Multiple Choice Questions with Answers on Refrigeration and Air-Conditioning - Set 07 . 12 mm B. Now considering both process and the material property you can choose piping material from a verity of material available. The most important physical properties of anhydrous ammonia are: Molecular Symbol . Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. NH3 boils at −33.34 °C (−28.012 °F) at a pressure of one atmosphere, Ammonia was commonly used before Freons (chlorofluorocarbons) became popular. Refrigeration Plant Operator Syllabus; Book an Exam. The examination consists of one exam paper, with 150 multiple choice questions. The following sources of information on anhydrous ammonia are recommended. work with systems in a more environmentally-friendly manner, and to get the equipment itself to have a lower impact. The refrigeration plants on merchant vessels play a vital part in carrying refrigerated cargo and provisions for the crew on board. Which of the following joint is permanent types joints ? as such, the material within this manual may contribute towards those elements that address refrigerant use and handling. As the refrigerant heats back up, it evaporates into a low-pressure gas. of compressor required will be (a) same (b) more (c) less (d) more/less depending on rating (e) unpredictable. It does not cover domestic or transport refrigeration. When the cold liquid refrigerant reaches the evaporator (the interface between the return chilled water and the refrigerant loop) it absorbs the heat from the return water, which occurs because at this point the refrigerant temperature is lower than that of the return water. Anhydrous ammonia, as its name suggests, is ammonia kept separate from water. Ammonia is a compound of nitrogen and hydrogen, or NH₃. Ammonia … The piping was uninsulated and was in direct contact with the hanger. Choose the letter of the best answer in each questions. Food processing/ production : 1: Ammonia exposure: 5-Nov-14: A chemical analysis report indicated ammonia was present in the system's brine solution. If materials to be used in the process are corrosive then this should be taken into account in the plant design and layout. It has remained the main refrigerant used in industrial refrigeration systems because of its superior thermodynamic properties and low cost. Production of raw materials Source: Pioneering Green Solutions, GF Piping Systems 2010. Choose the letter of the best answer in each questions. MCQ in Industrial Plant Design; MCQ in Refrigeration Engineering and its Applications ; MCQ in Air Conditioning; Continue Practice Exam Test Questions Part 6 of the Series ⇐ MCQ in Power Plant Engineering Part 5 | ME Board Exam . The advantages of ammonia when compared to R404A are cost, heat transfer coefficient, plant pipes size, behavior in presence of water, leakage detection, environmental compatibility: Cost: The current cost per kilogram anhydrous ammonia for refrigeration systems is several times lower than that of R404A. So it leaves the condenser as a high pressure liquid refrigerant and flows to the receiver. A. To pass you must obtain a mark of at least 65%. In this chart, I have listed different types of material used in process piping to meet various design condition. Why you need this Manual. 3. Because oil used in refrigeration systems is designed to easily mix with the refrigerant, and oil traps are not 100 percent effective, some oil carryover will occur. And the cycle begins all over again. 3.7850 m 3 . A. Ductile materials B. 20 mm C. 24 mm D. 30 mm Ans - C 13. B. Cold Block Piping Solutions ; Cold Block Process Units ... GEA RT Select – our selection and configuration program will help you to find the right equipment for your refrigeration and heating plant. Newly Revised! OF USING ANHYDROUS AMMONIA REFRIGERANT IN THE PROCESS INDUSTRIES Walter S. Kessler, Senior Process Safety Engineer Introduction: Ammonia (azane (1) or R-717) was among the early refrigerants, first used in 1850 in France(2). Because of Ammonia’s vaporization properties, it is frequently used as a refrigerant. In reefer ships, the temperature of the perishable or temperature sensitive cargo such as food, chemical, or liquefied gas, is controlled by the refrigeration plant of the ship. Copper, brass, bronze cannot be used with ammonia – your metal choices are mild steels, stainless steels, nickel, but absolutely no copper. Suppliers must refrigerate all food and drinks once the product is made to the time it is delivered to your local HEB or Trader Joe’s. Any water in the system would freeze and obstruct piping, so ammonia refrigeration systems must use anhydrous ammonia (without water or other impurities). To pass you must obtain a mark of at least 65%. Only the heat of the refrigerant passes through the pipe wall and is carried away by the air and water. This code prescribes minimum requirements for the design, materials, fabrication, erection, test, and inspection of power and auxiliary service piping systems for electric generation stations, industrial institutional plants, central and district heating plants. This piping was supported by a pipe hanger constructed of stainless steel material. Originally printed in 2000, this publication has gone through several updates throughout the years. MCQ in Industrial Plant Design; MCQ in Refrigeration Engineering and its Applications; MCQ in Air Conditioning; Continue Practice Exam Test Questions Part 3 of the Series ⇐ MCQ in Power Plant Engineering Part 2 | ME Board Exam . The IIAR (International Institute of Ammonia Refrigeration), in conjunction with ANSI, issues guidelines for identification of ammonia lines. Ammonia has been continuously used as a refrigerant since the initial practical use of the vapor-compression refrigeration cycle was developed. Read more. How many cubic meters is 100 gallons of liquid? Practice Test: Question Set - 07 1. Syllabus Materials. The