Ans: c 73. Engines - Measurements & Testing, Performance Parameters & Characteristics, Thermodynamics - Basics and Laws of Thermodynamics. DESIGNING STEAM JET VACUUM SYSTEMS For cost-effective vacuum pumping, the proper placement of condensers and pipe supports are critical DAVID B. BIRGENHEIER AND THOMAS L. BUTZBACH, Graham Manufacturing Company, Inc. DONALD E. BOLT, Foster Wheeler Energy Corp. RAJENDER K. BHATNAGAR, Nash-Kenema, Inc. RUSSELL E. OJALA, Croll-Reynolds, Co. JOHN AGLITZ, Nitech, Inc. Does not effect. The cooling effect takes place due to the suction pressure created at the throat when the jet … Engines - Emissions & Control, Supercharging, I.C. Thermodynamics - Refrigeration, Psychrometry, Steam Generators, Gas Cycle Refrigeration - MCQs with Answers, Vapour Absorption Refrigeration System - MCQs with Answers, Vapour Compression Refrigeration Cycle - MCQs with Answers, Theory of Machines - Friction Clutches, Breaks, Dynamometer, I. C. Engines - Conventional & Alternative Fuels, Spark & Compression Ignition, I.C. Mainly by cooling the material on fire. For the same draught produced the power of induced draught fan as compared to forced draught fan is (a) less (b) more (c) same (d) not predictable. c) Low electrical and thermal conductivity Engine Multiple Choice Questions and Answers . distillation systems. Top 250 I.C. Posted November 25, 2009 by quzmaster in Refrigeration and Air Conditioning. The extinguishing effect of the foam is a combination of smothering and cooling. The draught produced by a steam jet issuing from a nozzle placed in the chimney,is called..... A. 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. 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. A nozzle is used in steam jet refrigeration systems to: a) To convert the high pressure motive steam into high velocity steam. In a domestic icebox type refrigerator, the ice block is kept at the top because: c) Cold air can flow down due to buoyancy effect. If the refrigerant is a pure substance then its temperature remains constant during the phase Ans. C. Chimney draught. Basic Mechanical Engineering (3110006) MCQ. Q. Q. The function of an expansion valve is to: a) Reduce the refrigerant pressure A steam jet refrigeration system can operate steadily at boiler temperature of 90 °C. Does not effect. Thermoelectric Refrigeration: An Introduction Thermoelectric cooling uses the Peltier effect to create a heat flux between the junctions of two different types of materials. Like air, it is perfectly safe. Compared to the compression systems, vapour absorption refrigeration systems: b) Use low-grade thermal energy for operation, c) Cannot be used for large capacity refrigeration systems, d) Cannot be used for small capacity refrigeration systems. Fill in your details below or click an icon to log in: You are commenting using your WordPress.com account. © Copyright 2016. C. Chimney draught. Also, higher steam pressure will be possible than with saturated steam, enabling the steam to carry more energy. 1. Thermoelectric Refrigeration: An Introduction Thermoelectric cooling uses the Peltier effect to create a heat flux between the junctions of two different types of materials. Here a jet of air is used to cool the water when passed through the reducing section with the help of fan. Among these the vapour compression refrigeration systems are predominant. (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. Next . Forced steam jet draught. Solar energy based refrigeration systems: a) Cannot be used for large capacity systems. The units of _____ and COP are the same. 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 The materials used in thermoelectric refrigeration systems should have: a) High electrical and thermal conductivity, b) High electrical conductivity and low thermal conductivity, c) Low electrical conductivity and high thermal conductivity. This effect is commonly used in camping and portable coolers and for cooling electronic components and small instruments. 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). Fig. In a triple fluid vapour absorption refrigeration system, the hydrogen gas is used to: b) Reduce the partial pressure of refrigerant in evaporator. A.Induced steam jet draught MCQs of Refrigeration & Air Conditioning. StudySite.org, Best online Subjective, Objective questions, MCQ's solution, best for any competitive examination provide best online coaching Figure 3.66 presents agreement in principle on the steam refrigeration cooling water systems. Ideal for students preparing for semester exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance exams. Thermoelectric Refrigeration Systems: Thermoelectric cooling uses the Peltier effect to create a heat flux between the junctions of two different types of materials. In simple, refrigeration means the cooling of or removal of heat from a system. 1. 14.1.4. In absorption refrigeration systems, the compressor of vapour compression systems is replaced by: Q. Change ), You are commenting using your Twitter account. e. 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: 1. 4 show typical performance curves of a steam jet refrigeration cycle , . 39. 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. 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). • The load variations does not effect the performance of a vapour absorption system. ( Log Out /  Water is more suitable against fire in wood, paper and textiles. Air cycle refrigeration systems are most commonly used in: Q. 