36.25 on T-S diagram. Sulphur dioxide. MCQ ~ Air Refrigeration Cycles. The term subcooling (also called undercooling) refers to a liquid existing at a temperature below its normal boiling point. The refrigerant, commonly used in vapour absorption refrigeration system, is. This article discusses and defines subcooling, a term used in refrigeration, air conditioning, and heat pump design, installation, & repair. Ans: b 2. 6.0 B. The COP of the cycle is (a) 3.25 (b) 2.16 (c) 3.0 (d) 3.5 (Ans:c) Waste heat can be … In a vapour compression system, the lowest temperature during the cycles occurs after. In this system, the working fluid is a vapor. Now that we have a general idea of what is going on in a running air conditioning system, let’s focus on the outdoor unit and the states of the refrigerant in the condenser coil. Increases C.O.P. Fig.5-5: A 2-stage cascade refrigeration cycle. (pressures: 2 et 9 bar) 5) refrigeration cycle (Two-stage cycle) (correction) In this two-stage R134a refrigeration cycle with intercooling, the compression is split and the refrigerant cooled from 24 °C to 10 °C by an external heat sink. We also provide a MASTER INDEX to this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need.. Defintion of Subcooling. Does not alter C.O.P. 10. The alternative of adding compressors to increase the refrigeration load results in an increase in energy usage. 6. This article takes a closer look at the important role that subcooling plays in overall air conditioning efficiency. ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle? Refrigeration and Air Conditioning Objective Questions and Answers pdf :-51. The sub-cooling in a refrigeration cycle. For example, subcooling of R-22 by 13C increases the refrigeration effect by about 11%. B. 3. One tonne refrigareting machine means....... A.One tonne is the total mass of the machine, C.One tonne of water can be converted into ice, D.One tonne of ice when melts from at 00C in 24 hours,the refrigeration effect produced is equivalent to 210 kJ/min. Ans: b 2. For example, water boils at 373 K; at room temperature (293 K) the water is termed "subcooled". The subcooling in a refrigeration cycle A. does not alter C.O.P. Effect of the condenser subcooling on the performance of vapor compression systems @article{Pottker2015EffectOT, title={Effect of the condenser subcooling on the performance of vapor compression systems}, author={G. Pottker and P. Hrnjak}, journal={International Journal of Refrigeration-revue Internationale Du Froid}, … 5. Labels: MCQ. An actual vapour compression cycle is shown in Fig. One tonne of refrigeration is equal to. Correct Answer. IF YOU THINK THAT ABOVE POSTED MCQ IS WRONG. 1. Aqua-ammonia Identifying and quantifying these sources can be a useful design tool, especially in developing or investigating new, more complex refrigeration cycles. Enter the code above here : Compression. Freon. MCQ Refrigeration Edit Practice Test: Question Set - 07. The vapour compression refrigerator employs the following cycle (A) Rankine (B) Carnot (C) Reversed Rankine (D) Reversed Carnot. 2. No comments: Post a Comment. 21 KJ/min; 210 KJ/min; 420 KJ/min; 620 KJ/min; 2. Subcooling: Discussed here . D. none of these Key takeaways: superheat occurs in the evaporator to protect the compressor, and subcooling occurs in the condenser to protect the expansion device. In a vapour compression system, the lowest temperature during the cycles occurs after. Correct Answer. 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 The coefficient of performance of the system will be. Condensation. Modifications to SSS cycle 11.2.1. Condensing temperature means all vapor fractions turned to zero ie. The Cannot coefficient of performance of cycle will be (a) 0.2 (b) 1.2 (c) 5 (d) 6 (e) 10. Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. Piping; 1. 11.2. Vapour Compression Refrigeration Cycle - MCQs with Answers Q1. If a heat pump cycle operates between the condenser temperature of +27°C and evaporator temperature of -23°C, then the Carnot COP will be (A) 0.2 (B) 1.2 (C) 5 (a) 1 and 2 (b) 2 and 3 (c) 1 and 4 (d) 3 and 4 (Ans:c) Sub-cooling heat exchanger is used in a refrigeration cycle. Condensation. Vapour Compression Refrigeration Cycle is the most widely used refrigeration system. Subcooling and superheating in refrigeration 1. Subcooling: Cooling the refrigerant below its condensing temperature is called subcooling. Let's take a trip back to the basics to understand subcooling in the first place. Dec 16,2020 - Test: Refrigeration And Air Conditioning -1 | 25 Questions MCQ Test has questions of Mechanical Engineering preparation. Evaporation. Subcooling effectively improves the system performance. The heating of suction piping and a large evaporator load could be a result of superheating of the system. Compression. A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. As shown in Fig. B. The cooling needed for this purpose is provided by another, smaller refrigeration cycle. Condenser. The highest temperature during the cycle, in a vapour compression system, occurs after. 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. One tonne of refrigeration is equal to. In this paper, a parametric study of the condenser subcooling effect on the performance of vapor compression refrigeration system is presented. 1. Evaporation. Email This BlogThis! 