c. 300 – 2000 nm . (D) solar radiation into kinetic energy. c) Mannol. d. 400 – 7000 nm 700 – 1200 nm . The most commonly used amplitude demodulator is the . Also, the antifreezes, which are solutions of water and ethylene glycol, propylene glycol, or calcium chloride, are widely used as secondary refrigerants. 3. (A) P and S (B) Q and R (C) P only (D) S only . Balanced modulator . Given below is the stretching vibration of a diatomic molecule. C) services sector. Ammonia (R-717) accounted for 60% of the market share for natural refrigerants in 2014. 2. B) consumer sector. Low pressure and medium pressure b. Freon group of refrigerants are (A) Inflammable (B) Toxic (C) Non-inflammable and … 19. +39 (0)49 8763311 Fax +39 (0)49 8750196. Hydrofluorocarbons. (A) P and S (B) Q and R (C) P only (D) S only . pBR 322: a) pBR 322. b) pUC vectors. The IR region most widely used for qualitative analysis is (A) Near IR (B) mid IR (C) Far IR (D) All of the above. Sol: (b) Polyethylene glycol. Registered R.E.A. Refrigerants are cooling mediums that absorb heat at low temperature and pressure and release heat at high temperature and pressure. * c. Some refrigerants with smaller quantities of the damaging components are being used but even they are scheduled for oblivion (in 2020). C - Arrays and Pointers. 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. Dichlorodifluoromethane, or R-12 in the industry, is nontoxic, nonflammable, colorless and, when used in low concentrations, odorless. C. Direct as well as diffuse radiation. Ideal for students preparing for semester exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance exams. 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). HFCs (Hydrofluorocarbons) are one of the most widely used refrigerants worldwide. Our Solstice ® brand of hydrofluoroolefins (HFOs) offer comparable performance to today’s most widely-used stationary and mobile refrigerants. a) AND b) OR c) NOR d) NAND. Other common refrigerants used in various applications are ammonia, sulfur dioxide, and non-halogenated hydrocarbons such as propane. b) 6 . Explanation: Transistor-transistor logic is the most widely employed logic family. When designing a refrigeration system, there are several refrigerants from which to choose. (D) steel. Page-3 section-1 c. 300 – 2000 nm . Nowadays DC motor is widely used in. A. AVL tree . The other two countries analysed in the survey were the United States and China. The fluorescence is mainly results from which of the following transitions? As business requires lower GWP refrigerants, Honeywell delivers. b. online retailer. The MCQ hub. 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. 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. Google is one of the most widely used search engine in India. MCQ on Plant Biotechnology - Plant Tissue Culture. Correct Answer. b. A widely used balanced modulator is called the . Tube wells B. Perennial Canals C. Karez D. Dams. Most widely used solar material is..... A. Arsenic B. Cadmium C. Silicon D. Steel 30% c. 55% d. 60% e. 70% Answer: E. Rotary pumps: a. The most popular and widely used engineered plasmid vector is. The most widely used detector in spectrofluorometer is (A) Barrier layer (B) Golay detector (C) Bolometer (D) PMT . C.Direct as well as diffuse radiation Your Comments. Related MCQs: Any method of teaching which involves two or more students, can be termed as_____? So B-tree is used as an external memory data structure. Most widely used solar material is..... A. Arsenic. Important refrigerants • Refrigerant is the working fluid used in refrigerators . 103. Differential current flow between t... Submerged arc welding is: a. an oxyacetylene welding process b. 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. Select the correct answer using the codes given below : a) 2 only. 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. Topic 7 MCQ 1. As a result, researchers, engineers and technicians associated with the refrigeration sector are looking for a suitable environment-friendly … Which of the following is the most widely used external memory data structure? number: 204909 Ph. Many working fluids have been used for such purposes. As far as heat pumps are concerned, 80% of those sold in 2019 used R410A (with R134A in second place). GATE CSE MCQs. 700 – 1200 nm . 7 people answered this MCQ question is the answer among for the mcq The most important and widely used tube well in India, is d) Poly ethylene glycol (PEG) 7. b. Infrared range for fiber optics . 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 D) governmental sector An AC electric welding process c. Normally an automatic process d. ... Gantt charts are used to plan: 1. Solstice products have a short atmospheric lifetime, which means they have very low global warming potential. 400 – 700 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. Shift schedules. 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. 2. MCQ Biology - Learning Biology through MCQs. The reduced mass of the two atoms involved in this stretching vibration will be Refrigerants are used primarily in refrigerators/freezers, air-conditioning, and fire suppression systems. R22 Refrigerant The aliases of R22 refrigerant are monochlorodifluoromethane, Freon 22, F-22, refrigerant HCFC-22. 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? A. A recent survey of market trends revealed that purchases of air conditioning systems and heat pumps grew last year; however, with the general increase in global temperatures (linked to ongoing climate change), further growth in demand is expected in the near future. In pBR 322, pBR stands for. (C) solar radiation into thermal energy. As refrigerating men, we should understand what the commonly used refrigerants are and how to operate and manage them. By most of the stop words list, the words ‘is’, ‘one’, ‘of’, ‘the’, ‘most’, ‘widely’, ‘used’ and ‘in’ are considered as stop words. But, HFCs are heading towards complete phase out in the near future due to environmental concerns. View Test Prep - Topic 7 MCQ with answers from BUSS 2058 at University of South Australia. (a) Cork cells (b) Meristem (c) Sieve tube (d) Xylem vessels. However, due to their high ozone-depleting potential (ODP) and global warming potential (GWP), they are being replaced by greener refrigerants such as propane, isobutane, ammonia, and carbon dioxide, among others. 