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. Carbon, hydrogen and fluorine: B. c) both of the mentioned When the exhaust pressure is higher than 2.5MAPa, two compressors can be adopted, which are driven by two main motors. 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. 15. The highest temperature during the cycle, in a vapour compression system, occurs after. Pick up the wrong statement. b) high pressure ratio with dry compression gives high compressor discharge temperature c) arcton Q16.For an expansion device, which of the following is true? Under the MYCOM brand, Mayekawa’s compressors are used worldwide in industrial refrigeration and freezing, heat pumps, and gas markets. Module 6 Vapour Absorption Refrigeration System Lesson 22 … Question MCQ Allowance in limits and fits refers to. students definitely take this Vapour Compression Systems, Refrigerants - MCQ Test 2 exercise for a better result in the exam. 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. 1. Adsorption refrigeration is regarded as because it can be driven by low-grade heat and use natural refrigerants. a) it increases the pressure of refrigerant 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. How is the condensation process in vapour compression refrigeration cycle carried out? Theory of Machines. ... Refrigeration and Air Conditioning (2161908) MCQ. Q13. 85. 5.8. c) both of the mentioned Most of the domestic refrigerators work on the following refrigeration system (a) vapour compression (b) vapour absorption (c) carnot cycle (d) electrolux refrigerator (e) dual cycle. 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. 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. No. The most common is the soap-bubble method. 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 What is the use of multistage compression in vapour compression refrigeration system? View Answer. It becomes necessary to adopt compound compression when compression ratio is high in order to reduce input power for the refrigeration system. Air-Conditioning and Refrigeration. Subject: Refrigeration and Air Conditioning 1. The Following Section consists Multiple Choice Questions on Basic Mechanical Engineering. The resulting vapor is compressed to a higher pressure (1 → 2). Since for isentropic compression process. Edit. Ans: b. 2. This arrangement provides the means for cooling of fluid between stages, and thus compression work is reduced. (A) circulating more quantity of cooling water through the condenser In a vapour compression system, the condition of refrigerant before entering the compressor is. Download app for fast access + Download from play store Add to Bookmark All Engineering + … United States Patent 4873839 . (B) reduce pressure losses through the evaporator Q21.The intercooler pressure is given by Throttling process can be done by capillary tube.Working fluid is flow through capillary tube. 50 Hz compressor has RPM 3000. The refrigerant, commonly used in vapour absorption refrigeration system, is. Answer Answer: b Compound refrigeration system: Technical information Compressors Compound Refrigerating Systems. Of the larger superheat horn of ammonia compression cycle. 8. Choices. In a vapour compression system, the lowest temperature during the cycles occurs after, 5. His 1856 patent was for a vapour-compression system using ether, alcohol, or ammonia. Since the rapid increasing demand on cooling, green refrigeration technology is urgent. Typical compressor capacity rating data is based on an industry standard of a 65°F return vapor temperature. (D) any of the above d) (p1+p2)/2 MCQ ~ Vapour Compression Refrigeration System. Download PDF. Explanation: These are the two types of expansion devices. 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. low compression ratio and relatively high volumetric efficiency. The first practical vapour-compression refrigeration system was built by James Harrison, a British journalist who had emigrated to Australia. Effect of operating conditions 5 Multiple Evaporator and compressor system: Application, air compressor system, Individual compressor, compound compression, cascade system. In evaporation process of vapour compression refrigeration system, a. heat is rejected from refrigerant to surroundings, b. heat is rejected from surroundings to refrigerant, ANSWER: b. heat is rejected from surroundings to refrigerant, Q6. What is the value of the COP of the vapour compression refrigeration system? 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. Answer: d d) none of the mentioned a. no liquid droplets will travel to the compressor, b. the compressor discharge temperature increases. Azeotrope is a mixture of refrigerants without phase separation. Expansion. MCQ of RAC (Refrigeration … Pick up the wrong statement. The mass flow rate is 0.5 kg/s. Mechanical refrigeration, is the utilization of mechanical components arranged in a "refrigeration system" for the purpose of transferring heat. Of low charge of refrigerant in the system. In such cases, a multi-level system is used. a) it can be air-cooled or water-cooled Answer: a A standard ice point temperature corresponds to the temperature of (a) water at 0°C (b) ice … Glomerula pressure in human kidney is: The cylinders in compound compressor distinguished as low-pressure cylinder and high-pressure cylinder. * Metalfrio Solutions SA * MF Refrigeration Limited * Panasonic Corporation * Perlick Corporation * Powers Equipment Company, Inc. * QBD Modular Systems Inc. * Skope Industries Ltd. * … d) all of the mentioned Condensation. 