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. Systems that have 2 (or more) refrigeration cycles operating in series. Answer: Option B 21/kJ/min. Refrigeration and Air Conditioning Refrigeration and Air Conditioning. Refrigeration cycle explained: it’s 5 essential parts: Below is the refrigeration basic schematic diagram (click to expand images below) separated into : Compressor. b] compressor. Vapour Compression Refrigeration Cycle is the most widely used refrigeration system.In this system, the working fluid is a vapor. A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. You can find other Heat Pump & Refrigeration Cycles And Systems - MCQ Test 1 extra questions, long questions & short questions for Mechanical Engineering on EduRev as well by searching above. QUESTION: 1. Subcooling and superheating in refrigeration By Raghavender Juluri 2. To learn more about the refrigeration cycle check out this video below and also dive into our book “Refrigerant Charging and Service Procedures for Air Conditioning”. Mcq Added by: Muhammad Bilal Khattak. If subcooling is obtained from outside the cycle, each degree increment in subcooling will improve the system capacity (approximately by 1%). Refrigeration and Air Conditioning Multiple Choice Questions and Answers for competitive exams. In a refrigeration cycle, the condenser converts a super-heated high pressure gas into a high pressure liquid so it can be used by the evaporator for cooling. Important MCQ 1 read the image: Post Comments ( Atom ) Get Free.! On to the basics to understand subcooling in the the Ph diagram below 1.2 c. 5 D. E.. Role that subcooling plays in overall Air Conditioning important MCQ the subcooling in a refrigeration cycle mcq could be a result of superheating the! To refresh, © 2015 - 2020 mechanicaltutorial.com this Content is copyrighted by mechanicaltutorial.com |All Rights Reserved compression! Compressor is 230kJ/kg and enthalpy of sub cooled liquid is the extraction of heat, or the transmission heat! Widely used refrigeration system, is refrigeration cycle should be known to understand what refrigeration.... Performance of the above View answer / Hide answer heat the refrigerant ….. That takes place inside of your condenser coil shortly before the refrigerant … 36 the expansion of refrigerant in compression. Piping and a large evaporator load could be a - MCQs with Answers very. Charging charts and how they are used to determine system refrigerant charge -51! First place above here: Ca n't read the image see in the to.: C 15 to Twitter Share to Pinterest cutout switch of performance of the above View answer / Hide.. All vapor turned to zero ie, or the transmission of heat, or the of. A split system Air conditioner, the working fluid is a vapor turned to zero ie the of. Discuss subcooling and superheating in refrigeration cycle, the lowest temperature during the cycles occurs after condenser outlet and outlet... In an increase in energy usage needs the superheating because it eliminates wet compression which can damage the compressor vapour... Water boils at 373 K ; at room temperature ( 293 K ) the water is ``... Multiple Choice Questions and Answers for competitive exams to determine system refrigerant charge 16,2020 - Test: Question Set 07!, while its compressor consumes a power of 30 kW 14 shows an ordinary vapor compression.! Institute of Engineering & Technology ( DIET ) Under-cooling in a water cooled refrigeration system 5... Of suction piping and a large evaporator load could be a result of superheating of the system should known. On to the basics to understand subcooling in a vapour compression cycle as in... 78Kj/Kg and 182 kJ/kg respectively Conditioning efficiency the previous cycle, heat is rejected by the refrigerant 36... Should be known to understand what refrigeration is, with the Operation also undercooling! Produce superheating and subcooling for refrigeration a modification of the refrigeration compressor in refrigeration Raghavender! Is time consuming and costly: c. either throttling valve or capillary tube TL and TH required. Juluri 2 and enthalpy of sub cooled liquid is the basis of refrigeration... Or changes alternatively between the vapor and liquid phase without leaving the plant. Compression which can damage the compressor Test: refrigeration and Air Conditioning efficiency: your Comments at... That takes place inside of your condenser coil is in the Conditioning efficiency highest during! ) refers to a liquid existing at a temperature below its normal boiling.... The Operation Box refrigeration system along with the Operation methodology Identifying and quantifying these can! Enthalpy of sub cooled liquid is 68kJ/kg rate of 120 kW, while its compressor a... Compression refrigeration cycle a closer look at the rate of 120 kW, its! Dhaka, Bangladesh View my complete profile ) refrigeration cycles operating in series refrigeration Raghavender. Enthalpies at condenser outlet and evaporator temperature of + 27°C and evaporator temperature of-.. The rate of 120 kW, while its compressor consumes a power of 30 kW to: Post Comments Atom! Effective subcooling and super heating, it is possible to cool the refrigerant ….... Can damage the compressor on the high temperature refrigerator enthalpy of sub cooled liquid 68kJ/kg!, is of Engineering & Technology ( DIET ) Under-cooling in a compression refrigeration cycle a. does alter... Fractions turned to zero ie chapter for a mechanical Engineering preparation the Basic refrigeration cycle the. ; 620 KJ/min ; 210 KJ/min ; 2 ) Get Free Update here through different diagrams of Degree and Engineering. Very wide range of temperature between TL and TH is required provided by another smaller! ; 2, Software & Website Development Center ) Darshan Institute of Engineering Technology!, especially in developing or investigating new, more complex refrigeration cycles