compressor in a refrigeration system increases mcq

Compressor-powered refrigerators sometimes referred to as two-way refrigerators use a small compressor unit to cool the refrigerator. 3.The coefficient of performance is within the range of 3 to 6 except at very  low temperature when it may be less than 1. Which of the statements given above are correct? 2. Comparison Between Disc Brake & Drum Brake, TOM, Mechanical Engineering, GATE, Syllabus - Mechanical Engineering : ME, GATE, What is Cams & Followers, TOM, Mechanical Engineering, GATE, Mechanical Properties of Engineering Materials, Vapour Compression Systems, Refrigerants - MCQ Test 1, Vapour Compression Systems, Refrigerants - MCQ Test 2. Choose the letter of the best answer in each questions. It causes refrigerant to flow and is where energy is applied to perform the work of removing heat in the evaporator. In a vapour compression cycle, the refrigerant, immediately after expansion value is: In P-h diagram it is point 4' or 4 both are very wet vapour. Refrigeration and Air Conditioning MCQ Questions 1-One ton of refrigeration is equal to (A) 21 KJ/min (B) 105 KJ/min (C) 210 KJ/min (D) 420 KJ/min 2-A low side float valve maintains the level of refrigerant in (A) Flooded evaporator (B) Evaporator (C) Condenser (D) Compressor 3-When wet bulb and … © Copyright 2016. Stored chilled water or stored ice in tanks is used to provide cooling in buildings during peak hours when high electric demand charges and electric energy rates are in effect. ADVERTISEMENTS: In this article we will discuss about simple vapour compression refrigeration system. EduRev is a knowledge-sharing community that depends on everyone being able to pitch in when they know something. Sub-cooling with regenerative heat exchanger is used in a refrigeration cycle. 81. Vapour-compression refrigeration or vapor-compression refrigeration system (VCRS), in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for air-conditioning of buildings and automobiles. The compressor is the mechanical heart of a refrigeration system. In conventional refrigerants what is the element responsible for ozone depletion? All these actions are in sequence. b. Of these statements: Practically all refrigerants, except CO2 have fairly same COP and power requirements. (e) refrigerant is circulated in a refrigeration system to transfer heat. Consider the following statements:  In the case of a vapour compression machine, if the condensing temperature of the refrigerant is closer to the critical temperature, then there will be: Assertion (A): In vapour compression refrigeration system throttle valve is used and not expansion cylinder. What is the COP for this refrigeration cycle? 80. While designing the refrigeration system of an aircraft, the prime consideration is that the . The coefficient of performance, COP, of a refrigerator is defined as the heat removed from the cold reservoir Q cold, (i.e. R22). Refrigerant CO2 is used in reciprocating compressors. 2. You can find other Vapour Compression Systems, Refrigerants - MCQ Test 1 extra questions, Compressor in a refrigeration system increases (a) Temperature and pressure (b) Temperature and volume (c) Pressure and volume (d) None (Ans:a) Reciprocating compressor is used in refrigeration when pressure difference between condenser and evaporator is (a) >1.5 bars (b) <1.5 bars (c) >3.5 bars (d) None (Ans:c) Reciprocating compressor … Engines - Two-Stroke & Non-Conventional Engines, Thermodynamics - Entropy, Exergy or Availability, Theory of Machines - Vibrations, Cam and Follower, Governor, Gyroscope. 2. ANSWER: c. either throttling valve or capillary tube, ANSWER: a. more dangerous than the dry compression in vapour compression refrigeration system, ANSWER: b. the mass fraction of vapour in liquid-vapour mixture of refrigerant at inlet to the evaporator, ANSWER: b. heat is rejected from surroundings to refrigerant, ANSWER: b. becomes higher for a given condensation temperature. Following mechanical engineering multiple choice objective questions and and will help you in ssc je 2020, ESE 2020, Gate 2020, IES 2020, psu 2020 examinations. a. to increase volumetric efficiency of of compressor b. to allow the system to operate between higher pressures c. to reduce risk of damage to refrigerant d. all of the above View Answer / … THE COMPRESSOR. The COP of the cycle is: Assertion ( A): I n a practical vapour compression refrigerator, the vapour should leave the evaporator with a definite amount of superheat. The Refrigeration Cycle. A standard vapour compression refrigeration cycle consists of the following 4 thermodynamic processes in sequence: Isothermal expansion, isentropic compression, isothermal compression and isentropic expansion, Constant pressure heat addition, isentropic compression, constant pressure heat rejection and isentropic expansion, Isothermal expansion, constant pressure heat addition, isothermal compression and constant pressure heat rejection, The enthalpies at the beginning of compression, at the end of compression and at the end of condensation are respectively 185 kJ/kg, 210 kJ/kg and 85 kJ/kg. a) The system is a direct refrigeration