and low freezing point, … Then, check for the pressure again. 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, Theory of Machines - Friction Clutches, Breaks, Dynamometer, I.C. The refrigerant for a refrigerator should have A. high sensible heat B. high total heat C. high latent heat D. low latent heat E. low sensible heat ANSWER: C 7. Q1. Engines - Two-Stroke & Non-Conventional Engines. Refrigeration and Air Conditioning MCQ Questions 1-One ton of refrigeration is equal to (A) 21 KJ/min (B) 105 KJ/min (C) 210 KJ/min (D) 420 KJ/min 2-A low side float valve maintains the level of refrigerant in (A) Flooded evaporator (B) Evaporator (C) Condenser (D) Compressor 3-When wet bulb and dry bulb temperature … A In evaporator . 25. C High latent heat . Question No : 43 The leaks in a refrigeration system using Freon are detected by, Question No : 44 In mechanical refrigeration system, the refrigerant has the maximum temperature, Question No : 45 The lowest thermal diffusivity is of. IF YOU THINK THAT ABOVE POSTED MCQ IS WRONG. Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. D Low latent heat . All Rights Reserved. c. vapour absorption refrigeration system. Rating of a domestic refrigerator is of the order of (A) 0.1 ton (B) 5 tons (C) 10 tons (D) 40 tons. The most commonly used refrigerant in refrigerators is R 134a which is tetrafluoroethylene, which does not deteriorate ozone layers. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be. View Answer / Hide Answer. ⇒ The refrigerant for a refrigerator should have high sensible heat high total heat high latent heat low latent heat ⇒ A reversible engine has ideal thermal efficiency of 30%. Rating of a domestic refrigerator is of the order of (a) 0.1 ton (b) 5 tons (c) 10 tons (d) 40 tons (e) 100 tons. B. Refrigerant recovery unit and cylinder. If it gives a value between 0 and 1 psi, you’re still okay. a. dual refrigeration system. A refrigerant should have _____? The refrigerant for a refrigerator should have (a) high sensible heat (b) high total heat (c) high latent heat (d) low latent heat (e) low sensible heat Ans: c; Rating of a domestic refrigerator is of the order of (a) 0.1 ton (b) 5 tons (c) 10 tons (d) 40 tons (e) 100 tons. But if it is higher than 1 psi, open the valve for about 4 to 10 seconds to let out some air. ... A refrigerant should have (A) Tow specific heat of liquid (B) High boiling point (C) … Pick up the wrong statement. B High total heat . high sensible heat. If you notice that the items in your refrigerator are a little on the warmer side, it could be because of a freon leak. Usually, one of … The use of R600a and R290 hydrocarbons as refrigerant fluids has been consolidating itself and gaining space in the market. Combining the noncompatible refrigerants R-12 and R134a will lock up … Refrigerants - MCQs with Answers. Question No : 47 The refrigerant for a refrigerator should have, Question No : 48 In vapour compression cycle the condition off refrigerant is dry saturated vapour, Question No : 49 The domestic refrigerator uses following type of compressor, Competitive Exam India | Copyright @2017-2018 | About Us | Contact Us, Hosting partner DigitalOcean - Click here to get $10 joining bonus, DigitalOcean - Click here to get $10 joining bonus. Unfortunately, when your refrigerator develops a freon leak, the appliance will not be able to run properly. true refrigeration. B. Freon is a greenhouse gas that can damage the ozone if it gets into the air. low latent heat. By representing, at the same time, a good solution from a technical point of view as well as a response to the need to cause less environment impact, they have been adopted by various refrigeration equipment manufacturers. Because high specific heat decreases the refrigerating effect per kg of refrigerant and high latent heat at low temperature increases the … Besides causing health issues, Freon has a disastrous effect on the environment. When two refrigerating cycles are used in series with two different refrigerants, the system is known as. Both refrigerators and automobiles use R-134a as a refrigerant, and adults can buy it at most automobile parts stores. The Refrigerant System in the Refrigerator Another important factor to consider before repairing or replacing your fridge is the type of refrigerant in your fridge. D. Superheat and sensible heat of a refrigerant are same © Copyright 2016. If your fridge uses a refrigerant like R12, R22, or R502, then it’s high time you plan on buying a new fridge. 0.1 ton B. Under the new Refrigerant Handling Code of Practice, an acceptable method/methods of recovering refrigerant from a small contained system such as a domestic refrigerator would be: A. Purging to atmosphere if only small amounts involved. PLEASE COMMENT BELOW WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION. Leave a Reply Cancel reply. 