It condenses the refrigerant vapor to … Option – c) 12)Clapeyron equation is a relation between (a) temperature, pressure and enthalpy 0.2 B. A. compressor ... PakMcqs.com is the Pakistani Top Mcqs website, where you can find Mcqs of all Subjects, You can also Submit Mcqs of your recent test and Take online Mcqs Quiz test. If the temperature of intake air in internal combustion engine increases, then its efficiency will... Chain Drives MCQ Practice Test: 1. If cooling capacity of the plant is 2.4 kW then what is the work requirement? 1. vapour, During improves the C.O.P., as the condenser is small, The ... 16 Ammonia-absorption refrigeration cycle requires A very little work input. Practice Test: Question Set - 10 1. Which of the following statement is true for a condenser? Pick up the wrong statement. Evaporation. MCQ No - 1. COP of Carnot refrigerator    will decrease if upper temperature  T1 is  During this process it If a heat pump is operated between same temperature range, then what would be its COP? 1.2 C. 5 D. 6 E. 10 ANSWER: C 15. A.Evaporator B.Condenser C.Expansion valve D.Compressor E.All of the above Related posts: A Rankine cycle working with saturated steam differs thermodynamically from a Carnot cycle only in the fact that If a discharge pressure of a refrigeration compressor is too high, it shows there is (are) A thermometer in the compressor discharge line The flow of […] which will improve your skill. ... A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. a) refrigerant b) absorbent c) both of the mentioned d) none of the mentioned View Answer. Vapor absorption refrigeration is also a vapor compression system. Practice Test: Question Set - 01 1. Vapour Compression Refrigeration Cycle - MCQs with Answers Q1. Military com electrical engineering and all June 25th, 2018 - and all ... quiz refrigeration multiple choice questions and answers pdf mcqs who is known as father 35 / 41. of refrigeration for online exam test prep' Pick up the wrong statement. It condenses the refrigerant vapor to … Reason (R): Vapour compression refrigeration cycles have high COP compared to air refrigeration cycles. Choose the letter of the best answer in each questions. A refrigerator based on reversed Carnot cycle works between two such temperatures that the ratio between the low and high temperature is 0.8. Solution(By Examveda Team) The processes are used for scientific, industrial and commercial purposes. Page-7 section-4 (5) Answer: Option C (14) Answer: Option C Practice Test: Question Set - 02 1. Practice Test: Question Set - 05 1. 1. 9 kJ/s and the outside temperature in winter is 5°C. Evaporation. A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of -23°C. Expansion. The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is (a) same (b) more (c) less (d) more or less depending on ambient conditions (e) unpredictable. In vapour compression cycle, the condition of refrigerant is very wet vapour . Both A and R are individually true but R is not the correct explanation of A, Both A and R are individually true and R is the correct explanation of A. Evaporator Temperature = 273 – 30 = 243 K, A Carnot heat pump works between temperature limits of 277º C and 27º C. Its COP is. A heat pump operating on Carnot cycle pumps heat from a reservoir at 300 K to a reservoir at 600 K. The coefficient of performance is: Assertion (A): Heat pump used for heating is a definite advancement over the simple electric heater. Converts gas into liquid. 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 Reduces temperature of refrigerant. answer choices . It causes refrigeration from heat. (4) Answer: Option B Efficiency of a Cornot engine is given as 80%. a. throttling valve b. capillary tube c. either throttling valve or capillary tube d. none of the above View Answer / Hide Answer Practice Test: Question Set - 16 1. The Vapor Compression Refrigeration Cycle involves four components: compressor, condenser, expansion valve/throttle valve and evaporator. long questions & short questions for Mechanical Engineering on EduRev as well by searching above. The C.O.P. answer choices . Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle? Compression. The minimum outside temperature is –23°C. To improve the COP of a refrigeration system, the sub-cooling in the condenser should be (a) High (b) Low (c) Zero (d) None (Ans:a) The cooling effect is higher in a (a) Boot strap air refrigeration cycle (b) Bell column cycle (c) Vapor compression cycle (d) None (Ans: c) The boiling point of a liquid increases with the (a) Decrease of pressure horizontal and non-uniformly spaced lines on a psychrometric chart indicates, It students definitely take this Heat Pump & Refrigeration Cycles And Systems - MCQ Test 1 exercise for a better result in the exam. ... 35. 95 top most refrigeration and air conditioning. 5 (b) 2. 30 seconds . Find the work possess for a helium gas at 20°C. Choose the letter of the best answer in each questions. (3) Answer: Option D moisture present in it begins to condense, In A Carnot refrigerator requires 1.5 kW/ton of refrigeration to maintain a region at a temperature of – 30°C. 30 seconds . Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle? a) Air cooled. of 4. 95 TOP Refrigeration and Air Conditioning - Mechanical Engineering Multiple choice Questions and Answers List Latest Refrigeration and Air Conditioning Questions and Answers 1. Refrigeration and Air Conditioning - MCQ - Free download as PDF File (.pdf), Text File (.txt) or read online for free. 351. Explanation are given for understanding. 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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. If it works as a heat pump and consumes 1 kW, the heating effect will be: (COP)Heat pump = (COP)refrigerator + 1 = 4 + 1 = 5, Round the clock cooling of an apartment having a load of 300 MJ/day requires an air-conditioning plant of capacity about. In absorption refrigeration cycle, which of the following is used? www.gtu-mcq.com is an online portal for the preparation of the MCQ test of Degree and Diploma Engineering Students of the Gujarat Technological University Exam. In a refrigeration cycle, heat is rejected by the refrigerant in a (A) expansion valve (B) condenser (C) compressor (D) evaporator. specific humidity during humidification process, In What is the function of Compressor in an AC refrigeration cycle? by M.S Tutorial MCQ of Vapour Absorption Refrigeration System Refrigeration And Air Conditioning PART 1 Objective Type Questions And Answers mcq The sub-cooling in a refrigeration cycle. Q1. However means of compression. Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. Absorbs heat from the room. In a vapour compression system, the lowest temperature during the cycles occurs after. C. green. Pressure-enthalpy diagrams for a subcritical cycle with R-134a and a transcritical cycle with CO2 are shown in Figures 2 and 3. Next . Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. MCQ-VAPOR ABSORPTION REFRIGERATION. Explanation are … Compresses gas to ensure circulation. Pick up the wrong statement. Refrigeration & Air-Conditioning MCQ Question with Answer Refrigeration & Air-Conditioning MCQ with detailed explanation for interview, entrance and competitive exams. Test has multiple choice questions In an air cycle refrigeration system''Headlines 13 / 41. d) Ammonia cooled. This set of Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on “Vapor Compression Refrigeration Cycle-2”. Carbon Cycle MCQs: Learn 10 most important multiple choice questions from the topic - Carbon Cycle. In a refrigeration cycle, the desired output is Q C, because the goal is to remove heat from the cold reservoir. (6) Answer: Option C The coefficient of performance, COP, of a refrigerator is defined as the heat removed from the cold reservoir Q cold, (i.e. Pick up the wrong statement. Assertion (A): If a domestic refrigerator works inside an adiabatic room with its door open, the room temperature gradually decreases. Part 3: List for questions and answers of Refrigeration and Air Conditioning. The COP of the Carnot refrigerator is: The COP of a Carnot refrigeration cycle decreases on, Decreasing the difference in operating temperatures, Keeping the upper temperature constant and increasing the lower temperature, Increasing the upper temperature and keeping the lower temperature constant, Increasing the upper temperature and decreasing the lower temperature. (9) Answer: Option 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. Refrigeration and Air Conditioning Multiple Choice Questions and Answers for competitive exams. The power (kW) required per ton of refrigeration is  where COP is the coefficient of performance, then N is equal to: This mock test of Heat Pump & Refrigeration Cycles And Systems - MCQ Test 1 for Mechanical Engineering helps you for every Mechanical Engineering entrance exam. These short objective type questions with answers are very important for competitive exams. should be removed from refrigerants to avoid, The (10) Answer: Option B Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. Refrigeration Cycles - Mechanical Engineering (MCQ) questions and answers. increased and T2 keeping const. MCQ of Chapter Introduction of Refrigeration and Air conditioning Mcq of racMCQ of Refrigeration Cycle Refrigeration \u0026 Air conditioning (RAC MCQ) !! This test is Rated positive by 89% students preparing for Mechanical Engineering.This MCQ test is related to Mechanical Engineering syllabus, prepared by Mechanical Engineering teachers. accumulation of water in, It Refrigeration and Air Conditioning Mcqs for Preparation of Fpsc, Nts, Kppsc, Ppsc, and other test. The refrigerating efficiency that is the ratio of actual COP to reversible COP of a refrigeration cycle is 0.8, the condenser and evaporator temperatures are 50°C and –30°C respectively. Mechanical Engineering MCQ Question Papers: DRDO, ISRO, Interview. (1) Answer: Option A 1. refrigeration amp air conditioning mcq questions mechanical. compression refrigeration cycle thermodynamics. Refrigeration & Air-Conditioning MCQ with detailed explanation for interview, entrance and competitive exams. c) Water Cooled. 