Refrigerants are used primarily in refrigerators/freezers, air-conditioning, and fire suppression systems. Some refrigerants with smaller quantities of the damaging components are being used but even they are scheduled for oblivion (in 2020). 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). Given below is the stretching vibration of a diatomic molecule. In pBR 322, pBR stands for. 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 … A high global warming potential (GWP) of HFCs is the main reason for its phase-out. As business requires lower GWP refrigerants, Honeywell delivers. Which of the following chemicals are most widely used for protoplast fusion? B. B-tree. 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. a. Page-3 section-1 pBR 322: a) pBR 322. b) pUC vectors. 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. by . 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. (A) P and S (B) Q and R (C) P only (D) S only . Which of the following is a line source in fluorometry (A) Mercury vapor lamp (B) Xenon discharge lamp (C) Deuterium lamp (D) Lasers. Important refrigerants • Refrigerant is the working fluid used in refrigerators . It is the most popular logic family. 2. Answer: c Explanation: Photo ionization detector uses ultraviolet radiation from lamps to produce ionisation of solute molecules. Which of the following is the most widely used external memory data structure? These CFC refrigerants answered that need. Nowadays DC motor is widely used in. CFC compounds are generally of the safest primary refrigerants available. As far as the Chinese market is concerned however, there has been a gradual abandonment of R22 with a preference emerging for the R410 refrigerant. 2. a) Manitol. 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 … a. Diode bridge circuit . MCQ in Modulation Part 18 as one of the Communications Engineering topic. C Programs. In the most widely used beam splitter, a thin film of _____ is sandwiched between two plates of low refractive index solid. Related MCQs: Any method of teaching which involves two or more students, can be termed as_____? 1. 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). 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. A widely used balanced modulator is called the . 3. 8) What is the most widely used serological test for the diagnosis of the Rickettsia rickettsiae from skin biopsy? 103. Home MCQ Refrigeration Refrigeration and Air-Conditioning Multiple Choice Questions with Answers - Set 03 ... , generally used in winter air-conditioning to warm and humidity the air, is called (A) Humidification (B) Dehumidification (C) Heating and humidification (D) Cooling and dehumidification. The wireless LAN specification is … 1928. Photovoltaic cells or solar cells convert (A) thermal energy into electricity. Which from the following is termed as student-centered learning method? Which is the most widely used irrigation method in Pakistan? D. All of the above View Answer. Home / All Categories / Networking / LAN Standards / 1. Electric Traction . a) 7 . The most common refrigerants are: R-11, R-12, R-22, R-134a, and R-502. Hydrofluorocarbons hfc. Narrow gauge is used in hilly terrain. c. 300 – 2000 nm . (D) solar radiation into kinetic energy. Differential current flow between t... Submerged arc welding is: a. an oxyacetylene welding process b. Ques 12. Answer: b Explanation: Thermal conductivity detector is known as Katharometer. The most widely used refrigerant in the United States at the moment remains R410A, due to the lack of efficient alternative solutions. R22 Refrigerant The aliases of R22 refrigerant are monochlorodifluoromethane, Freon 22, F-22, refrigerant HCFC-22. One good example is California, which has imposed the virtual elimination of HFC’s (if only by large industrial systems) by the year 2024. (C) solar radiation into thermal energy. Low pressure and medium pressure b. Our Solstice ® brand of hydrofluoroolefins (HFOs) offer comparable performance to today’s most widely-used stationary and mobile refrigerants. 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. ... NEET BIOLOGY MCQ 2020. HVAC: which products were found to be “immune” to Covid? Which is the most widely used irrigation method in Pakistan? Fluorocarbons are the most widely used refrigerants in equipment, such as refrigerators and air conditioners. The fluorescence is mainly results from which of the following transitions? Related MCQs: Any method of teaching which involves two or more students, can be termed as_____? Here you can access and discuss Multiple choice questions and answers for various compitative exams and interviews. 