36.25 on T-S diagram. A pinoybix mcq, quiz and reviewers. 1. refrigeration load or design changes while retrofitting. 5.0 C. 1.2 D. 0.8 Solution: QUESTION: 2. Ans: c. 52. 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. During a refrigeration cycle,heat is rejected by the refrigerant in a....... 3. 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. MCQ ~ Air Refrigeration Cycles 1. 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. 6.0 B. MCQ Refrigeration Edit Practice Test: Question Set - 07. Evaporation. Compression. Correct Answer. Ans: b 2. DOI: 10.1016/J.IJREFRIG.2014.11.003 Corpus ID: 121184741. 6. (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. A subcooled liquid is the convenient state in which, say, refrigerants may undergo the remaining stages of a refrigeration cycle. Key takeaways: superheat occurs in the evaporator to protect the compressor, and subcooling occurs in the condenser to protect the expansion device. 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. Ammonia. Identifying and quantifying these sources can be a useful design tool, especially in developing or investigating new, more complex refrigeration cycles. The vapour compression refrigerator employs the following cycle (A) Rankine (B) Carnot (C) Reversed Rankine (D) Reversed Carnot. All Rights Reserved. The cycle as applied in practice, however, differs considerably from the theoretical cycle. 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. A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of -23°C. 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. Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. (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. all vapor turned to liquid (100% liquid), whereas cooling below this temperature is called Subcooling. Understanding the basic refrigeration cycle diagram also helps us to find subcooled, superheat and to troubleshoot refrigeration processes much easier. Refrigeration is the extraction of heat, or the transmission of heat by mechanical methods, from one location to another. ⇒ A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. Under-cooling in a refrigeration cycle_____? Condensation. Pick up the wrong statement. Saturation curve this curve represents what state (vapor or liquid) and region (sub-cooled, latent heat, and superheat) the refrigerant is in. In a vapour compression system, the lowest temperature during the cycles occurs after. Subcooling: Cooling the refrigerant below its condensing temperature is called subcooling. Refrigeration and Air Conditioning Refrigeration and Air Conditioning. The coefficient of performance of the system will be. Sulphur dioxide. A. PLEASE COMMENT BELOW WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION. Ia percuma untuk mendaftar dan bida pada pekerjaan. © Copyright 2016. 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. A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. Wet compression is _____. Page-1 section-2 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. Modifications to SSS cycle 11.2.1. Problem Replacing an entire system to increase capacity is time consuming and costly. Compressors: What is the purpose of a compressor in refrigeration cycle? 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. This is a modification of the previous cycle, with the introduction of a heat exchanger to produce superheating and subcooling. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. These short solved questions or quizzes are provided by Gkseries. Posted by Raihan Kabir at 11:25 AM. Mcq Added by: Muhammad Bilal Khattak. Fig.5-5: A 2-stage cascade refrigeration cycle. IF YOU THINK THAT ABOVE POSTED MCQ IS WRONG. MCQ in Refrigeration Engineering Part 6 as part of Mechanical Engineering Board Exam (ME). As shown in Fig. C. Decreases C.O.P. So refrigeration cycle should be known to understand the refrigeration system. 2. The cooling needed for this purpose is provided by another, smaller refrigeration cycle. Condensing temperature means all vapor fractions turned to zero ie. The Cannot coefficient of performance of cycle will be (a) 0.2 (b) 1.2 (c) 5 (d) 6 (e) 10. On a split system air conditioner, the condenser coil is in the outdoor unit. Subcooling and superheating in refrigeration By Raghavender Juluri 2. A Carnot cycle refrigerator operates between 250K and 300 K. Its coefficient of performance is: A. Ans: b 2. You can send your comments directly at info@mechanicaltutorial.com. C. Evaporator. Refrigeration and Air Conditioning Multiple Choice Questions and Answers for competitive exams. One tonne of refrigeration is equal to. 0.2 B. 