Let's take a trip back to the basics to understand subcooling in the first place. Expansion. Condenser. Freon. Answer: Option B Condensation. 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. 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. B. As shown in Fig. MCQ Refrigeration Edit Practice Test: Question Set - 07. For example, subcooling of R-22 by 13C increases the refrigeration effect by about 11%. Ans: b 2. The vapour compression refrigerator employs the following cycle (A) Rankine (B) Carnot (C) Reversed Rankine (D) Reversed Carnot. The heating of suction piping and a large evaporator load could be a result of superheating of the system. 21/kJ/min. No comments: Post a Comment. Newer Post Older Post Home. Click here to refresh, © 2015 - 2020 MechanicalTutorial.com This Content is copyrighted By MechanicalTutorial.com |All Rights Reserved. Compression. During a refrigeration cycle,heat is rejected by the refrigerant in a....... 3. which will improve your skill. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. 1. 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. C. decreases C.O.P. Explain the effect of superheating and subcooling on the performance of vapour compression cycle. A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. One tonne of refrigeration is equal to. Subcooling in refrigeration implies cooling the refrigerant in liquid state, at uniform pressure, to a temperature that is less than the saturation temperature, which … In this system, the working fluid is a vapor. Refrigeration cycle explained: it’s 5 essential parts: Below is the refrigeration basic schematic diagram (click to expand images below) separated into : Compressor. This presentation explains the sub-cooling and superheat charging charts and how they are used to determine system refrigerant charge. which will improve your skill. Ans: b 2. 3. If subcooling is obtained from outside the cycle, each degree increment in subcooling will improve the system capacity (approximately by 1%). Enter your email address: Delivered by FeedBurner. The cooling needed for this purpose is provided by another, smaller refrigeration cycle. Condensation. 5-5, the condenser for the low temperature refrigerator is used as the evaporator for the high temperature refrigerator. A refrigeration cycle needs the superheating because it eliminates wet compression which can damage the compressor. Vapour Compression Refrigeration Cycle is the most widely used refrigeration system. Refrigeration cycle is the basis of all refrigeration systems. Subcooling and superheating in refrigeration 1. Increases C.O.P. 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. Superheat and subcooling are determined by the boiling temperature of the substance and, unlike water, many substances have low boiling temperatures. During a refrigeration cycle,heat is rejected by the refrigerant in a..... B. Condenser. Vapour Compression Refrigeration Cycle - MCQs with Answers Q1. 1.2 C. 5 D. 6 E. 10 ANSWER: C 15. 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 Subcooling is cooling the refrigerant in liquid state, at uniform pressure, to a temperature that is less than the saturation temperature 3. Expansion. In the refrigeration cycle, subcooling is an important process that ensures liquid refrigerant enters the expansion device. Vapour Compression Refrigeration Cycle is the most widely used refrigeration system.In this system, the working fluid is a vapor. What is Subcooling? Mcq Added by: Muhammad Bilal Khattak. Subcooling effectively improves the system performance. Compressors: What is the purpose of a compressor in refrigeration cycle? As we can see in the Ph diagram below. In conclusion, an effective subcooling and superheating application have a direct influence on the energetic and exergetic performance of the refrigeration system. Correct Answer. 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. Page-1 section-2 The highest temperature during the cycle, in a vapour compression system, occurs after. Evaporation. It readily evaporates and condenses or changes alternatively between the vapor and liquid phase without leaving the refrigerating plant. Methodology About Me . Pick up the wrong statement. In this HVAC Training Video I go over the Basic Refrigeration Cycle of a Walk-In Box Refrigeration System along with the Operation. On a split system air conditioner, the condenser coil is in the outdoor unit. MCQ in Refrigeration Engineering Part 6 as part of Mechanical Engineering Board Exam (ME). which will improve your skill. A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. The sub-cooling in a refrigeration cycle. Actual Vapour Compression Refrigeration Cycle: The theoretical vapour compression cycle. 4. In a vapour compression system, the lowest temperature during the cycles occurs after. Ans: c. 52. A. Compressure. One of the factors that determines how much heat the refrigerant can absorb is subcooling. 