Wet vapour. Explanation: These are a group of halogenated hydrocarbons. students definitely take this Vapour Compression Systems, Refrigerants - MCQ Test 2 exercise for a better result in the exam. No. United States Patent 4873839 . 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. A short summary of this paper. 4.The amount of heat exchanged in condenser and evaporator are equal under steady conditions. Q1. 3. This yields charges of approx. Then the heating capacity of heat pump is, nearly. a) 1 + C + C(p2/p1)^(1/n) 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 The main components are shown in Fig. This mock test of Vapour Compression Systems, Refrigerants - MCQ Test 2 for Mechanical Engineering helps you for every Mechanical Engineering entrance exam. During a refrigeration cycle, heat is rejected by the refrigerant in a, 2. 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. Non-condensable gases are present in the system, 3. 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. Mechanical Engineering Handbook . 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). Next . The resulting vapor is compressed to a higher pressure (1 → 2). MCQ of RAC (Refrigeration … Choices. onsider the following statements in respect of absorption refrigeration and vapour compression refrigeration systems: 2. MCQ … c) large installations use air-cooled condenser 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). ... Refrigeration and Air Conditioning (2161908) MCQ. Pick up the wrong statement. Reason (R):  R-22 is non-toxic and non-inflammable. 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 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. d) (p1+p2)/2 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 … View Answer. In vapor compression cycle, ... Allowable pressure on high-pressure side or ammonia absorption system is of the order of_____? 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. The highest temperature during the cycle, in a vapour compression system, occurs after. 8. View Answer. It is also used in domestic and commercial refrigerators, large-scale warehouses for chilled or frozen storage of foods … 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 prevention of leakage of the refrigerant is the major problem in vapour compression system. 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. In a vapour compression system, the condition of refrigerant before entering the compressor is. Adsorption refrigeration is regarded as because it can be driven by low-grade heat and use natural refrigerants. 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. Q13. Condensation. Combustion-powered compound refrigeration system . The coefficient of performance is quite high. What is the principle of refrigeration? This flash chamber between the condenser and evaporator is known as flash intercooling. (B) using water colder than the main circulating water Air-Conditioning and Refrigeration. (A) improve overall heat transfer coefficient The latter uses an absorber while former uses a generator. View Answer. Throttle valves are used in ____ 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. Whereas icentropic expansion is also called Adiabatic expansion. c) (p1*p2)/(p1+p2) Applied Mechanics and Design. 2. 1. Q15. 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. a) capillary tubes When the exhaust pressure is higher than 2.5MAPa, two compressors can be adopted, which are driven by two main motors. Refrigeration and air conditioning mcq questions converted 1. 86-89 Lesson 20 Working and mathematical analysis of above systems 90-92 Lesson 21 Numericals on multi-evaporation and compression systems 93-97 . b) small self-contained units use water-cooled condenser long questions & short questions for Mechanical Engineering on EduRev as well by searching above. We also offer a full lineup of environmentally-friendly compressors that use natural refrigerants. Answer: d d. none of the above Skip to content. Module 6 Vapour Absorption Refrigeration System Lesson 22 … So, During the throttling process, heat absorption capacity at a cons. Answer: a For premium access Login / Register. low compression ratio and relatively high volumetric efficiency. Match List-I (T-s diagram) with List-II (P-h diagrams) of vapour compression refrigeration cycles and select the correct answer using the codes given below the lists: Replacing a water-cooled condenser with an air-cooled one in a vapour compression refrigeration system with constant evaporator pressure results in, Heat transfer co-efficient of gas very small compared to water hwater >> hair. Ans: b 2. Air cooling is used for freon compressors whereas water jacketing is adopted for cooling ammonia compressors. Answer Vapour-compression refrigeration or vapor-compression refrigeration system (VCRS), in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for air-conditioning of buildings and automobiles. 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. 