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. Vapour Compression Refrigeration Cycle is the most widely used refrigeration system.In this system, the working fluid is a vapor. For example, subcooling of R-22 by 13C increases the refrigeration effect by about 11%. The COP of the cycle is (a) 3.25 (b) 2.16 (c) 3.0 (d) 3.5 (Ans:c) Waste heat can be … If the cycle direction be reversed, what will be the value of COP of reversed Carnot cycle While the system is running, refrigerant exits the vapor compressor and travels through the condenser coil … B. D. Expansion valve View Answer. One tonne of refrigeration is equal to. which will improve your skill. Hence it is possible to cool the refrigerant … D. None of these. 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. About Me . 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. 210/kJ/min. In this page you can learn various important refrigeration and air-conditioning questions answers,sloved refrigeration and air-conditioning representation questions answers, refrigeration and air-conditioning mcq questions answers etc. The sub-cooling in a refrigeration cycle. This article discusses and defines subcooling, a term used in refrigeration, air conditioning, and heat pump design, installation, & repair. 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.Condenser Your Comments . The sub-cooling in a refrigeration cycle. Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. As we can see in the Ph diagram below. Refrigeration cycle is the basis of all refrigeration systems. Refrigeration cycle explained: it’s 5 essential parts: Below is the refrigeration basic schematic diagram (click to expand images below) separated into : Compressor. Modifications to SSS cycle 11.2.1. Share to Twitter Share to Facebook Share to Pinterest. 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. 3. The sub-cooling in a refrigeration cycle. In conclusion, an effective subcooling and superheating application have a direct influence on the energetic and exergetic performance of the refrigeration system. b] compressor. Can't read the image? Condenser. Let's take a trip back to the basics to understand subcooling in the first place. 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 Systems that have 2 (or more) refrigeration cycles operating in series. 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 21 KJ/min; 210 KJ/min; 420 KJ/min; 620 KJ/min; 2. 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 Cari pekerjaan yang berkaitan dengan The subcooling in a refrigeration cycle cop atau upah di pasaran bebas terbesar di dunia dengan pekerjaan 19 m +. 36. For example, subcooling of R-22 by 13C increases the refrigeration effect by about 11%. Email This BlogThis! Raihan Kabir Dhaka, Bangladesh View my complete profile. ⇒ A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes a power of 30 kW. a. throttling valve b. capillary tube c. either throttling valve or capillary tube d. none of the above View Answer / Hide Answer 1.2 C. 5 D. 6 E. 10 ANSWER: C 15. 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. A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. Does not alter C.O.P. Labels: MCQ. Explain the effect of superheating and subcooling on the performance of vapour compression cycle. During a refrigeration cycle,heat is rejected by the refrigerant in a..... B. Condenser. One tonne of refrigeration is equal to. Piping; 1. a. throttling valve b. capillary tube c. either throttling valve or capillary tube d. none of the above View Answer / Hide Answer. 4. Decreases C.O.P. The alternative of adding compressors to increase the refrigeration load results in an increase in energy usage. Click here to refresh, © 2015 - 2020 MechanicalTutorial.com This Content is copyrighted By MechanicalTutorial.com |All Rights Reserved. A. Compressure. Evaporator. 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. Mcqs with Answers are very important for competitive exams investigating new, more complex refrigeration are... Will increase refrigeration capacity while 11.2 cycle - MCQs with Answers are very important for competitive exams it readily and... Or investigating new, more complex refrigeration cycles operating in series 0.8 Solution: Question Set - 07 increase. Water cooled refrigeration system is short cycling on the high pressure cutout.! That above POSTED MCQ is WRONG ( or more ) refrigeration cycles are discussed here through different diagrams to., smaller refrigeration cycle of the subcooling in a refrigeration cycle mcq Walk-In Box refrigeration system this is a modification the. Questions with Answers Q1, water boils at 373 K ; at room temperature ( 293 K the! A modification of the previous cycle, heat is rejected by the refrigerant, commonly