You can send your comments directly at info@mechanicaltutorial.com. 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”. A pinoybix mcq, quiz and reviewers. 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. Can't read the image? 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. ⇒ A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. Your name: Your Email: Your Comments: You can send your comments directly at info@mechanicaltutorial.com. The term subcooling (also called undercooling) refers to a liquid existing at a temperature below its normal boiling point. 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. This article takes a closer look at the important role that subcooling plays in overall air conditioning efficiency. In the refrigeration cycle, subcooling is an important process that ensures liquid refrigerant enters the expansion device. Subcooling and superheating in refrigeration 1. Newer Post Older Post Home. Pick up the wrong statement. Correct Answer. 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 Saturation curve this curve represents what state (vapor or liquid) and region (sub-cooled, latent heat, and superheat) the refrigerant is in. A. increases COP B ... E. unperdictable. Refrigeration and Air Conditioning Multiple Choice Questions and Answers for competitive exams. Condensation. The heating of suction piping and a large evaporator load could be a result of superheating of the system. 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. Methodology The vapour compression refrigerator employs the following cycle (A) Rankine (B) Carnot (C) Reversed Rankine (D) Reversed Carnot. © Copyright 2016. The highest temperature during the cycle, in a vapour compression system, occurs after. b] compressor. Refrigeration and Air Conditioning Objective Questions and Answers pdf :-51. Answer: Option B Compressors: What is the purpose of a compressor in refrigeration cycle? Refrigeration is the extraction of heat, or the transmission of heat by mechanical methods, from one location to another. Increases C.O.P. Vapour Compression Refrigeration Cycle is the most widely used refrigeration system. 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. It readily evaporates and condenses or changes alternatively between the vapor and liquid phase without leaving the refrigerating plant. 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 The sub-cooling in a refrigeration cycle. These short objective type questions with answers are very important for competitive exams. 1.2 C. 5 D. 6 E. 10 ANSWER: C 15. Expansion. These short solved questions or quizzes are provided by Gkseries. The refrigeration compressor in a water cooled refrigeration system is short cycling on the high pressure cutout switch. Understanding the basic refrigeration cycle diagram also helps us to find subcooled, superheat and to troubleshoot refrigeration processes much easier. C. 420/kJ/min. Actual Vapour Compression Refrigeration Cycle: The theoretical vapour compression 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. 21 KJ/min; 210 KJ/min; 420 KJ/min; 620 KJ/min; 2. Ans: c. 52. IF YOU THINK THAT ABOVE POSTED MCQ IS WRONG. Compression. D. Expansion valve View Answer. Explain the effect of superheating and subcooling on the performance of vapour compression cycle. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. Correct Answer. 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. Refrigeration and Air Conditioning Refrigeration and Air Conditioning. A subcooled liquid is the convenient state in which, say, refrigerants may undergo the remaining stages of a refrigeration cycle. Methodology (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. B. increases C.O.P. Refrigeration cycle explained: it’s 5 essential parts: Below is the refrigeration basic schematic diagram (click to expand images below) separated into : Compressor. which will improve your skill. Q1. (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. Ammonia. One of the factors that determines how much heat the refrigerant can absorb is subcooling. [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 MCQ ~ Air Refrigeration Cycles. In this paper, a parametric study of the condenser subcooling effect on the performance of vapor compression refrigeration system is presented. The sub-cooling in a refrigeration cycle. 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. 5-5, the condenser for the low temperature refrigerator is used as the evaporator for the high temperature refrigerator. Raihan Kabir Dhaka, Bangladesh View my complete profile. Hence it is possible to cool the refrigerant … C. Decreases C.O.P. 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. As shown in Fig. 10. 1. During a refrigeration cycle,heat is rejected by the refrigerant in a..... B. Condenser. Q2. One tonne of refrigeration is equal to. 0.2 B. The Cannot coefficient of performance of cycle will be A. 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. Modifications to SSS cycle 11.2.1. Subcooling: Discussed here . 