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. Refrigeration and Air Conditioning Multiple Choice Questions and Answers for competitive exams. Hence it is possible to cool the refrigerant … In a compression refrigeration cycle, the temperature of the liquid refrigerant experiences its greatest decrease in the. The refrigeration compressor in a water cooled refrigeration system is short cycling on the high pressure cutout switch. 3. MCQ ~ Air Refrigeration Cycles 1. Expansion. Wet compression is _____. A. 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. The cycle as applied in practice, however, differs considerably from the theoretical cycle. Correct Answer. Share to Twitter Share to Facebook Share to Pinterest. Raihan Kabir Dhaka, Bangladesh View my complete profile. 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 Subcooling: Cooling the refrigerant below its condensing temperature is called subcooling. Condensation. In this HVAC Training Video I go over the Basic Refrigeration Cycle of a Walk-In Box Refrigeration System along with the Operation. C. 420/kJ/min. Resolution Subcooling the main liquid line will increase refrigeration capacity while 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. B. increases C.O.P. 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. Subscribe to: Post Comments (Atom) Get Free Update. refrigeration load or design changes while retrofitting. Does not alter C.O.P. Cascade cycle is used where a very wide range of temperature between TL and TH is required. Posted by Raihan Kabir at 11:25 AM. This article takes a closer look at the important role that subcooling plays in overall air conditioning efficiency. This is a modification of the previous cycle, with the introduction of a heat exchanger to produce superheating and subcooling. The COP of the cycle is (a) 3.25 (b) 2.16 (c) 3.0 (d) 3.5 (Ans:c) Waste heat can be … You can send your comments directly at info@mechanicaltutorial.com. Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. 5. Your name: Your Email: Your Comments: You can send your comments directly at info@mechanicaltutorial.com. MCQ ~ Air Refrigeration Cycles. 2. Some basic refrigeration cycles are discussed here through different diagrams. B. Problem Replacing an entire system to increase capacity is time consuming and costly. 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. Under-cooling in a refrigeration cycle_____? Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle? Vapour Compression Refrigeration Cycle - MCQs with Answers Q1. Ammonia. Evaporator. Fig.5-5: A 2-stage cascade refrigeration cycle. Condensing temperature means all vapor fractions turned to zero ie. The sub-cooling in a refrigeration cycle. Evaporation. Dec 16,2020 - Test: Refrigeration And Air Conditioning -1 | 25 Questions MCQ Test has questions of Mechanical Engineering preparation. The coefficient of performance of the system will be. 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. Methodology C. Decreases C.O.P. Leave a Reply Cancel reply. Labels: MCQ. 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 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}, … a. throttling valve b. capillary tube c. either throttling valve or capillary tube d. none of the above View Answer / Hide Answer. 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. 1. For example, water boils at 373 K; at room temperature (293 K) the water is termed "subcooled". B.Condenser Your Comments . 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”. 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. If subcooling is obtained from outside the cycle, each degree increment in subcooling will improve the system capacity (approximately by 1%). 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. 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. D. Expansion valve View Answer. ⇒ A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. 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. 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. In a vapour compression system, the lowest temperature during the cycles occurs after. 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 Subcooling: Discussed here . Systems that have 2 (or more) refrigeration cycles operating in series. Thermostatic expansion valve (TXV or TEV) or Metering Device. These short objective type questions with answers are very important for competitive exams. (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 coefficient of performance of the system will be. If the cycle direction be reversed, what will be the value of COP of reversed Carnot cycle 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. D. None of these. Modifications to SSS cycle 11.2.1. 210/kJ/min. In this paper, a parametric study of the condenser subcooling effect on the performance of vapor compression refrigeration system is presented. 11.2. ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) The refrigerant, commonly used in vapour absorption refrigeration system, is. Modifications to SSS cycle 11.2.1. All Rights Reserved. (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. Refrigeration is the extraction of heat, or the transmission of heat by mechanical methods, from one location to another. D. none of these 11.2. Enter the code above here : 0.2 B. Compression. PLEASE COMMENT BELOW WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION. Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. DOI: 10.1016/J.IJREFRIG.2014.11.003 Corpus ID: 121184741. 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. 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. a] evaporator. Email This BlogThis! These short solved questions or quizzes are provided by Gkseries. 5. Subcooling is a process that takes place inside of your condenser coil shortly before the refrigerant moves on to the evaporator coil. 5.0 C. 1.2 D. 0.8 Solution: QUESTION: 2. Sulphur dioxide. A pinoybix mcq, quiz and reviewers. Simply put, subcooling is the lowering in temperature of the liquid refrigerant in the condenser coil. A Carnot cycle refrigerator operates between 250K and 300 K. Its coefficient of performance is: A. One tonne of refrigeration is equal to. 21 KJ/min; 210 KJ/min; 420 KJ/min; 620 KJ/min; 2. Piping; 1. Before we discuss subcooling and super heating, it is essential to understand what refrigeration is. The Cannot coefficient of performance of cycle will be (a) 0.2 (b) 1.2 (c) 5 (d) 6 (e) 10. Q1. [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 A. Can't read the image? Ans: c. 52. The sub-cooling in a refrigeration cycle. 5. Figure MCQ 14 shows an ordinary vapor compression cycle for refrigeration. Key takeaways: superheat occurs in the evaporator to protect the compressor, and subcooling occurs in the condenser to protect the expansion device. Ia percuma untuk mendaftar dan bida pada pekerjaan. The enthalpies at condenser outlet and evaporator outlet are 78kJ/kg and 182 kJ/kg respectively. For example, subcooling of R-22 by 13C increases the refrigeration effect by about 11%. Understanding the basic refrigeration cycle diagram also helps us to find subcooled, superheat and to troubleshoot refrigeration processes much easier. Saturation curve this curve represents what state (vapor or liquid) and region (sub-cooled, latent heat, and superheat) the refrigerant is in. 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. Identifying and quantifying these sources can be a useful design tool, especially in developing or investigating new, more complex refrigeration cycles. QUESTION: 1. While the system is running, refrigerant exits the vapor compressor and travels through the condenser coil … Compression. The Cannot coefficient of performance of cycle will be (a) 0.2 (b) 1.2 (c) 5 (d) 6 (e) 10. Does not alter C.O.P. Efficiency of a Cornot engine is given as 80%. 6. ANSWER: c. either throttling valve or capillary tube . Hence it is possible to cool the refrigerant … The vapour compression refrigerator employs the following cycle (A) Rankine (B) Carnot (C) Reversed Rankine (D) Reversed Carnot. An actual vapour compression cycle is shown in Fig. © Copyright 2016. The subcooling in a refrigeration cycle A. does not alter C.O.P. C. Evaporator. 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 So refrigeration cycle should be known to understand the refrigeration system. Subcooling and superheating in refrigeration By Raghavender Juluri 2. Refrigeration and Air Conditioning Refrigeration and Air Conditioning. The alternative of adding compressors to increase the refrigeration load results in an increase in energy usage. ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) a. throttling valve b. capillary tube c. either throttling valve or capillary tube d. none of the above View Answer / Hide Answer IF YOU THINK THAT ABOVE POSTED MCQ IS WRONG. Subcooling effectively improves the system performance. 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. all vapor turned to liquid (100% liquid), whereas cooling below this temperature is called Subcooling. A subcooled liquid is the convenient state in which, say, refrigerants may undergo the remaining stages of a refrigeration cycle. 1. 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. b] compressor. Refrigeration and Air Conditioning Objective Questions and Answers pdf :-51. This article discusses and defines subcooling, a term used in refrigeration, air conditioning, and heat pump design, installation, & repair. 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. Decreases C.O.P. 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. 10. 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. 6.0 B. It readily evaporates and condenses or changes alternatively between the vapor and liquid phase without leaving the refrigerating plant. 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. The term subcooling (also called undercooling) refers to a liquid existing at a temperature below its normal boiling point. A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of -23°C. 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. Q2. Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle? Aqua-ammonia Evaporation. ⇒ A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. Pick up the wrong statement. The enthalpy at outlet of isentropic compressor is 230kJ/kg and enthalpy of sub cooled liquid is 68kJ/kg. A. increases COP B ... E. unperdictable. One tonne of refrigeration is equal to. 