Registered office: Via Nino Bixio, 6 – 35131, Padova ITALY V.A.T. The most widely used refrigerant in the United States at the moment remains R410A, due to the lack of efficient alternative solutions. MCQ on IR spectroscopy: Page-2. It is the most popular logic family. Answer 1. R-22, also known as HCFC-22 or Chlorodifluoromethane is the most widely used HCFC refrigerant. MCQ on Fluorescence spectroscopy: Page-8. Google is one of the most widely used search engine in India. CFC compounds are generally of the safest primary refrigerants available. [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 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. Most Popular Biology MCQs. a. C - Arrays and Pointers. Explanation: DC series motors are used in traction applications due to their excellent starting torque properties. Most widely used solar material is..... A. Arsenic. Infrared range for fiber optics . The basic function of TTL gate is which of the following functions? Refrigerants are used primarily in refrigerators/freezers, air-conditioning, and fire suppression systems. 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). 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. a) Manitol. Which of the following plant cells shows totipotency? It is the most popular logic family. Tube wells B. Perennial Canals C. Karez D. Dams. Manufacturers, who use these refrigerants, claim that they have taken good care in using these refrigerants and the appliances are absolutely safe. b. online retailer. Skip to content. ... 898. 700 – 1200 nm . The _____ is the currency most widely used as a reserve asset. An AC electric welding process c. Normally an automatic process d. ... Gantt charts are used to plan: 1. MCQ on Fluorescence spectroscopy: Page-8. 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. +39 (0)49 8763311 Fax +39 (0)49 8750196. MCQ on Plant Biotechnology - Plant Tissue Culture. 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: The most widely advertised use of the Internet is the _ a. portal. 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. R12: CCl2F2 dichlorofluoromethane, used for refrigeration systems at … R134a and r152a. a) True b) False. Given the variable degree of environmental impact, it is important to monitor their use. 7. Last year, European sales of air-conditioning units reached 11.9 million. What is Callus? 4. 103. Fuel gas systems as the latching valve 3... Fluidized bed boilers can successfully burn coal with ash contents as high as a. Your name: Your Email: Your Comments: You can send your comments directly at info@mechanicaltutorial.com. The intent was to provide refrigeration equipment for home use without danger. Answer: d. Explanation: The basic function of TTL gate is NAND function. 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. Figure 1 depicts a typical, single-stage vapor-compression system. The most widely used detector in spectrofluorometer is (A) Barrier layer (B) Golay detector (C) Bolometer (D) PMT . Refrigerants - MCQs with Answers Q1. Hydrofluorocarbons hfc. Fluorocarbons are the most widely used refrigerants in equipment, such as refrigerators and air conditioners. Ammonia (R-717) accounted for 60% of the market share for natural refrigerants in 2014. b) Sorbitol. Commonly used refrigerants are: 1.Ammonia : used in ice plants, large cold storages, skating rings etc. Freon group of refrigerants are (A) Inflammable (B) Toxic (C) Non-inflammable and … Logic Families Questions and Answers 1. 3.Methyl chloride: used in domestic & industrial refrigerators (now obsolate) 4.Fluorocarbons : Freon -11,12,13,22,113,114, etc. Which of the following is the most widely employed logic family? The cooperative learning method which combines whole class learning plus heterogeneous small groups … Refrigerants are cooling mediums that absorb heat at low temperature and pressure and release heat at high temperature and pressure. D. All of the above View Answer. The fluorescence is mainly results from which of the following transitions? 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. A. b. 8. The most widely used chemical for protoplast fusion, as fusogens, is. Hydrofluorocarbons. MCQ Biology - Learning Biology through MCQs. UNILAB S.R.L. 32. Examples of hydrofluorocarbon refrigerants hfc's . (A) P and S (B) Q and R (C) P only (D) S only . One good example is California, which has imposed the virtual elimination of HFC’s (if only by large industrial systems) by the year 2024. Direct radiation only. (C) silicon. (B) cadmium. You can send your comments directly at info@mechanicaltutorial.com. MCQ in Modulation Part 18 as one of the Communications Engineering topic. 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. When it is used as a refrigerating machine with all other ... 07 1. Unfortunately, if it leaks it contributes to ozone depletion. The most common refrigerants are: R-11, R-12, R-22, R-134a, and R-502. Balanced modulator . Fluorocarbons, especially chlorofluorocarbons, became commonplace in the 20th century, but they are being phased out because of their ozone depletion … The most widely used solar material is (A) arsenic. Home / All Categories / Networking / LAN Standards / 1. The MCQ hub. Topic 7 MCQ 1. Torque is directly proportional to the square of the armature current resulting in high starting torque. Next Question » If the answers is incorrect or not given, you can answer the above question in the comment box. 30% c. 55% d. 60% e. 70% Answer: E. Rotary pumps: a. Small size systems where on and off operation is required 2. R-12 has a boiling point of -29 degrees Celsius and is generally phased out of use in today's industries. mcq no - 4 Ammonia is one of the oldest refrigerants, which is still used widely, because (A) it offers excellent performance C) services sector. B) consumer sector. AHR2021 – First moved, then cancelled – and the ASHRAE Meeting will also be online. d) pUC 19. C. Direct as well as diffuse radiation. 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. b. C - Stacks and Queues. 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. Authoritative executions are the most widely used in the: A) business-to-business sector. By most of the stop words list, the words ‘is’, ‘one’, ‘of’, ‘the’, ‘most’, ‘widely’, ‘used’ and ‘in’ are considered as stop words. d. 400 – 7000 nm Answer: c Explanation: Photo ionization detector uses ultraviolet radiation from lamps to produce ionisation of solute molecules. pBR 322: a) pBR 322. b) pUC vectors. The other two countries analysed in the survey were the United States and China. … Also, the antifreezes, which are solutions of water and ethylene glycol, propylene glycol, or calcium chloride, are widely used as secondary refrigerants. Liquid refrigerants that are used to quickly freeze food products. 1. 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. Which refrigerants have zero odp. Freezants. Hence, we have only two trigrams from the given sentence – ‘Google search engine’ and ‘search engine India’. As far as heat pumps are concerned, 80% of those sold in 2019 used R410A (with R134A in second place). Other common refrigerants used in various applications are ammonia, sulfur dioxide, and non-halogenated hydrocarbons such as propane. It is the most popular logic family. The reduced mass of the two atoms involved in this stretching vibration will be Some refrigerants with smaller quantities of the damaging components are being used but even they are scheduled for oblivion (in 2020). This test comprises of 50 questions on Thermodynamics. Which is the most widely used irrigation method in Pakistan? Here you can access and discuss Multiple choice questions and answers for various compitative exams and interviews. 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). Registered R.E.A. Broad gauge is the most widely used rail gauge in India. 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. A. 8) What is the most widely used serological test for the diagnosis of the Rickettsia rickettsiae from skin biopsy? These CFC refrigerants answered that need. Fluidized bed boilers can successfully burn coal with ash contents as high as a reserve asset length... Second place ): Share this Share on Facebook Tweet on Twitter Plus on Google+ « Prev question chloride used! Leaks it contributes to ozone depletion effects widely used irrigation method in Pakistan Bioinformatics- Biological databases ; on... Filtered out before or after processing of natural language data answer: C. Learn:. Or solar cells convert ( a ) P only ( d ) Silver chloride given you. 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