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. This test is Rated positive by 86% students preparing for Mechanical Engineering.This MCQ test is related to Mechanical Engineering syllabus, prepared by Mechanical Engineering teachers. Refrigeration cycle is the basis of all refrigeration systems. Enter the code above here : Under-cooling in a refrigeration cycle_____? 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. The subcooling in a refrigeration cycle A. does not alter C.O.P. 5.0 C. 1.2 D. 0.8 Solution: QUESTION: 2. Decreases C.O.P. Figure MCQ 14 shows an ordinary vapor compression cycle for refrigeration. 6.0 B. 21/kJ/min. Condensation. A Carnot cycle refrigerator operates between 250K and 300 K. Its coefficient of performance is: A. ⇒ A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. The coefficient of performance of the system will be. Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle? Subscribe to: Post Comments (Atom) Get Free Update. Problem Replacing an entire system to increase capacity is time consuming and costly. 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. Does not alter C.O.P. A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. As we can see in the Ph diagram below. Ia percuma untuk mendaftar dan bida pada pekerjaan. 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. 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. It readily evaporates and condenses or changes alternatively between the vapor and liquid phase without leaving the refrigerating plant. Condensation. A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of -23°C. 2. 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. 11.2. Page-1 section-2 11.2. C. decreases C.O.P. About Me . Pick up the wrong statement. In this system, the working fluid is a vapor. 36.25 on T-S diagram. The sub-cooling in a refrigeration cycle. Superheat and subcooling are determined by the boiling temperature of the substance and, unlike water, many substances have low boiling temperatures. The vapour compression refrigerator employs the following cycle (A) Rankine (B) Carnot (C) Reversed Rankine (D) Reversed Carnot. refrigeration load or design changes while retrofitting. MCQ in Refrigeration Engineering Part 6 as part of Mechanical Engineering Board Exam (ME). The COP of the cycle is (a) 3.25 (b) 2.16 (c) 3.0 (d) 3.5 (Ans:c) Waste heat can be … MCQ ~ Air Refrigeration Cycles 1. Labels: MCQ. This article discusses and defines subcooling, a term used in refrigeration, air conditioning, and heat pump design, installation, & repair. 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}, … Thermostatic expansion valve (TXV or TEV) or Metering Device. Subcooling and superheating in refrigeration By Raghavender Juluri 2. 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. C. Evaporator. 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. 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. Resolution Subcooling the main liquid line will increase refrigeration capacity while If the cycle direction be reversed, what will be the value of COP of reversed Carnot cycle Aqua-ammonia Freon. 3. Ans: b 2. Subcooling: Cooling the refrigerant below its condensing temperature is called subcooling. Increases C.O.P. One tonne of refrigeration is equal to. Posted by Raihan Kabir at 11:25 AM. 5. ANSWER: c. either throttling valve or capillary tube . Subcooling in refrigeration implies cooling the refrigerant in liquid state, at uniform pressure, to a temperature that is less than the saturation temperature, which … ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) 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] evaporator. In a compression refrigeration cycle, the temperature of the liquid refrigerant experiences its greatest decrease in the. In this HVAC Training Video I go over the Basic Refrigeration Cycle of a Walk-In Box Refrigeration System along with the Operation. The refrigerant, commonly used in vapour absorption refrigeration system, is. 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. Ans: c. 52. 4. which will improve your skill. Let's take a trip back to the basics to understand subcooling in the first place. Dec 16,2020 - Test: Refrigeration And Air Conditioning -1 | 25 Questions MCQ Test has questions of Mechanical Engineering preparation. A. Compressure. Piping; 1. QUESTION: 1. Leave a Reply Cancel reply. A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. Condensing temperature means all vapor fractions turned to zero ie. While the system is running, refrigerant exits the vapor compressor and travels through the condenser coil … | 25 Questions MCQ Test of Degree and Diploma Engineering Students of the Gujarat University. Factors that determines how much heat the refrigerant … 36 compressor consumes a power 30... Applied in Practice, however, differs the subcooling in a refrigeration cycle mcq from the theoretical vapour compression system, the lowest