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. 15. (1) reported that gas superheating may account for up to half of the thermodynamic losses in a small reciprocating compressor. In refrigeration systems, two or more compressors are connected in series, figure 3-11. 1 1 0 8. It has smaller size for the given capacity of refrigeration. 4.The amount of heat exchanged in condenser and evaporator are equal under steady conditions. Then, COP of both A and B > COP of Reversed Carnot Cycle. a) 1 + C + C(p2/p1)^(1/n) This yields charges of approx. Freon 12 is a compound consisting of stoms of: A. Mechanical refrigeration with the vapour compression cycle offers a wide range of options for compressor drive methods. 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. Skip to content. 0. Lesson 18 Dual compression and Individual compressors systems, compound compression. a) capillary tubes c) large installations use air-cooled condenser Answer: d Explanation: Here C is the clearance and p1,p2 are pressures. Compression. Explanation: Because of these reasons we have to use multistage compression with intercooling. Q1. c) (p1*p2)/(p1+p2) 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. StudySite.org, Best online Subjective, Objective questions, MCQ's solution, best for any competitive examination provide best online coaching. b) 1 – C – C(p2/p1)^(1/n) Selection of a refrigerant for a vapour – compression system depends on which among the following? For entropy s = 0.95 the enthalpy h = 276.45 kJ /kg, Large latent heat of vaporisation and low operating pressures, Small latent heat of vaporisation and high operating pressures, Large latent heat of vaporisation and large operating pressures, Small latent heat of vaporisation and low operating pressures. By continuing, I agree that I am at least 13 years old and have read and agree to the. MCQ No - 1. Q22.The most widely used refrigerants are Only liquid is then passed to evaporator and the vapors will be passed to the compressor directly. In a refrigeration cycle, the desired output is Q C, because the goal is to remove heat from the cold reservoir. 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). d) none of the mentioned Improves volumetric efficiency for the given pressure ratio B. Refrigeration Cycle In a vapor compression refrigeration system a gas (refrigerant) is alternatively compressed and expanded and goes from the liquid to the vapor state. Found site related problem + Download crome browser for best view Don't use mini version (opera, uc browser etc.) Prototypes have shown the ability to provide a 7°C of cold source at an ambient temperature of 30°C (COP equals to 3–7), comparable or higher than that of vapour compression heat pump systems. View Answer. It improves the volumetric efficiency for the given pressure ratio.. A flash chamber is a device which separates liquid from vapors. 4. 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. Besides, refrigerant of mechanical compression refrigeration system can bring about global warming and ozone depletion issues. Answer: b However, system chemistry and heat exchangers are complex, refrigerant compositions are sensitive, and compressor displace-ment is large. All such systems have four components: a compressor, a condenser, an expansion valve (also called a throttle valve or meteric device) and an evaporator. The vapour compression refrigerator employs the following cycle What are the desirable properties of refrigerant? Answer: b Evaporator from one unit is used for cooling the condenser of the other unit. Choice (4) Response; a. Condenser: b. A large percentage of compressor failures in low-temperature vapor-compression refrigeration system applications originate from overheating. Wet compression is _____. E). 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. a) p1*p2 The heat required to melt 1 tonne of ice in 12 hours is equivalent to. Title: Food Transport Refrigeration with Engine Exhaust and Metal Hydride Reactors. The multi stage compression as compared to single stage compression..... A. (C) employing a heat exchanger Match List-I (Refrigerant) with List-II (Designation) and select the correct answer using the codes given below the lists: Theoretical vapour compression refrigeration cycle is represented on a T-s diagram as. Which of the above statements are correct? Figure Refrigeration and Air Conditioning MCQ Questions 1-One ton of refrigeration is equal to (A) 21 KJ/min (B) 105 KJ/min (C) 210 KJ/min (D) 420 KJ/min 2-A low side float valve maintains the level of refrigerant in (A) Flooded evaporator (B) Evaporator (C) Condenser (D) Compressor 3-When wet bulb and dry bulb … Ans: b 2. Vapour compression Cycle important Theory & Mcq || RGPV Online exam 2020 || Chapter-2 || RAC, 1. b) sqrt(p1*p2) Air-Conditioning and Refrigeration. The main components are shown in Fig. 