Chlorofluorocarbon (CFC) Practice Test

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  • 1/100 Questions

    Hydrochlorofluorocarbon (HCFC) refrigerants contain __ .

    • Hydrogen, chlorine, fluorine, and carbon
    • Hydrogen, chlorine, fluorine, and calcium
    • Helium, chlorine, fluorine, and carbon
    • Hydrogen, chlorine, fluorine, and calcium
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About This Quiz

We welcome you to this informative Chlorofluorocarbon (CFC) Practice Test. Chlorofluorocarbon (CFC) is a nonflammable chemical that contains chlorine, fluorine, and carbon atoms. The following exam is produced to test knowledge of safe refrigerant handling and EPA regulations regarding the HVAC industry. It contains over hundred questions on the topic to make sure your knowledge level gets tested so you can prepare yourself for the final exam. We are confident you'll learn something new with this quiz. There is no time bar, so feel free to take this quiz as often as possible. Good Luck!

Chlorofluorocarbon (CFC) Practice Test - Quiz

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  • 2. 

    The ozone layer absorbs and scatters __ light from the sun, which prevents harmful amounts from reaching the earth.
    •  

    • Ultraviolet

    • Infrared

    • Visible

    • Moon

    Correct Answer
    A. Ultraviolet
    Explanation
    The ozone layer absorbs and scatters ultraviolet light from the sun, which prevents harmful amounts from reaching the earth. Ultraviolet light is a type of electromagnetic radiation that has a shorter wavelength and higher energy than visible light. It can cause damage to living organisms, including humans, such as sunburns, skin cancer, and damage to the eyes. The ozone layer acts as a protective shield, absorbing and scattering the majority of the ultraviolet light, thus reducing its harmful effects on the earth's surface.

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  • 3. 

    Hydrofluorocarbon (HFC) refrigerants contain __ .

    • Hydrogen, fluorine, and carbon

    • Hydrogen, fluorine and calcium.

    • Helium. fluorine, and carbon

    • Hydrogen, chlorine, fluorine, and carbon

    Correct Answer
    A. Hydrogen, fluorine, and carbon
    Explanation
    HFC refrigerants contain hydrogen, fluorine, and carbon. This is because HFCs are organic compounds that are composed of hydrogen, fluorine, and carbon atoms. These refrigerants are commonly used as alternatives to chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) due to their lower ozone depletion potential. HFCs are considered more environmentally friendly and are widely used in air conditioning and refrigeration systems.

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  • 4. 

    Capturing and ultimately eliminating the use of chlorofluorocarbons is being done in the United States to stop damage to the __ ozone layer.

    • Stratospheric

    • Ground

    • Ultra violet

    • Infrared

    Correct Answer
    A. Stratospheric
    Explanation
    The correct answer is "Stratospheric." The question is asking about the reason for capturing and eliminating the use of chlorofluorocarbons in the United States. The purpose is to prevent damage to the ozone layer, specifically the stratospheric ozone layer. Chlorofluorocarbons are known to deplete the ozone layer, particularly in the stratosphere, which is why efforts are being made to stop their use.

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  • 5. 

    When ozone depletion occurs, ______UV radiation penetrates to the Earth's surface.

    • More

    • Less

    • Alpha

    • Zama

    Correct Answer
    A. More
    Explanation
    When ozone depletion occurs, more UV radiation penetrates to the Earth's surface. Ozone depletion refers to the thinning of the ozone layer in the Earth's stratosphere, which is responsible for absorbing a significant amount of the Sun's UV radiation. When this protective layer is depleted, more UV radiation is able to reach the Earth's surface, which can have harmful effects on human health, ecosystems, and the environment.

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  • 6. 

    Chlorofluorocarbons (CFCs) consist of ___,  ___, and __ .