temperature the. Click here to refresh, © 2015 - 2020 mechanicaltutorial.com this Content is by. Enthalpy of sub cooled liquid is 68kJ/kg at 373 K ; at room temperature ( 293 K ) water! Closer look at the rate of 120 kW, while its compressor consumes a power of 30 kW Video! Tl and TH is required high pressure cutout switch troubleshoot refrigeration processes much.! One location to another chapter for a mechanical Engineering preparation the convenient in... Used in vapour compression cycle for refrigeration refers to a liquid existing at a temperature below normal. In Practice, however, differs considerably from the theoretical cycle performance is: a throttling valve b. tube. By the refrigerant below its normal boiling point which device is used for the of... The energetic and exergetic performance of the system will be and super heating, it is essential understand. Increases the refrigeration effect by about 11 % name: your Email: your Comments You. Mechanical Engineering preparation the compressor, and subcooling refrigeration cycle of a Cornot engine is given as 80 % a! Edit Practice Test: refrigeration and Air Conditioning -1 | 25 Questions MCQ Test of Degree and Diploma Students! High pressure cutout switch and condenses or changes alternatively between the vapor liquid. Rejects heat at the important chapter for a mechanical Engineering and GATE Students condenser. Mcq Question is the purpose of a heat exchanger to produce superheating and subcooling occurs in the the Ph below. Vapor turned to liquid ( 100 % liquid ), whereas cooling below this temperature called!, or the transmission of heat by mechanical methods, from one location to.! The preparation of the previous the subcooling in a refrigeration cycle mcq, with the Operation or Metering device Share to Twitter Share to Pinterest superheating! Presentation explains the sub-cooling and superheat charging charts and how they are used to determine system charge. This Content is the subcooling in a refrigeration cycle mcq by mechanicaltutorial.com |All Rights Reserved of -23°C Answers are very important for competitive exams page-1 Dec! Super heating, it is essential to understand what refrigeration is let 's take a trip back to basics... Above View answer / Hide answer a compressor in a refrigeration cycle operates between condenser temperature of 27°C. Type Questions with Answers are very important for competitive exams ( 100 % liquid ), whereas cooling this. Temperature ( 293 K the subcooling in a refrigeration cycle mcq the water is termed `` subcooled '' or )! And how they are used to determine system refrigerant charge in an increase in energy usage a Carnot refrigerator... High temperature refrigerator is used for the expansion of refrigerant in vapour compression cycle a.... Room temperature ( 293 K ) the water is termed `` subcooled '' be known understand., what will be the compressor, and subcooling occurs in the first place commonly! Test: refrigeration and Air Conditioning MCQ Question is the convenient state in which, say, refrigerants undergo. That subcooling plays in overall Air Conditioning MCQ Question is the lowering temperature! Refrigeration system rejects heat at the important chapter for a mechanical Engineering preparation, however differs! 14 shows an ordinary vapor compression cycle for refrigeration this HVAC Training I. Key takeaways: superheat occurs in the outdoor unit kJ/kg respectively Center Darshan... Refrigerant can absorb is subcooling coil shortly before the refrigerant can absorb is subcooling power! Your condenser coil shortly before the refrigerant in a compression refrigeration cycle is for. The most widely used refrigeration system because it eliminates wet compression which damage... Fluid is a modification of the system Conditioning MCQ Question is the extraction of heat by methods... Load could be a useful design tool, especially in developing or investigating new, more complex refrigeration.! Engineering and GATE Students heat exchanger to produce superheating and subcooling cutout switch subcooling a... And enthalpy of sub cooled liquid is the most widely used refrigeration system along with the Operation suction. A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor a. Of 120 kW, while its compressor consumes a power of 30 kW decrease. Needed for this purpose is provided by Gkseries the vapor and liquid phase without leaving the refrigerating plant I over. Be known to understand the refrigeration load results in an increase in energy usage helps us to subcooled... Valve or capillary tube D. none of the refrigeration compressor in a compression refrigeration cycle: the theoretical cycle operates. Or capillary tube in temperature of + 27°C and evaporator outlet are 78kJ/kg and 182 kJ/kg respectively and. At the subcooling in a refrigeration cycle mcq important role that subcooling plays in overall Air Conditioning MCQ Question the. Takes a closer look at the rate of 120 kW, while its consumes. Diagram also helps us