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. READ PAPER. Only liquid is then passed to evaporator and the vapors will be passed to the compressor directly. 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. This, between the condenser and evaporator is known as, Chapter-3 Vapour Absorption Refrigeration system (Coming Soon ). Mechanical Engineering Handbook. Q18. Refrigeration and Air Conditioning Mcqs for Preparation of Fpsc, Nts, Kppsc, Ppsc, and other test. long questions & short questions for Mechanical Engineering on EduRev as well by searching above. Q23.1. 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. c) 1 – C + C(p2/p1)^(1/n) Q3. Reason (R): It is almost impossible for Freon-12 leakage to attain a fatal concentration. 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. 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. 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. b) throttle valves Expansion valve: c. Evaporator: d. Compressor: Check my answer! 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. Choices. It can be employed over a large range of temperatures. View Answer. Which of the following is a type of expansion device? which will improve your skill. 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. The pumping work in the former is negligible since specific volume of strong liquid solution is small. The condition of refrigerant before and after the expansion or throttle valve in a vapour compression system is: A. Vapour compression systems are used for refrigeration and air conditioning. Answer: c 8 1 1 8. Applied Mechanics and Design. Of accumulation of lubricating oil in condenser. Question 49. The coefficient of performance is quite high. Answer: d Download. 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. 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. Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle? 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. The latter uses an absorber while former uses a generator. If R600a or R290 were to be charged into an unchanged refrigeration system, the charge amount counted in grams would be much lower. 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. In a vapour compression plant, if certain temperature differences are to be maintained in the evaporator and condenser in order to obtain the necessary heat transfer, then the evaporator saturation temperature must be: Higher than the derived cold-region temperature and the condenser saturation temperature must be lower than the available cooling water temperature by sufficient amounts, Lower than the derived cold-region temperature and the condenser saturation temperature must be lower than the available cooling water temperature by sufficient amounts, Lower than the derived cold-region temperature and the condenser saturation temperature must be higher than the available cooling water temperature by sufficient amounts, Higher than the derived cold-region temperature and the condenser saturation temperature must be higher than the available cooling water temperature by sufficient amounts. (C) reduce the size of the evaporator by avoiding vapours going to the evaporator What is the main reason behind subcooling of liquid refrigerant at the condenser outlet in vapour compression refrigeration system? Next . Need of throttling process- To reduce pressure and temperature without change in enthalpy. 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. 4. 3. In a vapour compression system, the condition of refrigerant before entering the compressor is, 3. 2. View Answer. 84-85 Lesson 19 Comparison of Compound Compression with single compressor system. Moisture should be removed from refrigerants to avoid. Wet vapour. Leave a Reply Cancel reply. The highest temperature during the cycle, in a vapour compression system, occurs after, 4. Q20.Why is multistage compression with intercooling adopted? A – 3- stage compound compression system merely adds another stage, and another intercooler, to a 2- stage compound system. The purpose of installing a flash chamber in the refrigeration circuit is to c) the refrigerant is damaged 86-89 Lesson 20 Working and mathematical analysis of above systems 90-92 Lesson 21 Numericals on multi-evaporation and compression systems 93-97 . How it works : Energy equation for refrigerant, (h + KE +PE )of inlet + Q - W = (h +KE +PE)of outlet. 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. MCQs of Vapour Compression System. EduRev is a knowledge-sharing community that depends on everyone being able to pitch in when they know something. The other is the halide torch method used with fluorocarbons. Pawan Gupta. In a vapour compression refrigeration system, a throttle valve is used in place of an expander because (A) It considerably reduces mass of the system (B) It improves the C.O.P., as the condenser is small (C) The positive work in isentropic expansion of liquid is very small (D) It leads to significant cost reduction 3. Evaporation. Saturation pressure – temperature relationship. 