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