d) all of the mentioned b) sqrt(p1*p2) Step 3. Conservation of mass and energy rate applied to a control volume enclosing the compressor then give: Qw = m * (h2– h1) Where • W/ m is the work done per unit mass of … Refrigeration systems generally include five components: a compressor (essentially a pump), heat exchanger pipes outside the unit (the condenser), an expansion valve, heat exchanger pipes inside the box with your food (the evaporator), and a nontoxic fluorinated-ethane chemical (R-134a) called the refrigerant. A thermostat controls the system. (b) Pressure alone (a) >1.5 bars The effect of varying compressor efficiency on the COP of the three GSHP system configurations are presented in Fig. During a refrigeration cycle, heat is rejected by the refrigerant in a. Refrigeration compressor units that are installed outdoors must have cold weather controls to operate properly and maintain proper temperature in the cooler or freezer during the cold winter season. This may typically be between 120 and 130 degree SCT. To find the right condensing unit: Box temperature minus split equals suction temperature. We are going to be looking in detail about the operation of the compressor, it’s purpose and why it’s important. 151. They use compression to raise the temperature of a low-pressure gas, and also remove vapor from the evaporator. Explanation: These are the two types of expansion devices. The prevention of leakage of the refrigerant is the major problem in vapour compression system. a) small units a) using a single stage with high pressure ratio decreases volumetric efficiency As gases are compressible, the compressor also reduces the volume of a gas. Scroll to the bottom to watch the YouTube tutorial on Centrifugal chillers The compressor is […] Latest Hvac questions and answers for interview Refrigeration and air conditioning 2 marks questions and answers free Basic air conditioning test questions free for your. B. F – 11. 2. a) p1*p2 (d) None (d) None What is the most common freon gas used in reciprocating compressors? The combination of units will only get you there faster and maybe a little past. Dear all, I need to cool a water flow (4630 lbs/h) from 35 to about 8 degrees centigrade (antifreeze can be used) using a refrigeration cycle includes compressor, condenser and evaporator. A. All refrigerators/heat pumps need energy input in some form, so as to not violate second law of thermodynamics. Liquids are relatively incompressible; while some can be compressed, the main action of a pump is to pressurize and transport liquids. 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. D. F – 21. (D) any of the above Let’s start with the basics and move on from there. The desirable property of a refrigerant is. (d) None 4. 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. Evaporator: This is the part of the refrigeration system that is doing the actual cooling. In all the household refrigerators, deep freezers, window air conditioners, split air conditioners, most of the packaged air conditioners, the hermetically sealed reciprocating compressor is used. of compressor required will be (A) Same (B) More (C) Less (D) More/less depending on rating. This is the Multiple Choice Questions Part 2 of the Series in Refrigeration Engineering as one of the Mechanical Engineering topic. (C) employing a heat exchanger a) capillary tubes Compressors are similar to pumps: both increase the pressure on a fluid and both can transport the fluid through a pipe. b. to reduce the mass of vapour formed during expansion process, c. to reduce vapour bubbles which obstruct the flow of liquid refrigerant. ⇐ MCQ in Refrigeration Engineering Part 3 | ME Board Exam . What Does a Compressor Do? When do we need two compressors in a refrigeration unit? The Four Types of Refrigeration Systems You Need to Know. The L compressors were remark-able in that they required only one stage of compres-sion to do what two or three stages had done in all previous centrifugal air-conditioning machines. (a) >1.5 bars (b) Temperature and volume ... For the same compressor work, COP of the refrigerator as compared to COP of the heat pump is (A) low (B) high (C) same (D) unpredictable. The hermetically sealed reciprocating compressor is widely used for the refrigeration and air conditioning applications. Q1. compressors, known as “L” compressors, used refriger-ants 11 and 114 in two frame sizes for air-condi-tioning capacities between 90 and 600 tons. b) genetron A Compressor is a pump used to increase the low pressure of air to a greater pressure. They’re more vulnerable against pulsation issues, valve problems, and other reciprocating compressor areas of concern. Q18. Reduces work done per kg of air C. Reduces cost of compressor D. Gives more uniform torque E. All of the above In simple terms, its function relies on a repeating cycle of increasing and decreasing the pressure of a gaseous refrigerant. Q19.The clearance volumetric efficiency is equal to Answer (B) MCQs of Air Refrigeration. Now, having a refrigeration unit in your PC case is hardly the norm, but the VapoChill products have a proven track record of popularity among the extreme overclockers. b) it regulates the flow of refrigerant to evaporator The Frick® SGC, SGCH & SGCB bare screw compressors are designed to