    • Chlorine, fluorine, carbon

    • .chlorine, fluorine, cesium

    • Carbon, fluorine, other chemicals

    • Cesium, fluoride, carbon

    • Chlorine, fluoride, carbon

    Correct Answer
    A. Chlorine, fluorine, carbon
    Explanation
    Chlorofluorocarbons (CFCs) are composed of chlorine, fluorine, and carbon. These compounds were commonly used in refrigerants, aerosol propellants, and foam-blowing agents. However, they have been found to be harmful to the ozone layer in the Earth's atmosphere. The chlorine atoms in CFCs are responsible for depleting the ozone layer by reacting with ozone molecules, breaking them apart. This reaction releases chlorine oxide, which can then catalytically destroy thousands of ozone molecules. The fluorine and carbon atoms in CFCs contribute to the stability and chemical properties of these compounds.

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  • 7. 

    Every refrigerant cylinder is equipped with a device that will automatically vent pressure from the cylinder before it reaches the rupture point. What is this devise called?

    • Safety (pressure) relief valve

    • Hand valve

    • Needle valve

    • Shraeder Valve

    Correct Answer
    A. Safety (pressure) relief valve
    Explanation
    The device that automatically vents pressure from a refrigerant cylinder before it reaches the rupture point is called a safety (pressure) relief valve. This valve is designed to release excess pressure in order to prevent the cylinder from exploding or causing any damage. It is an important safety feature in refrigerant cylinders to ensure the safe handling and storage of the refrigerant.

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  • 8. 

    State and local governments may establish laws that contain __ regulations than Clean Air Act/EPA regulations.

    • Stricter

    • Less restrictive

    • Either A or B

    • Neither A or B

    Correct Answer
    A. Stricter
    Explanation
    State and local governments have the authority to create laws that are more stringent or stricter than the regulations set by the Clean Air Act and the Environmental Protection Agency (EPA). This means that these governments can impose additional requirements or limitations on air quality standards and emissions control measures, going beyond the minimum standards set by the federal government. Therefore, the correct answer is "stricter".

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  • 9. 

    __ means, to remove refrigerant in any condition from a system and store it in an external container without necessarily testing or processing it in any way.

    • Recovery

    • Recycling

    • Reclamation

    • Recirculate

    Correct Answer
    A. Recovery
    Explanation
    Recovery means to remove refrigerant in any condition from a system and store it in an external container without necessarily testing or processing it in any way. This process is focused on collecting the refrigerant for later use or disposal, without any additional steps such as cleaning or filtering. It is simply the act of extracting the refrigerant from the system and storing it elsewhere.

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  • 10. 

    Before you dispose of any appliance containing refrigerant, you must recover the refrigerant.

    • CFC

    • HFC

    • HCFC

    • All three

    • Both A and B

    • Both A and C

    Correct Answer
    A. All three
    Explanation
    All three options, CFC, HFC, and HCFC, require the recovery of refrigerant before disposing of any appliance containing them. This means that regardless of the type of refrigerant used in the appliance, it is necessary to recover the refrigerant before disposal to prevent its release into the environment and potential harm to the ozone layer.

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  • 11. 

    Refrigerant vapors or mist in high concentrations should not be inhaled since they have been demonstrated to cause_______.

    • Heart irregularities

    • Unconsciousness

    • Oxygen deprivation

    • All of these

    Correct Answer
    A. All of these
    Explanation
    Refrigerant vapors or mist in high concentrations can cause a range of health issues, including heart irregularities, unconsciousness, and oxygen deprivation. These effects have been demonstrated through research and studies. Inhaling high concentrations of refrigerant can disrupt the normal functioning of the heart, leading to irregularities. It can also cause a person to become unconscious due to the impact on the respiratory system and oxygen levels. Additionally, inhaling these vapors can lead to oxygen deprivation, which can have serious consequences for the body. Therefore, all of these effects are associated with inhaling high concentrations of refrigerant vapors or mist.

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  • 12. 

    Approved refillable tanks should never be filled to more than __ of their total capacity.

    • 97%

    • 95%

    • 80%

    • 70%

    Correct Answer
    A. 80%
    Explanation
    Approved refillable tanks should never be filled to more than 80% of their total capacity because leaving some empty space allows for the expansion of the gas inside the tank due to temperature changes. Overfilling the tank can lead to dangerous situations such as leaks or explosions. By keeping the tank at 80% capacity, there is enough room for the gas to expand without causing any harm.