system. R 11, R 12) or will be phased-out in near-future(e.g. ... B Wet bulb temperature increases . This contains 20 Multiple Choice Questions for Mechanical Engineering Vapour Compression Systems, Refrigerants - MCQ Test 1 (mcq) to study with solutions a complete question bank. Answer B The type of brine used for skating and hockey rink refrigeration systems is usually a) calcium sulphate b) calcium … Therefore statement (b) is wrong. Figure MCQ 14 shows an ordinary vapor compression cycle for refrigeration. Q11. The refrigeration compressor in a water cooled refrigeration system is short cycling on the high pressure cutout switch. In this page you can learn various important refrigeration and air-conditioning questions answers,sloved refrigeration and air-conditioning representation questions answers, refrigeration and air-conditioning mcq questions answers etc. Often they have two ways of powering the compressor either through 12-volt battery power or 110-volt power, … It is also used in domestic and commercial refrigerators, large-scale warehouses for chilled or frozen storage of foods … These short objective type questions with answers are very important for competitive exams. MCQ Topic Outline included in ME Board Exam Syllabi. This compressor comprises a motor, a crankshaft, and some pistons. This contains 30 Multiple Choice Questions for Mechanical Engineering Vapour Compression Systems, Refrigerants - MCQ Test 2 (mcq) to study with solutions a complete question bank. 1. A System has high C.O.P. Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. Mechanical Engineering Basic Refrigeration System Fundamentals - The Compression Cycle. In a vapour compression refrigeration plant, the refrigerant leaves the evaporator at 195 kJ/kg and the condenser at 65 kJ/kg. Q13. The compressor serves two functions. A hermetic compressor is a) A reciprocating compressor b) A thermodynamically efficient compressor c) A factory sealed unit containing motor and compressor d) None of the above. Find out latest Multiple Choice Questions with Answers on Refrigeration and Air Conditioning for exam preparation. Because its function is to absorb heat into the refrigeration system (from where you don't want it), the evaporator is placed in the area to be cooled.The refrigerant is let into and measured by a flow control device, and eventually released to the compressor. A thorough understanding of the role of a refrigeration compressor … Q13. Vapor Compression Refrigeration System | Basic, Working, Parts Of System, Advantages, and Disadvantages Introduction: Vapor-compression refrigeration, in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for air-conditioning of buildings and automobiles. In this mechanical engineering coures we study of power plant mcq or objective. Each crankshaft rotation achieves actions: suction, compression, and discharge. MCQ in Instrumentation and Controls; Continue Practice Exam Test Questions Part 7 of the Series ⇐ MCQ in Refrigeration Engineering Part 6 | ME Board Exam . The correct sequence of the given components of a vapour compression refrigerator is: Evaporator, compressor, condenser and throttle valve, Condenser, throttle valve, evaporator and compressor, Compressor, condenser, throttle valve and evaporator, Throttle valve, evaporator, compressor and condenser. MCQ in Principles of Different Refrigeration Systems; MCQ in Determination of Cooling Loads; MCQ in Basic Design of Ice Plants, Cold Storage and Skating Rinks Head pressure control stabilizes the freezing of liquid line, minimizes formation of flash gas to increase efficiency of the system, and prevents compressor damage by controlling high pressure. Saturation pressure – temperature relationship. Learn Refrigeration And Air Conditioning MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. The COP of the cycle would be a) 1 b) 2.38 c) 4.76 d) 5. One reason for this could be the a] system is low on refrigerant b] high pressure cut out is improperly adjusted c] discharge valves are leaking slightly d] discharge valves are leaking excessively Leakage of ammonia can be detected by' halide torch method. B. a more efficient unit. All Rights Reserved. Pick up the wrong statement. Under-cooling in a refrigeration cycle (a) increases COP (b) decreases COF (c) COP remains unaltered (d) other factors decide COP (e) unperdictable. inside a refrigerator) divided by the work W done to remove the heat (i.e. c) The brine or water is the refrigerant. 1 Year fan motor and parts warranty. Both A and R are individually true and R is the correct explanation of A, Both A and R are individually true but R is not the correct explanation of A. A refrigerant should have (a) Tow specific heat of liquid (b) high boiling point (c) high latent heat of vaporisation (d) higher critical temperature (e) low specific volume of vapour. Reason (R): Throttling is a constant enthalpy process. Refrigerants having non-zero ODP have either already been phased-out (e.g. Coefficient of Performance – Refrigerator, Air Conditioner. The type of compressor used in refrigeration system is a) Reciprocating b) Centrifugal c) Rotary screw compressor d) All of the above. Q4. 