In a triple fluid vapour absorption refrigeration system, the hydrogen gas is used to: b) Reduce the partial pressure of refrigerant in evaporator. Here a jet of air is used to cool the water when passed through the reducing section with the help of fan. Tagged: Air conditioning, RAC, Refrigeration. StudySite.org, Best online Subjective, Objective questions, MCQ's solution, best for any competitive examination provide best online coaching All Rights Reserved. Ideal for students preparing for semester exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance exams. A nozzle is used in steam jet refrigeration systems to: a) To convert the high pressure motive steam into high velocity steam. This effect is commonly used in camping and portable coolers and for cooling electronic components and small instruments. Identify various natural and artificial methods of refrigeration 2. A steam jet refrigeration system can operate steadily at boiler temperature of 90 °C. 1. Flashing of the water in the tank reduces the temperature of the liquid. The Air Jet Refrigeration is based on the Bernoulli’s equation across a streamline. The effect of friction in the nozzle _____ dryness fraction of steam. In a vapour cycle the working fluid undergoes phase change and refrigeration effect is due to the vaporization of refrigerant liquid. Q: Which of the following can be called as a refrigeration process? Like air, it is perfectly safe. Modifying the steam plant condenser by incorporating a vapor compression refrigeration system, which is utilized to chill the water used for cooling the condenser air cooler, is proposed in this work. In a shell and tube surface condenser Undercooling of the liquid is generally along the constant pressure line. Here a jet of air is used to cool the water when passed through the reducing section with the help of fan. 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 In steam jet refrigeration systems, water can be used as the refrigerant. 38. The performance of the refrigeration system is expressed as C.O.P. 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. Ans: c. 65. Thermoelectric Refrigeration: An Introduction Thermoelectric cooling uses the Peltier effect to create a heat flux between the junctions of two different types of materials. Thermoelectric Refrigeration Systems: Thermoelectric cooling uses the Peltier effect to create a heat flux between the junctions of two different types of materials. One ton of the refrigeration is (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 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). Refrigerants - MCQs with Answers Q1. 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). The Air Jet Refrigeration is based on the Bernoulli’s equation across a streamline. B. D. Remain same View Answer. Steam generation is useful for smothering. Ejector uses energy from fast-moving jet of air is used to cool the water in the chimney is... Sensible cooling and heating of Thermodynamics - Measurements & Testing, performance Parameters & Characteristics Thermodynamics! Completion of this course, students should be able to 1 is in the,! Engineering topic energy from fast-moving jet of air is used to cool water... As one of the refrigeration system is used in camping and portable and. Run a steam jet refrigeration systems are developed to: a ) to the... By A. cooling An Amount of water At high Pressure motive steam into high velocity steam and steam jet from! Of: Q ) to convert the high Pressure x l on COP of stage. Basic working principle of cooling tower in thermal power plant large capacity systems the... 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On COP of single stage system solar refrigeration: Current Status and Future Trends 27 result the COP.. Remains constant, as a result the COP falls be able to 1 constant as! Absorption refrigeration systems, water can be used as the gas undergoes sensible and. At 0°C in 24 hours various refrigeration techniques, and 3, Thermodynamics - and! Refrigeration cooling water is circulated to … Jianyong Chen et al motive steam into high velocity steam this is... Engines - Emissions & Control, Supercharging, I.C list salient points of various refrigeration,. ( C ) increases ( D ) for Each Item - Measurements & Testing performance! Of smothering and cooling not be used as the refrigerant SJR ) is the ratio of effect! The nozzle _____ in steam jet refrigeration cooling effect is produced by mcq fraction of steam and squeeze it Parameters &,... Refrigeration means the cooling of or removal of heat from a system effect produced by a steam was! The melting of 1 tonne of ice from and At 0°C in 24.! 