1. Using SCORG on refrigeration and air-conditioning compression alone and reducing their energy consumption by up to 6%, can lead to a potential saving of at least 1.5% of US total energy consumption. Q8. All the statements about effect of moisture on refrigerant are correct. 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. 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. r. o. 1. View Answer. With a neat sketch, explain the working of room air conditioner. 2.The evaporator absorbs heat from the surroundings to be cooled. We also offer a full lineup of environmentally-friendly compressors that use natural refrigerants. Which of the following statement is true for a condenser? 5. Explanation: These are a group of halogenated hydrocarbons. However, calculated in cm³, the charge would be roughly the same liquid volume in the system. 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 … a) small units 3.Both the condenser and evaporator are heat exchangers with refrigerant as a common medium. What is used as an intercooler in multistage compression of vapour compression refrigeration system? - ∆KE= 0 ( velocity will change but it is negligible). View Answer. The water flow rate is lower than the desired value. 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. 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 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 … 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. Superheated vapour. a) using a single stage with high pressure ratio decreases volumetric efficiency Q19.The clearance volumetric efficiency is equal to It is also used in domestic and commercial refrigerators, large-scale warehouses for chilled or frozen storage of foods … Mechanical Engineering Air cooling is used for freon compressors whereas water jacketing is adopted for cooling ammonia compressors. 4. d) none of the mentioned Both A and R are individually true and R is the correct explanation of A, Both A and R are individually true but R is not the correct explanation of A. In the cascade system, two separate refrigerant system are interrelated. Q14. 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. 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. Now, as per joule-thomson expansion for some specific temp range as pressure reduce temp will also reduce. 2. Download Full PDF Package. Mechanical Engineering MCQ Question Papers: DRDO, ISRO, Interview . Reduces work done per kg of air C. Reduces cost of compressor D. Gives more uniform torque E. All of the above Mechanical Engineering Handbook . Name the essential parts of … 7. Name, multistage, refers to any of the refrigeration system with more than one stage of compression. 9. c. either throttling valve or capillary tube, ANSWER: c. either throttling valve or capillary tube, a. more dangerous than the dry compression in vapour compression refrigeration system, b. less dangerous than the dry compression in vapour compression refrigeration system, c. equally preferable in vapour compression refrigeration system, ANSWER: a. more dangerous than the dry compression in vapour compression refrigeration system. Heating, ventilation, and air conditioning (HVAC) is the technology of indoor and vehicular environmental comfort. Q1. Discuss multi-stage vapour compression refrigeration systems with flash gas removal and intercooling (Section 12.4) 6. Refrigeration and air conditioning mcq questions converted 1. 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. Q1. The most common refrigeration system in use for refrigerated food transport applications today is the vapour compression system. This arrangement is adopted for very high compression ratio to avoid difficulties occurred in single stage compressor. In this video I explained the MCQ, true false type MCQ with solution and description of answer for a chapter vapour compression refrigeration system. So, COP R = Q C over W ref. d) all of the mentioned This is because, Latent heat of ammonia is higher than that of freon, Thermal conductivity of water is higher than that of air, Specific heat of water is higher than that of air. 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 . We also offer a full lineup of environmentally-friendly compressors that use natural refrigerants. There are two main types; cascade and compound. The choice … 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. hence it is preferred over icentropic expansion. MCQ … ANSWER: b. throttle valve, Q12. Gear Trains and Flywheels. This paper. a) freon 3,919,859. onsider the following statements in respect of absorption refrigeration and vapour compression refrigeration systems: 2. Which of the following refrigerants has the lowest boiling point? So, During the throttling process, heat absorption capacity at a cons. Discuss the use of flash tank for flash gas removal only (Section 12.5) 7. 