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2024 uWise OBGYN / uWise OBGYN
Typology: Exams
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the state of the refrigerant entering the metering device is? - ✔✔✔ANSWER-A subcooled high pressure liquid. what type of refrigerant is used in VERY high-pressure appliances? - ✔✔✔ANSWER-R- what type of refrigerant is used in MEDIUM pressure appliances? - ✔✔✔ANSWER-R-
what type of refrigerant is used in HIGH pressure appliances? - ✔✔✔ANSWER-R-410A and R- what device is located at the END of the liquid line? - ✔✔✔ANSWER- The expansion device. what type of refrigerants are the LEAST harmful to the ozone layer? - ✔✔✔ANSWER-HFC refrigerants. How much money does the EPA offer to individuals who report information about others who vent refrigerants into the atmosphere? - ✔✔✔ANSWER-$10,000. which class of refrigerants does R-22 fall into? - ✔✔✔ANSWER-The HCFC class. (hydrochloroflurocarbons) which gas should be used when checking for leaks in various systems? - ✔✔✔ANSWER-Nitrogen. which term describes the process of changing a refrigerant from a liquid to a gas using HEAT? - ✔✔✔ANSWER-Latent heat. refrigerants in the SUCTION line are in what phase and state? - ✔✔✔ANSWER-Cold vapor.
what is the best way (position) to transport refrigeration cylinders? - ✔✔✔ANSWER-Upright. you can only accurately read refrigerant pressure with a stable (blank)? - ✔✔✔ANSWER-Temperature. an explosion can occur if (blank) is vented in an enclosed environment? - ✔✔✔ANSWER-Hydrogen. can refrigerants be mixed in a recovery tank? - ✔✔✔ANSWER-NO. what is the state of refrigerant leaving the liquid receiver? - ✔✔✔ANSWER-High pressure liquid. what is the minimum microns a vacuum pump must pull when evacuating a system? - ✔✔✔ANSWER-500 microns. what is usually contained in refrigerants made before 1950? - ✔✔✔ANSWER-SO2. (sulfur dioxide) what prevents transient slugs of liquid from getting into the compressor? - ✔✔✔ANSWER-Accumulator.
what is the filter drier responsible for removing? - ✔✔✔ANSWER- Moisture and Particulates. can the compressor compress liquid? - ✔✔✔ANSWER-NO. what is the best leak-checking procedure for a pressure decay test?
when was it established that you needed a certification to service, maintain, or dispose of appliances with refrigerants? This is the same date when the sale of CFCs and HCFCs were restricted to certified technicians only. - ✔✔✔ANSWER-November 14th, 1994. when did it become a violation to vent HFCs? - ✔✔✔ANSWER- November 15th, 1995. when were CFCs no longer produced? - ✔✔✔ANSWER-December 31st, 1995. section 608 of the Federal Clean Air Act requires technicians to what? - ✔✔✔ANSWER-Recover all refrigerants. the objective of the clean air act is to protect what? - ✔✔✔ANSWER- The earth's stratosphere. what does HFC (refrigerant) stand for? - ✔✔✔ANSWER-Hydro Fluoro Carbons. Hydrofluorocarbons. what does CFC (refrigerant) stand for? - ✔✔✔ANSWER-Chloro
Fluoro Carbons. Chlorofluorocarbons. what does ODP stand for? - ✔✔✔ANSWER-Ozone Depletion Potential. which international treaty agreement was the basis for section 608?
ultraviolent (UV) rays in the stratosphere layer that extends about 6 to 30 miles above earth. a single chlorine atom can destroy how many ozone molecules? - ✔✔✔ANSWER-100,000. what type of DOT tag is required for shipping refrigerant cylinders? - ✔✔✔ANSWER-DOT classification tag indicating it is a "2.2 non- flammable gas". reusable refrigerant containers under high-pressure must be hydrostatically tested how often? - ✔✔✔ANSWER-5 years. what must be done before disposing of an appliance containing CFCs or HCFCs? - ✔✔✔ANSWER-Refrigerant must be recovered. who can purchase HCFC? - ✔✔✔ANSWER-A certified technician. the smallest cylinder a 608-certified technician may purchase is (blank)? - ✔✔✔ANSWER-20lbs. in case of a major refrigerant leak, what actions should be taken? - ✔✔✔ANSWER-immediately vacate and ventilate the area or use self-contained breathing apparatus (SCBA).