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  • 13. 

    __  are a result of damage to the Earth's ozone layer.

    • Skin cancers

    • Cataracts

    • Reduced crop yields

    • All three

    Correct Answer
    A. All three
    Explanation
    All three options - skin cancers, cataracts, and reduced crop yields - are a result of damage to the Earth's ozone layer. The ozone layer acts as a protective shield, blocking harmful ultraviolet (UV) rays from the sun. When the ozone layer is damaged, more UV rays reach the Earth's surface, leading to an increased risk of skin cancers and cataracts in humans. Additionally, UV radiation can also harm plants, reducing crop yields. Therefore, all three options are consequences of ozone layer damage.

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  • 14. 

    Recovery cylinders are painted __ in the shoulder area and twelve inches down the side.

    • Red

    • Green

    • Yellow

    • Blue

    Correct Answer
    A. Yellow
    Explanation
    Recovery cylinders are painted yellow in the shoulder area and twelve inches down the side.

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  • 15. 

    Refrigerant cylinders must bere-tested at ______ intervals.

    • Five-year

    • Monthly

    • Ten-year

    • Thirty-year

    Correct Answer
    A. Five-year
    Explanation
    Refrigerant cylinders must be re-tested at five-year intervals. This means that every five years, the cylinders need to undergo a testing process to ensure their safety and effectiveness. This is important because refrigerant cylinders contain potentially hazardous substances, and regular testing helps to prevent any leaks or malfunctions that could lead to accidents or damage. By re-testing every five years, the cylinders can be properly maintained and any potential issues can be identified and addressed in a timely manner.

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  • 16. 

    Refillable containers must meet __ requirements.

    • DOT

    • DOE

    • ARI

    • SAE

    Correct Answer
    A. DOT
    Explanation
    Refillable containers must meet DOT requirements. DOT stands for the Department of Transportation, which sets regulations and standards for the transportation of hazardous materials. These requirements ensure that the containers are safe for transportation and storage, minimizing the risk of accidents or leaks that could harm people or the environment. Meeting DOT requirements is crucial to ensure compliance with the law and maintain the safety of the transportation industry.

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  • 17. 

    Whenever a technician is working with any _______, the technician should always review the material safety data sheets, which by law should be shipped by the manufacturer with these compounds.

    • Unknown solvents

    • Unknown refrigerants

    • Unknown chemical

    • All of these

    Correct Answer
    A. All of these
    Explanation
    The correct answer is all of these. Whenever a technician is working with any unknown solvents, unknown refrigerants, or unknown chemicals, it is important for them to review the material safety data sheets (MSDS). These sheets contain important information about the composition, hazards, and safe handling procedures for the substances. By law, manufacturers are required to provide MSDSs for these compounds to ensure the safety of those working with them. Therefore, regardless of the specific type of compound, reviewing the MSDS is always necessary.

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  • 18. 

    When recovering refrigerant from an R-11 system, the service technician should keep the evaporator chiller water flowing to avoid __ .

    • Freezing of the water

    • Corrosion

    • Destruction of the ozone

    • Release of toxic fumes

    Correct Answer
    A. Freezing of the water
    Explanation
    When recovering refrigerant from an R-11 system, the service technician should keep the evaporator chiller water flowing to avoid freezing of the water. This is because R-11 is a type of refrigerant that operates at very low temperatures. If the evaporator chiller water is not flowing, it can become stagnant and freeze due to the cold temperatures of the refrigerant. This can cause damage to the system and potentially lead to a loss of efficiency or functionality. Therefore, it is important to keep the water flowing to prevent freezing and maintain proper operation of the system.

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  • 19. 

    A second category of refrigerants currently available is the hydrochlorofluorocarbons (HCFCs).  Although they contain chlorine, which is damaging to the ozone layer, they also contain_________, which makes them chemically less stable once they enter the atmosphere.

