Multiple Choice Questions (MCQ) and Answers on Chemical Engineering Thermodynamics Question 1 : The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. Q. c) Q. In the evaporation system, steam is used as a heating medium as well as vapour produced from the previous effect is used as a heating medium in next effect. out cooling applications reducing the use of electrical energy. Since In simple, refrigeration means the cooling of or removal of heat from a system. In a vapour cycle the working fluid undergoes phase change and refrigeration effect is due to the vaporization of refrigerant liquid. MCQ No ... the cooling effect produced by melting of 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 … 14.1.4. C. Chimney draught. b) Thermal energy. B. Cooling An Amount Of Water At Low Pressure. The extinguishing effect of the foam is a combination of smothering and cooling. How dry chemical powder extinguishes fire ? Thermoelectric Refrigeration Systems: Thermoelectric cooling uses the Peltier effect to create a heat flux between the junctions of two different types of materials. The specific feature of the steam jet refrigeration (SJR) is the use of water as refrigerant. Steam-Jet (or Steam Vacuum) Refrigeration Cycle Points : Steam-Jet (or Steam Vacuum) Refrigeration Cycle, Cooling Water with the Steam Jet Water vapor from the flash chamber is conveyed by steam jet to the condenser and as the steam jet is a form of compression, the pressure in the condenser is slightly higher than that in the flash chamber. Q. In Cascade refrigeration, cooling effect is produced by (a) Latent heat (b) Total heat (c) Sensible heat (d) None (Ans:a) The ratio of COP of a two stage Cascade refrigeration system vs three stage cascade system is (a) < 1 (b) > 1 (a) = 1 (d) None (Ans: a) In a 2 stage cascade refrigeration system, cooling effect occurs in the (a) one evaporator How foam extinguishes fire ? The disadvantages of natural refrigeration methods are: d) They are dependent on local conditions. Q. 7 Steam Jet Refrigeration. The height of the cooling tower in thermal power plant is about 9 feet or above from the ground level. Top 250 I.C. STEAM JET COOLING SYSTEM Steam jet cooling system is a cooling technique which involves usage of steam and water for cooling purposes. B.Decreses Your Comments. The performance of the refrigeration system is expressed as C.O.P. On completion of this course, students should be able to 1. If the refrigerant is a pure substance then its temperature remains constant during the phase Q. Q. In the evaporator of a vapour compression refrigeration system: a) A low temperature is maintained so that heat can flow from the external fluid, b) Refrigeration effect is produced as the refrigerant liquid vaporizes, c) A low pressure is maintained so that the compressor can run. 5. Steam-Jet Chiller Integrated with SLIC System Incorporation of a steam-jet refrigeration system into a SLIC requires addition of an evaporator chamber, the steam-jet ejector, and a condenser for rejecting heat to ambient. Solar energy based refrigeration systems are developed to: Q. b) When two refrigerating cycles are used in series with two different refrigerants, the system is known as a. dual refrigeration system A.Induced steam jet draught Change ), You are commenting using your Facebook account. Ans: c 73. In simple, refrigeration means the cooling of or removal of heat from a system. 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