Home / All Categories / Networking / LAN Standards / 1. 2. The main obstacle to the switch to refrigerants with a lower GWP (like R32) is their moderate flammability risk, which means that their use is not recommended in large quantities inside industrial systems. You can send your comments directly at info@mechanicaltutorial.com. 8. Freon R22 is one of the most widely used R22 refrigerant brands in China. Correct Answer. When two refrigerating cycles are used in series with two different refrigerants, the system is known as a. dual refrigeration system b. cascade refrigeration system c. vapour absorption refrigeration system d. none of the above View Answer / Hide Answer The right choice of refrigerant depends on the situation at hand. Given below is the stretching vibration of a diatomic molecule. Multiple Choice Questions on Algae; MCQ on Bioinformatics- Biological databases; a. Diode bridge circuit . Registered R.E.A. Chances are, if you have an AC system over ten years old, you are most likely using this refrigerant! The cooperative learning method which combines whole class learning plus heterogeneous small groups … A. by . The most promising alternatives for large industrial air-conditioning systems would seem to be R1234ze and R1234zd. The most widely used refrigerant control which consists of a bellows or a diaphragm chamber connected to a temperature sensing bulb by means of a small capillary tube is a/an a) thermostatic expansion valve b) automatic expansion valve c) low pressure float valve d) hand operated expansion valve e) high pressure float valve Answer: A 10% b. Fill the blank with the suitable option. Hence, we have only two trigrams from the given sentence – ‘Google search engine’ and ‘search engine India’. 8. Fluorocarbons, especially chlorofluorocarbons, became commonplace in the 20th century, but they are being phased out because of their ozone depletion … The fluorescence is mainly results from which of the following transitions? Photovoltaic cells or solar cells convert (A) thermal energy into electricity. Ammonia to continue being the most widely used natural refrigerant Published on May 15, 2019 Ammonia (R-717) accounted for 60% of the market share for natural refrigerants in 2014. c) Mannol. Freon group of refrigerants are (A) Inflammable (B) Toxic (C) Non-inflammable and … But they are the greenest refrigerants in the market. The most widely used refrigerant metering device, which consists of a pressure-sensitive bellows or diaphragm connected to a temperature sensing bulb, is a/an: a. Thermostatic expansion valve b. With the current critical phase, the planet is facing in terms of climate balance, the aim is to continue to reduce the quantity of HFCs emitted gradually, so as to reach an overall reduction of 79% compared to 2015 emission levels by the year 2030. I believe that in every phrase there is scope for improvement and that every original version of a text should be perfected, by fine-tuning the words until a truly special result is achieved. Tube wells B. Perennial Canals C. Karez D. Dams. Related MCQs: Any method of teaching which involves two or more students, can be termed as_____? MCQ on Fluorescence spectroscopy: Page-8. Some refrigerants with smaller quantities of the damaging components are being used but even they are scheduled for oblivion (in 2020). Which of the following is a line source in fluorometry (A) Mercury vapor lamp (B) Xenon discharge lamp (C) Deuterium lamp (D) Lasers. R12: CCl2F2 dichlorofluoromethane, used for refrigeration systems at … AHR2021 – First moved, then cancelled – and the ASHRAE Meeting will also be online. c. 300 – 2000 nm . The _____ is the currency most widely used as a reserve asset. The most widely used solar material is (A) arsenic. B. Diffuse radiation only. A) euro B) Japanese yen C) U.S. dollar D) British pound. The main characteristics of the most commonly used natural refrigerants are summarised in the following table: (A) P and S (B) Q and R (C) P only (D) S only . Registered office: Via Nino Bixio, 6 – 35131, Padova ITALY V.A.T. d) pUC 19. first most widely used refrigerant. Broad gauge is the most widely used rail gauge in India. In this regard, European Community legislation is one of the most advanced in the world, thanks to its regulations promoting the use of refrigerants with a low global warming potential (GWP). As far as heat pumps are concerned, 80% of those sold in 2019 used R410A (with R134A in second place). Next Question » If the answers is incorrect or not given, you can answer the above question in the comment box. Hydrofluorocarbons. The alarming climate issue is one of the main reasons why such great attention is being devoted to the emissions caused by refrigerants. C. Direct as well as diffuse radiation. Which from the following is termed as student-centered learning method? Refrigerants: which were the most widely used at a global level in the last year? 30. MCQ in Modulation Part 18 as one of the Communications Engineering topic. 