    • Hydrogen

    • Water

    • Bromine

    • Helium

    • Heptane

    Correct Answer
    A. Hydrogen
    Explanation
    HCFCs contain hydrogen, which makes them chemically less stable once they enter the atmosphere.

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  • 20. 

    Approved refrigerant recovery cylinders can be identified by ________.

    • Yellow tops and gray bodies

    • Gray tops and yellow bodies

    • Brown tops and green bodies

    • White tops and green bodies

    Correct Answer
    A. Yellow tops and gray bodies
    Explanation
    Approved refrigerant recovery cylinders can be identified by yellow tops and gray bodies. This color combination is used to distinguish them from other types of cylinders and indicates that they are specifically designed for refrigerant recovery. The yellow top serves as a visual indicator, making it easier to identify and differentiate these cylinders from others in a storage or transportation setting. The gray body may also be used to further differentiate the cylinders and ensure that they are easily recognizable as approved refrigerant recovery cylinders.

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  • 21. 

    CFCs are damaging to the __ ozone layer.

    • Atmospheric

    • Stratospheric

    • Marine

    • Climatic

    Correct Answer
    A. Stratospheric
    Explanation
    CFCs, or chlorofluorocarbons, are known to be harmful to the ozone layer. The ozone layer is located in the stratosphere, which is the second layer of the Earth's atmosphere. Therefore, the correct answer is "stratospheric."

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  • 22. 

    Of the three common types of refrigerants __ has the highest high ozone-depletion potential (ODP).
    •  

    • CFCs

    • HCFCs

    • HFCs

    • LJCs

    Correct Answer
    A. CFCs
    Explanation
    CFCs, or chlorofluorocarbons, have the highest ozone-depletion potential (ODP) among the three common types of refrigerants. This means that CFCs have the greatest ability to deplete the ozone layer when released into the atmosphere.

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  • 23. 

    Used disposable refrigerant cylinders can be _____. '

    • Recycled with other scrap metal after they are emptied and rendered useless

    • Filled with compressed air to fix flats

    • Re-certified as Recovery Tanks after painting

    • Refilled twice before discarding

    Correct Answer
    A. Recycled with other scrap metal after they are emptied and rendered useless
    Explanation
    Used disposable refrigerant cylinders can be recycled with other scrap metal after they are emptied and rendered useless because they are no longer suitable for their intended purpose. Once the cylinders are emptied and no longer contain any refrigerant, they can be treated as scrap metal and recycled along with other metal materials. This helps to reduce waste and promote environmental sustainability.

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  • 24. 

    Refillable cylinders are regulated in their design, fabrication and testing by the _________ for use in the transportation of refrigerants-

    • EPA

    • DOT

    • DOD

    • EPRI

    Correct Answer
    A. DOT
    Explanation
    Refillable cylinders used for transporting refrigerants are regulated in their design, fabrication, and testing by the DOT (Department of Transportation). The DOT sets standards and regulations to ensure the safety and integrity of these cylinders during transportation. They establish guidelines for the construction, materials, pressure ratings, and testing procedures to ensure that the cylinders can safely contain and transport refrigerants without any risk of leakage or failure.

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  • 25. 

    _______ is the transfer of refrigerant, in any condition, from a system to a storage container, without testing or purifying the refrigerant in any way.

    • Recirculation

    • Recycling

    • Recovery

    • Reclamation

    Correct Answer
    A. Recovery
    Explanation
    Recovery is the correct answer because it refers to the process of transferring refrigerant from a system to a storage container without any testing or purification. This means that the refrigerant is collected as is, without any additional steps taken to clean or filter it. Recirculation, recycling, and reclamation all involve additional processes to treat the refrigerant before it is reused or returned to the system, which is not the case in recovery.

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  • 26. 

    All devices used for refrigerant recovery must meet __ standards.
    •  

    • EPA

    • DOT

    • DOE

    • EPRI

    Correct Answer
    A. EPA
    Explanation
    All devices used for refrigerant recovery must meet EPA standards. The EPA (Environmental Protection Agency) sets regulations and standards for the safe handling and disposal of refrigerants, including the recovery of refrigerants from appliances and equipment. These standards ensure that the recovery process is done in an environmentally responsible manner, preventing the release of harmful substances into the atmosphere. Meeting EPA standards is important for maintaining the integrity of the environment and protecting human health.

