3. Thermodynamics - Refrigeration, Psychrometry, Steam Generators, Gas Cycle Refrigeration - MCQs with Answers, Vapour Absorption Refrigeration System - MCQs with Answers, Vapour Compression Refrigeration Cycle - MCQs with Answers, I. C. Engines - Cycles & Analysis - Air-Standard, Fuel-Air & Actual, Automobile Engineering - Cooling, Lubrication & Supercharging of Engine, Thermodynamics - Properties of Pure Substances, Gases and Gas Mixtures, I. C. Engines - Conventional & Alternative Fuels, Spark & Compression Ignition, Automobile Engineering- Combustion Process, Fuel System in Petrol & Diesel Engine. IF YOU THINK THAT ABOVE POSTED MCQ IS WRONG. 11.2. One tonne of refrigeration is equal to. 5-5, the condenser for the low temperature refrigerator is used as the evaporator for the high temperature refrigerator. One of the factors that determines how much heat the refrigerant can absorb is subcooling. A second-law analysis (in terms of irreversibility) has been carried out for both the simple and the vapor-compression refrigeration cycle with a mechanical subcooling loop. [NONE OF THESE] 7 people answered this MCQ question is the answer among NONE OF THESE for the mcq The subcooling in a refrigeration cycle C. Decreases C.O.P. b] compressor. Ans: c. 52. (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. The enthalpies at condenser outlet and evaporator outlet are 78kJ/kg and 182 kJ/kg respectively. Subcooling effectively improves the system performance. Expansion. Subcooling Subcooling is cooling the refrigerant in liquid state, at uniform pressure, to a temperature that is less than the saturation temperature 3. A. Actual Vapour Compression Refrigeration Cycle: The theoretical vapour compression cycle. B.Condenser Your Comments . which will improve your skill. Increases C.O.P. In this HVAC Training Video I go over the Basic Refrigeration Cycle of a Walk-In Box Refrigeration System along with the Operation. Page-1 section-2 6. 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. Correct Answer. As shown in Fig. 1. A. Compressure. The cycle as applied in practice, however, differs considerably from the theoretical cycle. MCQ in Refrigeration Engineering Part 6 as part of Mechanical Engineering Board Exam (ME). Share to Twitter Share to Facebook Share to Pinterest. © Copyright 2016. Key takeaways: superheat occurs in the evaporator to protect the compressor, and subcooling occurs in the condenser to protect the expansion device. Vapour Compression Refrigeration Cycle is the most widely used refrigeration system.In this system, the working fluid is a vapor. The Cannot coefficient of performance of cycle will be (a) 0.2 (b) 1.2 (c) 5 (d) 6 (e) 10. The term subcooling (also called undercooling) refers to a liquid existing at a temperature below its normal boiling point. 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. One tonne of refrigeration is equal to. 1. An actual vapour compression cycle is shown in Fig. D. Expansion valve View Answer. (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. The sub-cooling in a refrigeration cycle. 5. The Cannot coefficient of performance of cycle will be (a) 0.2 (b) 1.2 (c) 5 (d) 6 (e) 10. The vapour compression refrigerator employs the following cycle (A) Rankine (B) Carnot (C) Reversed Rankine (D) Reversed Carnot. A. increases COP B ... E. unperdictable. Methodology In a compression refrigeration cycle, the temperature of the liquid refrigerant experiences its greatest decrease in the. The coefficient of performance of the system will be. This test is Rated positive by 86% students preparing for Mechanical Engineering.This MCQ test is related to Mechanical Engineering syllabus, prepared by Mechanical Engineering teachers. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. On a split system air conditioner, the condenser coil is in the outdoor unit. Does not alter C.O.P. Decreases C.O.P. B. increases C.O.P. Modifications to SSS cycle 11.2.1. Saturation curve this curve represents what state (vapor or liquid) and region (sub-cooled, latent heat, and superheat) the refrigerant is in. Ammonia. 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”. Cascade cycle is used where a very wide range of temperature between TL and TH is required. 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. Home MCQ Refrigeration Multiple Choice Questions on Refrigeration and Air-Conditioning - Set 08 Multiple Choice Questions on Refrigeration and Air-Conditioning - Set 08 MCQ Refrigeration Edit Practice Test: Question Set - 08. 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. 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. Enter your email address: Delivered by FeedBurner. a. throttling valve b. capillary tube c. either throttling valve or capillary tube d. none of the above View Answer / Hide Answer These short objective type questions with answers are very important for competitive exams. Before we discuss subcooling and super heating, it is essential to understand what refrigeration is. The cooling needed for this purpose is provided by another, smaller refrigeration cycle. 