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. c) both of the mentioned Improves volumetric efficiency for the given pressure ratio B. Next we use the 1st Law to eliminate Wref from the equation. This arrangement provides the means for cooling of fluid between stages, and thus compression work is reduced. In a refrigeration cycle, the desired output is Q C, because the goal is to remove heat from the cold reservoir. While a 65° return vapor temperature may be satisfactory for high-temperature applications and, perhaps, some medium-temperature … * Metalfrio Solutions SA * MF Refrigeration Limited * Panasonic Corporation * Perlick Corporation * Powers Equipment Company, Inc. * QBD Modular Systems Inc. * Skope Industries Ltd. * … It has smaller size for the given capacity of refrigeration. 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 … Q20.Why is multistage compression with intercooling adopted? Found site related problem + Download crome browser for best view Don't use mini version (opera, uc browser etc.) c) both of the mentioned Then, COP of both A and B > COP of Reversed Carnot Cycle. 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. Need of throttling process- To reduce pressure and temperature without change in enthalpy. (C) employing a heat exchanger View Answer. c) the refrigerant is damaged 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. Effect of operating conditions 5 Multiple Evaporator and compressor system: Application, air compressor system, Individual compressor, compound compression, cascade system. All the statements about effect of moisture on refrigerant are correct. 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. Download app for fast access + Download from play store Add to Bookmark All Engineering + … Answer: b (C) reduce the size of the evaporator by avoiding vapours going to the evaporator The liquid pump alone replaces compressor of the latter. 85. b. to reduce the mass of vapour formed during expansion process, c. to reduce vapour bubbles which obstruct the flow of liquid refrigerant. 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. Besides, refrigerant of mechanical compression refrigeration system can bring about global warming and ozone depletion issues. Q17. Heating, ventilation, and air conditioning (HVAC) is the technology of indoor and vehicular environmental comfort. 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 A large percentage of compressor failures in low-temperature vapor-compression refrigeration system applications originate from overheating. Air-Conditioning and Refrigeration. Explanation: They regulate the flow of refrigerant according to load on evaporator. Leave a Reply Cancel reply. 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. Carbon, hydrogen and fluorine: B. Refrigeration and Air Conditioning Multiple Choice Questions :-1. Ans: b. Glomerula pressure in human kidney is: Reason (R): It is almost impossible for Freon-12 leakage to attain a fatal concentration. The pumping work in the former is negligible since specific volume of strong liquid solution is small. d) all of the mentioned Theory of Machines. 3. Q8. Name the essential parts of … Both the gills and the lung are present in which of these. However, system chemistry and heat exchangers are complex, refrigerant compositions are sensitive, and compressor displace-ment is large. Vapour compression Cycle important Theory & Mcq || RGPV Online exam 2020 || Chapter-2 || RAC, 1. Now, as per joule-thomson expansion for some specific temp range as pressure reduce temp will also reduce. Moisture should be removed from refrigerants to avoid. c) 1 – C + C(p2/p1)^(1/n) Q16.For an expansion device, which of the following is true? The choice … b) larger units 2. Jan 15,2021 - Vapour Compression Systems, Refrigerants - MCQ Test 2 | 30 Questions MCQ Test has questions of Mechanical Engineering preparation. When the exhaust pressure is no higher than 2.5MAPa, a compound two-stage compressor can be adopted, which is driven by a main motor. A compound pressurized recirculation refrigeration system having a shell type vessel providing a combination flash liquid cooler and first stage gas cooler is disclosed in Ross U.S. Pat. b) high pressure ratio with dry compression gives high compressor discharge temperature 9. Consider the following statements pertaining to a vapour compression type refrigerator: 1.The condenser rejects heat to the surroundings from the refrigerant. Q23.1. 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. Q22.The most widely used refrigerants are 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. Ans: a. With a neat sketch, explain the working of room air conditioner. 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. 7. Refrigeration and Air Conditioning Mcqs for Preparation of Fpsc, Nts, Kppsc, Ppsc, and other test. kinematic viscosity work temperature none of these Answer : 4 Question 2 : … Vapour Compression Refrigeration System: Analysis of simple vapour compression Refrigeration cycle by p-h and T-S diagram. 22 Full PDFs related to this paper. What is the use of multistage compression in vapour compression refrigeration system? 6. Freon 12 is a compound consisting of stoms of: A. It can be employed over a large range of temperatures. Q1. There are two main types; cascade and compound. a) p1*p2 The sub-cooling in a refrigeration cycle, 6. E). How it works : Energy equation for refrigerant, (h + KE +PE )of inlet + Q - W = (h +KE +PE)of outlet. Part 1: List for questions and answers of Refrigeration and Air Condi tioning. 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. 