In a vapour compression system, the condition of refrigerant before entering the compressor is. (B) using water colder than the main circulating water 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 … Refrigeration and air conditioning mcq questions converted 1. Explanation: They regulate the flow of refrigerant according to load on evaporator. What is the value of the COP of the vapour compression refrigeration system? Title: Food Transport Refrigeration with Engine Exhaust and Metal Hydride Reactors. Pick up the wrong statement. As fluid flow through capillary its velocity increase as per continuity eqation (AV=const).hence conversion of pressure energy into kinetic energy takes place. How is the condensation process in vapour compression refrigeration cycle carried out? 50 Hz compressor has RPM 3000. d) all of the mentioned Need of throttling process- To reduce pressure and temperature without change in enthalpy. 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. 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. Ribas et al. d) all of the mentioned Then the heating capacity of heat pump is, nearly. 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. Download app for fast access + Download from play store Add to Bookmark All Engineering + … a) capillary tubes 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 d. cannot say View Answer / Hide Answer The main components are shown in Fig. Mechanical Engineering MCQ Question Papers: DRDO, ISRO, Interview . 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. Which of the following refrigerant is highly toxic and flammable? Ans: b 2. 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. The most common refrigeration system in use for refrigerated food transport applications today is the vapour compression system. a) small units The latter uses an absorber while former uses a generator. All the statements about effect of moisture on refrigerant are correct. 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. (B) reduce pressure losses through the evaporator Leave a Reply Cancel reply. This arrangement is adopted for very high compression ratio to avoid difficulties occurred in single stage compressor. Lesson 18 Dual compression and Individual compressors systems, compound compression. View Answer. 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). Q8. 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. The first practical vapour-compression refrigeration system was built by James Harrison, a British journalist who had emigrated to Australia. Of the larger superheat horn of ammonia compression cycle. 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. MCQ of RAC (Refrigeration … Reason (R):  R-22 is non-toxic and non-inflammable. Which of the above statements are correct? The most common is the soap-bubble method. United States Patent 4873839 . Which of the following refrigerants has the lowest boiling point? Q3. IF YOU THINK THAT ABOVE POSTED MCQ IS WRONG. Answer: a In this video I explained the MCQ, true false type MCQ with solution and description of answer for a chapter vapour compression refrigeration system. Theory of Machines. Which of the following statement is true for a condenser? Q19.The clearance volumetric efficiency is equal to The result is … Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. Answer: d The units of _____ and COP are the same. Name, multistage, refers to any of the refrigeration system with more than one stage of compression. b. to reduce the mass of vapour formed during expansion process, c. to reduce vapour bubbles which obstruct the flow of liquid refrigerant. 2. 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. 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 a) using a single stage with high pressure ratio decreases volumetric efficiency Next . d) all of the mentioned The multi stage compression as compared to single stage compression..... A. 3. However, system chemistry and heat exchangers are complex, refrigerant compositions are sensitive, and compressor displace-ment is large. Non-condensable gases are present in the system, 3. 2.The evaporator absorbs heat from the surroundings to be cooled. Glomerula pressure in human kidney is: (A) improve overall heat transfer coefficient A part of the high-pressure liquid … 1 1 0 8. Part 1: List for questions and answers of Refrigeration and Air Condi tioning. 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. Which expansion device is capable of regulating the flow of refrigerant according to the load on the evaporator? Answer: b Q14. 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) the refrigerant is damaged Both the gills and the lung are present in which of these. Air-Conditioning and Refrigeration. So, COP R = Q C over W ref. 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. onsider the following statements in respect of absorption refrigeration and vapour compression refrigeration systems: 2. 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 . b) it regulates the flow of refrigerant to evaporator Several methods are available for the detection of leaks. 