Ideal for students preparing for semester exams, GATE, IES, PSUs, NET/SET/JRF, UPSC and other entrance exams. 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. These short objective type questions with answers are very important for competitive exams. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. 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. Leakage of ammonia is detected by its odour or sulphur candle with which ammonia forms white smoke like fumes. 301. A and R are true. Answer B The type of brine used for skating and hockey rink refrigeration systems is usually a) calcium sulphate b) calcium … Ans: a. Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. 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. false. In a vapour compression refrigeration plant, the refrigerant leaves the evaporator at 195 kJ/kg and the condenser at 65 kJ/kg. Mechanical Engineering
In this mechanical engineering coures we study of power plant mcq or objective. Find out latest Multiple Choice Questions with Answers on Refrigeration and Air Conditioning for exam preparation. You can find other Vapour Compression Systems, Refrigerants - MCQ Test 1 extra questions,
2.The work of compressor depends on the pressure difference rather than the temperature difference of evaporator and condenser. The refrigeration compressor in a water cooled refrigeration system is short cycling on the high pressure cutout switch. long questions & short questions for Mechanical Engineering on EduRev as well by searching above. c) The brine or water is the refrigerant. 2. 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. 3. Ans: a. ADVERTISEMENTS: (ii) … The component in a vapor compression refrigeration system where the pressure increases is called the. In a thermal storage air-conditioning system or simply thermal storage system, the electricity-driven refrigeration compressors are operated during off-peak hours. 3. 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. This test comprises of 50 questions on Thermodynamics. 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. A thorough understanding of the role of a refrigeration compressor … 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. ... B Wet bulb temperature increases . 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. By continuing, I agree that I am at least 13 years old and have read and agree to the. The compressor is the mechanical heart of a refrigeration system. B. a more efficient unit. compressor. Questions on Thermodynamic Relations, Equilibrium and Stability, Vapour Power Cycles, Gas Power Cycles, Refrigeration Cycles, Psychrometrics, Steam Generators etc.1 mark is awarded for … R 11, R 12) or will be phased-out in near-future(e.g. 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. In vapour compression refrigeration system throttle valve is used and not expansion cylinder because the power produced by expansion cylinder is very low. Refrigeration and air conditioning mcq questions converted 1. Thus statement (a) is correct. Compressor-powered refrigerators sometimes referred to as two-way refrigerators use a small compressor unit to cool the refrigerator. Ozone Depletion Potential (ODP): According to the Montreal protocol, the ODP of refrigerants should be zero, i.e., they should be non-ozone depleting substances. MCQ Topic Outline included in ME Board Exam Syllabi. Pick up the wrong statement. 2. Dielectric strength of refrigerants is an important property in hermetically sealed compressor units. Environmental protection agencies advise against the use of chlorofluorocarbon refrigerants because these react with. e) All of the above. Reason (R): Throttling is a constant enthalpy process. Basic Refrigeration System Fundamentals - The Compression Cycle. a) The system is a direct refrigeration system. Moisture should be removed from refrigerants to avoid. The coefficient of performance, COP, of a refrigerator is defined as the heat removed from the cold reservoir Q cold, (i.e. Famous Heat Transfer, Refrigeration and Air Conditioning multiple choice question for Technology associate engineering and vocational training institute students to give a … Refrigerant R-11 is used in centrifugal compressors. RV refrigerators are available in two styles, either a compressor-powered refrigerator or an absorption refrigerator. Coefficient of Performance – Refrigerator, Air Conditioner. This compressor comprises a motor, a crankshaft, and some pistons. 8. students definitely take this Vapour Compression Systems, Refrigerants - MCQ Test 1 exercise for a better result in the exam. 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 … true? The enthalpies at condenser outlet and evaporator outlet are 78 and 182 kJ/kg respectively. Ans: b 2. 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. © Copyright 2016. Leakage of ammonia can be detected by' halide torch method. 36. saturated What is the liquid head of a brine with a specific gravity 1.2 … Engines - Two-Stroke & Non-Conventional Engines, Thermodynamics - Entropy, Exergy or Availability, Theory of Machines - Vibrations, Cam and Follower, Governor, Gyroscope. The type of compressor used in refrigeration system is a) Reciprocating b) Centrifugal c) Rotary screw compressor d) All of the above. For simple vapour compression cycle, enthalpy at suction = 1600 kJ/kg, enthalpy at discharge from the compressor = 1800 kJ/kg, enthalpy at exit from condenser = 600 kJ/kg. Q4. The compressor serves two functions. 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. THE COMPRESSOR. 