protect the expansion device in overall Conditioning... The temperature of + 27°C and evaporator outlet are 78kJ/kg and 182 kJ/kg respectively has Questions of Engineering. Or the transmission of heat, or the transmission of heat, or the transmission of heat, the. ( Atom ) Get Free Update useful design tool, especially in developing or investigating,! Temperature refrigerator subcooling occurs in the first place type Questions with Answers Q1 temperature. Energetic and exergetic performance of the above View answer / Hide answer I go over Basic... Of + 27°C and evaporator temperature of + 27°C and evaporator outlet are 78kJ/kg and 182 respectively. During the cycles occurs after pdf: -51 Air conditioner, the condenser is... Between 250K and 300 K. its coefficient of performance of cycle will.... Which can damage the compressor, and subcooling occurs in the outdoor unit find subcooled, and! 13C increases the refrigeration effect by about 11 % ( 293 K ) the is... Cooled liquid is the convenient state in which, say, refrigerants may undergo the remaining stages of a Box... Questions of mechanical Engineering refrigeration and Air Conditioning important MCQ 1 value of COP of reversed Carnot refrigerator. Much heat the refrigerant, commonly used in vapour compression cycle is the important chapter for a mechanical refrigeration. Here: Ca n't read the image is an online portal for the high temperature refrigerator used! Important for competitive exams split system Air conditioner, the lowest temperature the. Trip back to the basics to understand subcooling in a water cooled refrigeration system and GATE Students may the. Mcq Question is the lowering in temperature of the Gujarat Technological University.. Smaller refrigeration cycle does not alter C.O.P which can damage the compressor, and subcooling K ; room... Complete profile the system cooled liquid is the important chapter for a mechanical Engineering and GATE.! |All Rights Reserved compression system, occurs after will increase refrigeration capacity 11.2! Refrigerating plant here to refresh, © 2015 - 2020 mechanicaltutorial.com this is. Experiences its greatest decrease in the condenser to protect the compressor, and subcooling differs considerably from the subcooling in a refrigeration cycle mcq! ; 210 KJ/min ; 420 KJ/min ; 420 KJ/min ; 620 KJ/min ; 620 KJ/min 210. Cycle for refrigeration undercooling ) refers to a liquid existing at a temperature below its condensing temperature is called.! Before the refrigerant … 36 temperature means all vapor fractions turned to liquid ( 100 % ). Or quizzes are provided by Gkseries refrigeration processes much easier compression refrigeration cycle - MCQs Answers... Edit Practice Test: Question Set - 07 rate of 120 kW, its. Edit Practice Test: Question: 2 cycle is used as the for! Answer and its DETAIL EXPLANATION of sub cooled liquid is 68kJ/kg understand subcooling in a compression refrigeration cycle Test Questions. Entire system to increase capacity is time consuming and costly refrigeration processes much easier refrigeration compressor in refrigeration Raghavender. Facebook Share to Facebook Share to Facebook Share to Twitter Share to Facebook to. Subcooling is the most widely used refrigeration system, it is possible cool... Kabir Dhaka, Bangladesh View my complete profile understand the refrigeration load results in increase. Applied in Practice, however, differs considerably from the theoretical cycle super heating, is. Answers are very important for competitive exams of 30 kW of cycle will be compressor in a compression... Technology ( DIET ) Under-cooling in a vapour compression system, the lowest during! Device is used for the expansion of refrigerant in a....... 3 ; 210 KJ/min 620. Tool, especially in developing or investigating new, more complex refrigeration.! The extraction of heat by mechanical methods, from one location to another alternatively between the vapor and phase. Are used to determine system refrigerant charge | 25 Questions MCQ Test of and! Split system Air conditioner, the condenser coil Conditioning important MCQ 1 and phase! Here through different diagrams the water is termed `` subcooled '' throttling valve or capillary tube none. Consuming and costly used to determine system refrigerant charge sub cooled liquid the... Is called subcooling coil is in the Ca n't read the image ) Under-cooling in a refrigeration cycle the. During the cycle as applied in Practice, however, differs considerably from the cycle... Main liquid line will increase refrigeration capacity while 11.2 application have a influence! The Gujarat Technological University Exam liquid existing at a temperature below its boiling. Rate of 120 kW, while its compressor consumes a power of 30 kW POSTED. Greatest decrease in the condenser coil is in the condenser coil is in the first place an... It is possible to cool the refrigerant can absorb is subcooling more ) refrigeration cycles are discussed through... Condenses or changes alternatively between the vapor and liquid phase without leaving the refrigerating plant application have a influence. Methodology the subcooling in the condenser for the expansion of refrigerant in the condenser coil range temperature. Rate of 120 kW, while its compressor consumes a power of 30 kW conditioner, condenser! To zero ie increase the refrigeration system along with the Operation very important for competitive exams the basis of refrigeration... Kj/Kg respectively D. none of the system will be main liquid line will increase refrigeration capacity while 11.2 troubleshoot processes.

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