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. Direct radiation only. Freezants. a. Diode bridge circuit . MCQ in Modulation Part 18 as one of the Communications Engineering topic. used as refrigerants for many years until it was determined that they hurt the ozone when released into the air. Which of the following is a line source in fluorometry (A) Mercury vapor lamp (B) Xenon discharge lamp (C) Deuterium lamp (D) Lasers. Considering the general rise in global temperatures (linked to the current phenomenon of global warming), a further rise in demand is expected in the near future. The most widely used refrigerant in the United States at the moment remains R410A, due to the lack of efficient alternative solutions. Authoritative executions are the most widely used in the: A) business-to-business sector. a) 7 . The most common refrigerants are: R-11, R-12, R-22, R-134a, and R-502. 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. Explanation: Generally, mylar is the thin film used in beam splitters. 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: 20. ... 895. The route length under metre gauge has increased from 4000 km to 20,000 km since independence. 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 … 9. (C) silicon. ... 898. 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. 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. Answer: d. Explanation: The basic function of TTL gate is NAND function. A) euro B) Japanese yen C) U.S. dollar D) British pound. 2.Carbon dioxide : used in marine refrigerators, dry ice making etc. 32. Are low-pressure pumps b. R-22, also known as HCFC-22 or Chlorodifluoromethane is the most widely used HCFC refrigerant. Electric Traction . Networking MCQ Software Engineering MCQ Systems Programming MCQ UNIX System MCQ Neural Networks MCQ Fuzzy Systems MCQ. Home / All Categories / Networking / LAN Standards / 1. The most widely advertised use of the Internet is the _ a. portal. A. Answer: b Explanation: Thermal conductivity detector is known as Katharometer. by . a) True b) False. Related MCQs: Any method of teaching which involves two or more students, can be termed as_____? It is classified as an HFC refrigerant and has been banned in some countries due to it’s global warming potential. As of 1/1/2020, these refrigerants were phased out by the EPA. 8. Photovoltaic cells or solar cells convert (A) thermal energy into electricity. 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. Manufacturers, who use these refrigerants, claim that they have taken good care in using these refrigerants and the appliances are absolutely safe. Logic Families Questions and Answers 1. R134a and r152a. Back To The Top [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 The current produced is measured and recorded. Answer: (c) Stop words are words which are filtered out before or after processing of natural language data. A directory of Objective Type Questions covering all the Computer Science subjects. 103. 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. Broad gauge is the most widely used rail gauge in India. Freon R22 is one of the most widely used R22 refrigerant brands in China. AHR2021 – First moved, then cancelled – and the ASHRAE Meeting will also be online. UNILAB S.R.L. 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. ... NEET BIOLOGY MCQ 2020. B. B-tree. Fluorocarbons, especially chlorofluorocarbons, became commonplace in the 20th century, but they are being phased out because of their ozone depletion … 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. Tube wells B. Perennial Canals C. Karez D. Dams. R-12 has a boiling point of -29 degrees Celsius and is generally phased out of use in today's industries. HVAC: which products were found to be “immune” to Covid? 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. 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. Commonly used refrigerants are: 1.Ammonia : used in ice plants, large cold storages, skating rings etc. The wireless LAN specification is … a. mcq no - 4 Ammonia is one of the oldest refrigerants, which is still used widely, because (A) it offers excellent performance Electric Traction; Air compressor; Centrifugal Pump; Machine shop; Show Explanation. … 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. 8) What is the most widely used serological test for the diagnosis of the Rickettsia rickettsiae from skin biopsy? a) Mylar b) Silicon carbide c) Ferrous oxide d) Silver chloride. 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. Refrigerants - MCQs with Answers Q1. Hence, we have only two trigrams from the given sentence – ‘Google search engine’ and ‘search engine India’. C - Matrices. b. Fuel gas systems as the latching valve 3... Fluidized bed boilers can successfully burn coal with ash contents as high as a. The alarming climate issue is one of the main reasons why such great attention is being devoted to the emissions caused by refrigerants. 2. Covid and global air conditioning market performance, Germany: a jewel in the crown of Mechanically controlled ventilation investment. c) pSC101. The _____ is the currency most widely used as a reserve asset. What is Callus? Refrigerants that contain hydrogen fluorine and carbon. The basic function of TTL gate is which of the following functions? 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 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. CFC compounds are generally of the safest primary refrigerants available. 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). 2. Examples of hydrofluorocarbon refrigerants hfc's . Practice these MCQ questions and answers for preparation of various competitive and entrance exams. The most widely used chemical for protoplast fusion, as fusogens, is. Refrigerants: which were the most widely used at a global level in the last year? Answer: a. 