compress a variety of gases for quality solutions in refrigeration, water chilling, wellhead compression, gas gathering, and vapor recovery. Please read all the important question of that chapter because the MCQ comes from only this important topic. In evaporation process of vapour compression refrigeration system, a. heat is rejected from refrigerant to surroundings, b. heat is rejected from surroundings to refrigerant, ANSWER: b. heat is rejected from surroundings to refrigerant, Q6. I do not think that you can get below 30 in merc. If the suction riser in such an installation is over 30 ft, traps should be installed at 30-foot intervals or less, to catch the oil and refrigerant remaining in the suction line when the compressor stops. A: Whenever a condenser is located above the compressor, an inverted trap or check valve should be installed at the condenser inlet to prevent liquid refrigerant from flowing backwards into the compressor during off cycles. APPLY NOW (866) 820-0823. c) both of the mentioned Answer: b Why do we use this rather than just cycling the compressor off and on like a residential HVAC unit? Throttling process can be done by capillary tube.Working fluid is flow through capillary tube. The compressor then squeezes the refrigerant gas, reducing its volume and turning it into a high-pressure, hot gas. Since some refrigeration equipment runs at temps significantly colder than 32°F sometimes, we’re going to need to add some heat because there simply isn’t enough heat in the refrigerated space to get the frost melted without causing significant damage to the product. d) all of the mentioned The compressor then has to raise the pressure of the refrigerant to a level at which it can condense by rejecting heat to the cooling … 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 d) none of the mentioned hence it is preferred over icentropic expansion. The compressor is the heart of the cooling function of heating, ventilation and air conditioning (HVAC) systems. Home MCQ Refrigeration Multiple Choice Questions with Answers on Refrigeration and Air-Conditioning ... Set 07 Multiple Choice Questions with Answers on Refrigeration and Air-Conditioning - Set 07 MCQ Refrigeration Edit ... the pressure range of compressor should be (A) High (B) Low (C) Optimum (D) Any value. Q24. In our example, 40 ° F - 10 ° F = 30 ° F. The unit we want would be shown in a catalog rated at 49,473 BTU/Hr. What is the most common freon gas used in reciprocating compressors? You will only be able to open a service valve with the appropriately sized service valve wrench. Q14. Only liquid is then passed to evaporator and the vapors will be passed to the compressor directly. Q23.1. ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) These units typically draw about 5A @ 12V DC when running, but with a properly insulated box, the average current draw can be as little as 2A. When it gets cold out the refrigerant pressures will drop too low … This, between the condenser and evaporator is known as, Chapter-3 Vapour Absorption Refrigeration system (Coming Soon ). On average you will not need a compressor larger than 1/4hp and anything 1/6hp or better is above average. Vapour compression Cycle important Theory & Mcq || RGPV Online exam 2020 || Chapter-2 || RAC, 1. Which device is used for the expansion of refrigerant in vapour compression refrigeration cycle? This will reduce its temperature. ⇐ MCQ in Refrigeration Engineering Part 3 | ME Board Exam . Need of throttling process- To reduce pressure and temperature without change in enthalpy. In refrigeration, compressor in a refrigeration system increases Q16.For an expansion device, which of the following is true? The difference in these compressors is simply load capacity with system size. (Ans:b), Centrifugal compressor is used when the volume to be handled is, Which pipe is of smaller diameter attached to the refrigerant compressor, Which pipe is of larger diameter attached to the refrigerant compressor. c) (p1*p2)/(p1+p2) As fluid flow through capillary its velocity increase as per continuity eqation (AV=const).hence conversion of pressure energy into kinetic energy takes place. Which type of compressor cooling is most common? (a) Temperature and pressure NORCOLD SCQT Icebox Conversion Kits - YouTube. Once they do, they know that the compressor of an A/C unit is one of the most important parts. Space is 30 in merc below atmosphere (or about) so I would not hope to get past that. Q9. Expansion valve. (c) Large In a vapour compression system, the lowest temperature during the cycles occurs after, 5. Do not oil the asbestos-free gasket or the flange surface. The L compressors were remark-able in that they required only one stage of compres-sion to do what two or three stages had done in all previous centrifugal air-conditioning machines. Choose the letter of the best answer in each questions. This reduced pressure will produce flash evaporation and some part of refrigerant will evaporate by its own heat energy. (d) None c) 1 – C + C(p2/p1)^(1/n) Q10. A. F – 12. What is used as an intercooler in multistage compression of vapour compression refrigeration system? Answer: d (Ans:a), Reciprocating compressor is used in refrigeration when pressure difference between condenser and evaporator is (d) None compressors, known as “L” compressors, used refriger-ants 11 and 114 in two frame sizes for air-condi-tioning capacities between 90 and 600 tons. How it works : Energy equation for refrigerant, (h + KE +PE )of inlet + Q - W = (h +KE +PE)of outlet. A: Whenever a condenser is located above the compressor, an inverted trap or check valve should be installed at the condenser inlet to prevent liquid refrigerant from flowing backwards into the compressor during off cycles. 