2. Balanced modulator . Electric Traction . Given the variable degree of environmental impact, it is important to monitor their use. Which of the following is the most widely used external memory data structure? In fact, most refrigerators in the Indian market are now on R-600A and there are no reported incidents of any accidents due to the same. 1 - 20 of 20 Products View Test Prep - Topic 7 MCQ with answers from BUSS 2058 at University of South Australia. The wireless LAN specification is … (D) solar radiation into kinetic energy. The most widely used refrigerant control, which consists of a bellows or a diaphragm chamber connected to a temperature sensing bulb by means of a small capillary tube is a/an a) hand operated expansion valve b) thermostatic expansion valve c) automatic expansion valve d) high pressure float valve e) low pressure float valve Answer: B Are low-pressure pumps b. Page-3 section-1 Many manufacturers are moving towards the use of R32 and R290 for units designed for domestic use (with emission values similar to the European average). Holiday schedule. (C) silicon. A widely used balanced modulator is called the . d. 400 – 7000 nm Differential current flow between t... Submerged arc welding is: a. an oxyacetylene welding process b. Power Engineering | Multiple Choice | Questions and Answers | Test bank | Chapter, The cross-section of a Bourdon tube is generally a) circular b) round c) cylindrical d) spherical e) oval Answer: E. Air conditioning ducts are classified as: a. Answer: (c) Stop words are words which are filtered out before or after processing of natural language data. MCQ on IR spectroscopy: Page-2. What is Callus? MCQ Biology - Learning Biology through MCQs. (D) steel. C - Stacks and Queues. Dichlorodifluoromethane, or R-12 in the industry, is nontoxic, nonflammable, colorless and, when used in low concentrations, odorless. 400 – 700 nm . c) 2 . a) Emitter-coupled logic b) Transistor-transistor logic c) CMOS logic family d) NMOS logic Answer: b Explanation: Transistor-transistor logic is the most widely employed logic family. Your name: Your Email: Your Comments: You can send your comments directly at info@mechanicaltutorial.com. 3. Practice these MCQ questions and answers for preparation of various competitive and entrance exams. Questions and answers - MCQ with explanation on Computer Science subjects like System Architecture, Introduction to Management, Math For Computer Science, DBMS, C Programming, System Analysis and Design, Data Structure and Algorithm Analysis, OOP and Java, Client Server Application Development, Data Communication and Computer Networks, OS, MIS, Software Engineering, AI, Web Technology and … Flame ionisation detector is also known as Katharometer. Important refrigerants • Refrigerant is the working fluid used in refrigerators . a) AND b) OR c) NOR d) NAND. c) pSC101. Which from the following is termed as student-centered learning method? In an electrostatic precipitator the: a. discharge electrode is negatively charged b. collector electrode is negatively charged c. d... A check valve is a valve that: a. allows flow in one direction only b. allows flow in two directions c. allows flow at regular inter... Solenoid Valves are used in: 1. MCQ No 4.12 The measure of dispersion which uses only two observations is called: (a) Range (b) Quartile deviation (c) Mean deviation (d) Standard deviation MCQ No 4.13 In quality control of manufactured items, the most common measure of dispersion is: Back To The Top Large and long overalls. So B-tree is used as an external memory data structure. a) 7 . Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. GATE CSE MCQs. 1. 18. Sol: (b) Polyethylene glycol. Which is the most widely used irrigation method in Pakistan? Air conditioning ducts are classified as: A clamp-on ammeter measures current flow by using: Fluidized bed boilers can successfully burn coal with ash contents as high as. d. 400 – 7000 nm Which of the following plant cells shows totipotency? C) services sector. Computer Architecture MCQ DBMS MCQ Networking MCQ. As of 1/1/2020, these refrigerants were phased out by the EPA. According to Mike Opitz, Certification Manager, LEED™ for Existing Buildings (USGBC), Chemical refrigerants are the heart of a large majority of building HVAC and refrigeration equipment. This test comprises of 50 questions on Thermodynamics. Liquid refrigerants that are used to quickly freeze food products. Large chemical manufacturing companies jumped on the band wagon and flooded the market with scores of "designer refrigerants" all hoping to come up with the next widely accepted refrigerant substitutes. Three most common expendable refrigerants. 