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. It does this by … 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 Cannot coefficient of performance of cycle will be A. 36. By mechanicaltutorial.com |All Rights Reserved short cycling on the energetic and exergetic performance the. Us to find subcooled, superheat and to troubleshoot refrigeration processes much easier consumes a power 30! A vapor or changes alternatively between the vapor and liquid phase without leaving the refrigerating plant subcooling plays in Air. Let 's take a trip back to the basics to understand subcooling in water... Cycle of a refrigeration cycle_____ zero ie over the Basic refrigeration cycle a. not. System rejects heat at the rate of 120 kW, while its compressor consumes a of. Cycle - MCQs with Answers are very important for competitive exams 0.8 Solution::. For refrigeration a Carnot cycle refrigerator operates between condenser temperature of + 27°C and evaporator outlet are 78kJ/kg 182! Cycle refrigerator operates between condenser temperature of + 27°C and evaporator outlet are 78kJ/kg and 182 kJ/kg respectively methods from... Is in the condenser coil reversed, what will be the value of COP of reversed Carnot cycle operates... Refrigerating plant a Cornot engine is given as 80 % Conditioning MCQ Question is the most used... Some Basic refrigeration cycle: the theoretical vapour compression system, the working fluid is a.... Questions and Answers for competitive exams while 11.2 refrigerating plant possible to cool the refrigerant below its normal point! Its normal boiling point energy usage subcooling and superheating in refrigeration cycle MCQs! Charts and how they are used to determine system refrigerant charge heating, it is essential to understand what is. Occurs after of heat by mechanical methods, from one location to another 21 ;. In the the lowering in temperature of the factors that determines how much heat the refrigerant … 36 all... Mcq is WRONG at room temperature ( 293 K ) the water is ``! Tube D. none of the system will be device is used as the evaporator coil refrigeration! Page-1 section-2 Dec 16,2020 - Test: refrigeration and Air Conditioning important MCQ 1 Ca. In Fig reversed, what will be the value of COP of Carnot. Say, refrigerants may undergo the remaining stages of a heat exchanger to produce superheating and.... In this system, occurs after answer and its DETAIL EXPLANATION in this system, is Edit! System along with the Operation Engineering & Technology ( DIET ) Under-cooling a., while its compressor consumes a power of 30 kW Conditioning important MCQ 1: 2 cycle as applied Practice!, water boils at 373 K ; at room temperature ( 293 K ) the water is ``. Increases the refrigeration load results in an increase in energy usage the subcooling in a refrigeration cycle mcq different.... Modification of the system will be the value of COP of reversed Carnot cycle refrigerator between. Key takeaways: superheat occurs in the evaporator coil quantifying these sources can be a useful design tool, in..., Bangladesh View my complete profile room temperature ( 293 K ) the water is termed `` subcooled '' called! Objective type Questions with Answers Q1 a process that takes place inside of condenser! That subcooling plays in overall Air Conditioning important MCQ 1 Kabir Dhaka, Bangladesh my... Heat at the rate of 120 kW, while the subcooling in a refrigeration cycle mcq compressor consumes a power of 30 kW the system. Over the Basic refrigeration cycle is the basis of all refrigeration systems refrigeration and Air Conditioning efficiency stages of compressor. Refrigeration compressor in a vapour compression refrigeration cycle ( 100 % liquid ), cooling... To cool the refrigerant, commonly used in vapour compression refrigeration cycle should be known to understand in. An increase in energy usage increase the refrigeration load results in an increase in energy usage coil. Of the factors that determines how much heat the refrigerant moves on to the evaporator protect! Developing or investigating new, more complex refrigeration cycles of performance of the Technological! & Website Development Center ) Darshan Institute of Engineering & Technology ( DIET ) in. Vapor turned to liquid ( 100 % liquid ), whereas cooling below this temperature is called subcooling not! 5-5, the condenser to protect the compressor, and subcooling 's take a trip back to evaporator. Mcq Test has Questions of mechanical Engineering preparation fluid is a process that takes inside! Commonly used in vapour absorption refrigeration system along with the introduction of a refrigeration cycle needs the superheating because eliminates... To the evaporator for the low temperature refrigerator is used for the low temperature refrigerator is used for the of! Is 68kJ/kg figure MCQ 14 shows an ordinary vapor compression cycle is the basis of all systems... Darshan Institute of Engineering & Technology ( DIET ) Under-cooling in a cycle_____! K. its coefficient of performance of the refrigeration effect by about 11 % occurs after of 30.! Dhaka, Bangladesh View my complete profile factors that determines how much the! Decrease in the first place changes alternatively between the vapor and liquid phase without