Answer: b Since for isentropic compression process. The heat required to melt 1 tonne of ice in 12 hours is equivalent to. Answer: d In refrigeration systems, two or more compressors are connected in series, figure 3-11. MCQs of Vapour Compression System. In addition to this, the temperature of refrigerant gas after compression is at lower temperature in case of multi-stage compression as compared to single stage compression system. When two refrigerating cycles are used in series with two different refrigerants, the system is known as a. dual refrigeration system b. cascade refrigeration system c. vapour absorption refrigeration system d. none of the above View Answer / Hide Answer 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. If R600a or R290 were to be charged into an unchanged refrigeration system, the charge amount counted in grams would be much lower. Components Of Refrigeration Systems. 6. View Answer. With the help of 4BEngineers, students can avail online coaching through video lecture at an unimaginably affordable cost, access the coaching content from renowned teaching experts, and be one on one with their personal favorite coach. Reason (R): It is almost impossible for Freon-12 leakage to attain a fatal concentration. First of all, please watch my important question videos of Rac, chapter wise after that you can visit here, where you show the answers to those questions and some MCQ regarding this chapter...... 2. What is the result of superheating of vapour at the evaporator outlet? Answer: d When the exhaust pressure is higher than 2.5MAPa, two compressors can be adopted, which are driven by two main motors. A standard ice point temperature corresponds to the temperature of (a) water at 0°C (b) ice … Q21.The intercooler pressure is given by In this video I explained the MCQ, true false type MCQ with solution and description of answer for a chapter vapour compression refrigeration system. The Following Section consists Multiple Choice Questions on Basic Mechanical Engineering. A Vapor Compression Refrigeration system has a 281W, 50 Hz compressor with displacement 11.1 cm3/rev. 0. 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 MCQ In vapor compression refrigeration system, at entrance to which component the working fluid is superheated vapor? 2. c) both of the mentioned a) capillary tubes The leaks in a refrigeration system freon are detected by: A halide torch, which on detecting produces greenish flame lighting, Sulphur sticks, which on detecting give white smoke. Found site related problem + Download crome browser for best view Don't use mini version (opera, uc browser etc.) 3. Typical compressor capacity rating data is based on an industry standard of a 65°F return vapor temperature. Explanation: These are a group of halogenated hydrocarbons. Mechanical refrigeration, is the utilization of mechanical components arranged in a "refrigeration system" for the purpose of transferring heat. Which of the following statement is true for a condenser? Prototypes have shown the ability to provide a 7°C of cold source at an ambient temperature of 30°C (COP equals to 3–7), comparable or higher than that of vapour compression heat pump systems. However, system chemistry and heat exchangers are complex, refrigerant compositions are sensitive, and compressor displace-ment is large. Distinguish between the vapor compression and vapor absorption refrigeration system. Air cooling is used for freon compressors whereas water jacketing is adopted for cooling ammonia compressors. Whereas icentropic expansion is also called Adiabatic expansion. Azeotrope is a mixture of refrigerants without phase separation. Explanation: Here p1 is the evaporator pressure and p2 is the condenser pressure. This is because, Latent heat of ammonia is higher than that of freon, Thermal conductivity of water is higher than that of air, Specific heat of water is higher than that of air. Compression. Title: Food Transport Refrigeration with Engine Exhaust and Metal Hydride Reactors. This, between the condenser and evaporator is known as, Chapter-3 Vapour Absorption Refrigeration system (Coming Soon ). His 1856 patent was for a vapour-compression system using ether, alcohol, or ammonia. The vapour compression refrigerator employs the following cycle 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. 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. Next we use the 1st Law to eliminate Wref from the equation. 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 dry bulb … Compression horsepower 42.41 Btu/min - hp Ne t refrigerating Effe ct, Btu/lb He at of comp ression, Bt u/lb 200 4 2.41 = 4 .716 X X X X X X X X R eference: F luo rocarbon R efrigerants H andbook E nthalpy (Btu /lb) R-134a e r u s s e r P (a i p) 4 5. How is the condensation process in vapour compression refrigeration cycle carried out? (C) employing a heat exchanger Multiple Choice Questions (MCQ) and Answers on Chemical Engineering Thermodynamics Question 1 : The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. Saturation pressure – temperature relationship. 15. This mock test of Vapour Compression Systems, Refrigerants - MCQ Test 2 for Mechanical Engineering helps you for every Mechanical Engineering entrance exam. As fluid flow through capillary its velocity increase as per continuity eqation (AV=const).hence conversion of pressure energy into kinetic energy takes place. Ans: b 2. In such cases, a multi-level system is used. Compound a combination of two compressors with low compression ratios can provide a high compression ratio A single refrigerant is used in the system, and the two compressors share the compression task equally. The units of _____ and COP are the same. ... Refrigeration and Air Conditioning (2161908) MCQ. Expansion. d) none of the mentioned Carbon, hydrogen and oxygen : C. Carbon, hydrogen, fluorine and chlorine: D. Carbon, fluorine and chlorine: E. Carbon and hydrogen : View Answer Workspace Report Discuss in Forum. 2.The evaporator absorbs heat from the surroundings to be cooled. a. more dangerous than the dry compression in vapour compression refrigeration system b. less dangerous than the dry compression in vapour compression refrigeration system c. equally preferable in vapour compression refrigeration system d. cannot say View Answer / Hide Answer b) high pressure ratio with dry compression gives high compressor discharge temperature The choice … (D) all of the above, Q25.The process of undercooling is generally brought about by Choices. 22 Full PDFs related to this paper. Since the rapid increasing demand on cooling, green refrigeration technology is urgent. 4. Combustion-powered compound refrigeration system . a. the mass fraction of liquid in liquid-vapour mixture of refrigerant at inlet to the evaporator, b. the mass fraction of vapour in liquid-vapour mixture of refrigerant at inlet to the evaporator, c. the mass of vapour actually compressed to the mass of vapour should have compressed ideally, ANSWER: b. the mass fraction of vapour in liquid-vapour mixture of refrigerant at inlet to the evaporator, Q5. A part of the high-pressure liquid … 8 1 1 8. Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. The work done per kg of refrigerant is reduced in, with intercooler as compared to single stage, is a device which separates liquid from vapors. Other is the major problem in vapour compression refrigeration cycle carried out system is used question. Cascade and compound compound consisting of stoms of: a Explanation: these the... Capacity at a cons moisture on refrigerant are CORRECT lowest temperature during cycle. 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