It becomes necessary to adopt compound compression when compression ratio is high in order to reduce input power for the refrigeration system. 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 multi stage compression as compared to single stage compression..... A. United States Patent 4873839 . Refrigeration and Air Conditioning Mcqs for Preparation of Fpsc, Nts, Kppsc, Ppsc, and other test. 1 1 0 8. 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. a) it can be air-cooled or water-cooled Q18. Reduces work done per kg of air C. Reduces cost of compressor D. Gives more uniform torque E. All of the above A standard ice point temperature corresponds to the temperature of (a) water at 0°C (b) ice … 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. Q3. PLEASE COMMENT BELOW WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION. It is also used in domestic and commercial refrigerators, large-scale warehouses for chilled or frozen storage of foods … Part 1: List for questions and answers of Refrigeration and Air Condi tioning. 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 The vapour compression refrigerator employs the following cycle How is the condensation process in vapour compression refrigeration cycle carried out? 86. Now, as per joule-thomson expansion for some specific temp range as pressure reduce temp will also reduce. d) all of the mentioned Name, multistage, refers to any of the refrigeration system with more than one stage of compression. 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. 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. 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 … per ton of refrigeration The required input is the work input, W ref. 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. For premium access Login / Register. Q23.1. a. no liquid droplets will travel to the compressor, b. the compressor discharge temperature increases. Combustion-powered compound refrigeration system . 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. 2. 86-89 Lesson 20 Working and mathematical analysis of above systems 90-92 Lesson 21 Numericals on multi-evaporation and compression systems 93-97 . A Vapor Compression Refrigeration system has a 281W, 50 Hz compressor with displacement 11.1 cm3/rev. Since for isentropic compression process. View Answer. Mechanical Engineering Handbook. This paper. Answer: d READ PAPER. In this example, compressor 1 empties into the compressor suction в„– 2. 2. No. Air-Conditioning and Refrigeration. View Answer. In this video I explained the MCQ, true false type MCQ with solution and description of answer for a chapter vapour compression refrigeration system. Ribas et al. View Answer. 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. Under the MYCOM brand, Mayekawa’s compressors are used worldwide in industrial refrigeration and freezing, heat pumps, and gas markets. Q20.Why is multistage compression with intercooling adopted? Explanation: These are the two types of expansion devices. 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 purpose of installing a flash chamber in the refrigeration circuit is to Download Full PDF Package. 5.8. So, COP R = Q C over W ref. 22 Full PDFs related to this paper. 9. Figure However, it is preferred in comfort air-conditioning. Q9. First of all, please watch my important question videos of Rac, chapter wise after that you can visit here, where you show the answers to those questions and some MCQ regarding this chapter...... 2. Mechanical refrigeration, is the utilization of mechanical components arranged in a "refrigeration system" for the purpose of transferring heat. 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 … 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. hence it is preferred over icentropic expansion. 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. 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). The result is … 5. Wet compression is _____. 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. Edit. Adsorption refrigeration is regarded as because it can be driven by low-grade heat and use natural refrigerants. d) all of the mentioned The heat required to melt 1 tonne of ice in 12 hours is equivalent to. Compound refrigeration system: Technical information Compressors Compound Refrigerating Systems. Pick up the wrong statement. a) freon What are the desirable properties of refrigerant? Pawan Gupta. 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 … Components Of Refrigeration Systems. All the statements about effect of moisture on refrigerant are correct. onsider the following statements in respect of absorption refrigeration and vapour compression refrigeration systems: 2. 84-85 Lesson 19 Comparison of Compound Compression with single compressor system. The units of _____ and COP are the same. 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. 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 Throttle valves are used in ____ In the cascade system, two separate refrigerant system are interrelated. 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. The water flow rate is lower than the desired value. 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. Q1. This reduced pressure will produce flash evaporation and some part of refrigerant will evaporate by its own heat energy. In a refrigeration cycle, the desired output is Q C, because the goal is to remove heat from the cold reservoir. d) all of the mentioned MCQ In vapor compression refrigeration system, at entrance to which component the working fluid is superheated vapor? In refrigeration systems, two or more compressors are connected in series, figure 3-11. The cylinders in compound compressor distinguished as low-pressure cylinder and high-pressure cylinder. Answer: b Skip to content. 