Refrigeration as it is known these days is produced by artificial means. which is the ratio of refrigerating effect produced to the work of compression. c) Low electrical and thermal conductivity vapour dome. From the thermodynamic standpoint, water is a very good refrigerant since it has a high latent heat of evaporation and it is cheap, nontoxic, nonflammable, and available in unlimited quantities. b) Maintain high and low side pressures, c) Protect evaporator ( Log Out /  (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. Ans: c. 2. 38. A portion of the SLIC steam supply is directed to the steam-jet ejector where it creates a suction effect pulling the While the vapour from the final effect enters in the vapour condenser where cooling water is circulated to … In Steam Jet Refrigeration, Cooling Effect Is Produced By A. Cooling An Amount Of Water At High Pressure. B.Decreses Your Comments. Correct Answer 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. The function of an expansion valve is to: a) Reduce the refrigerant pressure Thermoelectric Refrigeration: An Introduction Thermoelectric cooling uses the Peltier effect to create a heat flux between the junctions of two different types of materials. Steam generation is useful for smothering. This effect is commonly used in camping and portable coolers and for cooling electronic components and small instruments. 1. Also, higher steam pressure will be possible than with saturated steam, enabling the steam to carry more energy. which is the ratio of refrigerating effect produced to the work of compression. Since the refrigeration effect is produced during phase change, large amount of heat (latent heat) ... vapour jet systems etc. In the past, a small-scale steam jet was studied experimentally. Q. The effect of friction in the nozzle _____ dryness fraction of steam. In refrigeration and cooling units, the exiting steam, or “motive” steam, is ejected from the vacuum chamber at a much lower temperature and pressure directly onto the functioning elements of the refrigeration system. Here a jet of air is used to cool the water when passed through the reducing section with the help of fan. A thermoelectric refrigeration systems requires: a) A high voltage AC (alternating current) input, c) A high voltage DC (direct current) input, These are the sample questions of the Refrigeration and Air conditioning (from study materials from IIT , Kharakpur). In steam ejector uses energy from fast-moving jet of steam to capture the capacity of the flash steam and squeeze it. Since Conclusions The prototype steam jet refrigeration cycle driven by low-grade thermal energy is developed for testing at actual ambient condition in Thailand where the cooling water produced by cooling tower is between 29 and 33°C. Steam and vapor jet refrigeration systems (Section 1.3.5) f. Thermoelectric refrigeration systems (Section 1.3.6), and g. Vortex tubes (Section 1.3.7) At the end of the lesson the student should be able to: ... refrigeration system where cooling is produced by this method is called evaporator. When two refrigerating cycles are used in series with two different refrigerants, the system is known as a. dual refrigeration system 5. 3, Fig. Foam is used against fire in oil surfaces. It is a fluid-dynamic pump with no moving parts, excepting a valve to control inlet flow. ( Log Out /  d) Both mechanical and thermal energy. Air cycle refrigeration systems are most commonly used in: Q. In a triple fluid vapour absorption refrigeration system, the hydrogen gas is used to: b) Reduce the partial pressure of refrigerant in evaporator. Change ), You are commenting using your Facebook account. Q. A steam jet refrigeration system can operate steadily at boiler temperature of 90 °C. Since MCQs of Refrigeration & Air Conditioning. ... refrigerating effect produced by the melting of 1 tonne of ice from and at 0°C in 24 hours. 2. If this can be achieved, conventional solar flat plate or evacuated tube water heaters can be used to power a steam jet ejector to produce refrigeration or cooling. Effects of the operating temperatures and effect of the primary nozzle position [2,3] were carried out. MCQ in Machine Design Part 7 as part of the coverage of Mechanical Engineering Board Exam ... Arc produced by two tungsten electrodes into which a jet of hydrogen is directed. © Copyright 2016. Forced steam jet draught. Introduction. Question: Q5: Choose The Right Answer (a, B, C, Or D) For Each Item. If the refrigerant is a pure substance then its temperature remains constant during the phase The draught produced by a steam jet issuing from a nozzle placed in the chimney,is called..... A. c) High pressure, motive steam. Understand the basic principles of refrigeration and air conditioning, 2. Ans: d. 40. Q. Performance of the steam jet refrigeration is strongly depen-dent on the equipped ejector. StudySite.org, Best online Subjective, Objective questions, MCQ's solution, best for any competitive examination provide best online coaching Steam jet refrigeration system. 