- Study guides, Class notes & Summaries

What should a service technician do if they lose their EPA certification card? - Answer-Request a new card from the certifying organization What type of synthetic oils are commonly used in new HFC systems and for retrofitting HCFC equipment to HFC refrigerants? - Answer-Polyolester Which of the following is NOT a violation of the refrigerant management regulations under the clean air act? - Answer-Servicing a system the uses CFC's or HCFC's after the phaseout of those refrigerants Wha...

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5 pages

Written in 2024/2025

Grade A+

lectknancy

Positive pressure testing of a new refrigeration system may be done: Using litmus paper. By filling the system with oxygen. By filling the system with ammonia. By filling the system with an inert gas. By filling the system with softened water. - Answer-by filling the system with an inert gas A sulphur candle is used to test for: Freon leaks Ammonia leaks Propane Vacuum seal CFC leaks - Answer-ammonia leaks Which of the following is NOT a problem asso...

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3 pages

Written in 2024/2025

Grade A+

lectknancy

Receiving Table/Area - Answer-Place in a foodservice operation where employees weigh, inspect, and check delivered items Scales - Answer-Equipment in the receiving area that employees use to weigh items in order to confirm that what was ordered matches what is delivered. Utility Carts - Answer-Wheeled equipment used in the receiving area made of durable injection molding (plastic), molded shelving, or heavy steel and used to carry food cases to storage areas. Shelving - Answer-Equipment...

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3 pages

Written in 2024/2025

Grade A+

lectknancy

Ammonia leaks may be traced with a wetted test paper treated with: a. Caustic soda b. Potassium chromate indicating liquid c. Potassium iodide-iodate d. Litmus solution e. Sulphuric acid. - Answer-D A sulphur candle is a test for what: a. Freon leaks b. Ammonia leaks c. Air leaks d. Vacuum seal e. CFC leaks. - Answer-B Before charging a system which of the following needs to be done? a. The interlocks need to be tested b. The sequence of controls must be tested c. The co...

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5 pages

Written in 2024/2025

Grade A+

lectknancy

One tone of refrigeration is: a. 13958 kJ per day b. 1000 kg of mass c. 233 kJ per minute d. 13958 J per hour - Answer-C Which of the following is NOT an advantage of a factory assembled, packaged refrigeration unit? a. Components are designed to match each other b. The final installation does not need to meet CSA B52 code c. The unit is equipped with all the required auxiliary equipment d. The unit is factory tested in operation Feedback - Answer-B A compression refrigeration...

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17 pages

Written in 2024/2025

Grade A+

lectknancy

How do you charge an R134a refrigerator with a cap tube system? - Answer-Weigh in the charge per the nameplate. What is the best thing to do before evacuating a refrigeration system? - Answer-Evacuate the gauge and pump connections to ensure all connections are tight. If a micron gauge is not working properly, what is the first thing to do to correct it? - Answer-Pour alcohol into the inlet port to clean oil out of it. In the "real world" how often is it practical to replace the oil i...

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2 pages

Written in 2024/2025

Grade A+

lectknancy

As defined in chapter 1 of this text the primary purpose of refrigeration system is - Answer-To maintain a temperature Operators must keep refrigeration systems operating safely and efficiently. Which of the following best describes the areas of required knowledge for this to be possible. - Answer-Basic physical principles, Inter-preparation of information from temperature and pressure gauges. Basic operating principles. Mechanical refrigeration is a series of steps that - Answer-moves hea...

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20 pages

Written in 2024/2025

Grade A+

lectknancy

Why must you avoid running a refrigeration system below 14 kPa when pumping down - Answer-A slightly positive system pressure is required to prevent air infiltration This safety control device used on a centrifugal compressors allows the motor to be started unloading - Answer-Vane closed switch What is the purpose of the chilled water flow switch - Answer-Protects the chiller from freezing due to lack of waterflow Where can refrigeration system log sheets be obtained from - Answer-1. Re...

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3 pages

Written in 2024/2025

Grade A+

lectknancy

How is the cooling effect in a mechanical refrigeration system produced? - Answer-Evaporation of liquid refrigerant into vapor What is the primary purpose of a compressor? - Answer-It circulates and pressurizes the refrigerant vapor before the vapor Is condensed for re use Name another function that must be performed by the compressor - Answer-Is raise the pressure and temperature of the refrigerant vapor. This allows the refrigerant to condense into a liquid as it circulates through the c...

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7 pages

Written in 2024/2025

Grade A+

lectknancy

5% - Answer-If converting from mineral oil to POE oil, what is considered to be the industry standard for residual mineral oil content? Refractometer Oil conversion test kit - Answer-When converting to POE from mineral oil, what can be used to determine residual mineral oil content? Global warming potential (GWP) - Answer-Some refrigerants are now being phased out due to their HCFC - Answer-Which currently used refrigerant category is quickly disappearing due to its ozone depletion p...

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11 pages

Written in 2024/2025

Grade A+

lectknancy

Convection is the transfer of ____ - Answer-heat through a material or substance Radiation is the ____ - Answer-projection of heat like the heat radiated by the sun or by an open flame T or F: Heat is always on the move, traveling only in one direction and always from hot to cold - Answer-false What are two methods of heat transfer? - Answer-conduction and convection What are two basic forms of refrigeration systems? - Answer-direct expansion and gravity flooded T or F: Conduction...

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11 pages

Written in 2024/2025

Grade A+

lectknancy

flash-gas - Answer-The presence of ___________ in the liquid lines reduces the efficiency of the refrigeration cycle, leads several expansion systems to work improperly and, increases superheating in vapor. A1 - Answer-According to ASHRAE refrigerant safety classification standard which designation would be the safest ? Attach DOT classification tags - Answer-When transporting cylinders containing used refrigerant, DOT requires that you ? CFC - Answer-What compound has the highest ozone...

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11 pages

Written in 2024/2025

Grade A+

lectknancy

what are the main natural types of cooling - Answer--Cooling with ice -Evaporitive cooling -Free cooling -Freezing mixtures The first principle of refrigeration is based on - Answer-laws of thermodynamics The second law of thermodynamics states that heat cannot pass from a _______ body to a _______ body without ? - Answer--cold -hot -external source of energy what are the characteristics of a conventional refrigeration cycle - Answer--Transfer of heat from a colder substance t...

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7 pages

Written in 2024/2025

Grade A+

lectknancy

CAPSTONE PREP ESCO LIGHT COMMERCIAL REFRIGERATION QUESTIONS 1. In a dry type (direct expansion) evaporator, liquid refrigerant must boil away as close to the end of the coil as possible in order to: A. Operate at high-efficiency B. Ensure that Frost is not accumulate C. Subcool the compressor D. Ensure proper oil return - CORRECT ANSWER -A. Operate at high-efficiency 2. The difference between the temperature of the refrigerant boiling in the evaporator and the temperature at the e...

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26 pages

Written in 2023/2024

Grade A+

cappaberryjohn