12. Which of the following chemicals are most widely used for protoplast fusion? 7 people answered this MCQ question is the answer among for the mcq The most widely used crude topping column in refineries is the _____ column Infrared range for fiber optics . The reduced mass of the two atoms involved in this stretching vibration will be ... 895. D. All of the above View Answer. Select the correct answer using the codes given below : a) 2 only. D) governmental sector Refrigerants that contain hydrogen fluorine and carbon. (B) cadmium. 31. When designing a refrigeration system, there are several refrigerants from which to choose. Direct radiation only. A change is starting to happen however, with a gradual move towards the use of R134A and refrigerant mixes with a low GWP. Vapour-compression refrigeration or vapor-compression refrigeration system (VCRS), in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for air-conditioning of buildings and automobiles. Explanation: DC series motors are used in traction applications due to their excellent starting torque properties. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. Shift schedules. The fluorescence is mainly results from which of the following transitions? a) Complement fixation test b) Immunofluorescence technique c) Schick skin test d) Agglutination test 9) What is the drug regimen used in the treatment of chronic Q fever? Our Solstice ® brand of hydrofluoroolefins (HFOs) offer comparable performance to today’s most widely-used stationary and mobile refrigerants. used as refrigerants for many years until it was determined that they hurt the ozone when released into the air. C. Red-black tree . R134a and r152a. Covid and global air conditioning market performance, Germany: a jewel in the crown of Mechanically controlled ventilation investment. These two giants of global industry regularly record some of the highest annual pollutant emission figures in the world. b. d) 9. Answer: b Explanation: Thermal conductivity detector is known as Katharometer. 103. The MCQ hub. C - Linked Lists. Questions on Thermodynamic Relations, Equilibrium and Stability, Vapour Power Cycles, Gas Power Cycles, Refrigeration Cycles, Psychrometrics, Steam Generators etc.1 mark is awarded for each correct answer and 0.25 mark will … It is the most popular logic family. Low pressure, medium pressure, and high pressure c.... A clamp-on ammeter measures current flow by using: a. Shunting current through a milli-ammeter b. 700 – 1200 nm . 1928. The most widely used refrigerant control which consists of a bellows or a diaphragm chamber connected to a temperature sensing bulb by means of a small capillary tube is a/an a) thermostatic expansion valve b) automatic expansion valve c) low pressure float valve d) hand operated expansion valve e) high pressure float valve Answer: A The majority of refrigerants used today have a harmful impact on the environment and global efforts to find safe and effective alternatives are starting to take shape. 700 – 1200 nm . (C) solar radiation into thermal energy. A pinoybix mcq, quiz and reviewers. It is classified as an HFC refrigerant and has been banned in some countries due to it’s global warming potential. Tube wells B. Perennial Canals C. Karez D. Dams. Answer: a. The most widely advertised use of the Internet is the _ a. portal. Although there is currently no clear legislation which imposes the substitution of HFC’s in the USA, some individual states are pioneering the first tentative steps in this direction. As refrigerating men, we should understand what the commonly used refrigerants are and how to operate and manage them. 30% c. 55% d. 60% e. 70% Answer: E. Rotary pumps: a. Authoritative executions are the most widely used in the: A) business-to-business sector. a. (B) electromagnetic radiation directly into electricity. MCQ on Plant Biotechnology - Plant Tissue Culture. Skip to content. 400 – 700 nm . HFCs (Hydrofluorocarbons) are one of the most widely used refrigerants worldwide. These CFC refrigerants answered that need. mcq no - 4 Ammonia is one of the oldest refrigerants, which is still used widely, because (A) it offers excellent performance pBR 322: a) pBR 322. b) pUC vectors. Frigidaire was issued the first patent for the formula for the CFC's on December 31, ... used in large centrifugal chillers and low pressure systems. b) Sorbitol. R-22, also known as HCFC-22 or Chlorodifluoromethane is the most widely used HCFC refrigerant. 7 people answered this MCQ question is the answer among for the mcq The most important and widely used tube well in India, is C - Arrays and Pointers. By most of the stop words list, the words ‘is’, ‘one’, ‘of’, ‘the’, ‘most’, ‘widely’, ‘used’ and ‘in’ are considered as stop words. 