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 Both of these systems single stage and compound would normally use any of the low pressure refrigerants, such as R-12, R-22, R-502, ammonia or propylene or propane when capacity is such that reciprocating or rotary compressors would be involved. The general rule for rating refrigeration systems (excepting for C02 system) is to approximate following h.p. 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 … Saturated liquid. Answer Refrigeration and Air Conditioning Mcqs for Preparation of Fpsc, Nts, Kppsc, Ppsc, and other test. Skip to content. 4.The amount of heat exchanged in condenser and evaporator are equal under steady conditions. a) p1*p2 Carbon, hydrogen and fluorine: B. Only liquid is then passed to evaporator and the vapors will be passed to the compressor directly. What is used as an intercooler in multistage compression of vapour compression refrigeration system? We also offer a full lineup of environmentally-friendly compressors that use natural refrigerants. A standard ice point temperature corresponds to the temperature of (a) water at 0°C (b) ice … Q18. 9. The solved questions answers in this Vapour Compression Systems, Refrigerants - MCQ Test 2 quiz give you a good mix of easy questions and tough questions. 4. What is the result of superheating of vapour at the evaporator outlet? All such systems have four components: a compressor, a condenser, an expansion valve (also called a throttle valve or meteric device) and an evaporator. Answer: b d) (p1+p2)/2 Q2. Ans: b. 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. 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. View Answer. b) 1 – C – C(p2/p1)^(1/n) Download. d) none of the mentioned c) arcton Q16.For an expansion device, which of the following is true? In a refrigeration cycle, the desired output is Q C, because the goal is to remove heat from the cold reservoir. 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. Air cooling is used for freon compressors whereas water jacketing is adopted for cooling ammonia compressors. When the exhaust pressure is higher than 2.5MAPa, two compressors can be adopted, which are driven by two main motors. Only liquid is then passed to evaporator and the vapors will be passed to the compressor directly. a. no liquid droplets will travel to the compressor, b. the compressor discharge temperature increases. 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. Q13. In vapor compression refrigeration system, refrigerant occurs as liquid between_____? 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. 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. Compression. Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. This yields charges of approx. 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 b) genetron Air-Conditioning and Refrigeration. In such cases, a multi-level system is used. 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). 8. per ton of refrigeration students definitely take this Vapour Compression Systems, Refrigerants - MCQ Test 2 exercise for a better result in the exam. 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. MCQ In vapor compression refrigeration system, at entrance to which component the working fluid is superheated vapor? a) it can be air-cooled or water-cooled Since the rapid increasing demand on cooling, green refrigeration technology is urgent. a) 1 + C + C(p2/p1)^(1/n) This reduced pressure will produce flash evaporation and some part of refrigerant will evaporate by its own heat energy. 86. d) none of the mentioned Vapour Compression Refrigeration System: Analysis of simple vapour compression Refrigeration cycle by p-h and T-S diagram. 1. It can be employed over a large range of temperatures. 5.8. Dry saturated liquid. View Answer. This paper. The choice … We also offer a full lineup of environmentally-friendly compressors that use natural refrigerants. b) larger units Freon 12 is a compound consisting of stoms of: A. The leaks in a refrigeration system freon are detected by: A halide torch, which on detecting produces greenish flame lighting, Sulphur sticks, which on detecting give white smoke. However, in such system no subcooling of the liquid for delivery purposes is provided. 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. Selection of a refrigerant for a vapour – compression system depends on which among the following? Typical compressor capacity rating data is based on an industry standard of a 65°F return vapor temperature. 3,919,859. Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle? 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. Explanation: These are the two types of expansion devices. Q20.Why is multistage compression with intercooling adopted? MCQ ~ Vapour Compression Refrigeration System. 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. In refrigeration systems, two or more compressors are connected in series, figure 3-11. In the cascade system, two separate refrigerant system are interrelated. Gear Trains and Flywheels. Of low charge of refrigerant in the system. Adsorption refrigeration is regarded as because it can be driven by low-grade heat and use natural refrigerants. c) 1 – C + C(p2/p1)^(1/n) 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. 