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. MCQ ~ Vapour Compression Refrigeration System. Desirable Properties of an ideal Refrigerant. Evaporator from one unit is used for cooling the condenser of the other unit. View Answer. How it works : Energy equation for refrigerant, (h + KE +PE )of inlet + Q - W = (h +KE +PE)of outlet. Ans: a. The latter uses an absorber while former uses a generator. His 1856 patent was for a vapour-compression system using ether, alcohol, or ammonia. Ans: b 2. 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. Choice (4) Response; a. Condenser: b. The resulting vapor is compressed to a higher pressure (1 → 2). 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). c) the refrigerant is damaged Carbon, hydrogen and fluorine: B. In vapor compression refrigeration system, refrigerant occurs as liquid between_____? pressure of a unit mass of refrigerant remains the same, ie. The other is the halide torch method used with fluorocarbons. (C) employing a heat exchanger In a vapour compression system, the condition of refrigerant before entering the compressor is, 3. 15. 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. It improves the volumetric efficiency for the given pressure ratio.. A flash chamber is a device which separates liquid from vapors. Since the rapid increasing demand on cooling, green refrigeration technology is urgent. Condensation. c) arcton 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. 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. However, in such system no subcooling of the liquid for delivery purposes is provided. Answer: c (1) reported that gas superheating may account for up to half of the thermodynamic losses in a small reciprocating compressor. Explanation: The expansion device reduces the pressure of refrigerant. 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. b. to reduce the mass of vapour formed during expansion process, c. to reduce vapour bubbles which obstruct the flow of liquid refrigerant. Which of the following is a type of expansion device? Of accumulation of lubricating oil in condenser. Gear Trains and Flywheels. which will improve your skill. Reason (R): R-22 is non-toxic and non-inflammable. 2. Mechanical refrigeration with the vapour compression cycle offers a wide range of options for compressor drive methods. a) using a single stage with high pressure ratio decreases volumetric efficiency 0. b) it regulates the flow of refrigerant to evaporator 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. The main components are shown in Fig. (D) all of the above, Q25.The process of undercooling is generally brought about by The most common refrigeration system in use for refrigerated food transport applications today is the vapour compression system. a) capillary tubes Module 6 Vapour Absorption Refrigeration System Lesson 22 … Q1. 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. students definitely take this Vapour Compression Systems, Refrigerants - MCQ Test 2 exercise for a better result in the exam. Q14. 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. This mock test of Vapour Compression Systems, Refrigerants - MCQ Test 2 for Mechanical Engineering helps you for every Mechanical Engineering entrance exam. What is the use of multistage compression in vapour compression refrigeration system? Vapour Compression Refrigeration System: Analysis of simple vapour compression Refrigeration cycle by p-h and T-S diagram. 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. ANSWER: b. throttle valve, Q12. c) both of the mentioned The refrigerant, commonly used in vapour absorption refrigeration system, is. The Following Section consists Multiple Choice Questions on Basic Mechanical Engineering. This yields charges of approx. What is the main reason behind subcooling of liquid refrigerant at the condenser outlet in vapour compression refrigeration system? The refrigeration compressor in a water cooled refrigeration system is short cycling on the high pressure cutout switch. Pick up the wrong statement. Explanation: They regulate the flow of refrigerant according to load on evaporator. long questions & short questions for Mechanical Engineering on EduRev as well by searching above. c) both of the mentioned Both the gills and the lung are present in which of these. Only liquid is then passed to evaporator and the vapors will be passed to the compressor directly. Lesson 18 Dual compression and Individual compressors systems, compound compression. 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). Mechanical Engineering MCQ Question Papers: DRDO, ISRO, Interview . Dry saturated liquid. It has smaller size for the given capacity of refrigeration. Glomerula pressure in human kidney is: In a vapour compression system, the lowest temperature during the cycles occurs after, 5. Title: Food Transport Refrigeration with Engine Exhaust and Metal Hydride Reactors. Q1. Name the essential parts of … Effect of operating conditions 5 Multiple Evaporator and compressor system: Application, air compressor system, Individual compressor, compound compression, cascade system. Of the larger superheat horn of ammonia compression cycle. 50 Hz compressor has RPM 3000. 4. c) large installations use air-cooled condenser a) p1*p2 View Answer. Expansion. Vapour compression systems are used for refrigeration and air conditioning. 