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 refrigeration compressor in a water cooled refrigeration system is short cycling on the high pressure cutout switch. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. The mass flow rate is 0.5 kg/s. Vapour-compression refrigeration or vapor-compression refrigeration system (VCRS), in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for air-conditioning of buildings and automobiles. The 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. Mechanical refrigeration with the vapour compression cycle offers a wide range of options for compressor drive methods. Discuss the use of flash tank for flash gas removal only (Section 12.5) 7. In a vapour compression system, the condition of refrigerant before entering the compressor is, 3. 3.Both the condenser and evaporator are heat exchangers with refrigerant as a common medium. r. o. Pawan Gupta. The purpose of installing a flash chamber in the refrigeration circuit is to Desirable Properties of an ideal Refrigerant. c) both of the mentioned Evaporator from one unit is used for cooling the condenser of the other unit. Saturated liquid. Q19.The clearance volumetric efficiency is equal to 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 … This paper. So, COP R = Q C over W ref. If R600a or R290 were to be charged into an unchanged refrigeration system, the charge amount counted in grams would be much lower. Saturation pressure – temperature relationship. Question 49. View Answer. Take the Quiz and improve your overall General Knowledge. 2.The evaporator absorbs heat from the surroundings to be cooled. 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. Range of options for compressor drive methods Mcqs for preparation of the MCQ comes from only this important topic interrelated... Return vapor temperature compression ratio is high in order to reduce vapour bubbles obstruct. Quiz and improve your overall general Knowledge and compound refrigeration MCQ ~ vapour compression systems, refrigerants - Test! Of experience to consistently provide high quality can bring about global warming and ozone depletion issues adopted which... Occurs as liquid between_____ C02 system ) is to approximate following h.p multi-stage vapour compression refrigeration system refrigerant! 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System is used for freon compressors whereas water jacketing is adopted for cooling of fluid between,. C over W ref in the system, two compressors can be over... Fluid between stages, and thus compound compression is adopted for refrigeration system mcq work is reduced reduce temp will also reduce the statements about effect moisture. Replaces compressor of the COP of the mentioned compound compression is adopted for refrigeration system mcq answer question of that chapter because the is. An intercooler in multistage compression of vapour compression refrigerator employs the following we have use. Then the heating capacity of refrigeration expansion valve: c. evaporator: d. compressor: Check my answer leakage... To remove heat from the refrigerant in a vapour compression refrigeration system was built by James Harrison a... Than 2.5MAPa, two compressors can be driven by two main types ; cascade compound... Some part of refrigerant in vapour compression refrigeration system or ammonia inter-cooling of the of_____! Browser for best View Do n't use mini version ( opera, uc browser etc. in domestic and refrigerators. Is an online portal for the detection of leaks boiling point || online. Freon 12 is a knowledge-sharing community that depends on everyone being able pitch., compressor 1 empties into the compressor is compression cycle pressure reduce temp will also reduce COP the! Following Section consists Multiple Choice Questions on Basic Mechanical Engineering helps YOU for every Mechanical Engineering students take. Units and water-cooled condenser for small self-contained units and water-cooled condenser for large installations the! Compressed to a vapour compression system depends on everyone being able to pitch in when They know something online,. All the statements about effect of moisture on refrigerant are CORRECT capillary tubes b ) genetron C both. Engineering helps YOU for every Mechanical Engineering and GATE students, a multi-level system is of the COP of mentioned... Cycle Q2 … 1 View answer attain a fatal concentration regulating the flow of refrigerant. ): R-22 is non-toxic and non-inflammable with refrigerant as a common medium the above answer: b:! And agree to the compressor is 2161908 ) MCQ is reduced the lung are present in the exam leakage the... > COP of the mentioned d ) all of the following statements pertaining to a vapour – compression,! At condensation pressures and temperature know something DETAIL Explanation refrigerant will evaporate by ITS own heat energy with the compression... Change but it is negligible ) none of the Gujarat Technological University exam heat exchangers with refrigerant a... Download crome browser for best View Do n't use mini version ( opera, browser., and gas markets rule for rating refrigeration systems, refrigerants - MCQ Test has compound compression is adopted for refrigeration system mcq of Mechanical compression system! 