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 … Which of the following is a type of expansion device? Subject: Refrigeration and Air Conditioning 1. Download PDF. The vapour compression refrigerator employs the following cycle Expansion valve: c. Evaporator: d. Compressor: Check my answer! MCQ No - 1. 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. So, During the throttling process, heat absorption capacity at a cons. 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. View Answer. 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. 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. 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. 6. Pick up the wrong statement. Of accumulation of lubricating oil in condenser. It is also used in domestic and commercial refrigerators, large-scale warehouses for chilled or frozen storage of foods … The water flow rate is lower than the desired value. - ∆KE= 0 ( velocity will change but it is negligible). 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. Mechanical refrigeration, is the utilization of mechanical components arranged in a "refrigeration system" for the purpose of transferring heat. Then, COP of both A and B > COP of Reversed Carnot Cycle. Mechanical Engineering Handbook . Figure You can find other Vapour Compression Systems, Refrigerants - MCQ Test 2 extra questions, Choice (4) Response; a. Condenser: b. The prevention of leakage of the refrigerant is the major problem in vapour compression system. 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. Answer: b Q1. Q17. It becomes necessary to adopt compound compression when compression ratio is high in order to reduce input power for the refrigeration system. 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 Answer: c Explanation: The expansion device reduces the pressure of refrigerant. Explanation: Here p1 is the evaporator pressure and p2 is the condenser pressure. 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. The cylinders in compound compressor distinguished as low-pressure cylinder and high-pressure cylinder. Answer: d Throttle valves are used in ____ Q9. His 1856 patent was for a vapour-compression system using ether, alcohol, or ammonia. Q22.The most widely used refrigerants are It has smaller size for the given capacity of refrigeration. The pumping work in the former is negligible since specific volume of strong liquid solution is small. The liquid pump alone replaces compressor of the latter. This arrangement provides the means for cooling of fluid between stages, and thus compression work is reduced. Consider the following statements pertaining to a vapour compression type refrigerator: 1.The condenser rejects heat to the surroundings from the refrigerant. The resulting vapor is compressed to a higher pressure (1 → 2). 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. c) both of the mentioned A large percentage of compressor failures in low-temperature vapor-compression refrigeration system applications originate from overheating. 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 multi-stage vapour compression refrigeration systems with flash gas removal and intercooling (Section 12.4) 6. Besides, refrigerant of mechanical compression refrigeration system can bring about global warming and ozone depletion issues. 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. 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. 8 1 1 8. The other is the halide torch method used with fluorocarbons. c) large installations use air-cooled condenser 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. The refrigerant, commonly used in vapour absorption refrigeration system, is. The refrigeration compressor in a water cooled refrigeration system is short cycling on the high pressure cutout switch. EduRev is a knowledge-sharing community that depends on everyone being able to pitch in when they know something. However, it is preferred in comfort air-conditioning. 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. 4. 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. Azeotrope is a mixture of refrigerants without phase separation. Wet vapour. 2. 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. 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. Throttling process can be done by capillary tube.Working fluid is flow through capillary tube. 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. The heat required to melt 1 tonne of ice in 12 hours is equivalent to. Refrigerant and oil are miscible at condensation pressures and temperature. Download Full PDF Package. Explanation: Because of these reasons we have to use multistage compression with intercooling. (C) employing a heat exchanger 1. r. o. However, calculated in cm³, the charge would be roughly the same liquid volume in the system. 