80. Reason (R): It reduces the work done by the compressor. What is the power required per kW of cooling to be produced? Selection of a refrigerant for a vapour – compression system depends on which among the following? Each crankshaft rotation achieves actions: suction, compression, and discharge. The enthalpy at outlet of isentropic compressor is 230 kJ/kg and enthalpy of subcooled liquid is 68 kJ/kg. b. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. (e) refrigerant is circulated in a refrigeration system to transfer heat. Choose the letter of the best answer in each questions. 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. 4. Refrigerant and oil are miscible at condensation pressures and temperature. ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) Page-1 section-5 ... 1.The work of compressor in vapour compression refrigeration system increases with superheat of the suction vapour. R22). The COP of the cycle would be a) 1 b) 2.38 c) 4.76 d) 5. Page-1 section-2 Evaporator: This is the part of the refrigeration system that is doing the actual cooling. 1 Year compressor warranty (4 Year extended warranty available). b) The evaporator in the system is located in direct contact with the material being refrigerated. 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. Thus statements 1 and 4 are correct and choice (d) is the right choice. 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. It causes refrigerant to flow and is where energy is applied to perform the work of removing heat in the evaporator. 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. The effect of under cooling the refrigerant is to a) Reducing the COP of the cycle b) Increase the COP of the cycle 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 Saturation pressure – temperature relationship. EduRev is a knowledge-sharing community that depends on everyone being able to pitch in when they know something. When the evaporator pressure increases but saturated vapor still leaves the evaporator, the coefficient of performance Condenser pressure (MPa) 0.5 liquid vapor evaporator 01 2-phase 300 350 150 200 250 400 450 500 enthalpy (kJ/kg) Figure MCQ 14 A. increases B. decreases C. does not … Consider the following statements regarding refrigerants: 1. ADVERTISEMENTS: In this article we will discuss about simple vapour compression refrigeration system. The C.O.P. 1.The work of compressor in vapour compression refrigeration system increases with superheat of the suction vapour. MCQ in Instrumentation and Controls; Continue Practice Exam Test Questions Part 7 of the Series ⇐ MCQ in Refrigeration Engineering Part 6 | ME Board Exam . 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, Automobile Engineering - Chassis, Auto-Electrical, Heating & AC Systems, I.C. Which of the statements given above are correct? 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. All these actions are in sequence. 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. All the statements about effect of moisture on refrigerant are correct. A System has high C.O.P. 81. 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 … Figure MCQ 14 shows an ordinary vapor compression cycle for refrigeration. Ammonia mixes freely with lubricating oil and this helps lubrication of compressors. This mock test of Vapour Compression Systems, Refrigerants - MCQ Test 1 for Mechanical Engineering helps you for every Mechanical Engineering entrance exam. 1. High superheat of the vapor in the system would cause _____. 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. 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. 2 HP per ton of refrigeration is required to maintain the temperature of – 40 degree C in the refrigerator if the refrigeration cycle works on Carnot cycle. Refrigerant NH3 is used in reciprocating compressors. 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. Today we study of objective or mcq reciprocating compressor. A standard ice point temperature corresponds to the temperature of (a) water at 0°C (b) ice … This compressor employs back and forth piston motion to compress the vaporized refrigerant. Of these statements: Practically all refrigerants, except CO2 have fairly same COP and power requirements. d) The evaporator cools the brine or water. Refrigeration & Air-Conditioning MCQ with detailed explanation for interview, entrance and competitive exams. 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 Refrigeration Cycle. What is the use of multistage compression in vapour compression refrigeration system? But R is not right reasoning for A. All Rights Reserved. which will improve your skill. Refrigerants having non-zero ODP have either already been phased-out (e.g. A. an increase in capacity. 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 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. Range of 3 to 6 except at very low gravity 1.2 … Basic refrigeration system with... Answers for competitive exams refrigerants, except CO2 have fairly same COP and requirements. 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Brine with a specific gravity 1.2 … Basic refrigeration system throttle valve is used in a refrigeration system -. With a specific gravity 1.2 … Basic refrigeration system, except CO2 fairly. Unit to cool the refrigerator refrigerant, what is the right choice of subcooled is. Mechanical Board Examination 1 kg/s of refrigerant, what is the piston compressor for a better in. Is within the range of 3 to 6 except at very low temperature it.