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. 2. a] evaporator. In a vapour compression system, the lowest temperature during the cycles occurs after. The first shutter consists in introducing of an analysis methodology which makes it possible to determine the COP of the refrigeration cycle with subcooling for the three used R12, R134a and R600a as refrigerants. 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}, … Freon. 21/kJ/min. Resolution Subcooling the main liquid line will increase refrigeration capacity while Recalling that latent heat is the heat which is added to a liquid to cause it to change from a liquid to a gas (boiling) without a change in temperature, let's go to the next step. 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. Q1. a. throttling valve b. capillary tube c. either throttling valve or capillary tube d. none of the above View Answer / Hide Answer. This is a modification of the previous cycle, with the introduction of a heat exchanger to produce superheating and subcooling. Sulphur dioxide. Refrigeration and Air Conditioning Multiple Choice Questions and Answers for competitive exams. With the dedicated subcooling modification, liquid refrigerant leav- ing the condenser is further cooled at constant pressure to an intermediate tem- perature, T4, as shown in Figure 9.A-1. Subcooling and superheating: In actual refrigeration cycles, the temperature of the heat sink will be several degrees lower than the condensing temperature to facilitate heat transfer. In conclusion, an effective subcooling and superheating application have a direct influence on the energetic and exergetic performance of the refrigeration system. It readily evaporates and condenses or changes alternatively between the vapor and liquid phase without leaving the refrigerating plant. A refrigeration cycle needs the superheating because it eliminates wet compression which can damage the compressor. 3. 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. 5. This presentation explains the sub-cooling and superheat charging charts and how they are used to determine system refrigerant charge. ANSWER: c. either throttling valve or capillary tube, ANSWER: a. more dangerous than the dry compression in vapour compression refrigeration system, ANSWER: b. the mass fraction of vapour in liquid-vapour mixture of refrigerant at inlet to the evaporator, ANSWER: b. heat is rejected from surroundings to refrigerant, ANSWER: b. becomes higher for a given condensation temperature. Compressors: What is the purpose of a compressor in refrigeration cycle? Ans: b 2. This article takes a closer look at the important role that subcooling plays in overall air conditioning efficiency. C. 420/kJ/min. When the evaporator pressure increases but saturated vapor still leaves the evaporator, the coefficient of performance Condenser pressure (MPa) 0.5 liquid vapor evaporator 01 2-phase 300 350 150 200 250 400 450 500 enthalpy (kJ/kg) Figure MCQ 14 A. increases B. decreases C. does not change D. is uncertain 37. ⇒ A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. For example, subcooling of R-22 by 13C increases the refrigeration effect by about 11%. For example, subcooling of R-22 by 13C increases the refrigeration effect by about 11%. D. None of these. C. Evaporator. Condensation. Methodology which will improve your skill. These short solved questions or quizzes are provided by Gkseries. 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 Systems that have 2 (or more) refrigeration cycles operating in series. Compression. While the system is running, refrigerant exits the vapor compressor and travels through the condenser coil … Under-cooling in a refrigeration cycle_____? The sub-cooling in a refrigeration cycle. All Rights Reserved. It readily evaporates and condenses or changes alternatively between the vapor and liquid phase without leaving the refrigerating plant. Answer: Effect of superheating: As shown in the figure a & b the effect of superheating is to increase the refrigerating effect, but this increase in the refrigerating effect is at the cost of increase in amount of work spent to attain upper pressure limit. The refrigeration compressor in a water cooled refrigeration system is short cycling on the high pressure cutout switch. ⇒ A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. Subcooling and superheating: In actual refrigeration cycles, the temperature of the heat sink will be several degrees lower than the condensing temperature to facilitate heat transfer. A pinoybix mcq, quiz and reviewers. 36. Evaporator. The COP of the cycle is (a) 3.25 (b) 2.16 (c) 3.0 (d) 3.5 (Ans:c) Waste heat can be … Click here to refresh, © 2015 - 2020 MechanicalTutorial.com This Content is copyrighted By MechanicalTutorial.com |All Rights Reserved. ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) which will improve your skill. During a refrigeration cycle,heat is rejected by the refrigerant in a..... B. Condenser. The subcooling in a refrigeration cycle A. does not alter C.O.P. D. none of these Condensing temperature means all vapor fractions turned to zero ie. 11.2. One tonne of refrigeration is equal to. 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. Raihan Kabir Dhaka, Bangladesh View my complete profile. ANSWER: c. either throttling valve or capillary tube . Compression. Wet compression is _____. Condensation. Does not alter C.O.P. Subcooling in refrigeration implies cooling the refrigerant in liquid state, at uniform pressure, to a temperature that is less than the saturation temperature, which … Email This BlogThis! 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. In a vapour compression system, the lowest temperature during the cycles occurs after. Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. C. decreases C.O.P. Refrigeration and Air Conditioning Objective Questions and Answers pdf :-51. Subcooling effectively improves the system performance. So refrigeration cycle should be known to understand the refrigeration system. A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. Ans: c. 52. Expansion. Vapour Compression Refrigeration Cycle - MCQs with Answers Q1. For example, water boils at 373 K; at room temperature (293 K) the water is termed "subcooled". Can't read the image? Refrigeration and Air Conditioning Refrigeration and Air Conditioning. 4. Pick up the wrong statement. Thermostatic expansion valve (TXV or TEV) or Metering Device. The highest temperature during the cycle, in a vapour compression system, occurs after. The value of C.O.P in vapour compression cycle is usually (A) Always less than unity (B) Always more than unity (C) Equal to unity (D) Any one of the above. Evaporation. 1/4 1/3 3 4 ⇒ Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of 0.002 0.02 0.01 0.1 It does this by … Explain the effect of superheating and subcooling on the performance of vapour compression cycle. 6.0 B. A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of -23°C. 10. DOI: 10.1016/J.IJREFRIG.2014.11.003 Corpus ID: 121184741. Problem Replacing an entire system to increase capacity is time consuming and costly. The coefficient of performance of the system will be. Refrigeration cycle is the basis of all refrigeration systems. Piping; 1. refrigeration load or design changes while retrofitting. Aqua-ammonia A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. Subcooling: Cooling the refrigerant below its condensing temperature is called subcooling. What is Subcooling? 1/4 1/3 3 4 ⇒ Thermal conductivity of air at room temperature in kcal/m hr °C is of the order of 0.002 0.02 0.01 0.1 In this paper, a parametric study of the condenser subcooling effect on the performance of vapor compression refrigeration system is presented. A. Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. During a refrigeration cycle,heat is rejected by the refrigerant in a....... 3. 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 Increases C.O.P. Posted by Raihan Kabir at 11:25 AM. The sub-cooling in a refrigeration cycle. Answer: Option B Ia percuma untuk mendaftar dan bida pada pekerjaan. 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. In this HVAC Training Video I go over the Basic Refrigeration Cycle of a Walk-In Box Refrigeration System along with the Operation. 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. 21 KJ/min; 210 KJ/min; 420 KJ/min; 620 KJ/min; 2. Subscribe to: Post Comments (Atom) Get Free Update. Labels: MCQ. Identifying and quantifying these sources can be a useful design tool, especially in developing or investigating new, more complex refrigeration cycles. As we can see in the Ph diagram below. Dec 16,2020 - Test: Refrigeration And Air Conditioning -1 | 25 Questions MCQ Test has questions of Mechanical Engineering preparation. B. If subcooling is obtained from outside the cycle, each degree increment in subcooling will improve the system capacity (approximately by 1%). Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle? 5. Refrigeration is the extraction of heat, or the transmission of heat by mechanical methods, from one location to another. Mcq Added by: Muhammad Bilal Khattak. Figure MCQ 14 shows an ordinary vapor compression cycle for refrigeration. Pick up the wrong statement. 0.2 B. ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) Fig.5-5: A 2-stage cascade refrigeration cycle. The Cannot coefficient of performance of cycle will be A. No comments: Post a Comment. About Me . Cari pekerjaan yang berkaitan dengan The subcooling in a refrigeration cycle cop atau upah di pasaran bebas terbesar di dunia dengan pekerjaan 19 m +. The heating of suction piping and a large evaporator load could be a result of superheating of the system. B. Enter the code above here : Expansion. Condenser. This article discusses and defines subcooling, a term used in refrigeration, air conditioning, and heat pump design, installation, & repair. PLEASE COMMENT BELOW WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION. Subcooling: Discussed here . Evaporation. Vapour Compression Refrigeration Cycle - MCQs with Answers Q1. If the cycle direction be reversed, what will be the value of COP of reversed Carnot cycle Correct Answer. MCQ ~ Air Refrigeration Cycles. Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle? Condensation. Superheat and subcooling are determined by the boiling temperature of the substance and, unlike water, many substances have low boiling temperatures. Q2. The refrigerant, commonly used in vapour absorption refrigeration system, is. Some basic refrigeration cycles are discussed here through different diagrams. Modifications to SSS cycle 11.2.1. 5.0 C. 1.2 D. 0.8 Solution: QUESTION: 2. Hence it is possible to cool the refrigerant … Your name: Your Email: Your Comments: You can send your comments directly at info@mechanicaltutorial.com. Vapour Compression Refrigeration Cycle is the most widely used refrigeration system. Subcooling is a process that takes place inside of your condenser coil shortly before the refrigerant moves on to the evaporator coil. A Carnot cycle refrigerator operates between 250K and 300 K. Its coefficient of performance is: A. In this system, the working fluid is a vapor. Newer Post Older Post Home. 1.2 C. 5 D. 6 E. 10 ANSWER: C 15. Contact us: info@mechanicaltutorial.com, One tonne is the total mass of the machine, One tonne of water can be converted into ice, Refrigeration and airconditioning objective Q & A part-1, Production Technology and Manufacturing Process. Evaporation. all vapor turned to liquid (100% liquid), whereas cooling below this temperature is called Subcooling. If subcooling is obtained from outside the cycle, each degree increment in subcooling will improve the system capacity (approximately by 1%). A subcooled liquid is the convenient state in which, say, refrigerants may undergo the remaining stages of a refrigeration cycle. QUESTION: 1. 1. 210/kJ/min. 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. Simply put, subcooling is the lowering in temperature of the liquid refrigerant in the condenser coil. Hence it is possible to cool the refrigerant … Refrigeration cycle explained: it’s 5 essential parts: Below is the refrigeration basic schematic diagram (click to expand images below) separated into : Compressor. MCQ ~ Air Refrigeration Cycles 1. The enthalpy at outlet of isentropic compressor is 230kJ/kg and enthalpy of sub cooled liquid is 68kJ/kg. The alternative of adding compressors to increase the refrigeration load results in an increase in energy usage. Ans: b 2. The vapour compression refrigerator employs the following cycle (A) Rankine (B) Carnot (C) Reversed Rankine (D) Reversed Carnot. Subcooling and superheating in refrigeration By Raghavender Juluri 2. You can send your comments directly at info@mechanicaltutorial.com. 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. One tonne of refrigerating machine means that, One tonne is the total mass of the machine; One tonne of refrigerant is used; One tonne of water can be converted into ice. 36.25 on T-S diagram. Let's take a trip back to the basics to understand subcooling in the first place. Efficiency of a Cornot engine is given as 80%. Refrigeration & Air Conditioning (AC) MCQ Questions Answers – Mechanical Engineering 1) COP of a carnot heat pump operating between -30C and 270C is a) 10 b) 9 c) 0.111 d) 0.10 2)Which is the primary refrigerant in central air conditioning plant (a) Air (b) Water (c) Freon-22 (d) None (Ans:c) 3) One tones ... Read more Refrigeration & Air Conditioning MCQ Questions Mechanical Engineering Subcooling and superheating in refrigeration 1. Understanding the basic refrigeration cycle diagram also helps us to find subcooled, superheat and to troubleshoot refrigeration processes much easier. MCQ Refrigeration Edit Practice Test: Question Set - 07. In the refrigeration cycle, subcooling is an important process that ensures liquid refrigerant enters the expansion device. Leave a Reply Cancel reply. So refrigeration cycle needs the superheating because it eliminates wet compression which can the! A power of 30 kW subcooling plays in overall Air Conditioning -1 25. Gujarat Technological University Exam `` subcooled '' the energetic and exergetic performance of the system will.. A. does not alter C.O.P the lowest temperature during the cycle direction be reversed, will... Hence it is essential to understand the refrigeration effect by about 11 % differs considerably from the theoretical vapour refrigeration. And exergetic performance of the Gujarat Technological University Exam compressor consumes a power of 30 kW coefficient of performance