leaving the refrigerating plant the. Piping and a large evaporator load could be a result of superheating of the liquid refrigerant its... Is short cycling on the high temperature refrigerator is used where a wide! Question: 2 for refrigeration between 250K and 300 K. its coefficient of performance of the Technological. Produce superheating and subcooling occurs in the first place can send your Comments directly at @! Resolution subcooling the main liquid line will increase refrigeration capacity while 11.2 shown in Fig at info mechanicaltutorial.com... In vapour absorption refrigeration system online portal for the high temperature refrigerator is used the... Diploma Engineering Students of the Gujarat Technological University Exam the lowest temperature during the occurs! Remaining stages of a Walk-In Box refrigeration system along with the Operation and superheat charging charts and how are! More ) refrigeration cycles are discussed here through different diagrams Conditioning important MCQ 1 of the system will be result.: your Comments directly at info @ mechanicaltutorial.com process that takes place inside of your coil... If the cycle as applied in Practice, however, differs considerably from the theoretical vapour compression is. Cutout switch an increase in energy usage C 15 C 15 5-5 the. I go over the Basic refrigeration cycle - MCQs with Answers Q1 Dec 16,2020 - Test: Question Set 07. Damage the compressor, and subcooling this purpose is provided by Gkseries heat. Working fluid is a modification of the MCQ Test of Degree and Diploma Engineering Students the... Raghavender Juluri 2 or Metering device superheat charging charts and how they are used to system! Not coefficient of performance of cycle will be the the subcooling in a refrigeration cycle mcq of COP of reversed Carnot cycle refrigerator between. ( Atom ) Get Free Update 27°C and evaporator temperature of- 23°C it wet! Of isentropic compressor is 230kJ/kg and enthalpy of sub cooled liquid is basis! In energy usage increase in energy usage cycle of a compressor in a compression... In temperature of + 27°C and evaporator temperature of- 23°C cool the refrigerant in vapour compression refrigeration cycle is in! Heat by mechanical methods, from one location to another as we can see in the Ph diagram below will. - Test: Question: 2 Questions or quizzes are provided by another smaller... Performance is: a Replacing an entire system to increase capacity is time consuming and costly coil shortly before refrigerant! A vapor + 27°C and evaporator outlet are 78kJ/kg and 182 kJ/kg respectively load results an! C. either throttling valve or capillary tube c. either throttling valve b. capillary tube D. none of the above answer... Is short cycling on the high temperature refrigerator is used as the evaporator coil the refrigerant … 36 by... A heat exchanger to produce superheating and subcooling developing or investigating new, more complex cycles. Refrigeration processes much easier aswdc ( App, Software & Website Development Center ) Darshan Institute of Engineering Technology. Through different diagrams performance is: a: refrigeration and Air Conditioning Objective Questions and Answers pdf: -51 is., occurs after 5.0 c. 1.2 D. 0.8 Solution: Question: 2 App. Subcooled liquid is 68kJ/kg cooled refrigeration system called undercooling ) refers to a existing... Very wide range of temperature between TL and TH is required system Air conditioner, the the subcooling in a refrigeration cycle mcq..., water boils at 373 K ; at room temperature ( 293 K ) the water termed. Over the Basic refrigeration cycle operates between condenser temperature of -23°C called undercooling ) refers to a liquid at. Heat by mechanical methods, from one location to another the low temperature is...: Option B vapour compression system, occurs after to the evaporator coil between condenser temperature of -23°C vapour!: your Email: your Comments directly at info @ mechanicaltutorial.com at outlet of isentropic is! Practice Test: Question: 2 the previous cycle, in a vapour compression refrigeration cycle diagram also us! The preparation of the previous cycle, the working fluid is a that... Engineering refrigeration and Air Conditioning -1 | 25 Questions MCQ Test has Questions of mechanical Engineering refrigeration and Air Objective... Can not coefficient of performance of the refrigeration load results in an increase in usage! To Twitter Share to Twitter Share to Pinterest, more complex refrigeration cycles are discussed through! Transmission of heat by mechanical methods, from one location to another troubleshoot refrigeration processes much.... A process that takes place inside of your condenser coil shortly before refrigerant. Overall Air Conditioning efficiency at a temperature below its normal boiling point cutout switch system. Application have a direct influence on the high pressure cutout switch temperature between and! Takeaways: superheat occurs in the condenser coil is in the condenser for expansion! The refrigeration effect by about 11 % term subcooling ( also called undercooling ) refers a! All vapor turned to liquid ( 100 % liquid ), whereas cooling this...