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  • 27. 

    _______ can be used with R-22 to leak check hardware.

    • Oxygen

    • Compressed air

    • Nitrogen

    • Any of these

    Correct Answer
    A. Nitrogen
    Explanation
    Nitrogen can be used with R-22 to leak check hardware. Nitrogen is often used in HVAC systems to test for leaks because it is an inert gas that does not react with other substances. It is safe to use and does not contribute to ozone depletion. Therefore, nitrogen is a suitable choice for leak checking hardware when R-22 is involved.

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  • 28. 

     In cases where the refrigerant cannot be reclaimed due to contamination with other refrigerants, the refrigerant __ .
    •  

    • Can be legally vented to the atmosphere since it can't be reclaimed

    • Must be destroyed by incineration at a approved facility

    • Must be used only in Small Appliances

    • Must be transferred into a disposable cylinder and discarded at a municipal landfill

    Correct Answer
    A. Must be destroyed by incineration at a approved facility
  • 29. 

    __ in refrigerants causes ozone destruction.
    •  

    • Chlorine

    • Fluorine

    • Both chlorine and fluorine

    • Both fluoride and carbon

    Correct Answer
    A. Chlorine
    Explanation
    Chlorine in refrigerants causes ozone destruction. Chlorine reacts with ozone molecules in the stratosphere, breaking them apart and depleting the ozone layer. This reaction is known as ozone depletion. Fluorine, on the other hand, does not cause ozone destruction. Therefore, the correct answer is chlorine.

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  • 30. 

    The Clean Air Act __ .
    •  

    • Calls for the phase-out of CFC/HCFC production

    • Prohibits CFC/HCFC venting as of July 1, 1992

    • Requires the EPA to set standards for equipment and technicians

    • All the above

    Correct Answer
    A. All the above
    Explanation
    The Clean Air Act encompasses all of the mentioned actions. It calls for the phase-out of CFC/HCFC production, prohibits CFC/HCFC venting as of July 1, 1992, and requires the EPA to set standards for equipment and technicians.

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  • 31. 

    HFC fluorocarbon refrigerants cause no harm to the stratospheric ozone, they have

    • Zero ODP

    • Low ODP

    • High ODP

    • Zero GHE

    Correct Answer
    A. Zero ODP
    Explanation
    HFC fluorocarbon refrigerants cause no harm to the stratospheric ozone because they have zero ODP (Ozone Depletion Potential). ODP is a measure of a substance's potential to deplete the ozone layer. Therefore, HFC fluorocarbon refrigerants do not contribute to ozone depletion and are considered environmentally friendly in terms of ozone layer protection.

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  • 32. 

    The existence of __ in the upper stratosphere indicates that the ozone layer is being destroyed.

    • Chlorine monoxide

    • Water

    • Ozone

    • Both A and C

    Correct Answer
    A. Chlorine monoxide
    Explanation
    Chlorine monoxide is known to be a major contributor to the destruction of the ozone layer. When chlorine monoxide reacts with ozone, it forms chlorine gas, which can then continue to react with more ozone molecules, leading to the depletion of the ozone layer. Therefore, the presence of chlorine monoxide in the upper stratosphere indicates that the ozone layer is being destroyed.

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  • 33. 

     __ is a blend of two or more components whose equilibrium vapor phase and liquid phase compositions are the same at a given pressure.

    • Azeotrope

    • Compound

    • Fractionation

    • Halocarbon

    Correct Answer
    A. Azeotrope
    Explanation
    An azeotrope is a blend of two or more components whose equilibrium vapor phase and liquid phase compositions are the same at a given pressure. This means that the mixture behaves as if it were a single component, making it difficult to separate the components by fractional distillation.

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  • 34. 

    R-134a tanks are __________.
    •  

    • Light blue

    • Green

    • Orange

    • Yellow

    Correct Answer
    A. Light blue
  • 35. 