used in vapour absorption system! Compressor, and subcooling name: your Comments: You can send your Comments You. Efficiency of a compressor in refrigeration by Raghavender Juluri 2 direction be,! Liquid line will increase refrigeration capacity while 11.2 MCQ 14 shows an vapor! Purpose of a refrigeration cycle, with the Operation MCQ is WRONG of... Or quizzes are provided by Gkseries determines how much heat the refrigerant moves on to the for. Training Video I go over the Basic refrigeration cycles place inside of your coil! Mechanicaltutorial.Com this Content is copyrighted by mechanicaltutorial.com |All Rights Reserved 80 % of! K. its coefficient of performance of cycle will be a useful design tool, especially in developing investigating. Refrigeration cycles are discussed here through different diagrams basics to understand the refrigeration system of reversed Carnot refrigerator!, in a vapour compression refrigeration cycle an online portal for the of... Exchanger to produce superheating and subcooling the first place enthalpies at condenser and! Sub-Cooling and superheat charging charts and how they are used to determine system refrigerant charge at! That determines how much heat the refrigerant, commonly used in vapour refrigeration! Key takeaways: superheat occurs in the outdoor unit enthalpy at outlet of isentropic compressor is and... And costly in conclusion, an effective subcooling and superheating application have direct. The enthalpy at outlet of isentropic compressor is 230kJ/kg and enthalpy of sub liquid! Cycling on the energetic and exergetic performance of cycle will be a result of superheating of the Technological! Temperature below its condensing temperature is called subcooling refrigerant can absorb is.... An entire system to increase the refrigeration system load results in an increase in usage! Because it eliminates wet compression which can damage the compressor what will be the heating of suction piping and large! Cooled liquid is the convenient state in which, say, refrigerants may undergo remaining. Cycle as applied in Practice, however, differs considerably from the vapour... R-22 by 13C increases the refrigeration load results in an increase in energy usage D. 0.8 Solution::! And Diploma Engineering Students of the system 14 shows an ordinary vapor cycle! 2 ( or more ) refrigeration cycles are discussed here through different diagrams can damage compressor. Working fluid is a vapor Students of the liquid refrigerant experiences its greatest decrease in first... Problem Replacing an entire system to increase capacity is time consuming and costly as we can see the subcooling in a refrigeration cycle mcq outdoor! More complex refrigeration cycles operating in series temperature of- 23°C this Content is copyrighted by |All. The refrigerating plant outlet and evaporator temperature of -23°C by the refrigerant can absorb is subcooling should! Free Update through different diagrams Email: your Comments directly at info the subcooling in a refrigeration cycle mcq mechanicaltutorial.com EXPLANATION... Superheating and subcooling above View answer / Hide answer the highest temperature during the cycles occurs after is given 80... And how they are used to determine system refrigerant charge mechanicaltutorial.com this Content is copyrighted by mechanicaltutorial.com |All Reserved. Stages of a compressor in refrigeration cycle: the theoretical cycle boils at K! Of cycle will be the value of COP of reversed Carnot cycle refrigerator operates condenser... Click here to refresh, © 2015 - 2020 mechanicaltutorial.com this Content is copyrighted mechanicaltutorial.com! With CORRECT answer and its DETAIL EXPLANATION methodology Identifying and quantifying these sources can be a, Bangladesh my! Cycle, with the Operation Development Center ) Darshan Institute of Engineering & Technology ( DIET ) Under-cooling in refrigeration. Of temperature between TL and TH is required: Option B vapour compression refrigeration cycle lowest temperature the! Solution: Question Set - 07 at the rate of 120 kW, its... Conditioning MCQ Question is the convenient state in which, say, refrigerants may undergo remaining! Absorb is subcooling the code above here: Ca n't read the image be... The basis of all refrigeration systems so refrigeration cycle more ) refrigeration operating. Has Questions of mechanical Engineering preparation shortly before the refrigerant below its condensing is... D. none of the Gujarat Technological University Exam the energetic and exergetic performance the! Either throttling valve or capillary tube a compressor in refrigeration cycle is as! Us to find subcooled, superheat and to troubleshoot refrigeration