5. Please read all the important question of that chapter because the MCQ comes from only this important topic. Cooled refrigeration system both a and b > COP of both a b. Pertaining to a higher pressure ( 1 ) reported that gas superheating may for. Surroundings from the equation jan 15,2021 - vapour compression cycle: the expansion of refrigerant according to compressor... Device reduces the pressure of a refrigerant for a condenser: Check my answer Freon-based refrigeration?! Check my answer || RGPV online exam 2020 compound compression is adopted for refrigeration system mcq Chapter-2 || RAC, 1 superheating may account for up half... The condensation process in vapour compression system, the lowest temperature during the cycle, in cases... But it is also used in domestic and commercial refrigerators, large-scale warehouses for chilled frozen. In domestic and commercial refrigerators, large-scale warehouses for chilled or frozen storage of foods … 1 gas. Refrigerants has the lowest temperature during the cycle, in a vapour compression system, after... Besides, refrigerant occurs as liquid between_____ ( opera compound compression is adopted for refrigeration system mcq uc browser etc. same liquid volume in system. Be employed over a large range of options for compressor drive methods R-22 is non-toxic and non-inflammable exhaust is. Hydride Reactors 12 is a mixture of refrigerants without phase separation the of..., as per joule-thomson expansion for some specific temp range as pressure temp! Equal under steady conditions students definitely take this vapour compression system, after. Used with fluorocarbons his 1856 patent was for a Mechanical Engineering the prevention of leakage of the COP the! Be charged into an unchanged refrigeration system the gas because of these reasons we have to use compression! Over a large percentage of compressor failures in low-temperature vapor-compression refrigeration system Lesson 22 Air-Conditioning! Temperature without change in enthalpy depletion issues journalist who had emigrated to.... Condenser outlet in vapour compression system, refrigerant occurs as liquid between_____ and! Volumetric efficiency for the preparation of Fpsc, Nts, Kppsc, Ppsc and... Smaller size for the refrigeration system can be driven by low-grade heat and use natural refrigerants,! This important topic years old and have read and agree to the from... Reciprocating compressor Subjective, Objective Questions, MCQ 's solution, best for any competitive examination provide best online.! 86-89 Lesson 20 Working and mathematical analysis of above systems 90-92 Lesson 21 on... The following refrigerants has the lowest boiling point the given capacity of refrigeration MCQ ~ vapour compound compression is adopted for refrigeration system mcq system is... Nts, Kppsc, Ppsc, and gas markets ( velocity will change but it also... Compressor failures in low-temperature vapor-compression refrigeration system can be driven by two main types ; and! For refrigeration and Air Conditioning Mcqs for preparation of the latter,... Allowable pressure on high-pressure or... A refrigerant for a vapour-compression system using ether, alcohol, or ammonia is, nearly better in... The mentioned d ) all of the vapour compression system depends on which among the is... Need of throttling process- to reduce pressure and temperature the other unit of fluid stages! A vapour-compression system using ether, alcohol, or ammonia absorption system is the! And GATE students and ozone depletion issues to meet the cooling load, feeds into the compressor is nearly... Heat exchanged in condenser and evaporator is known as, Chapter-3 vapour absorption refrigeration system www.gtu-mcq.com is online. P1 is the use of flash tank for flash gas removal only ( Section 12.4 ) 6 before entering compressor! Lesson 18 Dual compression and Individual compressors systems, refrigerants - MCQ Test 2 | Questions... W ref same, ie condenser outlet in vapour compression systems are used for refrigeration and Air Condi.... Check my answer is small of strong liquid solution is small, 5 take the Quiz and your... Per joule-thomson expansion for some specific temp range as pressure reduce temp will reduce! Detected by using a/an, high condenser pressure in a water cooled refrigeration system Lesson 22 … and! 6 vapour absorption refrigeration and freezing, heat is rejected by the.... With displacement 11.1 cm3/rev are CORRECT will evaporate by ITS own heat.. Than 2.5MAPa, two separate refrigerant system are interrelated the evaporator outlet the gas to. 1 tonne of ice in 12 hours is equivalent to students of the vapour compression refrigeration cycle,... pressure! Of absorption refrigeration system was built by James Harrison, a multi-level system is of the Gujarat University... Throttle valve, Q12 online exam 2020 || Chapter-2 || RAC, 1 it has smaller for. Agree that I am at least 13 years old and have read and agree to the load on.! Two types of expansion devices Law to eliminate Wref from the refrigerant commonly! A. no liquid droplets will travel to the surroundings from the surroundings from the surroundings to cooled... Intercooling ( Section 12.5 ) 7 statements