d) All of the above. US2990775A US717194A US71719458A US2990775A US 2990775 A US2990775 A US 2990775A US 717194 A US717194 A US 717194A US 71719458 A US71719458 A US 71719458A US 2990775 A US2990775 A US 2990775A Authority US United States Prior art keywords current thermoelectric chamber junction circuit Prior art date 1958-02-24 Legal status (The legal status is an assumption and … Next . c) A low pressure is maintained so that the compressor can run. (a) the standard unit used in refrigeration problems (b) the cooling effect produced by melting 1 ton of ice (c) the refrigeration effect to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours (d) the refrigeration effect to produce 1 ton of ice at NTP conditions (e) the refrigeration effect to produce 1 ton of ice in 1 hour time. Thermoelectric Refrigeration Systems: Thermoelectric cooling uses the Peltier effect to create a heat flux between the junctions of two different types of materials. Solid-state thermoelectric devices can directly convert electricity into cooling or enable heat pumping through the Peltier effect. There are four well known cooling systems, Vapour Compression, absorption, thermoelectric and newly known Thermo-acoustic refrigeration system. I. Ans. The standard unit used in refrigeration problems. In these systems, the working fluid (refrigerant) provides refrigeration effect as it changes its state from liquid to vapor in the evaporator. The Peltier effect was discovered by Jean Charles Athanase Peltier in 1834 15 from the observation that current driven through a thermocouple between two conductors can transport, generate or remove heat from the junction. b) Refrigeration effect is produced as the refrigerant liquid vaporizes. This test is Rated positive by 88% students preparing for Mechanical Engineering.This MCQ test is related to Mechanical Engineering syllabus, prepared by Mechanical Engineering teachers. INTRODUCTION There are four well known cooling systems, Vapour Compression, absorption, thermoelectric and newly known Thermo-acoustic refrigeration system. The cooling effect produced by refrigeration system is based on simple principle of operation, that a heat flux is absorbed from a … Ans: c 73. MCQs of Introduction. practical refrigeration systems as it is easier to handle fluids in cyclic devices. This effect is commonly used in camping and portable coolers and for cooling electronic components and small instruments. B. Peltier stated that electric current flows through two dissimilar metals would produce heating and cooling at the junctions. The cooling effect produced by refrigeration system is based on simple One ton of the refrigeration is. D. The refrigeration effect to produce 1 ton of … 2 that shows this detail below. a) and b) Q. Jan 12,2021 - Test: RAC Practice (Level -I)- 1 | 25 Questions MCQ Test has questions of Mechanical Engineering preparation. C. The refrigeration effect to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours. Keywords-VCRS, thermoelectric refrigeration, peltier unit, COP, hybrid refrigeration system . Refrigeration and Air Conditioning (2161908) MCQ. A. When analyzing the articles on the Peltier effect and its use in refrigeration as a thermoelectric generator, we found about 2600, these were published before 1998 to the present, as we can see Fig. The function of a compressor in a vapour compression refrigeration system is to: a) To maintain the required low-side pressure in the evaporator thermoelectric cooling effect also known as P eltier effect. The year 2017 has a high publication trend, it is the year with the highest number of publications with 247 of these, The cooling effect produced by melting 1 ton of ice. 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