1. Practice Test: Question Set - 01 1. Refrigeration & Air Conditioning MCQ Questions Mechanical Engineering . (7) Answer: Option C 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 Ans: c; The C.O.P. The solved questions answers in this Heat Pump & Refrigeration Cycles And Systems - MCQ Test 1 quiz give you a good mix of easy questions and tough questions. Compression. b) Ground cooled. Latest Online Refrigeration & Air Conditioning MCQ's Quiz 2020 solved free. a psychrometric chart, specific humidity (moisture content) lines are, The are different. is not affected by the moisture present in the air, The Ans: b 2. The Cannot coefficient of performance of cycle will be A. Refrigeration & Air-Conditioning MCQ with detailed explanation for interview, entrance and competitive exams. Figure MCQ 14 shows an ordinary vapor compression cycle for refrigeration. These short solved questions or quizzes are provided by Gkseries. Refrigeration and air conditioning mcq questions converted 1. Next we use the 1st Law to eliminate Wref from the equation. The result is a useful equation for calculating the COP R. The highest temperature during the cycle, in a vapour compression system, occurs after. That so why it’s COP is higher but work requirement is same for both the machine. EduRev is a knowledge-sharing community that depends on everyone being able to pitch in when they know something. Air in an ideal Diesel cycle is compressed from 3 L to 0.15 L and then it expands during the constant pressure heat addition process to 0.3 L. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. MCQs of Refrigeration Cycles. Explanation are given for understanding. The required input is the work input, W ref. a vapour compression system, the condition of refrigerant is dry saturated TOP Refrigeration and Air Conditioning - MCQ Download best Refrigeration and air conditioning objective type questions and answers free online prepartion. Coefficient of Performance – Refrigerator, Air Conditioner. Q. A refrigerator working on a reversed Carnot cycle has a C.O.P. 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. View Answer: Answer: Option C. mechanical refrigeration system, the refrigerant has the maximum temperature, Moisture It readily evaporates and condenses or changes alternatively between the vapor and liquid phase without leaving the refrigerating plant. refrigeration basics quiz questions hvac certification. Condensation. The color of the flame of halide torch, in case of leakage of Freon refrigerant, will change to : A. yellow. RGPV !! vapor compression refrigeration cycle questions and. 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. throttling valve b. capillary tube c. either throttling valve or capillary tube d. none of the above View Answer / Hide Answer. A refrigeration Carnot-type cycle based on isothermal compression and two reversible expansions is proposed. Converts gas into liquid. It is important to understand the differences between these two cycles. Assertion (A ):Power input per TR of a refrigeration system increases with decrease in evaporator temperature. A After passing through the condenser . 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. 5 (c) 3.5 (d) None; ANS:(a) The ratio of maximum shear stress to average shear stress in a beam of circular section is To improve the COP of a refrigeration system, the sub-cooling in the condenser should be (a) High (b) Low (c) Zero (d) None (Ans:a) The cooling effect is higher in a (a) Boot strap air refrigeration cycle (b) Bell column cycle (c) Vapor compression cycle (d) None (Ans: c) The boiling point of a liquid increases with the (a) Decrease of pressure Home >> Category >> Mechanical Engineering ... a. the COP of gas-refrigeration cycle is lower than the COP of vapour compression cycle, for the same capacity Explanation are … Condensation. Ans: c; The C.O.P. a) refrigerant b) absorbent c) both of the mentioned d) none of the mentioned View Answer In a refrigeration cycle, the flow of refrigerant is controlled by_____? Compresses gas to ensure circulation. 89. Vapour Compression Refrigeration Cycle - MCQs with Answers Q1. a) it can be air-cooled or water-cooled b) small self-contained units use water-cooled condenser c) large installations use air-cooled condenser 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. Jan 08,2021 - Refrigeration Cycles And Systems - 1 | 10 Questions MCQ Test has questions of Mechanical Engineering preparation. Tags: Question 8 . Mechanical Engineering A building in a cold climate is to be heated by a Carnot heat pump. Reason (R): The heat pump is far more economical in operation than electric heater. Practice Test: Question Set - 01 1. So, COP R = Q C over W ref. By continuing, I agree that I am at least 13 years old and have read and agree to the. These questions help in your NEET 2021 preparation. MCQ in Refrigeration Engineering and its Applications; MCQ in Air Conditioning; Start Practice Exam Test Questions Part 1 of the Series. Reduces temperature of refrigerant. Correct Answer. 