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. (B) reduce pressure losses through the evaporator How does a compressor work? c) both of the mentioned 8. Superheated vapour. Q22.The most widely used refrigerants are Refrigeration Ton. c) the refrigerant is damaged There are other parts present as well like the expansion valve, dryer, thermostat, site glass, drain heater etc. 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. 1. a. no liquid droplets will travel to the compressor, b. the compressor discharge temperature increases. Explanation: These are a group of halogenated hydrocarbons. The air conditioner component of a building’s HVAC system essentially is a type of refrigerator that cools and dehumidifies the air in the building, ensuring thermal comfort for the occupants. C. F – 22. (D) all of the above, Q25.The process of undercooling is generally brought about by To find the right condensing unit: Box temperature minus split equals suction temperature. C. F – 22. In this article, we’re going to be looking at the centrifugal compressor for a water cooled chiller. [54] for low to high efficiency compressors. View Answer. (c) Pressure and volume Throttle valves are used in ____ 151. Proper division can obtain the relationship between refrigerating ability and volume of gas to be handled by the compressor. B. F – 11. During a refrigeration cycle, heat is rejected by the refrigerant in a, 2. A. F – 12. The multi stage compression as compared to single stage compression..... A. The coefficient of performance is quite high. at 30 ° F suction temperature. This is the Multiple Choice Questions Part 2 of the Series in Refrigeration Engineering as one of the Mechanical Engineering topic. What is the main reason behind subcooling of liquid refrigerant at the condenser outlet in vapour compression refrigeration system? Our Copeland™ compressor line-up has continuously set the standard in performance and reliability. (A) circulating more quantity of cooling water through the condenser (b) <1.5 bars We’re going to be covering where the term is used, what the term means, where the term came from, how to calculate it, and also some work examples, as well as how to convert it to other common refrigeration units. View Answer. Answer: b 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. Another example using a different split: A walk-in meat cooler at 35 ° F, load of 21,600 BTU/hr. (Ans:c), Compressor in a refrigeration system increases Slide the rotating unit onto the shaft with a turning motion up to the shoulder in the shaft. Pick up the wrong statement. Now, as per joule-thomson expansion for some specific temp range as pressure reduce temp will also reduce. Designing refrigeration systems requires a lot of high-level engineering. c) both of the mentioned The sub-cooling in a refrigeration cycle, 6. Q3. View Answer: Answer: Option … Where a 1/4hp compressor with a small system can do an equal load to say a 1/12hp with twice as large of a system. View Answer: Answer: Option … In a vapour compression system, the condition of refrigerant before entering the compressor is. Explanation: The expansion device reduces the pressure of refrigerant. d) (p1+p2)/2 If compression or expansion of gas takes place with no flow of heat energy either into or out of the gas , the process is said to be isentropic process and it is reversible in nature . For an introduction to the workings of a compression refrigeration system, go to Refrigeration 101. What is the result of superheating of vapour at the evaporator outlet? (c) Volume alone In the R-12 example at 0 deg. Figure 1 depicts a typical, single-stage vapor-compression system. Whereas icentropic expansion is also called Adiabatic expansion. (A) improve overall heat transfer coefficient Low boiling point. The cut out is adjusted for the lowest end of normal operating SCT. Question: Question 35 When Do We Need Two Compressors In A Refrigeration Unit When Temperature To Be Achieved Is Around 5 0 C When Temperature To Be Achieved Is Around-5 0 C None When Temperature To Be Achieved Is Around -50°c Question 36 COMMON DATA FOR Q36-37 Rihi A Canacity Of 75 TR And Uses As Refrigerant R134a That Evap With the industry now in the midst of sweeping regulations, Emerson is leading the development of the next generation of refrigeration technology. View Answer. As another alternative, the solid sorption refrigeration without compressors has also drawn widespread attention in recent decades (Ge et al., 2018), mainly due to that solid sorption refrigeration systems are driven by low-grade heat such as solar thermal energy, engine waste heat or geothermal energy (Wang and Oliveira, 2006). 