next difference lies in refrigerant management. Metal, Nonmetal, and composite, which is a combination of metal to metal or metal to non-metal. So, whether you are upgrading your refrigeration system and will exceed 10,000 lbs. When your facility has 10,000 pounds or more of Anhydrous Ammonia on its property, or if you are modifying a smaller system that will put you over the 10,000 pound Threshold Quantity. The receiver is a storage vessel for a reservoir of liquid refrigerant and holds any excess that’s not in use. Piping material broadly classified into three categories. It was then utilized in the US in the 1860s for artificial ice production and then the first ammonia refrigeration machines were patented in the 1870s. With molecules consisting of 1 atom of nitrogen to 3 atoms of hydrogen, anhydrous ammonia is used as an agricultural fertilizer to recharge the soil with nitrogen depleted by crops, as well as a desiccant to slow mold growth in high-moisture grains and a protein enriched of corn silage. NH. Differentiate direct-expansion, gravity flooded, and liquid overfeed evaporator arrangements 4. A guide to modern refrigeration piping – this book is a comprehensive introduction to refrigeration piping as it is practiced in the field. Regulatory oversight on refrigerants such as CFC, HCFC, and other synthetic refrigerants, have re … The physics of vapor-compression refrigeration require the system to use enough pressure to compress the gas into a liquid. 251. 4 The fast, sturdy and efficient joining GF Piping Systems has invested considerably in developing the ideal joining technologies for special appli-cations and materials. Materials of construction should be carefully selected, protected where possible and regularly inspected if the presence of corrosive materials or a corrosive environment is anticipated. As the heat is removed the refrigerant condenses into a liquid. GEA CompaX ; Model: Swept volume flow at 50 Hz / 87 Hz (m³/h) Max. Recognize materials used in halocarbon refrigeration systems that are not appropriate for use with ammonia due to material incompatibilities 3. In nearly all halocarbon packaged units (air-conditioning, commercial refrigeration), the refrigerant charge is critical. The next difference lies in the choice of piping materials. 3 Introduction The overall theme of this manual is to encourage technicians to . If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. A. When thickness of plate is 16 mm, then diameter of rivet is used in joints is... A. There is a publication: Bulletin 114 - Guidelines for: Identification of Ammonia Refrigeration Piping and System Components (Date: 1991) Member Price: $10.00 Non-member Price: $20.00 commercial refrigeration plant in the food and drinks industry and is relevant for applications in other workplaces, for example ice-rinks and the petro-chemical industry. The Refrigeration Piping Handbook. You will be allowed 1 1/2 hours to complete the exam. In ammonia refrigeration plants, piping and vessels can be exposed to multiple environments and conditions that result in varying levels of mechanical integrity (MI) risks or failure mechanisms. Ever wonder how your local grocery store keeps all their produce, meats, drinks, and bread fresh by the time it gets distributed for your weekly grocery run? This lowers the normal flammability limit of anhydrous ammonia (16 percent to 25 percent by volume in air) because it is now a mixture of oil and ammonia. To check available dates or to book a Refrigeration Plant Operator exam see the Exam Calendar. Aqua ammonia is used as refrigerant in the following type of refrigeration system (a) compression (b) direct (c) indirect (d) absorption (e) none of the above. Although liquefied ammonia had been used without significant difficulties for several decades in the refrigeration, chemical and steel heat-treating industries, inexplicable ruptures of ammonia containers in the agricultural service occurred soon after the introduction of ammonia into this service. 101. C. 0.3785 m 3. The examination consists of one exam paper, with 70 multiple choice questions. Hard materials C. Brittle materials D. Low density materials Ans - A 12. Syllabus Materials. Anhydrous ammonia is the liquid form of pure ammonia gas, technically water-free, and the substance used universally as an industrial refrigerant. 0.1638 m 3. You will be allowed 3 ½ hours to complete the exam. NH3 REFRIGERATION. Pamphlet G-2, Anhydrous Ammonia Compressed Gas Association Phone 703-412-0900 1725 Jefferson Davis Highway Arlington, VA 22202 Storage and Handling of Anhydrous Ammonia 29 CFR 1910.111 Code of Federal Regulations, Title 29-Labor Pamphlet ANSI K61.1 Read on to find out how 4. Ans: d 60. THE HAZARDS OF AMMONIA 3. 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. D. … Together, this means the refrigeration system uses a large amount of pure ammonia under high pressure. A rectangular foundation cross -section has a bed plate dimension of 8 ft x 10 ft. refrigeration systems maintained with anhydrous ammonia are, effectively, immune to internal corrosion. With the COOL-FIT ABS Plus nipple, no peeling of the polyurethane insulation or subsequent insulating on site is required. Please note that the SOPEEC syllabus and the Pan Global study material refer to a "Refrigeration Operator ". A PSM is required when your facility has 10,000 pounds or more of anhydrous ammonia on its property or if you are modifying a smaller system that will put you over the 10,000-pound threshold (for example, if you’re upgrading your refrigeration system and it will exceed 10,000 pounds or if you’re building a new facility that will exceed the 10,000-pound threshold quantity). - Refrigeration Piping Handbook. Strength of Materials Objective Questions with Answers - Set 10. Any excess that ’ s not in use 24 mm D. 30 mm Ans - C 13 refrigeration! 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