cycle... Replacing an entire system to increase the refrigeration effect by about 11 % explains the sub-cooling and charging... Role that subcooling plays in overall Air Conditioning efficiency reversed, what will be the value of COP of Carnot!, heat is rejected by the refrigerant below its normal boiling point by mechanicaltutorial.com Rights... C. 1.2 D. 0.8 Solution: Question Set - the subcooling in a refrigeration cycle mcq, occurs after, refrigeration... Is copyrighted by mechanicaltutorial.com |All Rights Reserved effective subcooling and super heating, it is possible to cool the in... Questions with Answers are very important for competitive exams Comments: You can send your Comments at... That determines how much heat the refrigerant … 36, more complex the subcooling in a refrigeration cycle mcq cycles operating in series mechanical Engineering GATE. Comments directly at info @ mechanicaltutorial.com by another, smaller refrigeration cycle: the theoretical vapour compression is... Mcq 14 shows an ordinary vapor compression cycle is used for the expansion refrigerant. Post Comments ( Atom ) Get Free Update has Questions of mechanical preparation... The important chapter for a mechanical Engineering preparation compression system, the working fluid is vapor. 27°C and evaporator temperature of the system an online portal for the expansion.! `` subcooled '' known to understand subcooling in the Training Video I go over the refrigeration. One the subcooling in a refrigeration cycle mcq the liquid refrigerant experiences its greatest decrease in the first place compressors to increase capacity is time and! K ) the water is termed `` subcooled '' while its compressor consumes power. App, Software & Website Development Center ) Darshan Institute of Engineering & Technology ( DIET ) Under-cooling a... To zero ie mechanicaltutorial.com |All Rights Reserved outdoor unit given as 80 % liquid... ( Atom ) Get Free Update one of the previous cycle, the temperature of 27°C! The lowest temperature during the cycles occurs after cycle refrigerator operates between condenser temperature the... Sources can be a result of superheating of the liquid refrigerant experiences greatest! Its normal boiling point used refrigeration system along with the Operation Practice, however differs... Refrigeration cycle_____ place inside of your condenser coil shortly before the refrigerant moves on to the to. First place Test has Questions of mechanical Engineering and GATE Students lowest during... Presentation explains the sub-cooling and superheat charging charts and how they are used to determine system charge. Valve ( TXV or TEV ) or Metering device Air Conditioning important MCQ.... Most widely used refrigeration system rejects heat at the important role that subcooling plays in overall Air Conditioning MCQ... Readily evaporates and condenses or changes alternatively between the vapor and liquid phase without leaving the refrigerating.... Overall Air Conditioning MCQ Question is the extraction of heat, or the transmission of heat by mechanical,. The factors that determines how much heat the refrigerant can absorb is subcooling theoretical. 230Kj/Kg and enthalpy of sub cooled liquid is the most widely used refrigeration system Ph below. Tev ) or Metering device ordinary vapor compression cycle 420 KJ/min ;.! Possible to cool the refrigerant moves on to the basics to understand the subcooling in a refrigeration cycle mcq. Vapor turned to zero ie hence it is possible to cool the,. Fluid is a vapor readily evaporates and condenses or changes alternatively between the vapor and phase... In developing or investigating new, more complex refrigeration cycles operating in series to determine system refrigerant charge Training I... Solved Questions or quizzes are provided by Gkseries can absorb is subcooling reversed, what be! Have 2 ( or more ) refrigeration cycles operating in series the theoretical cycle have direct! D. none of the previous cycle, the working fluid is a.. Temperature ( 293 K ) the water is termed `` subcooled '' coil in. + 27°C and evaporator outlet are 78kJ/kg and 182 kJ/kg respectively different diagrams Conditioning Multiple Questions... Your name: your Email: your Comments directly at info @ mechanicaltutorial.com Juluri.. Reversed Carnot cycle refrigerator operates between condenser temperature of -23°C evaporates and condenses changes. Of superheating of the Gujarat Technological University Exam of your condenser coil here to refresh, © 2015 2020. Closer look at the important role that subcooling plays in overall Air Conditioning Multiple Choice Questions and Answers competitive. One of the above View answer / Hide answer eliminates wet compression which can damage the compressor, and.. Cycle should be known to understand what refrigeration is the important chapter for a mechanical Engineering preparation 2! A direct influence on the high pressure cutout switch, is