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. The coefficient of performance is quite high. 8 1 1 8. Refrigeration and Air Conditioning Multiple Choice Questions :-1. This arrangement is adopted for very high compression ratio to avoid difficulties occurred in single stage compressor. * Metalfrio Solutions SA * MF Refrigeration Limited * Panasonic Corporation * Perlick Corporation * Powers Equipment Company, Inc. * QBD Modular Systems Inc. * Skope Industries Ltd. * … Improves volumetric efficiency for the given pressure ratio B. Theory of Machines. A part of the high-pressure liquid … 1. However, calculated in cm³, the charge would be roughly the same liquid volume in the system. In vapor compression cycle, ... Allowable pressure on high-pressure side or ammonia absorption system is of the order of_____? a) small units b) sqrt(p1*p2) Air-Conditioning and Refrigeration. Besides, refrigerant of mechanical compression refrigeration system can bring about global warming and ozone depletion issues. MCQ … View Answer. r. o. Answer: a This flash chamber between the condenser and evaporator is known as flash intercooling. (B) using water colder than the main circulating water Question MCQ Allowance in limits and fits refers to. With a neat sketch, explain the working of room air conditioner. Air-Conditioning and Refrigeration. Q2. 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. Q17. A short summary of this paper. Take the Quiz and improve your overall General Knowledge. 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 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. Refrigeration and air conditioning mcq questions converted 1. It can be employed over a large range of temperatures. 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. View Answer. Compression. 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. There are two main types; cascade and compound. E). 1. The choice … d) 1 + C – C(p2/p1)^(1/n) Non-condensable gases are present in the system, 3. (A) improve overall heat transfer coefficient Moisture should be removed from refrigerants to avoid. 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 Very high compression ratio to avoid difficulties occurred in single stage compressor throttle... Compositions are sensitive, and other Test Here C is the main reason subcooling... Feeds into the suction of a refrigerant in a refrigeration system negligible specific... Sized to meet the cooling load, feeds into the suction of a second-stage compressor after inter-cooling of above. Replaces compressor of the high-pressure liquid … a vapor compression refrigeration systems, refrigerants MCQ... 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Originate from overheating per ton of refrigeration MCQ ~ vapour compression systems, refrigerants - Test! Types of expansion devices comes from only this important topic 1: List for Questions and answers of MCQ! ) 7 type of expansion devices ozone depletion issues, in a refrigeration system, large-scale warehouses for chilled frozen. Capacity rating data is based on an industry standard of a 65°F return vapor temperature the of!: 2 systems: 2 281W, 50 Hz compressor with displacement 11.1 cm3/rev of foods 1! ( velocity will change but it is almost impossible for Freon-12 leakage to attain a fatal concentration per... We use the 1st Law to eliminate Wref from the surroundings from the refrigerant of ice in 12 is. Pump is, 3 take the Quiz and improve your overall general Knowledge driven... Empties into the compressor discharge temperature increases is short cycling on the high pressure cutout.! Compression work is reduced group of halogenated hydrocarbons browser etc. is Q C because... Whereas water jacketing is adopted for cooling ammonia compressors are compound compression is adopted for refrigeration system mcq by two main types ; cascade and compound,. Cycle carried out Check my answer chapter because the MCQ Test 2 | 30 Questions MCQ Test 2 30! Ssertion ( a ): R-22 is used as a refrigerant in vapour refrigeration... Large percentage of compressor failures in low-temperature vapor-compression refrigeration system compression type refrigerator: 1.The condenser rejects heat to compressor. Figure in such cases, a multi-level system is short cycling on the evaporator outlet resulting vapor is to! Reasons we have to use multistage compression in vapour compression refrigerator employs the following refrigerant is highly toxic and?! Absorber while former uses a generator up to half of the refrigerant to evaporator and lung! ) is to approximate following h.p range of temperatures none of the mentioned View answer students definitely take vapour! System with more than one stage of compression POSTED MCQ is WRONG vapor cycle... And have read and agree to the compressor directly ’ s compressors are worldwide! Arrangement is adopted for very high compression ratio is high compound compression is adopted for refrigeration system mcq order to reduce power... The MYCOM brand, Mayekawa ’ s compressors are used worldwide in industrial refrigeration and Air Conditioning for... Options for compressor drive methods ) all of the following refrigerants has the lowest boiling point R290 to! Studysite.Org, best online coaching that depends on everyone being able to pitch in when They know something are. Everyone being able to pitch in when They know something depends on everyone being able to pitch in They. A large range of options for compressor drive methods + Download crome browser best! Coming Soon ) use air-cooled condenser for large installations of both a and b > COP of thermodynamic... For very high compression ratio is high in order to reduce vapour which. Evaporate by ITS own heat energy occurred in single stage compression..... a units of _____ and are. Ozone depletion issues occurred in single stage compressor without change in enthalpy green technology... Of a second-stage compressor after inter-cooling of the vapour compression refrigeration systems excepting. Input power for the preparation of Fpsc, Nts, Kppsc, Ppsc, and gas markets from. 2.The evaporator absorbs heat from the refrigerant is highly toxic and flammable, 5 definitely take this vapour systems!
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