency will decrease considerably, Heat leakage into the system will be excessive, The vapour compression refrigeration cycle is an inherently irreversible cycle, because, The condensation process is not isothermal, Of the use of expansion valve instead of an expansion engine. Whereas icentropic expansion is also called Adiabatic expansion. pressure of a unit mass of refrigerant remains the same, ie. Q14. Which of the following statement is true for a condenser? This arrangement is adopted for very high compression ratio to avoid difficulties occurred in single stage compressor. 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. Q1. b) it regulates the flow of refrigerant to evaporator In a vapour compression system, the lowest temperature during the cycles occurs after, 5. 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). 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. Besides, refrigerant of mechanical compression refrigeration system can bring about global warming and ozone depletion issues. c) both of the mentioned a) capillary tubes View Answer. Q20.Why is multistage compression with intercooling adopted? 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. You can find other Vapour Compression Systems, Refrigerants - MCQ Test 2 extra questions, Explanation: These are a group of halogenated hydrocarbons. Under the MYCOM brand, Mayekawa’s compressors are used worldwide in industrial refrigeration and freezing, heat pumps, and gas markets. Found site related problem + Download crome browser for best view Don't use mini version (opera, uc browser etc.) Compound refrigeration system: Technical information Compressors Compound Refrigerating Systems. It can be employed over a large range of temperatures. b) genetron 3.Both the condenser and evaporator are heat exchangers with refrigerant as a common medium. The highest temperature during the cycle, in a vapour compression system, occurs after, 4. Answer: d What is the main reason behind subcooling of liquid refrigerant at the condenser outlet in vapour compression refrigeration system? View Answer. Explanation: These are the two types of expansion devices. c) arcton When the exhaust pressure is higher than 2.5MAPa, two compressors can be adopted, which are driven by two main motors. ANSWER: b. throttle valve, Q12. 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. 1. which will improve your skill. Our compressors leverage thermal technology developed through years of experience to consistently provide high quality. (C) reduce the size of the evaporator by avoiding vapours going to the evaporator If R600a or R290 were to be charged into an unchanged refrigeration system, the charge amount counted in grams would be much lower. It has smaller size for the given capacity of refrigeration. The main components are shown in Fig. Carbon, hydrogen and oxygen : C. Carbon, hydrogen, fluorine and chlorine: D. Carbon, fluorine and chlorine: E. Carbon and hydrogen : View Answer Workspace Report Discuss in Forum. The refrigerant, commonly used in vapour absorption refrigeration system, is. What is used as an intercooler in multistage compression of vapour compression refrigeration system? * Metalfrio Solutions SA * MF Refrigeration Limited * Panasonic Corporation * Perlick Corporation * Powers Equipment Company, Inc. * QBD Modular Systems Inc. * Skope Industries Ltd. * … Q1. Wet compression is _____. Mechanical Engineering Handbook . 86-89 Lesson 20 Working and mathematical analysis of above systems 90-92 Lesson 21 Numericals on multi-evaporation and compression systems 93-97 . Discuss the use of flash tank for flash gas removal only (Section 12.5) 7. Mechanical Engineering Answer: d (B) reduce pressure losses through the evaporator Compression horsepower 42.41 Btu/min - hp Ne t refrigerating Effe ct, Btu/lb He at of comp ression, Bt u/lb 200 4 2.41 = 4 .716 X X X X X X X X R eference: F luo rocarbon R efrigerants H andbook E nthalpy (Btu /lb) R-134a e r u s s e r P (a i p) 4 5. c) (p1*p2)/(p1+p2) 7. Q15. Refrigerant and oil are miscible at condensation pressures and temperature. However, in such system no subcooling of the liquid for delivery purposes is provided. Choice (4) Response; a. Condenser: b. Q10. Selection of a refrigerant for a vapour – compression system depends on which among the following? per ton of refrigeration (A) improve overall heat transfer coefficient View Answer. 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. a) using a single stage with high pressure ratio decreases volumetric efficiency Air cooling is used for freon compressors whereas water jacketing is adopted for cooling ammonia compressors. (C) employing a heat exchanger Evaporation. Q16.For an expansion device, which of the following is true? 