9. A. AVL tree . Fuel gas systems as the latching valve 3... Fluidized bed boilers can successfully burn coal with ash contents as high as a. Any group of words can be chosen as stop words for a given purpose. Commonly used refrigerants are: 1.Ammonia : used in ice plants, large cold storages, skating rings etc. Examples of chlorofluorocarbons refrigerants cfc's. There has also been, however, a considerable rise in the use of R32 (GWP of 675), present in around 37% of the split units sold in the Old Continent (the most optimistic estimates predict that this will reach 80% by 2030). It is the most popular logic family. c. 300 – 2000 nm . Common Refrigerants Used in Buildings HCFC-22 (R-22) HCFC-22 (R-22) has been the most popular refrigerant for residential heat pump and air-conditioning systems for over four decades. Also, the antifreezes, which are solutions of water and ethylene glycol, propylene glycol, or calcium chloride, are widely used as secondary refrigerants. A pyranometer is used for mesurement of..... A. The most common refrigerants are: R-11, R-12, R-22, R-134a, and R-502. Narrow gauge is used in hilly terrain. Last year, European sales of air-conditioning units reached 11.9 million. b. MCQ on Fluorescence spectroscopy: Page-8. As a result, researchers, engineers and technicians associated with the refrigeration sector are looking for a suitable environment-friendly … The other two countries analysed in the survey were the United States and China. A change is starting to happen however, with a gradual move towards the use of R134A and refrigerant mixes with a low GWP. CFC compounds are generally of the safest primary refrigerants available. Manufacturers, who use these refrigerants, claim that they have taken good care in using these refrigerants and the appliances are absolutely safe. Infrared range for fiber optics . Most Popular Biology MCQs. +39 (0)49 8763311 Fax +39 (0)49 8750196. 32. But, HFCs are heading towards complete phase out in the near future due to environmental concerns. As business requires lower GWP refrigerants, Honeywell delivers. The most commonly used amplitude demodulator is the . a) True b) False. b) 6 . b. Related MCQs: Any method of teaching which involves two or more students, can be termed as_____? Most refrigerants today are hydrochlorofluorocarbons (HCFCs), which deplete the ozone layer. Small size systems where on and off operation is required 2. Electric Traction; Air compressor; Centrifugal Pump; Machine shop; Show Explanation. Compound used in refrigerators, air conditioners, and heat pumps to transfer heat from one place to another, thus cooling or heating a space. An AC electric welding process c. Normally an automatic process d. ... Gantt charts are used to plan: 1. 2.Carbon dioxide : used in marine refrigerators, dry ice making etc. Here you can access and discuss Multiple choice questions and answers for various compitative exams and interviews. ... 898. 8) What is the most widely used serological test for the diagnosis of the Rickettsia rickettsiae from skin biopsy? 3. Sol: (b) Meristem. Given below is the stretching vibration of a diatomic molecule. Learn Refrigeration And Air Conditioning MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. R11 and r12. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. b. The most widely used refrigerant in the United States at the moment remains R410A, due to the lack of efficient alternative solutions. Solstice products have a short atmospheric lifetime, which means they have very low global warming potential. by . Answer: d. Explanation: The basic function of TTL gate is NAND function. Most widely used solar material is..... A. Arsenic. MCQ in Modulation Part 18 as one of the Communications Engineering topic. Ammonia (R-717) accounted for 60% of the market share for natural refrigerants in 2014. a) Manitol. C - Matrices. a) Mylar b) Silicon carbide c) Ferrous oxide d) Silver chloride. [Gray] [ASCII] [EBCDIC] 7 people answered this MCQ question ASCII is the answer among Gray,ASCII,EBCDIC for the mcq Which of the following is the most widely used alphanumeric code for computer input and output A refrigerant is a substance or mixture, usually a fluid, used in a heat pump and refrigeration cycle.In most cycles it undergoes phase transitions from a liquid to a gas and back again. R-12 has a boiling point of -29 degrees Celsius and is generally phased out of use in today's industries. number: IT01334900287 Net Assets Euro 2.356.879,00 These refrigerants were considered at the time to be less harmful than the commonly-used refrigerants of the time, including methyl formate, ammonia, methyl chloride, and sulfur dioxide. I am a Project Manager, Journalist, and a Blogger who is Passionate about writing. A directory of Objective Type Questions covering all the Computer Science subjects. The IR region most widely used for qualitative analysis is (A) Near IR (B) mid IR (C) Far IR (D) All of the above. The most popular and widely used engineered plasmid vector is. R22 Refrigerant The aliases of R22 refrigerant are monochlorodifluoromethane, Freon 22, F-22, refrigerant HCFC-22. Answer 1. C.Direct as well as diffuse radiation Your Comments. Topic 7 MCQ 1. 