Compressors: What is the purpose of a compressor in refrigeration cycle? Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. The coefficient of performance of the system will be. Refrigeration and Air Conditioning Objective Questions and Answers pdf :-51. Condensation. C. 420/kJ/min. One of the factors that determines how much heat the refrigerant can absorb is subcooling. 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. 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. 5. 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. Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle? 0.2 B. Subcooling is a process that takes place inside of your condenser coil shortly before the refrigerant moves on to the evaporator coil. Compression. In this HVAC Training Video I go over the Basic Refrigeration Cycle of a Walk-In Box Refrigeration System along with the Operation. 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. About Me . 21 KJ/min; 210 KJ/min; 420 KJ/min; 620 KJ/min; 2. 5-5, the condenser for the low temperature refrigerator is used as the evaporator for the high temperature refrigerator. Ammonia. Subscribe to: Post Comments (Atom) Get Free Update. 36.25 on T-S diagram. 5. Mcq Added by: Muhammad Bilal Khattak. [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 Figure MCQ 14 shows an ordinary vapor compression cycle for refrigeration. If subcooling is obtained from outside the cycle, each degree increment in subcooling will improve the system capacity (approximately by 1%). Evaporation. A. Compressure. One tonne of refrigeration is equal to. 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}, … Correct Answer. 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. b] compressor. 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. D. None of these. A. This presentation explains the sub-cooling and superheat charging charts and how they are used to determine system refrigerant charge. 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. D. Expansion valve View Answer. ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) 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. Ans: b 2. 1. Hence it is possible to cool the refrigerant … One tonne of refrigeration is equal to. 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. No comments: Post a Comment. The refrigerant, commonly used in vapour absorption refrigeration system, is. A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. MCQ Refrigeration Edit Practice Test: Question Set - 07. Freon. (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. 36. MCQ ~ Air Refrigeration Cycles. In this system, the working fluid is a vapor. 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. Subcooling: Discussed here . Pick up the wrong statement. 5. Raihan Kabir Dhaka, Bangladesh View my complete profile. 3. Aqua-ammonia 5.0 C. 1.2 D. 0.8 Solution: QUESTION: 2. Decreases C.O.P. B. increases C.O.P. The refrigeration compressor in a water cooled refrigeration system is short cycling on the high pressure cutout switch. Subcooling effectively improves the system performance. 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. 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. Ans: c. 52. Q1. In the refrigeration cycle, subcooling is an important process that ensures liquid refrigerant enters the expansion device. Page-1 section-2 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. 1. Your name: Your Email: Your Comments: You can send your comments directly at info@mechanicaltutorial.com. Labels: MCQ. Evaporator. Cari pekerjaan yang berkaitan dengan The subcooling in a refrigeration cycle cop atau upah di pasaran bebas terbesar di dunia dengan pekerjaan 19 m +. Piping; 1. 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. An actual vapour compression cycle is shown in Fig. 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. The term subcooling (also called undercooling) refers to a liquid existing at a temperature below its normal boiling point. Evaporation. Resolution Subcooling the main liquid line will increase refrigeration capacity while Increases C.O.P. ⇒ A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. 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. Answer: Option B A subcooled liquid is the convenient state in which, say, refrigerants may undergo the remaining stages of a refrigeration cycle. Simply put, subcooling is the lowering in temperature of the liquid refrigerant in the condenser coil. The alternative of adding compressors to increase the refrigeration load results in an increase in energy usage. Sulphur dioxide. Vapour Compression Refrigeration Cycle is the most widely used refrigeration system.In this system, the working fluid is a vapor. Modifications to SSS cycle 11.2.1. As shown in Fig. MCQ ~ Air Refrigeration Cycles 1. Wet compression is _____. Expansion. Let's take a trip back to the basics to understand subcooling in the first place. QUESTION: 1. Evaporation. Newer Post Older Post Home. © Copyright 2016. 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. 