All Rights Reserved. d. none of the above. true refrigeration. C High latent heat . 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 … WebstaurantStore / Food Service Resources / Blog. It's important that every business owner who uses a refrigerator or freezer be knowledgeable of refrigerant rules and regulations. 25. A High sensible 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. First, you should check with your electric utility to see if a bounty program is offered in your area (see the text box). When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be. c. vapour absorption refrigeration system. If there’s enough Freon in your refrigerator, the gauge should read 0 psi. 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. B. A refrigerant should have _____? high sensible heat. D. Superheat and sensible heat of a refrigerant are same 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. Refrigerant R143a is used in automobile air conditioning which is trifluoroethane and R22 of room A / C is used for chlorodifluoromethane. A refrigerant should have _____? But if it is higher than 1 psi, open the valve for about 4 to 10 seconds to let out some air. Refrigeration & Air-Conditioning MCQ with detailed explanation for interview, entrance and competitive exams. 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. Ans: a; The COP of a domestic refrigerator … C. One tonne of water can be converted into ice. 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. 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. - It must have low specific heat and high latent heat. Ans: a. Answer is: high 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. and low freezing point, … C. ⇒ 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%. If you notice that the items in your refrigerator are a little on the warmer side, it could be because of a freon leak. Q1. Easy leak detection possible; Non-Toxic; Environmental friendly; Cheap; Easily available; Easily stored; Desirable and Undesirable Properties of Water as a Refrigerant 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 ANSWER: C 7. a. dual refrigeration system. A refrigerant should have low latent heat. One tonne of refrigerant is used. 1.33 2.33 3.33 4.33 Solution (By Examveda Team) -The refrigerant should have low boiling point and low freezing point. Pick up the wrong statement. 27. 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. Whether they remove Freon from a refrigerator or take Freon out of an AC unit, the technician should follow specific practices per EPA regulations. Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. This implies that there is no pressure in your Freon line. Repairing Leaks and Faulty Parts Get a new evaporator coil if it needs to be replaced. Refrigerators manufactured from 1995 to the present typically use R-134a, an HFC, as a refrigerant. high latent heat. Refrigerants - MCQs with Answers. What Restaurants Need to Know About New Refrigerant Regulations. Rating of a domestic refrigerator is of the order of A. Rating of a domestic refrigerator is of the order of (A) 0.1 ton (B) 5 tons (C) 10 tons (D) 40 tons. (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 … 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 refrigerant should have (A) Tow specific heat of liquid (B) High boiling point (C) … high total heat. Thus performance of refrigeration is just reversed . 5 ton C. 10 ton D. 40 ton E. 100 ton ANSWER: A 8. A In evaporator . b. cascade refrigeration system. I have found though 134a is 134a the only difference … D Low latent heat . This results in the food, drinks and produce in your refrigerator not being kept as cold and fresh as it should be. If it gives a value between 0 and 1 psi, you’re still okay. Freon is a refrigerant used to keep your fridge cold that needs to be removed before it can be thrown away. If your fridge uses a refrigerant like R12, R22, or R502, then it’s high time you plan on buying a new fridge. Both refrigerators and automobiles use R-134a as a refrigerant, and adults can buy it at most automobile parts stores. If operating temperature of system is low, then refrigerant with low boiling point should be used. If you own a refrigerator built after 1995 chances are it uses 134a coolant. Then, check for the pressure again. A refrigerant leak is a fairly serious matter, especially if the refrigerator is an older one that contains Freon. IF YOU THINK THAT ABOVE POSTED MCQ IS WRONG. 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. Figure 1 depicts a typical, single-stage vapor-compression system. ... the refrigerant has the maximum temperature . 120) The refrigerant for a refrigerator should have. © Copyright 2016. B High total heat . 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 … 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. 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. B. Refrigerant recovery unit and cylinder. Engines - Engine Friction & Lubrication, Heat Rejection & Cooling, Theory of Machines - Static and Dynamic Force Analysis, Balancing, I.C. In ammonia-hydrogen (Electrolux) refrigerator, no compressor, pump or fan is required. C. Pre-cooling and sub-cooling bf refrigerant are same. Usually, one of … PLEASE COMMENT BELOW WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION. Unfortunately, when your refrigerator develops a freon leak, the appliance will not be able to run properly. 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 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. Ans: b 2. Those certified by the Environmental Protection Agency (EPA) can evacuate freon with special tools. Refrigerator contains the heat pump, it pumps the heat out so that your system remains cold. When two refrigerating cycles are used in series with two different refrigerants, the system is known as. Besides causing health issues, Freon has a disastrous effect on the environment. Engines - Two-Stroke & Non-Conventional Engines. Here at On-Time Appliance we use the large 30# cans but this is not piratical for the average person who owns a 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. 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. 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