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

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