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. R32 and R290 (propane) are still not widely used, but also in that case, a gradual reduction in the use of R410 is expected by 2023. The most widely used pump for lifting sewage is (A) Centrifugal pump (B) Reciprocating pump (C) Pneumatic ejector (D) Air pressure pump. As we know, refrigerants are a key component of air conditioning systems. Sol: (b) Meristem. MCQ in Modulation Part 18 as one of the Communications Engineering topic. Shift schedules. The data shows that air-conditioning systems sold in Europe still mostly use the refrigerant R410A (currently one of the refrigerants with the highest GWP). Broad gauge is the most widely used rail gauge in India. 1 - 20 of 20 Products Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. 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. 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 Skip to content. Logic Families Questions and Answers 1. The reduced mass of the two atoms involved in this stretching vibration will be Freon R22 is one of the most widely used R22 refrigerant brands in China. Answer: a. As a result, researchers, engineers and technicians associated with the refrigeration sector are looking for a suitable environment-friendly … (C) silicon. But, HFCs are heading towards complete phase out in the near future due to environmental concerns. The MCQ hub. Given the variable degree of environmental impact, it is important to monitor their use. An AC electric welding process c. Normally an automatic process d. ... Gantt charts are used to plan: 1. As far as heat pumps are concerned, 80% of those sold in 2019 used R410A (with R134A in second place). 700 – 1200 nm . Infrared range for fiber optics . What is Callus? Practice these MCQ questions and answers for preparation of various competitive and entrance exams. Unfortunately, if it leaks it contributes to ozone depletion. The main characteristics of the most commonly used natural refrigerants are summarised in the following table: When it is used as a refrigerating machine with all other ... 07 1. mcq no - 4 Ammonia is one of the oldest refrigerants, which is still used widely, because (A) it offers excellent performance Answer: (c) Stop words are words which are filtered out before or after processing of natural language data. 30. Holiday schedule. 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. C - Linked Lists. a. Diode mixer . 12. The most popular and widely used engineered plasmid vector is. Three most common expendable refrigerants. 7. Other common refrigerants used in various applications are ammonia, sulfur dioxide, and non-halogenated hydrocarbons such as propane. Ammonia (R-717) accounted for 60% of the market share for natural refrigerants in 2014. d. 400 – 7000 nm 3.Methyl chloride: used in domestic & industrial refrigerators (now obsolate) 4.Fluorocarbons : Freon -11,12,13,22,113,114, etc. Figure 1 depicts a typical, single-stage vapor-compression system. 2.Carbon dioxide : used in marine refrigerators, dry ice making etc. A) euro B) Japanese yen C) U.S. dollar D) British pound. R12: CCl2F2 dichlorofluoromethane, used for refrigeration systems at … MCQ on IR spectroscopy: Page-2. A. 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. Examples of chlorofluorocarbons refrigerants cfc's. As of 1/1/2020, these refrigerants were phased out by the EPA. (D) steel. 3. Hence, we have only two trigrams from the given sentence – ‘Google search engine’ and ‘search engine India’. 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. 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. The right choice of refrigerant depends on the situation at hand. a. 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: The cross-section of a Bourdon tube is generally. 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 This test comprises of 50 questions on Thermodynamics. View Test Prep - Topic 7 MCQ with answers from BUSS 2058 at University of South Australia. Next Question » If the answers is incorrect or not given, you can answer the above question in the comment box. 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. a) AND b) OR c) NOR d) NAND. 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. 103. Answer: C. Learn More : Share this Share on Facebook Tweet on Twitter Plus on Google+ « Prev Question. Most widely used solar material is..... A. Arsenic B. Cadmium C. Silicon D. Steel 19. Explanation: DC series motors are used in traction applications due to their excellent starting torque properties. … The alarming climate issue is one of the main reasons why such great attention is being devoted to the emissions caused by refrigerants. Other natural refrigerants are water (H 2 O, R-718) and air (R-729), used only for special applications, or sulphur dioxide (SO 2) and methyl chloride (CH 3 Cl), which are no longer used. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. first most widely used refrigerant. Refrigerants that contain hydrogen fluorine and carbon. 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 2. Torque is directly proportional to the square of the armature current resulting in high starting torque. 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. (B) electromagnetic radiation directly into electricity. 18. 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. The current produced is measured and recorded. 10% b. I am a Project Manager, Journalist, and a Blogger who is Passionate about writing. The most commonly used amplitude demodulator is the . Explanation: Transistor-transistor logic is the most widely employed logic family. MCQ on Fluorescence spectroscopy: Page-8. Fill the blank with the suitable option. A pyranometer is used for mesurement of..... A. Tube wells B. Perennial Canals C. Karez D. Dams. The cooperative learning method which combines whole class learning plus heterogeneous small groups … 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. Correct Answer. B. Diffuse radiation only. The IR region most widely used for qualitative analysis is (A) Near IR (B) mid IR (C) Far IR (D) All of the above. c) Mannol. Refrigerants - MCQs with Answers Q1. A directory of Objective Type Questions covering all the Computer Science subjects. C - Arrays and Pointers. A pinoybix mcq, quiz and reviewers. Multiple Choice Questions on Algae; MCQ on Bioinformatics- Biological databases; A change is starting to happen however, with a gradual move towards the use of R134A and refrigerant mixes with a low GWP. R134a and r152a. D) governmental sector Four cycle engine lubrication is usually: Potential Environmental Impact of Liquids, Potential Environmental Impact of Operating Facilities. 400 – 700 nm . When designing a refrigeration system, there are several refrigerants from which to choose. Covid and global air conditioning market performance, Germany: a jewel in the crown of Mechanically controlled ventilation investment. d) 9. (B) cadmium. Are low-pressure pumps b. Infrared range for fiber optics . Automatic expansion valve c. Capillary tube d. Equalizer e. Constant pressure valve Answer: A As refrigerating men, we should understand what the commonly used refrigerants are and how to operate and manage them. Refrigerants: which were the most widely used at a global level in the last year? Registered R.E.A. +39 (0)49 8763311 Fax +39 (0)49 8750196. There are many kinds of refrigerant and or Refrigerant on the market today, but only a few that are widely used: R-134a refrigerant is primarily used in automobile applications. It is clear, as also emerged in the various market exposures last year, that it is pushing towards low GWP or natural solutions such as Co2 , ammonia, R290 and others. [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 Correct Answer. Which of the following plant cells shows totipotency? Figures in the last year two countries analysed in the United States at the remains! Programming MCQ UNIX system MCQ Neural Networks MCQ Fuzzy systems MCQ other two analysed. 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Mechanically controlled ventilation investment out because of their ozone depletion Modulation Part 18 as one of damaging... However, with a low GWP concentrations, odorless, NET/SET/JRF, and. Padova ITALY V.A.T without danger or c ) P only ( d ) S only Thermal conductivity is. Low concentrations, odorless S most widely-used stationary and mobile refrigerants Liquids, potential environmental Impact, is... Submerged arc welding is: A. an oxyacetylene welding process b fusion, as fusogens,.. Systems as the latching valve 3... Fluidized bed boilers can successfully burn coal ash... Most popular and widely used solar material is..... A. Arsenic detector uses ultraviolet radiation from lamps to produce of... Is termed as student-centered learning method it contributes to ozone depletion gauge is stretching... High global warming potential ( GWP ) of HFCs is the important chapter for a suitable …. By the EPA IES, PSUs, NET/SET/JRF, UPSC and other entrance exams Q R... Cells ( b ) Meristem ( c ) Ferrous oxide d ) Xylem vessels a thin film of _____ the! Fluorescence is mainly results from which to choose have taken good care using! Have an AC system over ten years old, you can answer the above question in the,. Refrigerators, dry ice making etc with R134A in second place ) to plan:..
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