Throttle valves are used in ____ What is used as an intercooler in multistage compression of vapour compression refrigeration system? Refrigeration and air conditioning mcq questions converted 1. What is the main reason behind subcooling of liquid refrigerant at the condenser outlet in vapour compression refrigeration system? The cylinders in compound compressor distinguished as low-pressure cylinder and high-pressure cylinder. low compression ratio and relatively high volumetric efficiency. The most common refrigeration system in use for refrigerated food transport applications today is the vapour compression system. In a vapour compression system, the lowest temperature during the cycles occurs after, 5. This test is Rated positive by 90% students preparing for Mechanical Engineering.This MCQ test is related to Mechanical Engineering syllabus, prepared by Mechanical Engineering teachers. The work done per kg of refrigerant is reduced in compound compression with intercooler as compared to single stage compression for the same delivery pressure. The refrigerant, commonly used in vapour absorption refrigeration system, is. c) arcton However, it is preferred in comfort air-conditioning. This arrangement provides the means for cooling of fluid between stages, and thus compression work is reduced. Q23.1. Then the heating capacity of heat pump is, nearly. Answer: b Components Of Refrigeration Systems. As can be seen, the liquid leaving the condenser is cooled by passing through the throttle valve, where the pressure drops, resulting in partial vaporisation of the refrigerant and a significant reduction in temperature. 4.The amount of heat exchanged in condenser and evaporator are equal under steady conditions. 5.8. Q19.The clearance volumetric efficiency is equal to There are two main types; cascade and compound. Condensation. hence it is preferred over icentropic expansion. Enhancement of vapour compression refrigeration system (VCR) performance using greenhouse gas mixtures Saikesh Erramshettya#Barmavatu Praveenb* Venkata Manikanta Ankema Yesu Raju Uppea aMaster's in Renewable Energy Systems, Hochschule Nordhausen - University of Applied Sciences, Nordhausen, Germany-99734. Pick up the wrong statement. 4. c. either throttling valve or capillary tube, ANSWER: c. either throttling valve or capillary tube, 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, ANSWER: a. more dangerous than the dry compression in vapour compression refrigeration system. Which of the following statement is true for a condenser? In a vapour compression system, the condition of refrigerant before entering the compressor is. It has smaller size for the given capacity of refrigeration. b) small self-contained units use water-cooled condenser 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. Superheated vapour. EduRev is a knowledge-sharing community that depends on everyone being able to pitch in when they know something. Which of the above statements are correct? Vapour Compression Refrigeration System: Analysis of simple vapour compression Refrigeration cycle by p-h and T-S diagram. Download app for fast access + Download from play store Add to Bookmark All Engineering + … In a refrigeration cycle, the desired output is Q C, because the goal is to remove heat from the cold reservoir. Since for isentropic compression process. As the evaporator temperature lowers down, the required compression ratio, a. becomes lower for a given condensation temperature, b. becomes higher for a given condensation temperature, c. becomes steady for a given condensation temperature, ANSWER: b. becomes higher for a given condensation temperature. Which of the following is a type of expansion device? Ans: a. r. o. Download. The color of the flame of halide torch, in a case of leakage of Freon refrigerant, will change to: A mixture of refrigerants without phase separation. 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(A) circulating more quantity of cooling water through the condenser Answer: d Saturation pressure – temperature relationship. c) large installations use air-cooled condenser d) none of the mentioned Q1. a first-stage compressor that sized to meet the cooling load, feeds into the suction of a second-stage compressor after inter-cooling of the gas. Q3. 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 … Saturated liquid. All the statements about effect of moisture on refrigerant are correct. students definitely take this Vapour Compression Systems, Refrigerants - MCQ Test 2 exercise for a better result in the exam. 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. b) throttle valves The values of enthalpy at the beginning of compression, at the end of compression and at the end of condensation are 185 kJ/kg, 210 kJ/kg and 85 kJ/kg respectively. a) using a single stage with high pressure ratio decreases volumetric efficiency Q20.Why is multistage compression with intercooling adopted? Mechanical Engineering MCQ Question Papers: DRDO, ISRO, Interview . Freon 12 is a compound consisting of stoms of: A. View Answer. Explanation: Here p1 is the evaporator pressure and p2 is the condenser pressure. The leakage in a Freon-based refrigeration system can be detected by using a/an, High condenser pressure in a refrigeration system can occur because. The refrigeration compressor in a water cooled refrigeration system is short cycling on the high pressure cutout switch. Ribas et al. 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 - ∆KE= 0 ( velocity will change but it is negligible). So, COP R = Q C over W ref. It can be employed over a large range of temperatures. His 1856 patent was for a vapour-compression system using ether, alcohol, or ammonia. Several methods are available for the detection of leaks. Q15. 2.The evaporator absorbs heat from the surroundings to be cooled. Our compressors leverage thermal technology developed through years of experience to consistently provide high quality. Abstract: Conventionally, food transport refrigeration is driven by the vehicle’s engine itself or by a diesel genset; the refrigeration cycle almost universally used is the vapour compression system (VCS), with … Refrigerant and oil are miscible at condensation pressures and temperature. The highest temperature during the cycle, in a vapour compression system, occurs after, 4. Heating, ventilation, and air conditioning (HVAC) is the technology of indoor and vehicular environmental comfort. Q9. Answer 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. Of low charge of refrigerant in the system. 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. 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