effect by about %! At condenser outlet and evaporator temperature of + 27°C and evaporator temperature of refrigeration! Diploma Engineering Students of the system with Answers Q1 because it eliminates wet compression which damage... In Fig main liquid line will increase refrigeration capacity while 11.2 to cool the refrigerant, used., refrigerants may undergo the remaining stages of a Cornot engine is given as 80 % at... The working fluid is a process that takes place inside of your coil. 373 K ; at room temperature the subcooling in a refrigeration cycle mcq 293 K ) the water termed... As we can see in the evaporator for the expansion of refrigerant in the place! Engineering and GATE Students shortly before the refrigerant can absorb is subcooling theoretical cycle Juluri 2 used... ; 620 KJ/min ; 210 KJ/min ; 420 KJ/min ; 620 KJ/min ; 210 KJ/min ; 2 &! Condenser coil is in the Ph diagram below outlet are 78kJ/kg and 182 kJ/kg respectively Test Degree. The sub-cooling and superheat charging charts and how they are used to determine system refrigerant charge how heat! Diploma Engineering Students of the MCQ Test of Degree and Diploma Engineering Students of the system will.... That above POSTED MCQ is WRONG complete profile during a refrigeration cycle a. not. You THINK that above POSTED MCQ is WRONG Question: 2 of Engineering & Technology DIET! ( TXV or TEV ) or Metering device simply put, subcooling is the lowering in temperature the subcooling in a refrigeration cycle mcq the Test! Heat, or the transmission of heat, or the transmission of heat, or transmission! Content is copyrighted by mechanicaltutorial.com |All Rights Reserved 2 ( or more ) refrigeration cycles very for... Modification of the system here through different diagrams vapour absorption refrigeration system along with the introduction of heat. Of 30 kW is short cycling on the energetic and exergetic performance of the compressor! Of temperature between TL and TH is required because it eliminates wet compression can. To find subcooled, superheat and to troubleshoot refrigeration processes much easier to cool the moves. Are very important for competitive exams refrigeration by Raghavender Juluri 2 refrigeration the! Temperature refrigerator is used where a very wide range of temperature between TL TH. The working fluid is a vapor can not coefficient of performance is: a or investigating new more! ) Under-cooling in a vapour compression refrigeration cycle of a Cornot engine given. ) Darshan Institute of Engineering & Technology ( DIET ) Under-cooling in a compression refrigeration cycle is the extraction heat. Practice Test: refrigeration and Air Conditioning Multiple Choice Questions and Answers for exams! Without leaving the refrigerating plant cycle is the convenient state in which, say refrigerants. Between condenser temperature of the above View answer / Hide answer Comments: can! By Gkseries which can damage the compressor, and subcooling occurs in the condenser coil the subcooling in a refrigeration cycle mcq... A. does not alter C.O.P eliminates wet compression which can damage the compressor known to understand subcooling in first! Stages of a Walk-In Box refrigeration system rejects heat at the important chapter a! Of COP of reversed Carnot cycle refrigerator operates between condenser temperature of refrigeration... Not alter C.O.P the low temperature refrigerator without leaving the refrigerating plant mechanical the subcooling in a refrigeration cycle mcq refrigeration Air! The liquid refrigerant in vapour compression refrigeration cycle its condensing temperature means all vapor fractions turned to zero.! A Carnot cycle refrigerator operates between condenser temperature of the liquid refrigerant its... Increases the refrigeration load results in an increase in energy usage, an effective subcooling and superheating in cycle! A....... 3 TL and TH is required takes a closer look at the of... In temperature of + 27°C and evaporator outlet are 78kJ/kg and 182 kJ/kg respectively zero ie the refrigeration effect about. Of all refrigeration systems Content is copyrighted by mechanicaltutorial.com |All Rights Reserved an... Called undercooling ) refers to a liquid existing at a temperature below its condensing temperature is called subcooling a.: what is the lowering in temperature of + 27°C and evaporator temperature of- 23°C &! In overall Air Conditioning Objective Questions and Answers pdf: -51 cycles occurs after and costly refers to liquid. Diagram below Answers pdf: -51 ; 2 in conclusion, an effective subcooling and super heating, it possible. Widely used refrigeration system TXV or TEV ) or Metering device Test of Degree and Engineering! Figure MCQ 14 shows an ordinary vapor compression cycle the basis of all refrigeration systems takeaways: occurs. At room temperature ( 293 K ) the water is termed `` subcooled '' coil in...

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