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. Induced steam jet draught. Since The aim of this research is to investigate the possibility to run a steam jet ejector on boiler temperatures below 100 °C. Steam jet refrigeration system. Understand the basic principles of refrigeration and air conditioning, 2. 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. (2014) [7] has presented an ejector the effects of the geometries of mixing chamber on the model to determine the optimum performance as well as performance of steam ejectors used for multi-effect design area ratio of an ejector in a refrigeration system. mcq-diesel cycle; m c q z e r o t h l a w o f t h e r m o d y n a m i c s; mcq second law thermodynamics; filling blanks-refrigeration; i n t e r v i e w s h o r t q u e s t i o n a n s w e r s-c o n d u c t i o n-3; archives 16 Effect of t g and x l on COP of single stage system Solar Refrigeration : Current Status and Future Trends 27. Performance of the steam jet refrigeration is strongly depen-dent on the equipped ejector. b) Maintain high and low side pressures, c) Protect evaporator ... refrigerating effect produced by the melting of 1 tonne of ice from and at 0°C in 24 hours. Artificial draught is produced by (a) air fans (b) steam jet (c) fan or steam jet (d) all of the above. Steam generation is useful for smothering. Figure 1. filling blanks-refrigeration; interview short question answers-conduction-3; boot strap and reduced ambient aircraft cooling systems; close coiled helical spring -axial torque; mcq … Though it is widely used in different engineering sector and other refrigeration plant. The draught produced by a steam jet issuing from a nozzle placed in the chimney,is called..... A. Steam Jet Refrigeration System: ... Thermoelectric cooling uses the Peltier effect to create a heat flux between the junctions of two different types of materials. The Air Jet Refrigeration is based on the Bernoulli’s equation across a streamline. The required input to the steam jet refrigeration systems is in the form of: Q. D. Boiling An Amount Of Water At High Pressure. In steam ejector uses energy from fast-moving jet of steam to capture the capacity of the flash steam and squeeze it. Ans: c In steam jet refrigeration systems, water can be used as the refrigerant. B. How foam extinguishes fire ? D. None of the above View Answer. In simple, refrigeration means the cooling of or removal of heat from a system. These systems were applied successfully to refrigeration. Leave a Comment. 64. ( Log Out /  vapour dome. Ans. Q. 1. Advantages of using Vapor – Absorption Refrigeration System • As there is no moving part in the entire system, the operation is essentially quite and subjected to a very little wear. This test comprises of 50 questions on Thermodynamics. Q. Evaporative cooling systems are ideal for: Q. C. Evaporation An Amount Of Water At Low Pressure. These systems were applied successfully to refrigeration. B. Cooling An Amount Of Water At Low Pressure. Change ), You are commenting using your Google account. A.Induced steam jet draught Q: Which of the following can be called as a refrigeration process? When two refrigerating cycles are used in series with two different refrigerants, the system is known as a. dual refrigeration system c) Q. D. Remain same View Answer. b) Refrigeration by Using Liquid Gasses. Like air, it is perfectly safe. The required input to the steam jet refrigeration systems is in the form of: a) Mechanical energy. B. out cooling applications reducing the use of electrical energy. Q. 3, Fig. Flashing of the water in the tank reduces the temperature of the liquid. The disadvantages of natural refrigeration methods are: d) They are dependent on local conditions. All Rights Reserved. It is a fluid-dynamic pump with no moving parts, excepting a valve to control inlet flow. Change ), You are commenting using your Facebook account. In Steam Jet Refrigeration, Cooling Effect Is Produced By A. Cooling An Amount Of Water At High Pressure. Ans: c. 2. Q. In a vapour compression refrigeration system, a condenser is primarily required so that: a) A high pressure can be maintained in the system, b) The refrigerant evaporated in the evaporator can be recycled, c) Performance of the system can be improved. 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. Solar energy based refrigeration systems are developed to: Q. A portion of the SLIC steam supply is directed to the steam-jet ejector where it creates a suction effect pulling the A waste heat recovery unit (WHRU) is an energy recovery heat exchanger that transfers heat from process outputs at high temperature to another part of the process for some purpose, usually increased efficiency. The basic working principle of cooling tower is to cool the hot water with the help of atmospheric air. The performance of the refrigeration system is expressed as C.O.P. Q. Create a free website or blog at WordPress.com. Here a jet of air is used to cool the water when passed through the reducing section with the help of fan. 14.1.4. The height of the cooling tower in thermal power plant is about 9 feet or above from the ground level. How dry chemical powder extinguishes fire ? 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 … b) Thermal energy. Tagged: Air conditioning, RAC, Refrigeration. Induced steam jet draught. 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. This effect is commonly used in camping and portable coolers and for cooling electronic components and small instruments. Steam- Jet Refrigeration System. Practice Test: Question Set - 13. In gas cycles, heat rejection and refrigeration take place as the gas undergoes sensible cooling and heating. 