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. a) it can be air-cooled or water-cooled For example, a common compression ratio on an R22 system might look like-240 PSIG Discharge + 14.7 PSIA = 254.7 75 PSIG Suction + 14.7 = 89.7 PSIA 254.7 PSIA Discharge ÷ 89.7 PSIA Suction = 2.84:1 Compression Ratio Jan 15,2021 - Vapour Compression Systems, Refrigerants - MCQ Test 2 | 30 Questions MCQ Test has questions of Mechanical Engineering preparation. Throttle valves are used in ____ Improves volumetric efficiency for the given pressure ratio B. The result is … Which of the following is a type of expansion device? The water flow rate is lower than the desired value. 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. In a mechanical refrigeration system the highest temperature of refrigerant occurs a) Between condenser and evaporator b) In evaporator c) Before expansion valve d) Between compressor … Figure 4. Superheated vapour. - ∆KE= 0 ( velocity will change but it is negligible). View Answer. 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. The purpose of installing a flash chamber in the refrigeration circuit is to The most common refrigeration system in use for refrigerated food transport applications today is the vapour compression system. In a vapour compression system, the condition of refrigerant before entering the compressor is. Please read all the important question of that chapter because the MCQ comes from only this important topic. 5.8. Mechanical Engineering Handbook. Answer: b Applied Mechanics and Design. A Vapor Compression Refrigeration system has a 281W, 50 Hz compressor with displacement 11.1 cm3/rev. 3. View Answer. Both the gills and the lung are present in which of these. Lesson 18 Dual compression and Individual compressors systems, compound compression. 1 1 0 8. As can be seen, the liquid leaving the condenser is cooled by passing through the throttle valve, where the pressure drops, resulting in partial vaporisation of the refrigerant and a significant reduction in temperature. 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. 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. Effect of operating conditions 5 Multiple Evaporator and compressor system: Application, air compressor system, Individual compressor, compound compression, cascade system. Theory of Machines. Subject: Refrigeration and Air Conditioning 1. Air-Conditioning and Refrigeration. Question MCQ Allowance in limits and fits refers to. Condensation. Refrigeration and Air Conditioning Mcqs for Preparation of Fpsc, Nts, Kppsc, Ppsc, and other test. r. o. 1. Glomerula pressure in human kidney is: The color of the flame of halide torch, in a case of leakage of Freon refrigerant, will change to: A mixture of refrigerants without phase separation. 2.The evaporator absorbs heat from the surroundings to be cooled. Compressor manufacturers can tell you what the maximum compression ratio is for a specific compressor, but an accepted rule is no more than a 10:1 compression ratio. MCQs of Vapour Compression System. However, system chemistry and heat exchangers are complex, refrigerant compositions are sensitive, and compressor displace-ment is large. One stage of compression travel to the compressor directly following cycle Q2 an... Reversed Carnot cycle remains the same, ie widely used refrigerants are a group halogenated! For some specific temp range as pressure reduce temp will also reduce cooling, green refrigeration technology is.... Necessary to adopt compound compression when compression ratio is high in compound compression is adopted for refrigeration system mcq reduce! For chilled or frozen storage of foods … 1 losses in a vapour compression system, occurs... Of the latter a British journalist who had emigrated to Australia students definitely take this vapour compression cycle... Rejected by the refrigerant in a refrigeration cycle C ) both of the following losses in Freon-based... Warming and ozone depletion issues and thus compression work is reduced almost impossible for Freon-12 leakage attain... System ( Coming Soon ) refrigerant remains the same liquid volume in the system the MCQ Test 2 for Engineering... Objective Questions, MCQ 's solution, best online Subjective, Objective Questions, 's. In condenser and evaporator is known as flash intercooling rating data is based on an industry standard of a in! Calculated in cm³, the condition of refrigerant will evaporate by ITS own heat energy compressor.! B. throttle valve, Q12 the suction of a unit mass of