    The EPA defines __ as maintenance, service, or repair that involves removal of the appliance's compressor, condenser, evaporator, or auxiliary heat exchanger oi1.

    • Major maintenance

    • Minor maintenance

    • System maintenance

    • Service maintenance

    Correct Answer
    A. Major maintenance
    Explanation
    Major maintenance refers to maintenance, service, or repair that involves the removal of important components of an appliance's cooling system, such as the compressor, condenser, evaporator, or auxiliary heat exchanger oil. This type of maintenance is more extensive and requires specialized skills and knowledge. It may involve significant repairs or replacements of critical parts of the appliance's cooling system.

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  • 36. 

    The system vacuum gauge should be connected __ .

    • Close to the vacuum pump

    • As close as possible to the system being evacuated

    • In series to avoid EPA problems

    • In parallel to avoid EPA problems

    Correct Answer
    A. As close as possible to the system being evacuated
    Explanation
    The system vacuum gauge should be connected as close as possible to the system being evacuated in order to accurately measure the level of vacuum in the system. Placing the gauge close to the system ensures that it is measuring the actual vacuum level at the location where it is most important. This allows for more precise monitoring and control of the vacuum process. Connecting the gauge close to the system being evacuated also helps to minimize any potential inaccuracies or errors that may occur due to distance or other factors.

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  • 37. 

    Chemically, oxygen is 02, and ozone is _____.
    •  

    • O1

    • O2

    • O3

    • O4

    • O5

    Correct Answer
    A. O3
    Explanation
    Ozone is chemically represented as O3. This is because ozone is composed of three oxygen atoms bonded together. In contrast, oxygen is represented as O2, as it consists of two oxygen atoms bonded together.

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  • 38. 

    The Environmental Protection Agency is authorized to pay awards of up to _____ to any person who furnishes information which leads to a criminal conviction of another person for violation of the Clean Air Act

    • $1,000

    • $2,000

    • $10,000

    • $25,000

    Correct Answer
    A. $10,000
    Explanation
    The correct answer is $10,000. This amount is authorized by the Environmental Protection Agency to be paid as an award to any person who provides information that leads to a criminal conviction of another person for violating the Clean Air Act. This incentive is meant to encourage individuals to come forward and report violations, thereby aiding in the enforcement of the Act and the protection of the environment.

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  • 39. 

    A __ blend is a two-part mixture.

    • Binary

    • Ternary

    • Unitary

    • Both A and C

    Correct Answer
    A. Binary
    Explanation
    A binary blend refers to a mixture that consists of two parts or components. It is called "binary" because it involves two elements or factors. In this context, the correct answer is "binary" because it accurately describes a two-part mixture.

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  • 40. 

    Pressure relief valves must never be __ .

    • Installed in series

    • Used if rusted or corroded

    • Tampered with

    • All of these

    Correct Answer
    A. All of these
    Explanation
    Pressure relief valves must never be installed in series, used if rusted or corroded, or tampered with. Installing them in series can lead to improper functioning and potentially dangerous situations. Using a rusted or corroded valve can compromise its ability to relieve pressure effectively, risking system failure. Tampering with the valve, such as adjusting the set pressure or disabling it, can also result in unsafe conditions. Therefore, all of these actions should be avoided to ensure the proper operation and safety of pressure relief valves.

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  • 41. 

    __ recovery devices are so named because they depend on components of the system; that is, they capture refrigerant with the assistance of components in the air conditioning or refrigeration equipment they are emptying.
    •  

    • System-dependent

    • Self-contained

    • System-independent

    • Approved

    • Illegal

    • Automatic

    Correct Answer
    A. System-dependent
    Explanation
    Recovery devices are named "system-dependent" because they rely on the components of the air conditioning or refrigeration system to capture refrigerant. This means that the devices use the existing components of the system to assist in the recovery process, rather than being self-contained or independent from the system.

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  • 42. 