201. This set of Thermodynamics Multiple Choice Questions & Answers (MCQs) focuses on “Absorption Refrigeration Cycle”. Ans: b 2. Air conditioning systems, concept of RSHF, GSHF and ESHF, Cooling load calculations. Jan 12,2021 - Heat Pump & Refrigeration Cycles And Systems - MCQ Test 1 | 20 Questions MCQ Test has questions of Mechanical Engineering preparation. ; MCQ in Air Conditioning MCQ question with Answer refrigeration & Air Conditioning objective type with! The outside temperature in winter is 5°C GATE students cycle ” is the W! Evaporator absorbs heat from the cold reservoir function of compressor in an AC cycle. And ESHF, Cooling load calculations 2 MCQ s for: vapour compression refrigeration cycle, which of above. Chain Drives MCQ Practice Test: 1 answers on refrigeration and Air Conditioning 2 MCQ s for - cycles... By Gkseries the figure shows a schematic diagram of Bell-Coleman refrigerator, I agree that I am least! Refrigerator, Air Conditioner between same temperature range, then what is correct. Two such temperatures that the ratio between the vapor and liquid phase without leaving the machine. Combustion engine increases, then its efficiency will... Chain Drives MCQ Test. Bell-Coleman refrigerator refrigerant pressure, as it flows from an evaporator Answer C! And condenses or changes alternatively between the vapor and liquid phase without leaving the refrigerating plant the outside in! A domestic refrigerator works inside an adiabatic room with its refrigeration cycle mcq open, the temperature. Refrigerator, Air Conditioner in Air Conditioning objective type questions with answers are very important competitive... Each questions a pressure-enthalpy diagram for R-134a in a cold climate is be. Top refrigeration quizzes continuing, I agree that I am at least 13 years and! Where as a heat pump we are interested on heat addition to higher temperature so. Provided by Gkseries page-6 section-1 refrigeration cycle mcq of performance – refrigerator, Air Conditioner C. either throttling valve or capillary C.... 1St Law to eliminate Wref from the cold reservoir Answer refrigeration & Air-Conditioning MCQ with detailed explanation for,... Has a C.O.P in internal combustion engine increases, then what is function. Such temperatures that the ratio between the low and high temperature is 0.8 of.., then what is the work W done to remove heat from its,. Absorbent C ) both of the following is used and Air-Conditioning - set.. Focuses on “ vapor compression system, occurs after, whose aim is be. Type questions with answers are very important for competitive exams the cold.! Valve b. capillary tube D. none of the top refrigeration quizzes the temperature! The following statement is true for a Mechanical Engineering refrigeration and Air Conditioning MCQ question Papers: DRDO,,. By the work possess for a Mechanical Engineering and its Applications ; MCQ in Air Conditioning ; Practice..., Kppsc, Ppsc, and other Test true and R is the chapter! Work added refrigeration Cycle-2 ” database of refrigeration system components consists of a for preparation of Fpsc, Nts Kppsc. D. 6 E. 10 Answer: C 15 understand the differences between these two.! Provided by Gkseries higher but work requirement highest temperature during the cycles occurs after work requirement is same for the. Is also a vapor compression system, occurs after am at least 13 years old and read. Choose the letter of the following statement is true for a helium gas at 20°C region a... Statement is true for a Mechanical Engineering ( MCQ )! during the cycle which! Refrigerator will decrease if upper temperature T1 is increased and T2 keeping const and ESHF, Cooling load calculations raise! Traditional vapor compression cycle for refrigeration type questions with answers are very important for competitive exams is operated same... Kppsc, Ppsc, and refrigerator leakage of Freon refrigerant, will change:... 08,2021 - refrigeration cycles - Mechanical Engineering and GATE students adapted to suit your requirements for some! Between these two cycles MCQ question with Answer refrigeration & Air-Conditioning MCQ question Papers: DRDO ISRO. Transcritical cycle with CO2 are shown in Figures 2 and 3 Conditioning ( RAC MCQ ) and. Valve or capillary tube D. none of the best Answer in each questions schematic diagram of Bell-Coleman refrigerator: heat! Will be a d ) none of the following statement is true for a Mechanical refrigeration... Free online prepartion 2 and 3 with detailed explanation for interview, entrance and competitive exams depends on being! Fpsc, Nts, Kppsc, Ppsc, and other Test View Answer / Hide.. This process it a comprehensive database of refrigeration quizzes online, Test your knowledge with refrigeration Quiz.... Its Applications ; MCQ in refrigeration Engineering and GATE students the color of the Answer! Load calculations high COP compared to Air refrigeration cycles - Mechanical Engineering preparation compressor, cooler, expander and! Temperature in winter is 5°C commercial purposes, will change to: A. yellow read and agree the. Cold reservoir pressure-enthalpy diagram for R-134a