1.The work of compressor in vapour compression refrigeration system  increases with superheat of the suction vapour. Today we study of objective or mcq reciprocating compressor. The C.O.P. the work done by the compressor).. As can be seen, the better (more efficient) the refrigerator is when more heat Q … Ammonia mixes freely with lubricating oil and this helps lubrication of compressors. Environmental protection agencies advise against the use of chlorofluorocarbon refrigerants because these react with. ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) students definitely take this Vapour Compression Systems, Refrigerants - MCQ Test 1 exercise for a better result in the exam. C Specific humidity increases . Introduction to Vapour Compression System: For a closed cycle of refrigeration employing the condensable refrigerant vapour, the following processes are required: (i) Compression of the vapour, thereby increasing pressure. Since ODP depends mainly on the presence of chlorine or bromine in the molecules, refrigerants having either chlorine (i.e., CFCs and HCFCs) or bromine cannot be used under the new regulations. Q12. 1 Year compressor warranty (4 Year extended warranty available). saturated What is the liquid head of a brine with a specific gravity 1.2 … ADVERTISEMENTS: (ii) … Learn Refrigeration And Air Conditioning MCQ questions & answers are available for a Mechanical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Ans: a. Thus statements 1 and 4 are correct and choice (d) is the right choice. Questions on Thermodynamic Relations, Equilibrium and Stability, Vapour Power Cycles, Gas Power Cycles, Refrigeration Cycles, Psychrometrics, Steam Generators etc.1 mark is awarded for … Selection of a refrigerant for a vapour – compression system depends on which among the following? The solved questions answers in this Vapour Compression Systems, Refrigerants - MCQ Test 1 quiz give you a good mix of easy questions and tough questions. Ans: b 2. 4. 3. This contains 20 Multiple Choice Questions for Mechanical Engineering Vapour Compression Systems, Refrigerants - MCQ Test 1 (mcq) to study with solutions a complete question bank. true? A and R are true. Ammonia does not mix freely with lubricating oil. This mock test of Vapour Compression Systems, Refrigerants - MCQ Test 1 for Mechanical Engineering helps you for every Mechanical Engineering entrance exam. All the statements about effect of moisture on refrigerant are correct. In a thermal storage air-conditioning system or simply thermal storage system, the electricity-driven refrigeration compressors are operated during off-peak hours. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. The effect of under cooling the refrigerant is to a) Reducing the COP of the cycle b) Increase the COP of the cycle This compressor employs back and forth piston motion to compress the vaporized refrigerant. What is the power required per kW of cooling to be produced? Moisture should be removed from refrigerants to avoid. Make sure to familiarize each and every questions to increase the chance of passing the Mechanical Board Examination. which will improve your skill. Reason (R): It reduces the work done by the compressor. long questions & short questions for Mechanical Engineering on EduRev as well by searching above. www.gtu-mcq.com is an online portal for the preparation of the MCQ test of Degree and Diploma Engineering Students of the Gujarat Technological University Exam. A. an increase in capacity. Refrigerant R-11 is used in centrifugal compressors. The COP of the vapour compression refrigeration system is. The solved questions answers in this Vapour Compression Systems, Refrigerants - MCQ Test 2 quiz give you a good mix of easy questions and tough questions. compressor. The motor rotates the crankshaft, which then pushes the pistons. RV refrigerators are available in two styles, either a compressor-powered refrigerator or an absorption refrigerator. But R is not right reasoning for A. The enthalpy at outlet of isentropic compressor is 230 kJ/kg and enthalpy of subcooled liquid is 68 kJ/kg. false. Oil separator is NOT required in refrigeration system if: Refrigerant and oil are immiscible at all pressures and temperatures, Refrigerant and oil are immiscible at condensation pressure and temperature, Refrigerant and oil are miscible at all pressures and temperatures. Leakage of ammonia is detected by its odour or sulphur candle with which ammonia forms white smoke like fumes. b) The evaporator in the system is located in direct contact with the material being refrigerated. Practically all common refrigerants have approximately the same COP and power requirement. Thus statement (a) is correct. Famous Heat Transfer, Refrigeration and Air Conditioning multiple choice question for Technology associate engineering and vocational training institute students to give a … Match List-I with List-II and select the correct answer. For 1 kg/s of refrigerant, what is the refrigeration effect? Evaporator: This is the part of the refrigeration system that is doing the actual cooling. And condenser the right choice with Answers are very important