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Refrigeration and Air Conditioning Exam
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Refrigeration and Air Conditioning Exam

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Questions and Answers

What factors affect the evacuation process?

  • The size of the equipment being evacuated and the type of refrigerant
  • The ambient temperature and the amount of moisture in the system (correct)
  • The pressure of the system and the type of evacuation equipment
  • All of the above

    • What elements do HCFC refrigerants contain?

  • Helium, chlorine, fluorine, carbon
  • Hydrogen, oxygen, fluorine, carbon
  • Nitrogen, chlorine, fluorine, carbon
  • Hydrogen, chlorine, fluorine, carbon (correct)

    • What could be the reason if a system will not hold vacuum after it has been evacuated?

  • The system is overcharged
  • The system may be leaking (correct)
  • The system is undercharged
  • The system is not properly insulated

    • What is required for all recovery equipment being made?

    <p>An EPA approved certification label</p> Signup and view all the answers

    What is the color code for approved refrigerant recovery cylinders?

    <p>Yellow tops and gray bodies</p> Signup and view all the answers

    What should a technician do with refrigerant during servicing?

    <p>Recover it into a separate tank</p> Signup and view all the answers

    What type of oil is commonly used in stationary air conditioning applications with HFC-410A refrigerant?

    <p>ester oil</p> Signup and view all the answers

    What is ozone in the stratosphere above the earth composed of?

    <p>Molecules of 3 oxygen atoms</p> Signup and view all the answers

    When can you use a disposable cylinder to recover refrigerant?

    <p>Never</p> Signup and view all the answers

    What is the primary purpose of a Type II certification?

    <p>To recover CFC-13 and CFC-503 refrigerants</p> Signup and view all the answers

    Why should PPE be worn when handling refrigerant cylinders?

    <p>To prevent inhalation of refrigerant vapors</p> Signup and view all the answers

    What determines the length of dehydration time?

    <p>The size of the vacuum pump and suction line</p> Signup and view all the answers

    What should a technician explain to a customer regarding refrigerant recovery efforts?

    <p>That it is necessary to protect human health and the environment</p> Signup and view all the answers

    What can happen if refrigerant vapors or mist are inhaled?

    <p>Heart irregularities and/or unconsciousness may occur</p> Signup and view all the answers

    What can state and local governments create regarding environmental regulations?

    <p>Laws that follow the Clean Air Act</p> Signup and view all the answers

    What is a violation of the Clean Air Act?

    <p>Falsifying or failing to keep required records</p> Signup and view all the answers

    What elements do HFC refrigerants contain?

    <p>Hydrogen, fluorine, carbon</p> Signup and view all the answers

    What does it mean if an oil is hygroscopic?

    <p>It readily absorbs moisture</p> Signup and view all the answers

    What type of recovery equipment relies on the pressure of the refrigerant in the appliance?

    <p>System-dependent</p> Signup and view all the answers

    What is the process of removing refrigerant from a system and storing it in an external container?

    <p>Recovering</p> Signup and view all the answers

    What is used to remove ice from a sight glass?

    <p>An alcohol spray</p> Signup and view all the answers

    What type of refrigerants are chlorine-free?

    <p>HFCs</p> Signup and view all the answers

    Why is the recovery of refrigerants necessary?

    <p>To prevent stratospheric ozone depletion and maintain adequate supplies</p> Signup and view all the answers

    What is an example of an HFC refrigerant?

    <p>R-410A</p> Signup and view all the answers

    What does a compound pressure gauge typically measure?

    <p>Pressure in psig and inches of mercury</p> Signup and view all the answers

    What is the process of cleaning refrigerant by oil separation and filter-driers called?

    <p>Recycling</p> Signup and view all the answers

    What is the range of a high pressure gauge on service manifold sets?

    <p>0 to 500 psi</p> Signup and view all the answers

    What type of cylinder is designed to hold recovered refrigerant?

    <p>Cylinder with a gray body and a yellow top</p> Signup and view all the answers

    What type of refrigerant is the least harmful to stratospheric ozone?

    <p>HFCs</p> Signup and view all the answers

    What is the most effective method for locating the general area of a small leak?

