Refrigeration Plant Operator Syllabus; Book an Exam. 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. To pass you must obtain a mark of at least 65%. Ammonia has been continuously used as a refrigerant since the initial practical use of the vapor-compression refrigeration cycle was developed. Ammonia is a compound of nitrogen and hydrogen, or NH₃. Differentiate direct-expansion, gravity flooded, and liquid overfeed evaporator arrangements 4. C. 0.3785 m 3. Refrigeration And Air Conditioning MCQ question is the important chapter for a Mechanical Engineering and GATE students. Recognize materials used in halocarbon refrigeration systems that are not appropriate for use with ammonia due to material incompatibilities 3. The examination consists of one exam paper, with 70 multiple choice questions. NH3 REFRIGERATION. 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 . 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. 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). So, whether you are upgrading your refrigeration system and will exceed 10,000 lbs. In this chart, I have listed different types of material used in process piping to meet various design condition. Anhydrous ammonia is the liquid form of pure ammonia gas, technically water-free, and the substance used universally as an industrial refrigerant. Syllabus Materials. If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. 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. Newly Revised! 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. The examination consists of one exam paper, with 150 multiple choice questions. Choose the letter of the best answer in each questions. 3 Introduction The overall theme of this manual is to encourage technicians to . 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. 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. It has remained the main refrigerant used in industrial refrigeration systems because of its superior thermodynamic properties and low cost. As the heat is removed the refrigerant condenses into a liquid. B. Read on to find out how 4. 3. Now considering both process and the material property you can choose piping material from a verity of material available. To pass you must obtain a mark of at least 65%. 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. The next difference lies in the choice of piping materials. How many cubic meters is 100 gallons of liquid? 251. Multiple Choice Questions with Answers on Refrigeration and Air-Conditioning - Set 07 . So it leaves the condenser as a high pressure liquid refrigerant and flows to the receiver. The Refrigeration Piping Handbook. 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. D. … NH. In nearly all halocarbon packaged units (air-conditioning, commercial refrigeration), the refrigerant charge is critical. 0.1638 m 3. Strength of Materials Objective Questions with Answers - Set 10. A rectangular foundation cross -section has a bed plate dimension of 8 ft x 10 ft. Please note that the SOPEEC syllabus and the Pan Global study material refer to a "Refrigeration Operator ". 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 systems maintained with anhydrous ammonia are, effectively, immune to internal corrosion. As the refrigerant heats back up, it evaporates into a low-pressure gas. 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. You will be allowed 1 1/2 hours to complete the exam. It does not cover domestic or transport refrigeration. Production of raw materials Source: Pioneering Green Solutions, GF Piping Systems 2010. 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. Ammonia … Regulatory oversight on refrigerants such as CFC, HCFC, and other synthetic refrigerants, have re … Together, this means the refrigeration system uses a large amount of pure ammonia under high pressure. A. Ductile materials B. 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). 20 mm C. 24 mm D. 30 mm Ans - C 13. 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. GEA CompaX ; Model: Swept volume flow at 50 Hz / 87 Hz (m³/h) Max. The next difference lies in refrigerant management. Only the heat of the refrigerant passes through the pipe wall and is carried away by the air and water. The piping was uninsulated and was in direct contact with the hanger. You will be allowed 3 ½ hours to complete the exam. - Refrigeration Piping Handbook. When thickness of plate is 16 mm, then diameter of rivet is used in joints is... A. Anhydrous ammonia, as its name suggests, is ammonia kept separate from water. Because of Ammonia’s vaporization properties, it is frequently used as a refrigerant. 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 . 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. The refrigeration plants on merchant vessels play a vital part in carrying refrigerated cargo and provisions for the crew on board. Copper, brass, bronze cannot be used with ammonia – your metal choices are mild steels, stainless steels, nickel, but absolutely no copper. Choose the letter of the best answer in each questions. 101. THE HAZARDS OF AMMONIA 3. And the cycle begins all over again. 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. 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? of compressor required will be (a) same (b) more (c) less (d) more/less depending on rating (e) unpredictable. 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 3.7850 m 3 . This piping was supported by a pipe hanger constructed of stainless steel material. work with systems in a more environmentally-friendly manner, and to get the equipment itself to have a lower impact. Piping material broadly classified into three categories. 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. Originally printed in 2000, this publication has gone through several updates throughout the years. 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