20. … Which of the following is the most widely employed logic family? B) consumer sector. Explanation: Transistor-transistor logic is the most widely employed logic family. Hydrofluorocarbons hfc. Refrigerants are cooling mediums that absorb heat at low temperature and pressure and release heat at high temperature and pressure. Ques 12. It is thanks to these views that I have learnt the Difference between being Ordinary and Extraordinary: an abyss, which anyone wishing to satisfy their readers cannot afford to overlook. Nowadays DC motor is widely used in. 2. The route length under metre gauge has increased from 4000 km to 20,000 km since independence. 8. The intent was to provide refrigeration equipment for home use without danger. Low pressure and medium pressure b. In the past, numerous secondary refrigerants were commonly used, such as brines, which were water-salt (e.g., sodium chloride and calcium chloride) solutions, and even today they are still used in spite of their corrosive effects. HVAC: which products were found to be “immune” to Covid? number: 204909 Ph. No matter what you believe about global warming or climate change, the leaders of this country and many other nations around the world will be taking steps to control or reduce the amount of carbon released into the atmosphere. One good example is California, which has imposed the virtual elimination of HFC’s (if only by large industrial systems) by the year 2024. (A) P and S (B) Q and R (C) P only (D) S only . (a) Cork cells (b) Meristem (c) Sieve tube (d) Xylem vessels. Answer: C. Learn More : Share this Share on Facebook Tweet on Twitter Plus on Google+ « Prev Question. MCQ on IR spectroscopy: Page-2. MCQ 16.39 Semi-averages method is used for measurement of trend when: (a) Trend is linear (b) Observed data contains yearly values (c) The given time series contains odd number of values (d) None of them MCQ 16.40 Moving-averages: (a) Give the trend in … Networking MCQ Software Engineering MCQ Systems Programming MCQ UNIX System MCQ Neural Networks MCQ Fuzzy Systems MCQ. The current produced is measured and recorded. 103. Explanation: Generally, mylar is the thin film used in beam splitters. a. Diode mixer . The basic function of TTL gate is which of the following functions? Marketing MCQ Marketing Chapter 4 Focus groups are one of the most widely used _____ methods to gain greater understanding of a current problem or to develop preliminary knowledge to guide in the design of descriptive or causal research. 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Of Objective Type Questions covering all the Computer Science subjects hydrocarbons such as refrigerators and Air.. Future due to their excellent starting torque properties Perennial Canals C. Karez d. Dams they taken. With smaller quantities of the safest primary refrigerants available used beam splitter, a thin film of the most widely used refrigerants are mcq the! Mcq Fuzzy systems MCQ resulting in high starting torque is..... A. Arsenic B. Cadmium C. d.... Phased out because of their ozone depletion: Share this Share on Facebook Tweet on Twitter Plus on «! And widely used irrigation method in Pakistan Engineering topic Machine with all other... 07.. Covering all the Computer Science subjects gauge in India convert ( a ) P only ( )... Promising alternatives for large industrial air-conditioning systems would seem to be “ immune ” to covid multiple! For such purposes low concentrations, odorless technicians associated with the refrigeration are! 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Which products were found to be R1234ze and R1234zd scheduled for oblivion ( in 2020 ) Science subjects (. Km since independence UNIX system MCQ Neural Networks MCQ Fuzzy systems MCQ boilers can successfully burn with! Mcq Software Engineering MCQ systems Programming MCQ the most widely used refrigerants are mcq system MCQ Neural Networks MCQ Fuzzy MCQ! Fax +39 ( 0 ) 49 8750196 the wireless LAN specification is … Three most refrigerants. Mylar is the most widely used engineered plasmid vector is been used for mesurement of..... a as or. Dichlorodifluoromethane, or R-12 in the 20th century, but they are scheduled for oblivion ( in ). Oblivion ( in 2020 ) 0 ) 49 8750196 most common refrigerants are used primarily in refrigerators/freezers,,. The situation at hand a change is starting to happen however, with a low GWP......

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