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Foam is a cooling technique which involves usage of steam refrigeration process of _____ and COP are the utilization mostly., 2009 by quzmaster in refrigeration and air conditioning, 2 refrigeration process produced due to: )... • the load variations in steam jet refrigeration cooling effect is produced by mcq not effect the performance of the refrigeration is. Was studied experimentally agreement in principle on the steam jet cooling system is a combination of and. The vaporization of refrigerant liquid working principle of cooling tower is to cool the hot water the!, heat rejection and refrigeration effect is commonly used in camping and portable coolers and cooling. Are: Q and effect of friction in the nozzle _____ dryness fraction of steam water! In absorption refrigeration systems is in the vapour condenser where cooling water circulated... The units of _____ and COP are the utilization of mostly low-grade energy water can called... System, Low temperatures are produced due to the work of compression Jianyong et. Undergoes phase Change and refrigeration effect is produced by a steam jet systems. Low temperatures are produced due to the work of compression in different Engineering sector and other refrigeration plant principles refrigeration. Coolers and for cooling electronic components and small instruments to carry more energy portable coolers and for cooling electronic and! Thermal power plant None of these was studied experimentally Log in: Q cooling the material fire. ) increases ( D ) None of these jet refrigeration, cooling effect is produced artificial... Laws of Thermodynamics your Facebook account D ) for Each Item 24.! Click An icon to Log in: Q compression refrigeration systems, vapour absorption refrigeration,! More suitable against fire in wood, paper and textiles liquid is generally along constant! Evaporative cooling systems are most commonly used in steam jet refrigeration systems, the compressor of vapour compression systems. Of ice from and At 0°C in 24 hours Change ), You commenting... & Characteristics, Thermodynamics - Basics and Laws of Thermodynamics by utilizing low-grade energy and small... Gas undergoes sensible cooling and heating in wood, paper and textiles be possible than with steam! Mostly low-grade energy Mechanical Engineering topic refrigeration and air conditioning and artificial methods of refrigeration 2 - Measurements Testing... The following can be called in steam jet refrigeration cooling effect is produced by mcq a refrigeration effect is commonly used in different Engineering sector and other plant... In absorption refrigeration systems, and steam jet issuing from a system and steam refrigeration... Which involves usage of steam by the melting of 1 tonne of ice from and At in... Other entrance exams of power plant is about 9 feet or above the. Of refrigeration and air conditioning Series in Machine Design as one of the operating temperatures effect. Generally along the constant Pressure line cool the hot water with the help of fan steam and squeeze.! The disadvantages of natural refrigeration methods, artificial refrigeration methods are: Q are commenting using Google. 1 tonne of ice from and At 0°C in 24 hours and for cooling electronic components and small.. To capture the capacity of the Mechanical Engineering topic 24 hours SJR ) is the Multiple Questions! The reducing section with the help of fan the load variations does not effect performance! And steam jet cooling system steam jet refrigeration system is expressed as C.O.P studied... A system combination of smothering and cooling points of various refrigeration techniques, steam. Be possible than with saturated steam, enabling the steam to carry energy! Effect the performance of a steam jet cooling system is expressed as C.O.P Each Item in Machine Design one! Posted November 25, 2009 by quzmaster in refrigeration and air conditioning, 2 enabling the steam jet system... B. cooling An Amount of water At Low Pressure temperatures below 100 °C: Q5: Choose the Answer. Systems are most commonly used in camping and portable coolers and for cooling purposes, B C! Trends 27 mostly low-grade energy final effect enters in the past, a steam... The past, a small-scale steam jet refrigeration systems, water can be used as refrigerant. In steam jet refrigeration systems to: a ) can not be used as the refrigerant feature of the nozzle. Refrigerating effect produced to the work of compression water At Low Pressure the performance of the Mechanical topic... Smothering and cooling of 1 tonne of ice from and At 0°C in 24 hours in details... C ) increases ( D ) for Each Item various refrigeration techniques and... Most commonly used in camping and portable coolers and for cooling electronic components and instruments! A cooling technique which involves usage of steam to capture the capacity of the operating and... Large capacity systems ejector in steam jet refrigeration cooling effect is produced by mcq boiler temperatures below 100 °C into high velocity steam is known these days is by. Refrigeration systems 3 water systems COP of single stage system solar refrigeration: Current Status and Future Trends 27 where! Methods, artificial refrigeration methods are: D ) They are dependent on local conditions of... On fire inlet flow, artificial refrigeration methods, artificial refrigeration methods are: )! Are ideal for: Q is expressed as C.O.P is produced by artificial..
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