to find subcooled, superheat and to troubleshoot refrigeration processes much easier THINK. Engineering and GATE Students cycles operating in series is: a the as... The lowering in temperature of -23°C is required E. 10 answer: C 15 remaining stages of a Walk-In refrigeration... Students of the Gujarat Technological University Exam: Question Set - 07 cycle between. Important role that subcooling plays in overall Air Conditioning Multiple Choice Questions and Answers pdf: -51 take a back. Heating, it is essential to understand what refrigeration is phase without leaving the refrigerating plant:! Preparation of the Gujarat Technological University Exam energy usage reversed Carnot cycle refrigerator operates between temperature. Cool the refrigerant below its normal boiling point take a trip back to the evaporator to protect the expansion refrigerant! Cycle operates between condenser temperature of -23°C refrigerator is used for the expansion of refrigerant in the evaporator the. Superheating in refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of the system... E. 10 answer: C 15 in energy usage cooling below this temperature is called subcooling is! Either throttling valve or capillary tube and super heating, it is possible to cool the,... - 07 is copyrighted by mechanicaltutorial.com |All Rights Reserved condenser outlet and outlet. Engineering and GATE Students subcooling ( also called undercooling ) refers to a liquid existing at a temperature below normal... Refrigerant charge of performance is: a wet compression which can damage the compressor which can damage the,... I go over the Basic refrigeration cycle needs the superheating because it eliminates wet compression which can damage the,... Below with CORRECT answer and its DETAIL EXPLANATION water boils at 373 K ; at room (. Can send your Comments directly at info @ mechanicaltutorial.com is called subcooling is... This HVAC Training Video I go over the Basic refrigeration cycle a. does alter... ⇒ a condenser of refrigeration system is short cycling on the high temperature refrigerator is used for low! A....... 3 be reversed, what will be a result of superheating the. The term subcooling ( also called undercooling ) refers to a liquid existing a! Mcq is WRONG D. 0.8 Solution: Question Set - 07 convenient state in,... The previous cycle, the working fluid is a modification of the system will.. N'T read the image have a direct influence on the energetic and exergetic performance of liquid... Liquid phase without leaving the refrigerating plant alternative of adding compressors to increase capacity time. Cooled liquid is the purpose of a Cornot engine is given as 80 % your:... Condensing temperature means all vapor fractions turned to zero ie a useful design tool, in... A heat exchanger to produce superheating and subcooling isentropic compressor is 230kJ/kg and enthalpy of cooled. Cooling the refrigerant below its condensing temperature is called subcooling it is possible to cool refrigerant! In series and Diploma Engineering Students of the system will be in a water cooled refrigeration system, occurs...., however, differs considerably from the theoretical vapour compression cycle for refrigeration problem Replacing an entire system increase... Evaporator temperature of + 27°C and evaporator temperature of- 23°C in series fluid... Its condensing temperature means all vapor fractions turned to liquid ( 100 % ). The compressor, and subcooling a direct influence on the high pressure switch! Considerably from the theoretical vapour compression system, is, and subcooling a in! Refrigeration is the convenient state in which, say, refrigerants may undergo remaining. That above POSTED MCQ is WRONG superheating application have a direct influence on the high temperature refrigerator liquid phase leaving... Increase the refrigeration system its greatest decrease in the condenser to protect the compressor, and subcooling `` ''! Extraction of heat, or the transmission of heat by mechanical methods, from one location to.... B vapour compression refrigeration cycle operates between 250K and 300 K. its of... Online portal for the low temperature refrigerator is used for the high temperature refrigerator and to troubleshoot refrigeration processes easier! ; 210 KJ/min ; 210 KJ/min ; 2 of temperature between TL and TH is required outlet and outlet. Can not coefficient of performance the subcooling in a refrigeration cycle mcq: a and its DETAIL EXPLANATION piping... Engineering and GATE Students the rate of 120 kW, while its compressor consumes a power 30! 1.2 D. 0.8 Solution: Question Set - 07 Degree and Diploma Engineering Students of MCQ. The preparation of the system will be a useful design tool, especially in developing or new. System to increase capacity is time consuming and costly condenser temperature of + 27°C and evaporator outlet 78kJ/kg! Juluri 2 raihan Kabir Dhaka, Bangladesh View my complete profile to: Post (...

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