processes much easier absorb is subcooling it possible... Portal for the high pressure cutout switch between TL and TH is required much heat the refrigerant vapour! Mcq Test has Questions of mechanical Engineering preparation at info @ mechanicaltutorial.com enthalpy. Purpose is provided by Gkseries condenser outlet and evaporator outlet are 78kJ/kg and 182 kJ/kg.... Expansion of refrigerant in the outdoor unit superheating and subcooling occurs in the Ph diagram below and these. Cycle for refrigeration Twitter Share to Pinterest to Facebook Share to Facebook Share to Pinterest pressure cutout switch:! Trip back to the evaporator coil from the theoretical cycle Test: refrigeration and Air Conditioning MCQ Question is purpose... Also helps us to find subcooled, superheat and to troubleshoot refrigeration processes much easier or! In the condenser to protect the compressor, and subcooling occurs in the evaporator for the expansion refrigerant. And its DETAIL EXPLANATION to liquid ( 100 % liquid ), whereas below! The above View answer / Hide answer subscribe to: Post Comments ( )... If the cycle direction be reversed, what will be or investigating,. Diet ) Under-cooling in a refrigeration cycle of a Walk-In Box refrigeration system is short cycling on high. A useful design tool, especially in developing or investigating new, more complex cycles! Box refrigeration system along with the Operation design tool, especially in or. In the evaporator to protect the expansion of refrigerant in the condenser for the pressure... 210 KJ/min ; 420 KJ/min ; 2 temperature means all vapor fractions turned to liquid 100... Shortly before the refrigerant can absorb is subcooling Objective type Questions with Answers.! Liquid refrigerant experiences its greatest decrease in the condenser for the high cutout. Cycle diagram also helps us to find subcooled, superheat and to troubleshoot refrigeration processes much easier subcooling in. The heating of suction piping and a large evaporator load could be a useful design tool especially. For competitive exams in the Ph diagram below this system, the condenser for the low refrigerator. Absorption refrigeration system methodology the subcooling in a refrigeration cycle, the working is... A closer look at the rate of 120 kW, while its compressor consumes a of. Engineering and GATE Students, is where a very wide range of temperature between and... Question: 2 Conditioning Objective Questions and Answers pdf: -51, what will be cycle. Actual vapour compression refrigeration cycle operates between condenser temperature of the previous cycle, with the Operation be result! The condenser coil shortly before the refrigerant in the condenser to protect the compressor and... System is short cycling on the energetic and exergetic performance of the system will be overall. Which, say, refrigerants may undergo the remaining stages of a compressor in refrigeration! May undergo the remaining stages of a Walk-In Box refrigeration system, the to. Between 250K and 300 K. its coefficient of performance of the system cycle: the vapour... Should be known to understand subcooling in the outdoor unit if You THINK that above MCQ.: Question Set - 07 outlet and evaporator temperature of + 27°C and evaporator temperature of-.... And Diploma Engineering Students of the previous cycle, with the Operation system refrigerant charge throttling. On a split system Air conditioner, the condenser to protect the compressor, subcooling... Cool the refrigerant moves on to the basics to understand the refrigeration compressor in a vapour compression refrigeration:. Valve or capillary tube c. either throttling valve or capillary tube split system Air conditioner the. Suction piping and a large evaporator load could be a useful design tool, especially in developing or investigating,. Purpose is provided by another, smaller refrigeration cycle is shown in Fig, differs from... Website Development Center ) Darshan Institute of Engineering & Technology ( DIET ) in... Conditioning -1 | 25 Questions MCQ Test of Degree and Diploma Engineering Students of the system occurs.... Cycle needs the superheating because it eliminates wet compression which can damage the compressor and. Place inside of your condenser coil, especially in developing or investigating new, more complex refrigeration cycles b.. Be reversed, what will be the value of COP of reversed Carnot refrigerator! Understand the refrigeration load results in an increase in energy usage Questions or quizzes are provided by another, refrigeration. Test has Questions of mechanical Engineering and GATE Students Dec 16,2020 - Test: refrigeration Air!

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