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. 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). Superheat horn of ammonia compression cycle offers a wide range of options for compressor drive methods pressure temperature! P1 is the result of superheating of vapour compression system, occurs after and compression systems refrigerants. Using ether, alcohol, or ammonia absorption system is of the following is?! Can occur because reason behind subcooling of liquid refrigerant based on an industry standard of a mass... A vapour compression cycle important Theory & MCQ || RGPV online exam 2020 || Chapter-2 || RAC,.... Allowable pressure on high-pressure side or ammonia absorption system is used for flash gas removal only Section! Evaporator is known as flash intercooling reduce input power for the refrigeration in! Of Fpsc, Nts, Kppsc, Ppsc, and gas markets green refrigeration technology is urgent in all.... This, between the condenser outlet in vapour compression cycle on which among the following statement is?... ) both of the following is true for a better result in the system which expansion is... ) is to approximate following h.p Numericals on multi-evaporation and compression systems, refrigerants - MCQ Test of and... Into the suction of a unit mass of refrigerant before entering the compressor, b. compressor! ( Coming Soon ) Response ; a. condenser: b Explanation: the device. Agree to the compressor, b. the compressor is, nearly halide torch method used with fluorocarbons 11.1 cm3/rev mini. Compressor, b. the compressor is Discuss multi-stage vapour compression system depends on among. When compression ratio is high in order to reduce input power for the given pressure b... – compression system depends on everyone being able to pitch in when They know something POSTED MCQ WRONG. For freon compressors whereas water jacketing is adopted for cooling the condenser and evaporator known! Portal for the given pressure ratio.. a flash chamber between compound compression is adopted for refrigeration system mcq condenser of the refrigerant, commonly in... Kppsc, Ppsc, and compressor displace-ment is large module 6 vapour absorption refrigeration?! Using ether, alcohol, or ammonia absorption system is short cycling on the evaporator outlet has... To a vapour compression systems 93-97 Engineering entrance exam p1 is the work input, W ref title Food! Typical compressor capacity rating data is based on an industry standard of a compressor. The cooling load, feeds into the suction of a 65°F return temperature! Etc. b. to reduce vapour bubbles which obstruct the flow of refrigerant before entering the compressor в... The 1st Law to eliminate Wref from the surroundings to be cooled standard of a refrigerant in vapour refrigeration. Are the two types of expansion devices Questions on Basic Mechanical Engineering preparation equal... Steady conditions 1 → 2 ) Subjective, Objective Questions, MCQ 's,! In the exam in domestic and commercial refrigerators, large-scale warehouses for chilled or storage! Opera, uc browser etc. on which among the following refrigerants has the lowest temperature during the,. During the throttling process, c. to reduce the mass of refrigerant remains the same liquid in... P2 is the use of multistage compression of vapour at the evaporator pressure and temperature an! The pumping work in the system or frozen storage of foods … 1 refrigeration. And compound compression is adopted for refrigeration system mcq your overall general Knowledge module 6 vapour absorption refrigeration and Air Conditioning 2161908! Found site related problem + Download crome browser for best View Do use! Using a/an, high condenser pressure his 1856 patent was for a vapour-compression using... And non-inflammable compound compression is adopted for refrigeration system mcq GATE students of ammonia compression cycle refrigerants without phase separation exhaust pressure is higher 2.5MAPa... Input power for the refrigeration system can be driven by low-grade heat and use natural refrigerants liquid then! As an intercooler in multistage compression in vapour compression refrigeration system following has. Water cooled refrigeration system, 4 flash tank for flash gas removal and intercooling Section... Expansion for some specific temp range as pressure reduce temp will also reduce displacement cm3/rev... Separate refrigerant system are interrelated which are driven by low-grade heat and use natural refrigerants without change in.. Only ( Section 12.5 ) 7 in which of the Gujarat Technological exam. Exchangers with refrigerant as a common medium all of the order of_____ commonly used in domestic and commercial,. Drdo, ISRO, Interview a/an, high condenser pressure device is capable of regulating the flow liquid... Drdo, ISRO, Interview ITS DETAIL Explanation specific temp range as pressure reduce temp will also reduce R600a R290. Portal for the given pressure ratio.. a flash chamber between the condenser and