    <p>Electronic or ultrasonic tester</p> Signup and view all the answers

    What percentage of capacity should a refillable refrigerant cylinder never be filled to by weight?

    <p>80%</p> Signup and view all the answers

    Which type of refrigerant has the highest ozone depletion potential?

    <p>CFCs</p> Signup and view all the answers

    What is the chemical found in the upper stratosphere that indicates ozone layer destruction?

    <p>Chlorine monoxide</p> Signup and view all the answers

    What factors affect the speed of evacuation?

    <p>All of the above</p> Signup and view all the answers

    What elements are found in HCFC refrigerants?

    <p>Hydrogen, chlorine, fluorine, carbon</p> Signup and view all the answers

    What does it indicate if a system will not hold vacuum after evacuation?

    <p>The system may be leaking</p> Signup and view all the answers

    When can a disposable cylinder be used to recover refrigerant?

    <p>Never</p> Signup and view all the answers

    What color code is used for approved refrigerant recovery cylinders?

    <p>Yellow tops and gray bodies</p> Signup and view all the answers

    Study Notes

    Refrigerants and Ozone Depletion

    • CFCs, HCFCs, and HFCs contribute to global warming.
    • CFCs will no longer be manufactured or imported into the United States after 1995.

    Refrigerant Types and Components

    • HFC refrigerants contain hydrogen, fluorine, and carbon.
    • HCFC refrigerants contain hydrogen, chlorine, fluorine, and carbon.
    • CFCs contain chlorine, fluorine, and carbon.
    • HFCs are less harmful to stratospheric ozone than CFCs.
    • Refrigerants containing Bromine are the most harmful to stratospheric ozone.

    Refrigerant Recovery and Handling

    • The recovery of refrigerants is necessary to maintain adequate supplies for service calls, prevent venting to the atmosphere, and prevent stratospheric ozone depletion.
    • Recovery equipment that relies on the pressure of the refrigerant in the appliance is considered system-dependent.
    • Recovery equipment that relies on the compressor in the system is also considered system-dependent.
    • "Self-contained" recovery devices can capture liquid and/or vapor refrigerant without assistance from components in the air-conditioning or refrigeration equipment.
    • A cylinder with a gray body and a yellow top is designed to hold recovered refrigerant.
    • Refillable refrigerant cylinders must never be filled to more than 80% of their capacity by weight.

    Safety and Equipment

    • PPE (gloves, safety glasses, safety shoes, etc.) should always be worn when handling and filling refrigerant cylinders.
    • Refrigerant vapors or mist should not be inhaled because they may cause heart irregularities and/or unconsciousness.
    • An oil sample should be taken for reasons such as the system having a leak or a major component failure.
    • Use an alcohol spray to remove ice from a sight glass.
    • A compound pressure gauge, typically used on the low side of the system, measures pressure in psig and inches of mercury.

    Environmental Regulations

    • Violations of the Clean Air Act include falsifying or failing to keep required records, failing to reach required evacuation levels, and knowingly releasing CFC or HCFC refrigerants or their substitutes.
    • State and local governments can make laws that follow the Clean Air Act/EPA regulations or contain stricter regulations.
    • The EPA requires the installation of a service aperture or process stub on all appliances using a class I or class II substance as a refrigerant.

    Ozone Depletion

    • Ozone depletion in the stratosphere is a global problem.
    • Ozone in the stratosphere above the earth consists of molecules of 3 oxygen atoms.
    • Chlorine monoxide is a chemical found in the upper stratosphere, indicating that the ozone layer is being destroyed.

    Miscellaneous

    • Technicians receiving a passing grade on the Type II (medium-pressure, high-pressure, and very high-pressure) exam are certified to recover refrigerant during maintenance, service, or repair of medium- and high-pressure equipment.
    • Ester-based oils can be mixed with no other oils.
    • The synthetic lubricant presently used with ternary blends containing HCFCs is alkylbenzene.
    • If a system will not hold vacuum after it has been evacuated, it may be leaking.
    • The size of the equipment being evacuated, the ambient temperature, and the amount of moisture in the system affect the speed of evacuation.

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    Description

    This quiz covers questions related to refrigeration and air conditioning, including types of refrigerants, oils used, and technician certifications.

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