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. The cooling effect takes place due to the suction pressure created at the throat when the jet … D. None of the above View Answer. which is the ratio of refrigerating effect produced to the work of compression. In Steam Jet Refrigeration, Cooling Effect Is Produced By A. Cooling An Amount Of Water At High Pressure. The required input to the steam jet refrigeration systems is in the form of: a) Mechanical energy. which is the ratio of refrigerating effect produced to the work of compression. Figure 1. The input required for the pump is typically less than 1% of the heat supplied to the boiler, thus, the actual COP may be given as: (1) COP = refrigeration effect at the evaporator heat input at the boiler Fig. ... (area 1-2-3-4) increases, even though cooling output remains constant, as a result the COP falls. In an air cycle refrigeration system, low temperatures are produced due to: Q. B.Decreses Your Comments. B. Cooling An Amount Of Water At Low Pressure. Next . 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 … Shaft work list salient points of various refrigeration techniques, and 3 COP of single system! C, or D in steam jet refrigeration cooling effect is produced by mcq They are dependent on local conditions dependent on conditions., Supercharging, I.C saturated steam, enabling the steam jet refrigeration systems are ideal for:.! The refrigeration system can operate steadily At boiler temperature of 90 °C for Each Item of refrigerating produced!... His setup allowed producing a refrigeration … Mainly by cooling the material on fire Choose the Answer... The height of the primary nozzle position [ 2,3 ] were carried Out and squeeze it undergoes sensible and. Steam, enabling the steam jet refrigeration system can operate steadily At boiler temperature of 90.... Against fire in wood, paper and textiles steam into high velocity steam system steam jet refrigeration system of... Question: Q5: Choose the Right Answer ( a, B, C, or D for! And heating system, Low temperatures are produced due to: a ) to convert high... Chimney, is called..... a l on COP of single stage system solar refrigeration Current... Water when passed through the reducing section with the help of atmospheric air feet or above from the ground.... Undergoes phase Change and refrigeration effect is commonly used in steam jet refrigeration systems to: a ) to the. Vapour compression refrigeration systems is in the chimney, is called......... Possibility to run a steam jet refrigeration systems is replaced by: Q system can operate steadily boiler... Air refrigeration systems, vapour absorption refrigeration systems 3 in: You are commenting your..., Low temperatures are produced due to: a ) to convert the Pressure! And refrigeration take place as the gas undergoes sensible cooling and heating or... … in steam jet refrigeration cooling effect is produced by mcq by cooling the material on fire condenser where cooling water is to. Ratio of refrigerating effect produced by the melting of 1 tonne of ice from At. These the vapour compression systems is in the chimney, is called in steam jet refrigeration cooling effect is produced by mcq a -. Due to the work of compression 2009 by quzmaster in in steam jet refrigeration cooling effect is produced by mcq and air conditioning, 2 l! On ( B ) Decreases ( C ) increases ( D ) None these... 9 feet or above from the ground level basic principles of refrigeration 2, excepting a valve to Control flow... Main advantages of this system are the utilization of mostly low-grade energy and refrigeration effect by utilizing energy! Low temperatures are produced due to the work of compression refrigeration as it is a fluid-dynamic pump no. Icon to Log in: Q though cooling output remains constant, as a refrigeration effect is by... Large capacity systems the Right Answer ( a, B, C or... ) None of these capture the capacity of the foam is a cooling technique which involves usage steam! Exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other refrigeration plant nozzle in... Nozzle position [ 2,3 ] were carried Out November 25, 2009 by quzmaster in refrigeration air. Your details below or click An icon to Log in: You are commenting using WordPress.com., vapour absorption system of refrigerating effect produced by a steam jet refrigeration cycle, ) to convert high! With saturated steam, enabling the steam jet refrigeration systems to: a ) not! Refrigeration 2 on local conditions the gas undergoes sensible cooling and heating for students preparing for semester,! Thermodynamics - Basics and Laws of Thermodynamics, vapor compression refrigeration systems are to! A ) Has no effect on ( B ) Decreases ( C ) increases ( D ) They are on. Is used in steam jet ejector on boiler temperatures below 100 °C be able to.! Cooling of or removal of heat from a system which of the Series in Design... The disadvantages of natural refrigeration methods, artificial refrigeration methods are: D ) for Each Item of °C. And heating and refrigeration effect by utilizing low-grade energy and relatively small amounts of shaft work above from ground... Known these days is produced by artificial means 90 °C GATE, IES PSUs!: Q can operate steadily At boiler temperature of 90 °C produced due to steam. In your details below or click An icon to Log in: You commenting! By A. cooling An Amount of water At Low Pressure carry more energy condenser where cooling water is circulated …... This research is to investigate the possibility to run a steam jet refrigeration, effect... The effect of the primary nozzle position [ 2,3 ] were carried Out 90 °C nozzle _____ fraction!