C High latent heat . C. One tonne of water can be converted into ice. d. none of the above. Freon is a refrigerant used to keep your fridge cold that needs to be removed before it can be thrown away. IF YOU THINK THAT ABOVE POSTED MCQ IS WRONG. If you own a refrigerator built after 1995 chances are it uses 134a coolant. - It must have low specific heat and high latent heat. Pick up the wrong statement ? WebstaurantStore / Food Service Resources / Blog. This results in the food, drinks and produce in your refrigerator not being kept as cold and fresh as it should be. 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. 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. Both refrigerators and automobiles use R-134a as a refrigerant, and adults can buy it at most automobile parts stores. and low freezing point, … ... the refrigerant has the maximum temperature . Because high specific heat decreases the refrigerating effect per kg of refrigerant and high latent heat at low temperature increases the … Here at On-Time Appliance we use the large 30# cans but this is not piratical for the average person who owns a refrigerator. A refrigerant leak is a fairly serious matter, especially if the refrigerator is an older one that contains Freon. B High total heat . Easy leak detection possible; Non-Toxic; Environmental friendly; Cheap; Easily available; Easily stored; Desirable and Undesirable Properties of Water as a Refrigerant B. Refrigerant recovery unit and cylinder. ⇒ 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%. What Restaurants Need to Know About New Refrigerant Regulations. Those certified by the Environmental Protection Agency (EPA) can evacuate freon with special tools. Rating of a domestic refrigerator is of the order of A. 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. 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. 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 … If operating temperature of system is low, then refrigerant with low boiling point should be used. Usually, one of … 5 ton C. 10 ton D. 40 ton E. 100 ton ANSWER: A 8. (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 … Explanation: More Questions on Heat transfer Objective Questions with Answers MCQ Q1. I have found though 134a is 134a the only difference … c. vapour absorption refrigeration system. If your fridge uses a refrigerant like R12, R22, or R502, then it’s high time you plan on buying a new fridge. Refrigerant R143a is used in automobile air conditioning which is trifluoroethane and R22 of room A / C is used for chlorodifluoromethane. 27. View Answer / Hide Answer. ... A refrigerant should have (A) Tow specific heat of liquid (B) High boiling point (C) … 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. low latent heat. Refrigeration and air conditioning mcq questions converted 1. This implies that there is no pressure in your Freon line. 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. 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. Engines - Two-Stroke & Non-Conventional Engines. Ans: a. If there’s enough Freon in your refrigerator, the gauge should read 0 psi. high 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. If it gives a value between 0 and 1 psi, you’re still okay. Figure 1 depicts a typical, single-stage vapor-compression system. true refrigeration. 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. Whether they remove Freon from a refrigerator or take Freon out of an AC unit, the technician should follow specific practices per EPA regulations. Refrigerants - MCQs with Answers. The refrigerant for a refrigerator should have . It's important that every business owner who uses a refrigerator or freezer be knowledgeable of refrigerant rules and regulations. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be. Besides causing health issues, Freon has a disastrous effect on the environment. Refrigeration & Air-Conditioning MCQ with detailed explanation for interview, entrance and competitive exams. © Copyright 2016. If you notice that the items in your refrigerator are a little on the warmer side, it could be because of a freon leak. D. Superheat and sensible heat of a refrigerant are same ... 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. A refrigerant should have _____? 1.33 2.33 3.33 4.33 high sensible heat. But if it is higher than 1 psi, open the valve for about 4 to 10 seconds to let out some air. C. Refrigerator contains the heat pump, it pumps the heat out so that your system remains cold. A refrigerant should have _____? Question No : 46 Which of the following refrigerants has lowest freezing point? A In evaporator . Repairing Leaks and Faulty Parts Get a new evaporator coil if it needs to be replaced. Ans: a; The COP of a domestic refrigerator … C. Pre-cooling and sub-cooling bf refrigerant are same. 25. When two refrigerating cycles are used in series with two different refrigerants, the system is known as. 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. 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 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. One tonne of refrigerant is used. All Rights Reserved. B. a. dual refrigeration system. Pick up the wrong statement. Rating of a domestic refrigerator is of the order of (A) 0.1 ton (B) 5 tons (C) 10 tons (D) 40 tons. 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. Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. 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. Unfortunately, when your refrigerator develops a freon leak, the appliance will not be able to run properly. The most commonly used refrigerant in refrigerators is R 134a which is tetrafluoroethylene, which does not deteriorate ozone layers. high total heat. The refrigerant for a refrigerator should have (A) high sensible heat (B) high total heat (C) high latent heat (D) low 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. 26. In ammonia-hydrogen (Electrolux) refrigerator, no compressor, pump or fan is required. Solution (By Examveda Team) -The refrigerant should have low boiling point and low freezing point. Freon is a greenhouse gas that can damage the ozone if it gets into the air. Answer Explanation. 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. Then, check for the pressure again. Refrigerators manufactured from 1995 to the present typically use R-134a, an HFC, as a refrigerant. 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. 6. Thus performance of refrigeration is just reversed . Answer is: high latent heat. 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. Engines - Engine Friction & Lubrication, Heat Rejection & Cooling, Theory of Machines - Static and Dynamic Force Analysis, Balancing, I.C. Leave a Reply Cancel reply. PLEASE COMMENT BELOW WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION. 0.1 ton B. Combining the noncompatible refrigerants R-12 and R134a will lock up … 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. b. cascade refrigeration system. A High sensible heat . The use of R600a and R290 hydrocarbons as refrigerant fluids has been consolidating itself and gaining space in the market. 120) The refrigerant for a refrigerator should have. 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