the low-side test-pressure data-plate value should be used by a technician to determine a safe pressure for? - ✔✔✔ANSWER-Leak testing. what can states do in addition to the CAA? - ✔✔✔ANSWER-Enforce standards stricter than the CAA laws. what molecule found in CFCs and HCFCs deplete the ozone? - ✔✔✔ANSWER-Chlorine. what standards must refrigerant recovery equipment meet? - ✔✔✔ANSWER-Certified and labeled by an EPA approved equipment manufacturer. what is the purpose of the CAA? - ✔✔✔ANSWER-Limit how much of a pollutant can be in the air in the US. to process refrigerant to a level equal to new (virgin) product specifications as determined by chemical analysis is called what? - ✔✔✔ANSWER-Reclaiming. is R-134A a drop-in refrigerant? - ✔✔✔ANSWER-NO.
technicians who perform sealed-system service on small appliances must have what level of certification? - ✔✔✔ANSWER- Type I or Universal certification. what must be done before disposing of a small appliance containing R-12? - ✔✔✔ANSWER-Recover the refrigerant. what should you do when pressurizing a system with nitrogen? - ✔✔✔ANSWER-Charge through a pressure regulator and install a relief valve in the line downstream from the pressure regulator. CFCs will not be manufactured in the United States after what year?
what criteria must recovery equipment meet if manufactured after November 15, 1993? - ✔✔✔ANSWER-Must meet stringent vacuum standards. Certified by an EPA laboratory. Equipped with low-loss fittings. what are the leak repair requirements for comfort cooling appliances and commercial appliances containing 50 lbs. or more of refrigerant? - ✔✔✔ANSWER-Must be repaired if leak rate exceeds 15% in comfort cooling appliances. Must be repaired if leak rate exceeds 35% in all commercial and industrial process refrigeration. under what circumstances can recovered refrigerant be reused? - ✔✔✔ANSWER-Refrigerant may be returned to the appliance from which it was removed or to another appliance owned by the same person without being recycled or reclaimed. what are considered "major" repairs according to the EPA? - ✔✔✔ANSWER-Removal of the Compressor. Condenser. Evaporator. or an auxiliary heat exchanger coil.
where is the rupture disc on a low-pressure centrifugal system and where should the disc be vented to? - ✔✔✔ANSWER-Location: On the evaporator. Discharge from the disc should be vented outside. under ASHRAE Standard 34, R-134a is classified as? - ✔✔✔ANSWER-A-1. what certification does a technician require in order repair a chiller operating with R-22? - ✔✔✔ANSWER-Type II certification. what equipment should be used to test a tube? - ✔✔✔ANSWER- Hydrostatic tube test kit. which organization establishes the refrigerant safety group standard? - ✔✔✔ANSWER-ASHRAE. does refrigerant go out of the system in low pressure systems or does air and moisture go in? - ✔✔✔ANSWER-Air and moisture enter the refrigerant system because it operates in a vacuum. how can a technician determine when it is safe to start charging with liquid refrigerant? - ✔✔✔ANSWER-Refrigerant saturation temperature reaches 36*F or the vapor pressure reaches 16.9" Hg vacuum.
what are ways you can increase the pressure in the system? - ✔✔✔ANSWER-Heater blankets. Controller hot water. how can you speed up the vapor recovery process? - ✔✔✔ANSWER- A heater on the recovery vessel side will help to evacuate the vapor faster. the state of the refrigerant leaving the liquid receiver of a refrigeration system is what? - ✔✔✔ANSWER-High-pressure liquid. can a hermetic compressor be operated when the system is in a deep vacuum? - ✔✔✔ANSWER-NO. All refrigeration recovery cylinders must be (blank) approved. - ✔✔✔ANSWER-DOT. R-11, R-12, R-113, R-114,R-115 are all what kind of refrigerants? - ✔✔✔ANSWER-CFC. R-125, R-134A, R-23, R-32, R-125, R-143a, R-152A are all what kind of refrigerants? - ✔✔✔ANSWER-HFC.
what does Self Contained (active) recovery equipment mean? - ✔✔✔ANSWER-Using equipment's own compressor for recovery. fastest method to recover refrigerant is when it is in what state? - ✔✔✔ANSWER-Liquid state. the slowest method to recover refrigerant is when it is in what state?
R-11 is what type of refrigerant? - ✔✔✔ANSWER-CFC. R-134a is what type of refrigerant? - ✔✔✔ANSWER-HFC. ODP is a measurement of CFCs and HCFCs ability to do what? - ✔✔✔ANSWER-Destroy/Deplete the ozone. technicians servicing small appliances must be certified in refrigerant recovery if they do what? - ✔✔✔ANSWER-Perform sealed system service. all equipment must be equipped with what type of fittings? - ✔✔✔ANSWER-Low-loss fittings. what is the EPA requirement for leak repair for small appliances? - ✔✔✔ANSWER-Leaks should be repaired whenever possible. before beginning a refrigerant recovery procedure, it is necessary to know what? - ✔✔✔ANSWER-The type of refrigerant that is in the system. it is necessary to frequently check and change the recycling machine's (blank) and (blank). - ✔✔✔ANSWER-Filter. Oil.