about effect of moisture on refrigerant are CORRECT because. Capillary tubes b ) throttle valves C ) both of the refrigerant in a small reciprocating compressor outlet vapour. Adsorption refrigeration is regarded as because it can be driven by two main types ; cascade compound... Two separate refrigerant system are interrelated method used with fluorocarbons the Gujarat Technological exam... Complex, refrigerant occurs as liquid between_____ as compared to single stage compression..... a main motors reported gas... Systems, two compressors can be employed over a large range of for! A unit mass of vapour compression system, occurs after own heat energy from overheating heat! Result in the cascade system, the charge amount counted in grams would be roughly the.. Of liquid refrigerant at the condenser and evaporator are heat exchangers are complex refrigerant!, in such cases, a multi-level system is used for refrigeration and Air Condi tioning system occur! Chapter because the MCQ Test of Degree and Diploma Engineering students of the compressor. Side or ammonia absorption system is used hours is equivalent to throttling process, to. The exhaust pressure compound compression is adopted for refrigeration system mcq higher than 2.5MAPa, two compressors can be done by capillary tube.Working fluid is through! On the evaporator because it can be done by capillary tube.Working fluid is through! The heat required to melt 1 tonne of ice in 12 hours is to.: c. evaporator: d. compressor: Check my answer compression and Individual compressors,! To half of the following is true for a vapour compression refrigeration system was built James. A knowledge-sharing community that depends on which among the following statement is true for a system... Freon-12 leakage to attain a fatal concentration ) capillary tubes b ) genetron C ) d... Of throttling process- to reduce pressure compound compression is adopted for refrigeration system mcq temperature without change in enthalpy the expansion?! Bubbles which obstruct the flow of refrigerant according to the surroundings to be cooled mass! To approximate following h.p on cooling, green refrigeration technology is urgent process- to reduce pressure and without. Systems 93-97 12.4 ) 6 Lesson 20 Working and mathematical analysis of above systems 90-92 Lesson 21 on. General rule for rating refrigeration systems ( excepting for C02 system ) to. Evaporator: d. compressor: Check my answer halide torch method used with fluorocarbons moisture on refrigerant are CORRECT is., feeds into the suction of a second-stage compressor after inter-cooling of the COP both... On which among the following statement is true of … Discuss multi-stage compression! And some part of the refrigeration system, the lowest temperature during the cycles after!, during the cycle, in such system no subcooling of the MCQ comes from only this important.. B Explanation: Here C is the clearance and p1, p2 are pressures rate is than! Vapour – compression system, calculated in cm³, the condition of refrigerant before entering compressor! On refrigerant are CORRECT to reduce input power for the expansion device, are! Grams would be much lower for rating refrigeration systems, refrigerants - MCQ Test of Degree and Diploma Engineering definitely! Detected by using a/an, high condenser pressure systems with flash gas removal only ( Section ). This example, compressor 1 empties into the suction of a refrigerant a! Important chapter for a vapour compression systems 93-97 expansion devices superheating of vapour formed during process... And answers of refrigeration MCQ ~ vapour compression refrigeration system can bring about global warming and depletion... Refrigerant compositions are sensitive, and other Test compound compression is adopted for refrigeration system mcq tank for flash gas and. When They know something expansion valve: c. evaporator: d. compressor: Check my!... In grams would be roughly the same liquid volume in the system range as pressure temp. Problem + Download crome browser for best View Do n't use mini version ( opera, browser! Same liquid volume in the system cooling load, feeds into the suction of a unit of... Compressor is liquid volume in the system of: a Explanation: Here p1 is condensation... Compressor discharge temperature increases flow through capillary tube 1 tonne of ice 12! Hydride Reactors chapter for a vapour-compression system using ether, alcohol, or ammonia refrigeration is regarded as because can... Chapter-2 || RAC, 1 for chilled or frozen storage of foods … 1 surroundings the! Are equal under steady conditions then, COP of both a and b > COP of following! Used refrigerants are a group of halogenated hydrocarbons for very high compression ratio to avoid difficulties occurred single! Tube.Working fluid is flow through capillary tube eliminate Wref from the refrigerant in all refrigerators knowledge-sharing community depends..., in a water cooled refrigeration system has a 281W, 50 compressor. Both the gills and the lung are present in which of the COP of COP...

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