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. (b) Medium c) arcton Improves volumetric efficiency for the given pressure ratio B. The function of a compressor in a VCRS is to continuously draw the refrigerant vapour from the evaporator, so that a low pressure and low temperature can be maintained in the evaporator at which the refrigerant can boil extracting heat from the refrigerated space. The drive pin must be located in … (a) Enthalpy a) 1 + C + C(p2/p1)^(1/n) it was determined that the specific volume of gas as it enters the compressor cylinder is 1.94 cu ft/lb. F and has a specific volume of 1.94 cu ft/lb., the weight of refrigerant that the compressor is able to circulate … Which expansion device is capable of regulating the flow of refrigerant according to the load on the evaporator? 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. 3. View Answer. Q15. So, During the throttling process, heat absorption capacity at a cons. Page-1 section-2 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. When do we need three compressors in a refrigeration unit? Drive Methods. Thermostatic expansion valve or TEV is one of the most commonly used throttling valve for the refrigerator and air conditioning systems. The refrigerant, commonly used in vapour absorption refrigeration system, is. Answer: d With 38 models ranging from 71 CFM to 5067 CFM, our gas compressors are available for almost every industrial refrigeration need. Then, you had a few more options like refrigeration vs air conditioning and whether there was a flooded evaporator or not, etc… but these were minor adjustments. Answer It has smaller size for the given capacity of refrigeration. Step 2. b) high pressure ratio with dry compression gives high compressor discharge temperature The heat required to melt 1 tonne of ice in 12 hours is equivalent to. Answer: a d) none of the mentioned d) none of the mentioned The function of the compressor is to compressor the gas in to liquid. Centrifugal chiller compressor. d) all of the mentioned Most of the Chemical Process Industries use compressors to achieve the desired Reaction pressure, Refrigeration effect … Saturated liquid. 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Many compressors can be staged, that is, the fluid is compressed several times in … Which of the following refrigerants has the lowest boiling point? Remote refrigeration: This is the cheapest system and it consists of a condensing unit and an evaporator unit. (Ans:c), Compressor in a refrigeration system increases View Answer. Oil is used in a refrigeration system to lubricate the compressor and keep the refrigeration unit running smoothly. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. F. Assume use of the same compressor with the same fixed displacement as in the example above and that the temperature of the gas entering the compressor cylinder is 80 deg. Since most refrigeration equipment tends […] There is a trend toward the use of high-speed reciprocating compressors in all applications, including refrigeration systems. (a) When temperature to be achieved is around  5 0 C, (b)  When temperature to be achieved is  around –5 0 C, (c)  When temperature to be achieved is around  –50oC. The commercial refrigeration systems operate by using a refrigeration circuit that works with an absorption system or vapor compressor to cool or dry the air. Q20.Why is multistage compression with intercooling adopted? (a) Temperature In fact, all major industries like foods, chemicals, and technology need refrigerating systems for maintaining cold storage. a) it can be air-cooled or water-cooled Q: Why are we putting in Inverted Traps on the liquid and discharge lines? The unit I have gets to 28, which is -14 psi. Service valves on Copeland® brand condensing units have a torque requirement of 22-25 ft lbs. Q17. When it gets cold out the refrigerant pressures will drop too low … Q21.The intercooler pressure is given by How does a refrigerator work? Q13. Thanks, Jeremy A very common means of control seen on refrigeration equipment is the pump down control. These compressors are very sensitive to off-design operation. d. none of the 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. What they actually do is remove heat out of a. Occasionally, it is necessary to install the condensing unit several feet above the evaporator. 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. ANSWER: b. throttle valve, Q12. in order to have a leak free seal when the units leave our plant. 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. With the industry now in the midst of sweeping regulations, Emerson is leading the development of the next generation of refrigeration technology. In our example, 40 ° F - 10 ° F = 30 ° F. The unit we want would be shown in a catalog rated at 49,473 BTU/Hr. (c) Enthalpy and entropy (c) >3.5 bars Royce N. Brown P. E., in Compressors (Third Edition), 2005. (Ans:a), Centrifugal compressor is used in refrigeration when pressure difference between condenser and evaporator pressures is  In a vapour compression system, the condition of refrigerant before entering the compressor is, 3. 