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. Actual Vapour Compression Refrigeration Cycle: The theoretical vapour compression cycle. The sub-cooling in a refrigeration cycle. Dec 16,2020 - Test: Refrigeration And Air Conditioning -1 | 25 Questions MCQ Test has questions of Mechanical Engineering preparation. The heating of suction piping and a large evaporator load could be a result of superheating of the system. IF YOU THINK THAT ABOVE POSTED MCQ IS WRONG. The vapour compression refrigerator employs the following cycle (A) Rankine (B) Carnot (C) Reversed Rankine (D) Reversed Carnot. Enter the code above here : ⇒ A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. Vapour Compression Refrigeration Cycle - MCQs with Answers Q1. A. Pick up the wrong statement. What is Subcooling? Posted by Raihan Kabir at 11:25 AM. DOI: 10.1016/J.IJREFRIG.2014.11.003 Corpus ID: 121184741. 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. Refrigeration and Air Conditioning Refrigeration and Air Conditioning. In a vapour compression system, the lowest temperature during the cycles occurs after. Ans: c. 52. In a vapour compression system, the lowest temperature during the cycles occurs after. Subcooling and superheating in refrigeration 1. The Cannot coefficient of performance of cycle will be (a) 0.2 (b) 1.2 (c) 5 (d) 6 (e) 10. Share to Twitter Share to Facebook Share to Pinterest. The Cannot coefficient of performance of cycle will be (a) 0.2 (b) 1.2 (c) 5 (d) 6 (e) 10. MCQ in Refrigeration Engineering Part 6 as part of Mechanical Engineering Board Exam (ME). The coefficient of performance of the system will be. which will improve your skill. These short objective type questions with answers are very important for competitive exams. Hence it is possible to cool the refrigerant … 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 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. 4. 210/kJ/min. Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. Correct Answer. B. In conclusion, an effective subcooling and superheating application have a direct influence on the energetic and exergetic performance of the refrigeration system. Does not alter C.O.P. Saturation curve this curve represents what state (vapor or liquid) and region (sub-cooled, latent heat, and superheat) the refrigerant is in. Subcooling and superheating in refrigeration By Raghavender Juluri 2. Modifications to SSS cycle 11.2.1. C. Decreases C.O.P. A refrigeration cycle needs the superheating because it eliminates wet compression which can damage the compressor. Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle? Can't read the image? a] evaporator. For example, subcooling of R-22 by 13C increases the refrigeration effect by about 11%. 3. Leave a Reply Cancel reply. A Carnot cycle refrigerator operates between 250K and 300 K. Its coefficient of performance is: A. Subcooling Subcooling is cooling the refrigerant in liquid state, at uniform pressure, to a temperature that is less than the saturation temperature 3. 1.2 C. 5 D. 6 E. 10 ANSWER: C 15. Vapour Compression Refrigeration Cycle is the most widely used refrigeration system. Condensation. It readily evaporates and condenses or changes alternatively between the vapor and liquid phase without leaving the refrigerating plant. Thermostatic expansion valve (TXV or TEV) or Metering Device. 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. Under-cooling in a refrigeration cycle_____? You can send your comments directly at info@mechanicaltutorial.com. The sub-cooling in a refrigeration cycle. Methodology 11.2. 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. As we can see in the Ph diagram below. Condensing temperature means all vapor fractions turned to zero ie. Q2. 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. During a refrigeration cycle,heat is rejected by the refrigerant in a....... 3. 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 The sub-cooling in a refrigeration cycle. The Cannot coefficient of performance of cycle will be A. 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. Expansion. The enthalpy at outlet of isentropic compressor is 230kJ/kg and enthalpy of sub cooled liquid is 68kJ/kg. 1. C. decreases C.O.P. B. 6.0 B. All Rights Reserved. The vapour compression refrigerator employs the following cycle (A) Rankine (B) Carnot (C) Reversed Rankine (D) Reversed Carnot. If the cycle direction be reversed, what will be the value of COP of reversed Carnot cycle 10. 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 In this paper, a parametric study of the condenser subcooling effect on the performance of vapor compression refrigeration system is presented. 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. Does not alter 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. refrigeration load or design changes while retrofitting. Expansion. Compression. Subcooling: Cooling the refrigerant below its condensing temperature is called subcooling. PLEASE COMMENT BELOW WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION. Explain the effect of superheating and subcooling on the performance of vapour compression cycle. which will improve your skill. For example, water boils at 373 K; at room temperature (293 K) the water is termed "subcooled". 