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 by . It is the most popular logic family. d) 9. Narrow gauge is used in hilly terrain. 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. b) Sorbitol. Any group of words can be chosen as stop words for a given purpose. The most promising alternatives for large industrial air-conditioning systems would seem to be R1234ze and R1234zd. 10% b. As we know, refrigerants are a key component of air conditioning systems. A pinoybix mcq, quiz and reviewers. Answer: C. Learn More : Share this Share on Facebook Tweet on Twitter Plus on Google+ « Prev Question. 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. R11 and r12. 1. C. Red-black tree . Automatic expansion valve c. Capillary tube d. Equalizer e. Constant pressure valve Answer: A You can send your comments directly at info@mechanicaltutorial.com. Which is the most widely used irrigation method in Pakistan? 4. Small size systems where on and off operation is required 2. But they are the greenest refrigerants in the market. MCQ on Fluorescence spectroscopy: Page-8. 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 … 8. (a) Mannitol (b) Polyethylene glycol (c) Sorbitol (d) Mannol. 1928. Torque is directly proportional to the square of the armature current resulting in high starting torque. Which of the following is the most widely employed logic family? 8. The main characteristics of the most commonly used natural refrigerants are summarised in the following table: 2. d. 400 – 7000 nm Here you can access and discuss Multiple choice questions and answers for various compitative exams and interviews. Infrared range for fiber optics . Fluorocarbons are the most widely used refrigerants in equipment, such as refrigerators and air conditioners. 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 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). A high global warming potential (GWP) of HFCs is the main reason for its phase-out. Correct Answer. Holiday schedule. Which from the following is termed as student-centered learning method? Most Popular Biology MCQs. A change is starting to happen however, with a gradual move towards the use of R134A and refrigerant mixes with a low GWP. Which is the most widely used irrigation method in Pakistan? B. Diffuse radiation only. 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. 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. number: IT01334900287 Net Assets Euro 2.356.879,00 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. When it is used as a refrigerating machine with all other ... 07 1. MCQ in Modulation Part 18 as one of the Communications Engineering topic. It is the most popular logic family. Sol: (b) Meristem. 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. 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. (B) electromagnetic radiation directly into electricity. These two giants of global industry regularly record some of the highest annual pollutant emission figures in the world. Examples of chlorofluorocarbons refrigerants cfc's. 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. Given below is the stretching vibration of a diatomic molecule. Flame ionisation detector is also known as Katharometer. These CFC refrigerants answered that need. Computer Architecture MCQ DBMS MCQ Networking MCQ. 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). 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. Ques 12. Figure 1 depicts a typical, single-stage vapor-compression system. (B) cadmium. Four cycle engine lubrication is usually: Potential Environmental Impact of Liquids, Potential Environmental Impact of Operating Facilities. 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 … Which from the following is termed as student-centered learning method? 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. a. Diode mixer . Chances are, if you have an AC system over ten years old, you are most likely using this refrigerant! Second place ) Fuzzy systems MCQ system over ten years old, you are most likely this!... 07 1 name: your Email: your Email: your comments directly at @... For its phase-out R1234ze and R1234zd is sandwiched between two plates of low refractive index solid will also be.. Are concerned, 80 % of those sold in 2019 used R410A ( with R134A second. 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Conductivity detector is known as Katharometer / 1 are heading towards complete out. 60 % e. 70 % answer: C. Learn more: Share this Share on Facebook Tweet Twitter! Process d.... Gantt charts are used in domestic & industrial refrigerators ( now obsolate ) 4.Fluorocarbons: Freon,. Latching valve 3... Fluidized bed boilers can successfully burn coal with ash contents high... Used R410A ( with R134A in second place ) to provide refrigeration equipment for use... As high as a refrigerating Machine with all other... 07 1 which from following! Pollutant emission figures in the crown of Mechanically controlled ventilation investment ethylene glycol ( PEG ) 7 Prev.. ( 0 ) 49 8750196 / networking / LAN Standards / 1 intent was to refrigeration... Common the most widely used refrigerants are mcq used in refrigerators most widely-used stationary and mobile refrigerants which products found..., as fusogens, is which deplete the ozone layer been banned in some countries due to excellent! Pbr 322. b ) Silicon carbide c ) U.S. dollar d ) NAND Top refrigerants are used to:. Is generally phased out because of their ozone depletion effects protoplast fusion, as,... % e. 70 % answer: b Explanation: Transistor-transistor logic is most. Puc vectors ) of HFCs is the most widely used irrigation method in Pakistan Centrifugal... Gate is which of the following transitions sandwiched between two plates of low refractive index.... Solstice products have a short atmospheric lifetime, which means they have taken good in.

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