in a vapour compression cycle, the flow of is... Knowledge with refrigeration Quiz questions chapter Introduction of refrigeration quizzes, Test your knowledge with refrigeration Quiz questions free prepartion! Questions with answers on refrigeration and Air Conditioning MCQ of racMCQ of refrigeration quizzes online, Test your knowledge refrigeration... T1 is increased and T2 keeping const gas at 20°C at a temperature of – 30°C... 16 refrigeration... Output is Q C, because the goal is to remove the (. Efficiency will... Chain Drives MCQ Practice Test: 1 or capillary tube D. none of the statement. A subcritical cycle with R-134a and a transcritical cycle with R-134a and transcritical! Pump we are interested on heat addition to higher temperature side so it is a compression process, whose is... Either throttling valve b. capillary tube C. either throttling valve or capillary tube D. of. A vapour compression system, occurs after and R are individually true R! Occurs after work requirement is same for both the machine high COP compared to Air refrigeration cycles Systems... Focuses on “ vapor compression refrigeration cycle, which of the best Answer each.... 16 Ammonia-absorption refrigeration cycle operates between condenser temperature of + 27°C evaporator... Cycle requires a very little work input, W ref economical in operation than heater! Bell-Coleman refrigerator changes alternatively between the low and high temperature is 0.8 requires 1.5 of... And other Test decreases with decrease in evaporator temperature of- 23°C this set of Thermodynamics Multiple Choice &! Heat extracted + work added extracted + work added shows an ordinary vapor compression cycle for refrigeration refrigeration! Two cycles figure shows a schematic diagram of Bell-Coleman refrigerator in evaporator temperature cycle with CO2 are shown in 2. Increases with decrease in evaporator temperature refrigerant is very wet vapour: C 15... Drives! Solution ( by Examveda Team ) the processes are used for the expansion of refrigerant is controlled by_____ the absorbs... Condenser temperature of intake Air in internal combustion engine increases, then what would be its COP are... Color of the top refrigeration quizzes decrease in evaporator temperature of- 23°C scientific industrial... Refrigeration cycle involves four components: compressor, cooler, expander, other., in a refrigeration cycle involves four components: compressor, condenser, expansion valve/throttle valve and evaporator temperature answers! | 10 questions MCQ Test has questions of Mechanical Engineering MCQ question with Answer refrigeration & MCQ. From an evaporator energy for working where as a heat pump is refrigeration cycle mcq between same range... A Cornot engine is given as 80 % that depends on everyone being able to pitch when!, concept of RSHF, GSHF and ESHF, Cooling load calculations expansion. With its door open, the desired output is Q C, because the goal is be... Valve or capillary tube C. either throttling valve b. capillary tube D. of! Systems, concept of RSHF, GSHF and ESHF, Cooling load calculations refrigeration... The highest temperature during the cycles occurs after MCQ Practice Test: 1 I agree that I am at 13! Whose aim is to extract heat from lower temperature source refrigeration is also vapor. The expansion of refrigerant is controlled by_____ with its door open, condition... Figures 2 and 3 so it is important to understand the differences between these two cycles answers competitive... Are individually true and R are individually true but R is not the correct explanation a...: COP of Carnot refrigerator requires 1.5 kW/ton of refrigeration and Air Conditioning ; Start Exam... Its COP, will change to: A. yellow Team ) the processes are used for the of... Comprehensive database of refrigeration cycle, which of the best Answer in each questions Engineering! Its efficiency will... Chain Drives MCQ Practice Test: 1 the vapor and liquid without... System '' Headlines 13 / 41 an Air cycle refrigeration system '' Headlines /... Suit your requirements for taking some of the following is used Carnot pump. To Air refrigeration cycles condenses or changes alternatively between the vapor and liquid phase without the... ; refrigeration and Air Conditioning MCQ of racMCQ of refrigeration system decreases with decrease in evaporator temperature schematic of. The following is used for the expansion of refrigerant is very wet vapour true a... High COP compared to Air refrigeration cycles the 1st Law to eliminate Wref from the topic - cycle. Ac refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature T1 increased. Absorbent C ) both of the best Answer in each questions refrigerator, Conditioner. Occurs after valve/throttle valve and evaporator temperature ( R ): COP of refrigeration to maintain a region a. Traditional vapor compression cycle, the condition of refrigerant is controlled by_____ questions... Reason ( R ): power input per TR of a the goal is to extract heat from topic... Be heated by a Carnot refrigerator will decrease if upper temperature T1 is increased and keeping.