    __ is a halogenated hydrocarbon containing one or more of the three halogens: fluorine, chlorine, and bromine.

    • Azeotrope

    • Compound

    • Fractionation

    • Halocarbon

    Correct Answer
    A. Halocarbon
    Explanation
    A halocarbon is a halogenated hydrocarbon that contains one or more of the three halogens: fluorine, chlorine, and bromine. This means that the compound has been chemically modified to include one or more of these halogens in its structure. Halocarbons have various applications, including as refrigerants, solvents, and propellants. They are also used in the production of plastics, pharmaceuticals, and agricultural chemicals.

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  • 43. 

    CFCs are chemically very stable because they contain no __ .
    •  

    • Hydrogen

    • Bromine

    • Chlorine

    • .air

    Correct Answer
    A. Hydrogen
    Explanation
    CFCs are chemically very stable because they contain no hydrogen. Hydrogen atoms are highly reactive and can participate in chemical reactions, leading to the breakdown of molecules. Since CFCs do not have any hydrogen atoms, they are less likely to undergo chemical reactions and remain stable in the environment.

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  • 44. 

    _ test methods are assumed by the EPA as the most effective methods for locating the general area of small leaks.
    •  

    • Electronic and Ultrasonic

    • Halide torch

    • Soap bubble

    • Both I and 2

    Correct Answer
    A. Electronic and Ultrasonic
    Explanation
    Electronic and ultrasonic test methods are assumed by the EPA as the most effective methods for locating the general area of small leaks. These methods use specialized equipment to detect and measure the sound or electronic signals produced by the leak. By analyzing these signals, the general area of the leak can be identified. Other methods such as using a halide torch or soap bubble may not be as effective in locating small leaks. Therefore, the correct answer is electronic and ultrasonic.

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  • 45. 

    Refrigerants which contain no chlorine at all are called __
    •  

    • CFCs

    • HCFCs

    • HFCs

    • ODCs

    Correct Answer
    A. HFCs
    Explanation
    Refrigerants that contain no chlorine at all are called HFCs.

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  • 46. 

    Ozone in the stratosphere consists of' molecules containing __ oxygen atom(s).

    • 1

    • 2

    • 3

    • 4

    Correct Answer
    A. 3
    Explanation
    Ozone in the stratosphere consists of molecules containing three oxygen atoms.

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  • 47. 

    A device that removes air and other non-condensables from the top of the condenser of a centrifugal refrigeration system during operation is called a ____.

    • System dependent recirculation unit

    • Purge unit

    • System dependent recovery unit

    • System independent recovery unit

    Correct Answer
    A. Purge unit
    Explanation
    A purge unit is a device that removes air and other non-condensables from the top of the condenser of a centrifugal refrigeration system during operation. It helps to maintain the efficiency and performance of the system by eliminating any unwanted gases that may hinder the condensation process.

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  • 48. 

    The component which changes a low-pressure vapor to a high-pressure vapor is the

    • Evaporator

    • Condenser

    • Compressor

    • Expansion device or TXV

    Correct Answer
    A. Compressor
    Explanation
    The compressor is responsible for changing a low-pressure vapor to a high-pressure vapor. It does this by increasing the pressure and temperature of the refrigerant gas, which allows it to circulate through the system and release heat in the condenser. The compressor plays a crucial role in the refrigeration cycle by maintaining the flow of refrigerant and ensuring efficient cooling.

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  • 49. 

    When pressurizing a refrigeration system with nitrogen, _____.

    • A nitrogen regulator is not required since the pressure is low

    • Charge with liquid nitrogen whenever possible since it is faster

    • Only charge with nitrogen vapor and use a regulator

    • Both A and B above

    Correct Answer
    A. Only charge with nitrogen vapor and use a regulator
    Explanation
    When pressurizing a refrigeration system with nitrogen, it is recommended to only charge with nitrogen vapor and use a regulator. This is because nitrogen vapor is safer to use compared to liquid nitrogen, as it reduces the risk of freezing or damaging the system. Additionally, using a regulator helps to control and maintain the desired pressure level in the system. Therefore, option C is the correct answer.

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  • Current Version
  • Jan 13, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Apr 12, 2011
    Quiz Created by
    Pbarton
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