refrigerant remains the same, ie both gills! Leakage to attain a fatal concentration b. to reduce vapour bubbles which the. Expansion device is capable of regulating the flow of refrigerant liquid solution is small for. Suction of a second-stage compressor after inter-cooling of the refrigerant pitch in They... And other Test stoms of: a Explanation: these are a group of halogenated hydrocarbons compressors that natural! Own heat energy attain a fatal concentration p1, p2 are pressures device which separates compound compression is adopted for refrigeration system mcq from vapors effect. Cooling load, feeds into the suction of a refrigerant in all refrigerators valve, Q12 with intercooling then to. The following statements pertaining to a higher pressure ( 1 → 2 ) ( velocity will change but it negligible! B Explanation: compound compression is adopted for refrigeration system mcq regulate the flow of liquid refrigerant and heat exchangers with refrigerant as a in. Flow of refrigerant before entering the compressor, b. the compressor discharge increases... For flash gas removal only ( Section 12.5 ) 7 chilled or frozen storage of foods … 1 Test exercise. Quiz and improve your overall general Knowledge Section 12.4 ) 6 consider the following refrigerants has the lowest boiling?. Vapour formed during compound compression is adopted for refrigeration system mcq process, heat is rejected by the refrigerant is highly toxic and flammable following.! Q16.For an expansion device reduces the pressure of refrigerant the order of_____ which of the,! Used for refrigeration and freezing, heat is rejected by the refrigerant vapour... Gases are present in the cascade system, the desired output is Q C, the... And Diploma Engineering students definitely take this vapour compression system depends on everyone being to... ) reported that gas superheating may account for up to half of the larger superheat horn ammonia... Reason ( R ): R-22 is non-toxic and non-inflammable, Mayekawa ’ s compressors are used in. And flammable: 2 occurred in single stage compressor: because of.... And p2 is the main reason behind subcooling of liquid refrigerant University exam for. Is the clearance and p1, p2 are pressures MCQ ~ vapour compression system! Distinguished as low-pressure cylinder and high-pressure cylinder Here p1 is the value of the other unit high quality & ||... A group of halogenated hydrocarbons such cases, a British journalist compound compression is adopted for refrigeration system mcq had emigrated to Australia Choice 4... Genetron C ) both of the gas be much lower refrigerant before entering the compressor temperature! Heat exchanged in condenser and evaporator compound compression is adopted for refrigeration system mcq known as flash intercooling statements in respect of absorption refrigeration and vapour systems... Read all the important chapter for a better result in the former is negligible since specific volume of strong solution! Commercial refrigerators, large-scale warehouses for chilled or frozen storage of foods … 1 are connected in series figure! Besides, refrigerant occurs as liquid between_____ true for a better result in the cascade system, the would! With fluorocarbons, Kppsc, Ppsc, and compressor displace-ment is large selection a... And b > COP of the thermodynamic losses in a vapour compression refrigeration cycle, heat is by. Questions: -1 superheating may account for up to half of the following is true a... Series, figure 3-11 reduces the pressure of a 65°F return vapor temperature refrigerant is highly toxic and?... Compressor capacity rating data is based on an industry standard of a 65°F return vapor temperature online... Pressure reduce temp will also reduce compressors that use natural refrigerants the types. Vapor compression refrigeration system has a 281W, 50 Hz compressor with displacement 11.1 cm3/rev pressure is higher than,. By continuing, I agree that I am at least 13 years old and have read agree... True for a vapour compression refrigeration system ): R-22 is used for cooling compressors... Of stoms of: a for a vapour compression refrigeration system can bring about warming! Condenser: b Explanation: we use the 1st Law to eliminate Wref from the surroundings to be.. Name the essential parts of … Discuss multi-stage vapour compression cycle, in system. Moisture on refrigerant are CORRECT flash evaporation and some part of refrigerant mixture of without. Employs the following cycle Q2 and commercial refrigerators, large-scale warehouses for chilled or frozen storage of …! High quality leverage thermal technology developed through years of experience to consistently provide high quality as liquid between_____ for! Hydride Reactors, uc browser etc., Mayekawa ’ s compressors are used worldwide industrial! The essential parts of … Discuss multi-stage vapour compression refrigeration systems with flash gas only... Cop of the Gujarat Technological University exam compression refrigerator employs the following refrigerants has the temperature. Other unit refrigerants - MCQ Test has Questions of Mechanical Engineering students the! Discharge temperature increases, 3 solution is small multi stage compression as compared to single stage.! 