a) 1 + C + C(p2/p1)^(1/n) Q15. (b) Medium (c) Volume alone Which of the following statement is true for a condenser? In fact, all major industries like foods, chemicals, and technology need refrigerating systems for maintaining cold storage. One of the first things every HVAC/R student learns is that air conditioning units don’t create cool air. The multi stage compression as compared to single stage compression..... A. B. F – 11. Air trapped in a refrigeration system using a water-cooled condenser is usually indicated by a] unusually high head pressure when compared to the existing temperature of the liquid refrigerant b] higher than normal liquid level in the receiver Q3. The drive pin must be located in … (b) Entropy Q19.The clearance volumetric efficiency is equal to (a) Enthalpy How is the condensation process in vapour compression refrigeration cycle carried out? d) 1 + C – C(p2/p1)^(1/n) (c) >3.5 bars b) sqrt(p1*p2) c) both of the mentioned In simple terms, its function relies on a repeating cycle of increasing and decreasing the pressure of a gaseous refrigerant. Answer: b Whereas icentropic expansion is also called Adiabatic expansion. What is the most common freon gas used in reciprocating compressors? Ans: b 2. What they actually do is remove heat out of a. 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. a) it can be air-cooled or water-cooled Answer (a) Temperature 4. (c) Large in order to have a leak free seal when the units leave our plant. Step 3. Explanation: Here p1 is the evaporator pressure and p2 is the condenser pressure. (A) circulating more quantity of cooling water through the condenser 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. d. none of the above In a vapour compression system, the condition of refrigerant before entering the compressor is, 3. The combination of units will only get you there faster and maybe a little past. During a refrigeration cycle, heat is rejected by the refrigerant in a, 2. Compressor. (c) >3.5 bars 01) full size refrigerator: compressor probably about 1/8 - 1/6hp 02) full size refrigerator freezer combo: compressor typically 1/6 - 1/3hp 03) chest freezer: compressor typically 1/4 - 1/2hp 04) full size freezer: compressor typically 1/5 - 1/3hp 05) mini fridge: compressor range 1/20 - 1/8hp 06) mini freezer: compressor range 1/10 - 1-6hp When do we need two compressors in a refrigeration unit? F. evaporating and 100 deg. The Four Types of Refrigeration Systems You Need to Know. Evaporator. ASWDC (App, Software & Website Development Center) Darshan Institute of Engineering & Technology (DIET) (b) Pressure alone (b) Pressure Low boiling point. The sub-cooling in a refrigeration cycle, 6. c) both of the mentioned c) both of the mentioned Thanks, Jeremy A very common means of control seen on refrigeration equipment is the pump down control. Improves volumetric efficiency for the given pressure ratio B. Royce N. Brown P. E., in Compressors (Third Edition), 2005. Pick up the wrong statement. 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. Q10. The unit I have gets to 28, which is -14 psi. Drive Methods. When it gets cold out the refrigerant pressures will drop too low … The effect of varying compressor efficiency on the COP of the three GSHP system configurations are presented in Fig. 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. Liquids are relatively incompressible; while some can be compressed, the main action of a pump is to pressurize and transport liquids. With the industry now in the midst of sweeping regulations, Emerson is leading the development of the next generation of refrigeration technology. d) none of the mentioned (D) all of the above, Q25.The process of undercooling is generally brought about by Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. (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. A. F – 12. 9. ⇐ MCQ in Refrigeration Engineering Part 3 | ME Board Exam . 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. View Answer. 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. The prevention of leakage of the refrigerant is the major problem in vapour compression system. Expansion valve. These guidelines are intended for use by operators of R134a Frigomatic systems in the USA, & laws covering the use of HFC refrigerants may vary in other parts of the world. Only liquid is then passed to evaporator and the vapors will be passed to the compressor directly. Another feature of reciprocating compressors that is somewhat unique when compared to the rest of the compressor family is the number of available drive arrangements, which are almost as complex as the cylinder arrangements. 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. 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 The purpose of installing a flash chamber in the refrigeration circuit is to When it gets cold out the refrigerant pressures will drop too low … So, During the throttling process, heat absorption capacity at a cons. a) capillary tubes (Ans:c), Compressor in a refrigeration system increases Answer: d a. throttling valve b. capillary tube c. either throttling valve or capillary tube d. none of the above View Answer / Hide Answer D. F – 21. How does a refrigerator work? The adjustable fan cycling control is set to cut in at the high end of your normal saturated condenser temperature (SCT). b) it regulates the flow of refrigerant to evaporator Mechanical Engineering Refrigeration and Air Conditioning Important MCQ 1. Throttle valves are used in ____ 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) reduce pressure losses through the evaporator To find the right condensing unit: Box temperature minus split equals suction temperature. Q20.Why is multistage compression with intercooling adopted? of compressor required will be (A) Same (B) More (C) Less (D) More/less depending on rating. ⇐ MCQ in Refrigeration Engineering Part 3 | ME Board Exam . The compressor then squeezes the refrigerant gas, reducing its volume and turning it into a high-pressure, hot gas. With the industry now in the midst of sweeping regulations, Emerson is leading the development of the next generation of refrigeration technology. A. F – 12. The desirable property of a refrigerant is. There is a trend toward the use of high-speed reciprocating compressors in all applications, including refrigeration systems. Refrigeration Ton. Choose the letter of the best answer in each questions. Need of throttling process- To reduce pressure and temperature without change in enthalpy. To find the right condensing unit: Box temperature minus split equals suction temperature. Explanation: The expansion device reduces the pressure of refrigerant. Vapour Compression Refrigeration Cycle - MCQs with Answers Q1. Explanation: We use air-cooled condenser for small self-contained units and water-cooled condenser for large installations. 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. 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. (a) Temperature and pressure C. High … We’re getting closer to the day when all transport refrigeration units are 100% electric, but we’re not there yet. C. F – 22. (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. As gases are compressible, the compressor also reduces the volume of a gas. (a) Less 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. Dry saturated liquid. High critical temperature. Explanation: These are the two types of expansion devices. 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 … (d) None b) 1 – C – C(p2/p1)^(1/n) A Compressor is a pump used to increase the low pressure of air to a greater pressure. High-speed compressors. Once they do, they know that the compressor of an A/C unit is one of the most important parts. (Ans:a), Reciprocating compressor is used in refrigeration when pressure difference between condenser and evaporator is Which of the following refrigerants has the lowest boiling point? 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. 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