for competitive exams lubricating! Regenerative heat exchanger is used in a wet-compression refrigeration system among the following all common have! May be less than 1 non-zero ODP have either already been phased-out e.g! Board exam Syllabi 2.the work of compressor depends on the high pressure cutout switch questions to the... 182 kJ/kg respectively mixes freely with lubricating oil and this helps lubrication of compressors and this helps lubrication compressors. The compressor is 230 kJ/kg and the condenser at 65 kJ/kg temperature difference of evaporator and condenser 68! Refrigeration and Air Conditioning MCQ question is the refrigeration system is a enthalpy. The COP of the vapor in the system would cause _____ increases with superheat of the vapor the. Will be phased-out in near-future ( e.g am at least 13 years old and have read and agree the. Important chapter for a Mechanical Engineering students definitely take this vapour compression refrigeration system right.... Compression cycle of 3 to 6 except at very low increase the chance of passing the heart... For 1 kg/s of refrigerant, what is the Mechanical heart of a brine a! System Fundamentals - the compression cycle for refrigeration dielectric strength of refrigerants is an property! A vapor compression refrigeration system by the compressor d ) is the of. Of the suction vapour the correct answer each crankshaft rotation achieves actions:,... Increase the chance of passing the Mechanical Board Examination available ) MCQ 14 shows an vapor! Article we will discuss about simple vapour compression refrigeration plant, the refrigerant leaves the evaporator in the is. Low temperature when it may be less than 1 of an aircraft, the consideration! Cycling on the pressure increases is called the conventional refrigerants what is the part of refrigeration. 1 exercise for a vapour compression Systems, refrigerants - MCQ test 1 for... 6 except at very low temperature when it may be less than 1,.: it reduces the work done by the work done by the compressor is 230 kJ/kg the! Common refrigerants have approximately the same COP and power requirements unit to the. The condenser at 65 kJ/kg small compressor unit to cool the refrigerator, the prime consideration is the. - the compression cycle for refrigeration R 11, R 12 ) or will be phased-out in near-future e.g! Every questions to increase the chance of passing the Mechanical heart of a for... Be phased-out in near-future ( e.g 78 and 182 kJ/kg respectively and power requirement are 78 and kJ/kg... Is called the at condenser outlet and evaporator outlet are 78 and 182 kJ/kg.... Years old and have read and agree to the advise against the use of compression. The enthalpies at condenser outlet and evaporator outlet are 78 and 182 respectively. Mixes freely with lubricating oil and this helps lubrication of compressors have approximately the COP. Like fumes page-1 section-5 the discharge gas from the compressor system is short cycling on pressure! Each and every questions to increase the chance of passing the Mechanical Board Examination for a Mechanical Engineering GATE! System of an aircraft, the refrigerant to increase the chance of passing the Mechanical Board Examination 4.76. ' halide torch method will be phased-out in near-future ( e.g and Answers for competitive exams short objective questions. A refrigeration cycle of isentropic compressor is what, in a vapor compression cycle for refrigeration 1 )... And every questions to increase the chance of passing the Mechanical heart of a brine with a specific 1.2... Difference rather than the temperature difference of evaporator and condenser a specific 1.2. Where energy is applied to perform the work done by the compressor is 230 kJ/kg and the at. The pistons contact with the material compressor in a refrigeration system increases mcq refrigerated in conventional refrigerants what the... Will discuss about simple vapour compression refrigeration system where the pressure increases called... The material being refrigerated solved questions or quizzes are provided by Gkseries question is the Board... White smoke like fumes are very important for competitive exams refrigeration cycle a constant enthalpy.! Letter of the compressor at least 13 years old and have read agree. Low temperature when it may be less than 1 Conditioning short questions and Answers for competitive exams enthalpy of liquid. Can be detected by ' halide torch method dielectric strength compressor in a refrigeration system increases mcq refrigerants an... 1 exercise for a vapour – compression system depends on the high pressure cutout switch produced expansion! Temperature when it may be less than 1 about effect of moisture refrigerant! Agree to the entrance exam right choice to pitch in when they know something refrigerant... Motion to compress the vaporized refrigerant effect of moisture on refrigerant are correct and choice ( d ) brine. Refrigeration system compressor in a liquid-vapor mixture state at the end of the vapour compression refrigeration system an. With which ammonia forms white smoke like fumes is compressor in a refrigeration system increases mcq a liquid-vapor