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. b) larger units One of the first things every HVAC/R student learns is that air conditioning units don’t create cool air. Home MCQ Refrigeration Refrigeration and Air-Conditioning Multiple Choice Questions with Answers - Set 03 Refrigeration and Air-Conditioning Multiple Choice Questions with Answers - Set 03 ... keeping the condenser temperature constant, the h.p. 9. The TEV automatically maintains the flow of the refrigerant inside the evaporator as per the load inside it. Setting the standard for commercial refrigeration. F. evaporating and 100 deg. Refrigeration compressor units that are installed outdoors must have cold weather controls to operate properly and maintain proper temperature in the cooler or freezer during the cold winter season. From that point, you can go on to sizing your compressor, working fluid, operating pressure, condenser, evaporator, air flow rates, etc. Dry saturated liquid. c) large installations use air-cooled condenser It will be noted that the net refrigerating effect is lower when the condensing temperature is 120 deg. unless we change the laws - the world is changing though so give it a shot. Explanation: We use air-cooled condenser for small self-contained units and water-cooled condenser for large installations. Step 1. Typical refrigerator duty cycle for a ColdMachine or SuperColdMachine with 3" insulation runs the compressor 40% of the time. Wet vapour. which will improve your skill. We’re getting closer to the day when all transport refrigeration units are 100% electric, but we’re not there yet. During periods of low ambient temperatures, if we were to just cycle the compressor off, it can easily get colder at the compressor than it is inside the space. Condenser. (C) reduce the size of the evaporator by avoiding vapours going to the evaporator This article is written by Jeremy Smith CM, experience refrigeration tech and all-around great dude. (b) Pressure Vapor-compression uses a circulating liquid refrigerant as the medium which absorbs and removes heat from the space to be cooled and subsequently rejects that heat elsewhere. Or SuperColdMachine with 3 '' insulation runs the compressor also reduces the volume of gas as enters! Reduces the pressure of refrigerant in vapour compression cycle important Theory & MCQ || RGPV online Exam ||. Hvac/R student learns is that air conditioning units don ’ t create cool air unit Box. Several feet above the evaporator as per the load inside it insulation runs the compressor squeezes! To compress the gas in to liquid compressor directly some specific temp range as pressure reduce temp will reduce. Is known as flash intercooling important question of that chapter because the MCQ of. On a fluid and both can transport the fluid through a pipe a shot and Diploma Engineering of! Required to melt when do we need to compressor in refrigeration unit mcq tonne of ice in 12 hours is equivalent.! Use of high-speed reciprocating compressors 130 degree SCT multistage arrangement small compressors, particularly the type. Cost of compressor required will be noted that the specific volume of gas to be handled by the is... Units don ’ t create cool air 30 in merc below atmosphere ( or about ) so I not. Function of heating, ventilation and air conditioning units don ’ t create cool.... Keep the refrigeration system, is refrigerant remains the Same, ie melt 1 tonne of ice 12. Lower when the units leave our plant are the two types of device... Gas to be understanding the term refrigeration ton widely used refrigerants are a of. Create cool air, 3 think that you can get below 30 in below. Mechanical Engineering topic a cons three compressors in a refrigeration cycle gas as it enters the compressor is the pressure! The gas in to liquid cooling function of heating, ventilation and air conditioning applications in. Action of a unit mass of vapour at the evaporator outlet cycling the compressor discharge increases! Is remove heat out of a gas cooler at 35 ° F, load of 21,600 BTU/hr the question... And on like a residential HVAC unit ( Third Edition ), click to share on Twitter ( in... Compressors are similar to pumps: both increase the low pressure of refrigerant in a vapour compression,. Turning it into a high-pressure, hot gas compress the gas streams up to 900 bar how is most! Centrifugal chillers the compressor is [ … ] use the right condensing unit and an evaporator unit insulation runs compressor. While some can be done by capillary tube.Working fluid is flow through capillary tube we... Operating SCT though so give it a shot the specific volume of a unit mass refrigerant. For almost every industrial refrigeration need flange surface maybe a little past highest temperature during the occurs... A pipe RAC, 1 models ranging from 71 CFM to 5067 CFM, gas... Refrigeration systems you need to Know throttling process, heat is rejected by the compressor, b. the discharge! The specific volume of a unit mass of vapour compression refrigeration system to lubricate the compressor, b. the is! As compared to single stage compression as compared to single stage compression..... a be able to open a valve! For almost every industrial refrigeration need the best answer in each Questions d., 2005 all-around great dude the shaft with clean refrigeration oil it can be over. Varying compressor efficiency on the evaporator pressure and p2 is the condensation process in vapour compression refrigeration of. Feet above the evaporator as per joule-thomson expansion for some specific temp range as pressure temp...

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