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 … Steam- Jet Refrigeration System. Change ). Undercooling of the liquid is generally along the constant pressure line. Engine Multiple Choice Questions and Answers . The performance of the refrigeration system is expressed as C.O.P. Cooling water is required for following equipment in ammonia absorption plant (a) condenser (b) evaporator (c) absorber (d) condenser and absorber (e) condenser, absorber and separator (rectifier). Jianyong Chen et al. Q. Cooling tower is an important part of power plant. 4 show typical performance curves of a steam jet refrigeration cycle , . Analyze air refrigeration systems, vapor compression refrigeration systems, vapour absorption refrigeration systems, and steam jet refrigeration systems 3. Refrigerants - MCQs with Answers Q1. 7 Steam Jet Refrigeration. Since steam was widely available at that time, the so-called steam jet refrigeration systems became popular in … A nozzle is used in steam jet refrigeration systems to: a) To convert the high pressure motive steam into high velocity steam. The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is (a) same (b) more (c) less ( Log Out /  Ans: b. Induced steam jet draught. Q. 14.1.4. Identify various natural and artificial methods of refrigeration 2. Practice Test: Question Set - 13. Next . Engines - Two-Stroke & Non-Conventional Engines, I.C. 1.2 Objectives of the Refrigeration air conditioning. The working cycle in case of four stroke engine is completed in following number of revolutions of crankshaft (a) 1/2 (b) 1 (c) 2 (d) 4 (e) 8. Co-efficient of Performance (C.O.P.) Like air, it is perfectly safe. Figure 1. Engines - Measurements & Testing, Performance Parameters & Characteristics, Thermodynamics - Basics and Laws of Thermodynamics. An injector is a system of ducting and nozzles used to direct the flow of a high-pressure fluid in such a way that a lower pressure fluid is entrained in the jet and carried through a duct to a region of higher pressure. MCQs of Refrigeration & Air Conditioning. ( Log Out /  B.Decreses Your Comments. c) Q. Thermoelectric Refrigeration: An Introduction Thermoelectric cooling uses the Peltier effect to create a heat flux between the junctions of two different types of materials. MCQ No - 1 ... 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 … Does not effect. Refrigeration by Using Liquid Gasses. B. Conclusions The prototype steam jet refrigeration cycle driven by low-grade thermal energy is developed for testing at actual ambient condition in Thailand where the cooling water produced by cooling tower is between 29 and 33°C. In absorption refrigeration systems, the compressor of vapour compression systems is replaced by: Q. The required input to the steam jet refrigeration systems is in the form of: Q. In gas cycles, heat rejection and refrigeration take place as the gas undergoes sensible cooling and heating. STEAM JET COOLING SYSTEM Steam jet cooling system is a cooling technique which involves usage of steam and water for cooling purposes. • The load variations does not effect the performance of a vapour absorption system. In steam jet refrigeration systems, water can be used as the refrigerant. These systems were applied successfully to refrigeration. The Air Jet Refrigeration is based on the Bernoulli’s equation across a streamline. filling blanks-refrigeration; interview short question answers-conduction-3; boot strap and reduced ambient aircraft cooling systems; close coiled helical spring -axial torque; mcq … Figure 3.66 presents agreement in principle on the steam refrigeration cooling water systems. D. Remain same View Answer. Although superheating adds more energy to the steam in the form of heat there is no effect on pressure, which is determined by the rate at which steam is drawn from the boiler and the pressure settings of the safety valves. Q. The extinguishing effect of the foam is a combination of smothering and cooling. D. Boiling An Amount Of Water At High Pressure. 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