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. C - Linked Lists. 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. Which of the following plant cells shows totipotency? 400 – 700 nm . 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 Shift schedules. used as refrigerants for many years until it was determined that they hurt the ozone when released into the air. A. AVL tree . An AC electric welding process c. Normally an automatic process d. ... Gantt charts are used to plan: 1. Page-3 section-1 Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. In the most widely used beam splitter, a thin film of _____ is sandwiched between two plates of low refractive index solid. Chances are, if you have an AC system over ten years old, you are most likely using this refrigerant! 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). b) 6 . Related MCQs: Any method of teaching which involves two or more students, can be termed as_____? Fluorocarbons, especially chlorofluorocarbons, became commonplace in the 20th century, but they are being phased out because of their ozone depletion … Refrigerants are cooling mediums that absorb heat at low temperature and pressure and release heat at high temperature and pressure. The most widely used refrigerant in the United States at the moment remains R410A, due to the lack of efficient alternative solutions. 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. 8. The basic function of TTL gate is which of the following functions? R22 Refrigerant The aliases of R22 refrigerant are monochlorodifluoromethane, Freon 22, F-22, refrigerant HCFC-22. 2. Electric Traction; Air compressor; Centrifugal Pump; Machine shop; Show Explanation. 1. c. 300 – 2000 nm . Narrow gauge is used in hilly terrain. A high global warming potential (GWP) of HFCs is the main reason for its phase-out. These CFC refrigerants answered that need. Are low-pressure pumps b. C.Direct as well as diffuse radiation Your Comments. The wireless LAN specification is … ... NEET BIOLOGY MCQ 2020. As far as heat pumps are concerned, 80% of those sold in 2019 used R410A (with R134A in second place). 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. 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. 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. Which of the following is a line source in fluorometry (A) Mercury vapor lamp (B) Xenon discharge lamp (C) Deuterium lamp (D) Lasers. B. Diffuse radiation only. B. B-tree. The route length under metre gauge has increased from 4000 km to 20,000 km since independence. (B) cadmium. A pyranometer is used for mesurement of..... A. 4. 19. Answer: c Explanation: Photo ionization detector uses ultraviolet radiation from lamps to produce ionisation of solute molecules. MCQ on Plant Biotechnology - Plant Tissue Culture. Which from the following is termed as student-centered learning method? (A) P and S (B) Q and R (C) P only (D) S only . 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

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