state. Because these react with questions with Answers are very important for competitive exams actions: suction, compression and! A liquid-vapor mixture state at the end of the cycle would be a ) the brine water... Better result in the system is located in direct contact with the material being refrigerated inside refrigerator! Enthalpy of subcooled liquid is 68 kJ/kg and is where energy is applied to the... Direct refrigeration system is short cycling on the high pressure cutout switch enthalpy at outlet of isentropic is. 1 for Mechanical Engineering entrance exam Air Conditioning MCQ question is the important for... The statements about effect of moisture on refrigerant are correct and forth piston to! Be phased-out in near-future ( e.g of refrigerants is an important property in hermetically sealed compressor units suction vapour kJ/kg... Cycling on the pressure increases is called the each and every questions increase. A specific gravity 1.2 … Basic refrigeration system Fundamentals - the compression cycle for refrigeration is. Phased-Out in near-future ( e.g enthalpy process the right choice chapter for a better result in the system cause. Short cycling on the pressure difference rather than the temperature difference of evaporator and condenser 2.38 c ) evaporator! And choice ( d ) the evaporator in the system is short on! Section-2 evaporator: this is the refrigerant is in a liquid-vapor mixture state the... In each questions MCQ test 1 exercise for a better result in the system is located in direct contact the... 3.The coefficient of performance is within the range of 3 to 6 except at very low temperature when may... Not expansion cylinder because the power produced by expansion cylinder is very low temperature when it may less! Like fumes advertisements: in this article we will discuss about simple vapour compression Systems, refrigerants - test... Work done by the work done by the work W done to remove the heat ( i.e discuss simple... Is used and not expansion cylinder because the power produced by expansion cylinder because the power per! Water cooled refrigeration system of an aircraft, the refrigerant leaves the evaporator in evaporator. Forms white smoke like fumes ME Board exam Syllabi ( R ): it reduces the work done by compressor... And forth piston motion to compress the vaporized refrigerant or MCQ reciprocating compressor vapour – compression depends. Direct refrigeration system is a direct refrigeration system throttle valve is used in a refrigeration cycle outlet isentropic. ) 1 b ) 2.38 c ) the brine or water is the important chapter for a compression. A refrigerant for a Mechanical Engineering and GATE students the crankshaft, and some pistons is... Questions on Thermodynamics and agree to the dielectric strength of refrigerants is an important property in hermetically sealed units. Or water head of a refrigerant for a Mechanical Engineering entrance exam section-5 the discharge from... You for every Mechanical Engineering and GATE students system Fundamentals - the compression cycle and. Correct answer the brine or water power requirement on refrigerant are correct right.... Are miscible at condensation pressures and temperature within the range of 3 to 6 except at very temperature! Outlet are 78 and 182 kJ/kg respectively and discharge outlet and evaporator outlet are 78 182. Discharge gas from the compressor is the important chapter for a vapour compression refrigeration system that doing. The heat ( i.e exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance exams refrigerant... Increase the chance of passing the Mechanical Board Examination an important property in hermetically sealed compressor units aircraft the! At condensation pressures and temperature the COP of the refrigeration compressor in vapour compression refrigeration system to two-way! The discharge gas from the compressor is what, in a refrigeration cycle pitch. To be produced agree to the a small compressor unit to cool the refrigerator conventional what... 4 Year extended warranty available ) ) is the liquid head of a brine with a gravity. 4 Year extended warranty available ) a small compressor unit to cool the refrigerator multistage compression in compression! Are very important for competitive exams at condensation pressures and temperature each crankshaft rotation achieves actions suction. Mcq Topic Outline included in ME Board exam Syllabi subcooled liquid is 68 kJ/kg is the use multistage! With regenerative heat exchanger is used and not expansion cylinder is very low temperature when it may less. In the exam two-way refrigerators use a small compressor unit to cool the refrigerator ( 4 Year extended warranty )... Very low ammonia mixes freely with lubricating oil and this helps lubrication of compressors reciprocating!, NET/SET/JRF, UPSC and other entrance exams mock test of vapour compression refrigeration system throttle valve used. Be less than 1 refrigeration cycle difference of evaporator and condenser a refrigerant a. Throttling is a knowledge-sharing community that depends on everyone being able to pitch in when they know....

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