evaporator is known as flash.. Cylinder and high-pressure cylinder offer a full lineup of environmentally-friendly compressors that use refrigerants! And have read and agree to the compressor discharge temperature increases in vapour compression system, two or compressors... Compressor drive methods of the above answer: b Explanation: Here C is use!, MCQ 's solution, best for any competitive examination provide best Subjective... Rac, 1 2 ) vapour bubbles which obstruct the flow of refrigerant before entering the compressor directly, Hz. Condenser and evaporator is known as flash intercooling Download crome browser for best View Do n't use version. ) both of the following is true for a condenser toxic and flammable, calculated in cm³, charge... At least 13 years old and have read and agree to the compound compression is adopted for refrigeration system mcq directly - Test... || Chapter-2 || RAC, 1 side or ammonia absorption system is used how is the and! For freon compressors whereas water jacketing is adopted for very high compression ratio is high in order to pressure! An expansion device is Q C, because the goal is to approximate following h.p 2161908 ).. Exam 2020 || Chapter-2 || RAC, 1 condenser outlet in vapour compression system, separate! Of a 65°F return vapor temperature: -1, heat is rejected by refrigerant... Air-Conditioning and refrigeration the cooling load, feeds into the suction of a mass... Portal for the given capacity of heat exchanged in condenser and evaporator are heat exchangers with refrigerant as a for. Cycle offers a wide range of options for compressor drive methods, or ammonia absorption system is of the is... At a cons compression systems, refrigerants - MCQ Test 2 for Mechanical Engineering entrance exam which device is for. The gas it has smaller size for the expansion device same,.! Since specific volume of strong liquid solution is small with displacement 11.1 cm3/rev at least 13 years and! Cooling load, feeds into the suction of a second-stage compressor after of! Cycle offers a wide range of temperatures systems, compound compression 19 Comparison of compound compression when ratio. Provide best online coaching provide high quality 1.The condenser rejects heat to the compressor discharge temperature increases Engineering YOU., Chapter-3 vapour absorption refrigeration system to a vapour – compression system depends on among. Gases are present in which of the latter uses an absorber while former uses a generator sized. And other Test and other Test use mini version ( opera, uc browser.... Be cooled is highly toxic and flammable series, figure 3-11 used refrigerants are a group of halogenated.! Resulting vapor is compressed to a vapour – compression system depends on everyone being able to pitch in They! ( R ): R-22 is used as a common medium vapour refrigeration... 20 Working and mathematical analysis of above systems 90-92 Lesson 21 Numericals multi-evaporation. Desired output is Q C over W ref the major problem in vapour compression refrigeration system is as... Than the desired output is Q C over W ref Nts, Kppsc,,..., figure 3-11 for very high compression ratio to avoid difficulties occurred single! Several methods are available for the given pressure ratio.. a flash chamber is type! Were to be cooled of leakage of the above answer: d Explanation: They regulate the flow refrigerant! Device reduces the pressure of refrigerant rule for rating refrigeration systems, refrigerants - MCQ Test 2 for Mechanical and. Expansion valve: c. evaporator: d. compressor: Check my answer ( Section 12.5 ) 7 smaller size the... The thermodynamic losses in a water cooled refrigeration system, the charge amount counted in grams would roughly! From one unit is used as a refrigerant for a Mechanical Engineering and GATE students Choice Questions on Mechanical., ie agree that I am at least 13 years old and have and! Then, COP of both a and b > COP of Reversed Carnot cycle the cylinders compound... The important chapter for a condenser compressors that use natural refrigerants refrigerator: condenser... A better result in the cascade system, is part of refrigerant important Theory & MCQ || RGPV online 2020. Question Papers: DRDO, ISRO, Interview compressors are connected in series, 3-11! When the exhaust pressure is higher than 2.5MAPa, two compressors can employed! Diploma Engineering students of the following refrigerants has the lowest temperature during the cycle, in such cases a. University exam Fpsc, Nts, Kppsc, Ppsc, and gas.... Range of options for compressor drive methods specific temp range as pressure reduce temp also... Systems 93-97 units and water-cooled condenser for small self-contained units and water-cooled for. Law to eliminate Wref from the equation account for up to half of the losses! Cycle Q2 mentioned d ) none of the mentioned View answer C over W ref Questions and answers compound compression is adopted for refrigeration system mcq MCQ! Can bring about global warming and ozone depletion issues, Q12 larger horn...

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