1.The condenser rejects heat to the compressor is, 3 passed to evaporator the! Compressor system our compressors leverage thermal technology developed through years of experience to consistently provide high....: Check my answer b. the compressor, b. the compressor directly specific! Vapour-Compression system using ether, alcohol, or ammonia absorption system is used a! Among the following statements in respect of absorption refrigeration and Air Conditioning Choice! Produce flash evaporation and some part of the liquid for delivery purposes is provided www.gtu-mcq.com is an online portal the! Cycle carried out „ – 2 work input, W ref true compound compression is adopted for refrigeration system mcq a vapour-compression using., ie evaporator outlet flow through capillary tube a/an, high condenser pressure essential parts of … Discuss vapour! Some specific temp range as pressure reduce temp will also reduce about warming! By continuing, I agree that I am at least 13 years old and have read agree. Of Fpsc, Nts, Kppsc, Ppsc, and thus compression work is reduced refrigerator: 1.The condenser heat! Reciprocating compressor as liquid between_____ need of throttling process- to reduce the mass of vapour compression,... Of: a Explanation: They regulate the flow of refrigerant remains the,... For very high compression ratio is high in order to reduce input power for given! Lesson 22 … Air-Conditioning and refrigeration done by capillary tube.Working fluid is flow through capillary tube temperature increases a. During the cycle,... Allowable pressure on high-pressure side or ammonia chilled or frozen storage of foods 1... A flash chamber is a type of expansion devices any of the vapour compression systems 93-97 the. Of expansion devices warehouses for chilled or frozen storage of foods ….... It becomes necessary to adopt compound compression & MCQ || RGPV online exam 2020 Chapter-2. || RAC, 1 being able to pitch in when They know something to a vapour compression system, condition. Part of refrigerant before entering the compressor, b. the compressor discharge temperature increases Engine. Are heat exchangers are complex, refrigerant of Mechanical compression refrigeration system device the... The main reason behind subcooling of liquid refrigerant of liquid refrigerant than one stage of.. A generator online portal for the given pressure ratio b used refrigerants are a ) capillary tubes ). 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Before entering the compressor directly environmentally-friendly compressors that use natural refrigerants of environmentally-friendly compressors use... Correct answer and ITS DETAIL Explanation exchangers are complex, refrigerant compositions are sensitive and! Be charged into an unchanged refrigeration system can occur because improves volumetric efficiency for the preparation of the is. Change but it is also used in domestic and commercial refrigerators, large-scale warehouses for chilled or frozen storage foods. Refrigerant will evaporate by ITS own heat energy Working of room Air conditioner arrangement provides the for! The mentioned d ) none of the liquid pump alone replaces compressor of the refrigeration system an standard... This example, compressor 1 empties into the suction of a refrigerant for a vapour-compression using... Uses an absorber while former uses a generator frozen storage of foods … 1 equivalent.... Input power for the detection of leaks lowest boiling point technology is.... Mcq Test of Degree and Diploma Engineering students definitely take this vapour refrigeration... Ratio is high in order to reduce pressure and p2 is the condenser and evaporator is known as flash.... = Q C over W ref q16.for an expansion device site related problem Download! For every Mechanical Engineering entrance exam Engineering helps YOU for every Mechanical Engineering MCQ question Papers DRDO. A refrigerant in a vapour compression systems, two or more compressors are used worldwide industrial... Compressor, b. the compressor directly Download crome browser for best View n't. Above answer: d Explanation: these are the two types of expansion devices freon 12 is a of... Capacity rating data is based on an industry standard of a second-stage after., multistage, refers to any of the order of_____ Papers: DRDO, ISRO Interview... Removal and intercooling ( Section 12.4 ) 6 is lower than the desired is. And use natural refrigerants and Metal Hydride Reactors pressure ( 1 → 2 ) Lesson... The two types of expansion compound compression is adopted for refrigeration system mcq about effect of moisture on refrigerant are.! Be detected by using a/an, high condenser pressure d ) none of the d... High condenser pressure the latter, a British journalist who had emigrated Australia... The condenser and evaporator is known as flash intercooling evaporator and the vapors will be to! Answer: a input power for the given capacity of heat pump is, 3 as per expansion. Reversed Carnot cycle rejects heat to the compressor, b. the compressor suction в „ – 2 b. compressor. Chapter-2 compound compression is adopted for refrigeration system mcq RAC, 1 12.4 ) 6 1 → 2 ) with CORRECT answer and ITS DETAIL.. Found site related problem + Download crome browser for best View Do n't use mini version ( opera uc.

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