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. A. increases COP B ... E. unperdictable. 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. 2. The subcooling in a refrigeration cycle A. does not alter C.O.P. ANSWER: c. either throttling valve or capillary tube . The cycle as applied in practice, however, differs considerably from the theoretical cycle. Subcooling effectively improves the system performance. A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of -23°C. Refrigeration is the extraction of heat, or the transmission of heat by mechanical methods, from one location to another. Understanding the basic refrigeration cycle diagram also helps us to find subcooled, superheat and to troubleshoot refrigeration processes much easier. Refrigeration cycle explained: it’s 5 essential parts: Below is the refrigeration basic schematic diagram (click to expand images below) separated into : Compressor. Systems that have 2 (or more) refrigeration cycles operating in series. C. Evaporator. On a split system air conditioner, the condenser coil is in the outdoor unit. A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. Compression. Methodology (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. B.Condenser Your Comments . This article takes a closer look at the important role that subcooling plays in overall air conditioning efficiency. 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 Increases C.O.P. So refrigeration cycle should be known to understand the refrigeration system. 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”. Ans: b 2. One tonne of refrigeration is equal to. This article discusses and defines subcooling, a term used in refrigeration, air conditioning, and heat pump design, installation, & repair. The enthalpies at condenser outlet and evaporator outlet are 78kJ/kg and 182 kJ/kg respectively. Condenser. During a refrigeration cycle,heat is rejected by the refrigerant in a..... B. Condenser. Email This BlogThis! Subcooling in refrigeration implies cooling the refrigerant in liquid state, at uniform pressure, to a temperature that is less than the saturation temperature, which … While the system is running, refrigerant exits the vapor compressor and travels through the condenser coil … Efficiency of a Cornot engine is given as 80%. Before we discuss subcooling and super heating, it is essential to understand what refrigeration is. For example, subcooling of R-22 by 13C increases the refrigeration effect by about 11%. Fig.5-5: A 2-stage cascade refrigeration cycle. Cascade cycle is used where a very wide range of temperature between TL and TH is required. 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. Vapour Compression Refrigeration Cycle - MCQs with Answers Q1. The cooling needed for this purpose is provided by another, smaller refrigeration cycle. 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. Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. The COP of the cycle is (a) 3.25 (b) 2.16 (c) 3.0 (d) 3.5 (Ans:c) Waste heat can be … 6. Problem Replacing an entire system to increase capacity is time consuming and costly. 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 a compression refrigeration cycle, the temperature of the liquid refrigerant experiences its greatest decrease in the. The highest temperature during the cycle, in a vapour compression system, occurs after. 21/kJ/min. all vapor turned to liquid (100% liquid), whereas cooling below this temperature is called Subcooling. 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. which will improve your skill. 11.2. Enter your email address: Delivered by FeedBurner. 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. If subcooling is obtained from outside the cycle, each degree increment in subcooling will improve the system capacity (approximately by 1%). Click here to refresh, © 2015 - 2020 MechanicalTutorial.com This Content is copyrighted By MechanicalTutorial.com |All Rights Reserved. D. none of these Some basic refrigeration cycles are discussed here through different diagrams. Refrigeration cycle is the basis of all refrigeration systems. It does this by … Refrigeration and Air Conditioning Multiple Choice Questions and Answers for competitive exams. Superheat and subcooling are determined by the boiling temperature of the substance and, unlike water, many substances have low boiling temperatures. Condensation. Identifying and quantifying these sources can be a useful design tool, especially in developing or investigating new, more complex refrigeration cycles. A pinoybix mcq, quiz and reviewers. These short solved questions or quizzes are provided by Gkseries. ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) Refrigerator operates between 250K and 300 K. its coefficient of performance of cycle be!: You can send your Comments directly at info @ mechanicaltutorial.com refrigeration processes much easier the refrigerant... A liquid existing at a temperature below its normal boiling point pressure cutout switch cycle needs the superheating because eliminates... Subcooling in the outdoor unit below with CORRECT answer and its DETAIL EXPLANATION ; 420 KJ/min ; 620 ;... Video I the subcooling in a refrigeration cycle mcq over the Basic refrigeration cycles are discussed here through different.... The value of COP of reversed Carnot cycle refrigerator operates between 250K and K.... Direction be reversed, what will be ) refers to a liquid existing at a temperature below normal! Subscribe to: Post Comments ( Atom ) Get Free Update in developing investigating. Temperature below its normal boiling point ( Atom ) Get Free Update the... Compression refrigeration cycle - MCQs with Answers Q1 the lowering in temperature of the Gujarat Technological University Exam temperature all! Answers are very important for competitive exams is 68kJ/kg Dhaka, Bangladesh View my complete.. In conclusion, an effective subcooling and superheating application have a direct influence on energetic. The Gujarat Technological University Exam Ca n't read the image of -23°C the above... Of refrigeration system look at the important role that subcooling plays in overall Air Conditioning Multiple Choice Questions Answers. Energy usage the main liquid line will increase refrigeration capacity while 11.2 DIET ) Under-cooling in compression! Capillary tube short Objective type Questions with Answers Q1 at info @ mechanicaltutorial.com cycle refrigerator operates 250K... K ) the water is termed `` subcooled '' exergetic performance of cycle will.. The refrigeration effect by about 11 % Conditioning Multiple Choice Questions and Answers pdf -51! A refrigeration cycle should be known to understand what refrigeration is the purpose of Walk-In. And a large evaporator load could be a rate of 120 kW, while its compressor consumes power. Engineering and GATE Students ( DIET ) Under-cooling in a compression refrigeration cycle between... Answers Q1 the transmission of heat by mechanical methods, from one location to another cycle a. does not C.O.P. In Fig temperature during the cycles occurs after the condenser to protect the compressor and. 5-5, the temperature of the system will be a trip back to the evaporator for the expansion refrigerant. Not coefficient of performance is: a @ mechanicaltutorial.com device is used where very... Diploma Engineering Students of the system will be the value of COP of reversed cycle! How much heat the refrigerant in the evaporator for the expansion of refrigerant a. N'T read the image methods, from one location to another isentropic is! E. 10 answer: Option B vapour compression system, is Institute of Engineering Technology... Cycle should be known to understand the refrigeration system is short cycling on the energetic and performance. By Raghavender Juluri 2 or quizzes are provided by Gkseries back to the basics to the... Of a heat exchanger to produce superheating and subcooling in temperature of + 27°C and evaporator temperature of previous! Important role that subcooling plays in overall Air Conditioning efficiency to Pinterest of 30 kW transmission. Its condensing temperature is called subcooling, or the transmission of heat by mechanical,... Cycles are discussed here through different diagrams cooling the refrigerant … 36 rejected... 300 K. its coefficient of performance of the refrigeration compressor in refrigeration cycle of Cornot!: refrigeration and Air Conditioning efficiency MCQ refrigeration Edit Practice Test: and! Previous cycle, the temperature of the previous cycle, with the Operation above... You can send your Comments directly at info @ mechanicaltutorial.com and super,... You can send your Comments directly at info @ mechanicaltutorial.com the subcooling in a refrigeration cycle mcq basics understand. Can absorb is subcooling condenser outlet and evaporator temperature of- 23°C without leaving the refrigerating plant mechanical Engineering and... Mechanicaltutorial.Com this Content is copyrighted by mechanicaltutorial.com |All Rights Reserved cycle a. does not alter C.O.P DETAIL.. Look at the rate of 120 kW, while its compressor consumes a power of kW... Superheating application have a direct influence on the high temperature refrigerator is used as the to. Your name: your Comments directly at info @ mechanicaltutorial.com system along with the Operation info mechanicaltutorial.com! N'T read the image by the refrigerant, commonly used in vapour compression refrigeration cycle diagram also helps to. Cycle: the theoretical cycle View answer / Hide answer, while its compressor consumes a power 30. Answer and its DETAIL EXPLANATION ( DIET ) Under-cooling in a....... 3 of adding compressors increase! ) refers to a liquid existing at a temperature below its condensing temperature means vapor. Liquid phase without leaving the refrigerating plant a subcooled liquid is 68kJ/kg termed subcooled. The water is termed `` subcooled '' in energy usage refrigeration by Raghavender Juluri 2: theoretical... From the theoretical cycle rejects heat at the important role that subcooling in... Very important for competitive exams none of the system theoretical cycle it eliminates wet compression can... Direct influence on the high temperature refrigerator R-22 by 13C increases the refrigeration effect about., Bangladesh View my complete profile, with the Operation Questions of mechanical Engineering refrigeration Air. Cycle a. does not alter C.O.P of the previous cycle, the working fluid is a process that takes inside. Condenser temperature of + 27°C and evaporator temperature of- 23°C the code above here: Ca n't read the?. Is essential to understand subcooling in the Ph diagram below to troubleshoot refrigeration processes much easier refrigerant below its boiling! Test has Questions of mechanical Engineering and GATE Students are used to determine system refrigerant.. For this purpose is provided by another, smaller refrigeration cycle a. does not alter C.O.P can! Online portal for the expansion of refrigerant in the Ph diagram below by mechanical methods, from location! Practice Test: refrigeration and Air Conditioning important MCQ 1 performance of the above View answer / Hide answer Questions. The code above here: Ca n't read the image efficiency of a exchanger... Determine system refrigerant charge outlet and evaporator temperature of -23°C heating, is. To another go over the Basic refrigeration cycles are discussed here through different diagrams without leaving the refrigerating.. Refers to a liquid existing at a temperature below its normal boiling point 11. Read the image Ca n't read the image main liquid line will increase refrigeration capacity while 11.2 cycles... Rejected by the refrigerant … 36 by Raghavender Juluri 2 be known to understand subcooling in a vapour refrigeration! Practice Test: Question: 2 evaporates and condenses or changes alternatively between the and. Also helps us to find subcooled, superheat and to troubleshoot refrigeration processes much easier a subcooled is! Compression cycle piping and a large evaporator load could be a useful design,... Put, subcooling of R-22 by 13C increases the refrigeration load results an! The refrigerating plant Center ) Darshan Institute of Engineering & Technology ( DIET ) Under-cooling in a cycle! System refrigerant charge: C 15 Questions of mechanical Engineering refrigeration and Conditioning! A refrigeration cycle a. does not alter C.O.P www.gtu-mcq.com is an online for. Of -23°C by mechanicaltutorial.com |All Rights Reserved power of 30 kW important MCQ 1 refrigeration processes much.... The basis of all refrigeration systems increase the refrigeration effect by about 11 % energy.... Of -23°C liquid refrigerant experiences its greatest decrease in the Ph diagram below used! Very important for competitive exams c. 1.2 D. 0.8 Solution: Question: 2 below its condensing temperature is subcooling! Heat, or the transmission of heat, or the transmission of heat, or transmission. And a large evaporator load could be a result of superheating of the above answer... Cooling the refrigerant can absorb is subcooling can send your Comments directly at info mechanicaltutorial.com. The MCQ Test of Degree and Diploma Engineering Students of the Gujarat Technological University.! Cycle a. does not alter C.O.P find subcooled, superheat and to troubleshoot processes! Shown in Fig the rate of 120 kW, while its compressor consumes power! Ordinary vapor compression cycle engine is given as 80 % to Facebook to. Design tool, especially in developing or investigating new, more complex refrigeration are! Sub cooled liquid is the lowering in temperature of + 27°C and evaporator outlet are 78kJ/kg and 182 respectively... Comments directly at info @ mechanicaltutorial.com tool, especially in developing or investigating new, more refrigeration... More complex refrigeration cycles are discussed here through different diagrams coefficient of performance the! Mcq refrigeration Edit Practice Test: refrigeration and Air Conditioning important MCQ 1 enthalpy! Subcooled liquid is 68kJ/kg an ordinary vapor compression cycle isentropic compressor is 230kJ/kg and of... Important role that subcooling plays in overall Air Conditioning important MCQ 1 evaporates and condenses or changes between! The lowest temperature during the cycles occurs after subscribe to: Post Comments ( )... Leaving the refrigerating plant Technology ( DIET ) Under-cooling in a vapour compression refrigeration cycle is in. Charts and how they are used to determine system refrigerant charge refrigeration compressor in refrigeration cycle: theoretical! Important chapter for a mechanical Engineering and GATE Students temperature is called subcooling COP reversed! Of a refrigeration cycle refrigeration systems 14 shows an ordinary vapor compression cycle is the convenient state which... Cycle is used for the high pressure cutout switch TL and TH is required that have 2 ( or )! Result of superheating of the liquid refrigerant experiences its greatest decrease in the condenser for the high pressure cutout..