6. The refrigerant for a refrigerator should have (a) high sensible heat (b) high total heat (c) high latent heat (d) low latent heat (e) low sensible heat Ans: c. 26. WebstaurantStore / Food Service Resources / Blog. Q&A for section 608 technicians concerning servicing appliances, purchasing or selling refrigerant, leak repair, how to become certified, record keeping, and other general topics. Easy leak detection possible; Non-Toxic; Environmental friendly; Cheap; Easily available; Easily stored; Desirable and Undesirable Properties of Water as a Refrigerant C. It's important that every business owner who uses a refrigerator or freezer be knowledgeable of refrigerant rules and regulations. This results in the food, drinks and produce in your refrigerator not being kept as cold and fresh as it should be. 1.33 2.33 3.33 4.33 Refrigeration and air conditioning mcq questions converted 1. (a) A refrigerant should have low latent heat (b) If operating temperature of system is low, then refrigerant with low boiling point should be used (c) Precooling and subcooling bf refrigerant … Air Traffic Controller Interview Questions ; ... And in case of refrigeration the process is first reversed that is we have to supply work to obtain lower temperature or say for that removal of heat. b. cascade refrigeration system. Ans: a. C. Pre-cooling and sub-cooling bf refrigerant are same. Pick up the wrong statement ? Ans: a; The COP of a domestic refrigerator … Ans: b 2. One tonne of refrigerant is used. If there’s enough Freon in your refrigerator, the gauge should read 0 psi. Whether they remove Freon from a refrigerator or take Freon out of an AC unit, the technician should follow specific practices per EPA regulations. Freon is a refrigerant used to keep your fridge cold that needs to be removed before it can be thrown away. Refrigeration & Air-Conditioning MCQ with detailed explanation for interview, entrance and competitive exams. high latent heat. In ammonia-hydrogen (Electrolux) refrigerator, no compressor, pump or fan is required. A refrigerant should have low latent heat. C. One tonne of water can be converted into ice. I have found though 134a is 134a the only difference … Thus performance of refrigeration is just reversed . Vapor-compression uses a circulating liquid refrigerant as the medium which absorbs and removes heat from the space to be cooled and subsequently rejects that heat elsewhere. Rating of a domestic refrigerator is of the order of A. Solution (By Examveda Team) -The refrigerant should have low boiling point and low freezing point. The refrigerant for a refrigerator should have (A) high sensible heat (B) high total heat (C) high latent heat (D) low latent heat. 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. Refrigerators manufactured from 1995 to the present typically use R-134a, an HFC, as a refrigerant. Refrigerator contains the heat pump, it pumps the heat out so that your system remains cold. A High sensible heat . ... 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. 120) The refrigerant for a refrigerator should have. Repairing Leaks and Faulty Parts Get a new evaporator coil if it needs to be replaced. Some other desirable properties that a refrigerant should have include: Non-Corrosive; Non-flammable and Non-explosive; Stable; Compatible with crank case oil, oil seals, gaskets, etc. 5 ton C. 10 ton D. 40 ton E. 100 ton ANSWER: A 8. The refrigerant for a refrigerator should have . Because some bounty programs have required specifications for appliances (e.g., must be in working condition, of a minimum age and/or dimension), you may also need to confirm that your appliance is acceptable. Those certified by the Environmental Protection Agency (EPA) can evacuate freon with special tools. D. One tonne of ice when melts from at 0 0 C in 24 hours,the refrigeration effect produced is equivalent to 210 kJ/min Answer Explanation. 27. Question No : 46 Which of the following refrigerants has lowest freezing point? high total heat. - It must have low specific heat and high latent heat. What Restaurants Need to Know About New Refrigerant Regulations. 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. Answer is: high latent heat. E Pareeksha (MCQ) Class 4 Oral; ... system is overcharged with refrigerant b] suction valves were leaking slightly c] the system was low on refrigerant ... Refrigerator provides so many services & makes your life so restful but when your refrigerator is out of order rest of your also goes out. A refrigerant leak is a fairly serious matter, especially if the refrigerator is an older one that contains Freon. Question is ⇒ A good refrigerant should have., Options are ⇒ (A) high latent heat of vaporisation and low freezing point, (B) high operating pressures and low freezing point, (C) high specific volume and high latent heat of vaporisation, (D) low C.O.P. First, you should check with your electric utility to see if a bounty program is offered in your area (see the text box). Engines - Engine Friction & Lubrication, Heat Rejection & Cooling, Theory of Machines - Static and Dynamic Force Analysis, Balancing, I.C. Here at On-Time Appliance we use the large 30# cans but this is not piratical for the average person who owns a refrigerator. If operating temperature of system is low, then refrigerant with low boiling point should be used. d. none of the above. ... the refrigerant has the maximum temperature . This implies that there is no pressure in your Freon line. Refrigerant R143a is used in automobile air conditioning which is trifluoroethane and R22 of room A / C is used for chlorodifluoromethane. If you own a refrigerator built after 1995 chances are it uses 134a coolant. Figure 1 depicts a typical, single-stage vapor-compression system. A refrigerant should have _____? Explanation: More Questions on Heat transfer Objective Questions with Answers MCQ On heat transfer Objective Questions with Answers MCQ refrigeration and air conditioning which is trifluoroethane R22! D. 40 ton E. 100 ton ANSWER: a 8 those certified By the Environmental Protection (! Gives a value between 0 and 1 psi, you ’ re still okay EPA ) can evacuate freon special! Explanation: More Questions on heat transfer Objective Questions with Answers MCQ refrigeration and air conditioning which is trifluoroethane R22! Converted 1 rules and Regulations issues, freon has a disastrous effect on the environment that your system cold. 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