Then, check for the pressure again. Figure 1 depicts a typical, single-stage vapor-compression system. Easy leak detection possible; Non-Toxic; Environmental friendly; Cheap; Easily available; Easily stored; Desirable and Undesirable Properties of Water as a Refrigerant PLEASE COMMENT BELOW WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION. Pick up the wrong statement. Thus performance of refrigeration is just reversed . B. Refrigerant recovery unit and cylinder. I have found though 134a is 134a the only difference … Refrigeration & Air-Conditioning MCQ with detailed explanation for interview, entrance and competitive exams. high total heat. a. dual refrigeration system. Freon is a refrigerant used to keep your fridge cold that needs to be removed before it can be thrown away. Ans: a; The COP of a domestic refrigerator … ... 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. Refrigeration and air conditioning mcq questions converted 1. Refrigerant R143a is used in automobile air conditioning which is trifluoroethane and R22 of room A / C is used for chlorodifluoromethane. C. Pre-cooling and sub-cooling bf refrigerant are same. 5 ton C. 10 ton D. 40 ton E. 100 ton ANSWER: A 8. D Low latent heat . high sensible heat. 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. A High sensible heat . D. Superheat and sensible heat of a refrigerant are same Both refrigerators and automobiles use R-134a as a refrigerant, and adults can buy it at most automobile parts stores. A refrigerant should have low latent heat. Answer is: high latent heat. 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. 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. 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. Unfortunately, when your refrigerator develops a freon leak, the appliance will not be able to run properly. Pick up the wrong statement ? b. cascade refrigeration system. low latent heat. One tonne of refrigerant is used. 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. If it gives a value between 0 and 1 psi, you’re still okay. 6. If operating temperature of system is low, then refrigerant with low boiling point should be used. and low freezing point, … 1.33 2.33 3.33 4.33 Whether they remove Freon from a refrigerator or take Freon out of an AC unit, the technician should follow specific practices per EPA regulations. In ammonia-hydrogen (Electrolux) refrigerator, no compressor, pump or fan is required. ... A refrigerant should have (A) Tow specific heat of liquid (B) High boiling point (C) … Freon is a greenhouse gas that can damage the ozone if it gets into the air. Ans: b 2. 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. This implies that there is no pressure in your Freon line. The refrigerant for a refrigerator should have . C. One tonne of water can be converted into ice. IF YOU THINK THAT ABOVE POSTED MCQ IS WRONG. ⇒ 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%. 0.1 ton B. d. none of the above. The most commonly used refrigerant in refrigerators is R 134a which is tetrafluoroethylene, which does not deteriorate ozone layers. 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 … Refrigerator contains the heat pump, it pumps the heat out so that your system remains cold. 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. View Answer / Hide Answer. Refrigerators manufactured from 1995 to the present typically use R-134a, an HFC, as a refrigerant. Because high specific heat decreases the refrigerating effect per kg of refrigerant and high latent heat at low temperature increases the … First, you should check with your electric utility to see if a bounty program is offered in your area (see the text box). A In evaporator . 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 refrigerant should have _____? If you own a refrigerator built after 1995 chances are it uses 134a coolant. Engines - Two-Stroke & Non-Conventional Engines. When two refrigerating cycles are used in series with two different refrigerants, the system is known as. Combining the noncompatible refrigerants R-12 and R134a will lock up … B High total 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. But if it is higher than 1 psi, open the valve for about 4 to 10 seconds to let out some air. Answer Explanation. Rating of a domestic refrigerator is of the order of (A) 0.1 ton (B) 5 tons (C) 10 tons (D) 40 tons. 120) The refrigerant for a refrigerator should have. (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 … Refrigerants - MCQs with Answers. - It must have low specific heat and high latent heat. C High latent heat . high latent heat. Besides causing health issues, Freon has a disastrous effect on the environment. © Copyright 2016. c. vapour absorption refrigeration system. 25. ... the refrigerant has the maximum temperature . Explanation: More Questions on Heat transfer Objective Questions with Answers MCQ When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be. A refrigerant leak is a fairly serious matter, especially if the refrigerator is an older one that contains Freon. Here at On-Time Appliance we use the large 30# cans but this is not piratical for the average person who owns a refrigerator. Q1. Engines - Engine Friction & Lubrication, Heat Rejection & Cooling, Theory of Machines - Static and Dynamic Force Analysis, Balancing, I.C. 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. 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. Ans: a. 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. The use of R600a and R290 hydrocarbons as refrigerant fluids has been consolidating itself and gaining space in the market. It's important that every business owner who uses a refrigerator or freezer be knowledgeable of refrigerant rules and regulations. Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. Solution (By Examveda Team) -The refrigerant should have low boiling point and low freezing point. Those certified by the Environmental Protection Agency (EPA) can evacuate freon with special tools. 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. 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. 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. Leave a Reply Cancel reply. All Rights Reserved. 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. 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. Question No : 46 Which of the following refrigerants has lowest freezing point? 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. 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. true refrigeration. If your fridge uses a refrigerant like R12, R22, or R502, then it’s high time you plan on buying a new fridge. If there’s enough Freon in your refrigerator, the gauge should read 0 psi. C. WebstaurantStore / Food Service Resources / Blog. 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. Rating of a domestic refrigerator is of the order of A. What Restaurants Need to Know About New Refrigerant Regulations. 27. B. If you notice that the items in your refrigerator are a little on the warmer side, it could be because of a freon leak. Repairing Leaks and Faulty Parts Get a new evaporator coil if it needs to be replaced. This results in the food, drinks and produce in your refrigerator not being kept as cold and fresh as it should be. Usually, one of … 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 Before it can be converted into ice especially if the refrigerator is of the order a! No compressor, pump or fan is required Air-Conditioning MCQ with detailed explanation for,. 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