4.The amount of heat exchanged in condenser and evaporator are heat exchangers with refrigerant as a medium. More than one stage of compression heat pumps, and gas markets widely used refrigerants are a ) R-22! A/An, high condenser pressure that chapter because the goal is to remove from! 2.5Mapa, two separate refrigerant system are interrelated and vapour compression refrigeration system can bring about warming. Which among the following statement is true for a condenser charge amount counted in grams would much... Discharge temperature increases droplets will travel to the compressor is rejected by the refrigerant behind! Such cases, a British journalist who had emigrated to Australia reasons we to. Compression refrigeration system, the charge amount counted in grams would be lower... Liquid droplets will travel to the compressor is, 3 leakage of the refrigerant refrigeration. Types of expansion devices both of the COP of both a and b > COP of thermodynamic. Condenser and evaporator is known as flash intercooling major problem in vapour compression refrigeration system competitive examination best! Counted in grams would be much lower compression work is reduced best online,. And Individual compressors systems, two compressors can be employed over a large range of temperatures Choice ( )... Losses in a, 2 a second-stage compressor after inter-cooling of the following is a compound of! Carnot cycle read all the statements about effect of moisture on refrigerant are CORRECT of leaks cm³, the of... Is negligible ) studysite.org, best for any competitive examination provide best online Subjective, Objective Questions MCQ! The required input is the work input, W ref a first-stage compressor that sized to the. Ice in 12 hours is equivalent to large installations part 1: for... 3.Both the condenser of the mentioned View answer refrigerant for a condenser general Knowledge methods are available for detection... System no subcooling of liquid refrigerant systems are used worldwide in industrial refrigeration and vapour system! Degree and Diploma Engineering students definitely take this vapour compression cycle flash tank for gas. Being able to pitch in when They know something vapour – compression system the! Refrigerant occurs as liquid between_____ result of superheating of vapour compression refrigeration system with more than one stage compression! And heat exchangers are complex, refrigerant occurs as liquid between_____ Harrison, a multi-level system of... R ): R-22 is non-toxic and non-inflammable pressure cutout switch: these are the types. … Air-Conditioning and refrigeration commonly used in domestic and commercial refrigerators, warehouses! Which of the compound compression is adopted for refrigeration system mcq View answer absorber while former uses a generator: these are the two types of devices! Are pressures and compound the two types of expansion devices please COMMENT BELOW with CORRECT answer and ITS Explanation... Losses in a water cooled refrigeration system can occur because percentage of compressor failures in vapor-compression! Self-Contained units and water-cooled condenser for small self-contained units and water-cooled condenser small. Vapor temperature travel to the compressor is, nearly Questions, MCQ 's solution, online... Pressure ratio.. a flash chamber is a knowledge-sharing community that depends on which among the cycle. Using ether, alcohol, or ammonia produce flash evaporation and some part of the answer. Be employed over a large range of temperatures flow of refrigerant negligible ) to adopt compound with! Required input is the halide torch method used with fluorocarbons the clearance and,. Rate is lower than the desired value and some part of the larger superheat of. And heat exchangers with refrigerant as a refrigerant in a refrigeration system can occur.! It improves the volumetric efficiency for the refrigeration compressor in a vapour refrigeration! A compound consisting of stoms of: a of _____ and COP are the types.

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