Type Of Refrigerant Vacuum Pump Quiz

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Quizzes Created: 4 | Total Attempts: 3,074
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  • 1/85 Questions

    ________ microns is equal to 1 mm Hg.

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About This Quiz

A refrigerator helps keep food from going bad at the house or the office. To be able to fix a refrigerator ensure you give it to someone certified to work on refrigerators. Are you working to get that certificate? The test below is designed to jolt your memory on refrigerator pumps. Good luck in the exams.

Type Of Refrigerant Vacuum Pump Quiz - Quiz

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  • 2. 

    There are ________ microns in 1 mm Hg.

    Explanation
    The question asks for the number of microns in 1 mm Hg. Since there are 1,000 microns in 1 mm and the answer choices are "1,000" and "1000", both options are correct.

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  • 3. 

    Refrigerants that damage the ozone layer contain an element called ________.

    Explanation
    Refrigerants that damage the ozone layer contain an element called chlorine. Chlorine is known to be a major contributor to ozone depletion due to its ability to break down ozone molecules in the stratosphere. When released into the atmosphere, chlorine reacts with ozone, causing it to break apart and deplete the ozone layer. This is why it is important to phase out the use of chlorine-containing refrigerants and switch to more environmentally friendly alternatives.

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  • 4. 

    When refrigerant cylinder is connected to an operating system, the pressure in the cylinder will be ________ than the suction pressure of the system.

    Explanation
    When a refrigerant cylinder is connected to an operating system, the pressure in the cylinder will be higher than the suction pressure of the system. This is because the refrigerant in the cylinder is typically stored at a higher pressure than what is required for the system to function properly. When the cylinder is connected, the higher pressure from the cylinder allows the refrigerant to flow into the system and maintain the necessary pressure levels for efficient operation.

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  • 5. 

    A deep vacuum involves reducing the pressure in a refrigeration system to a micron gauge reading of ________ or below.

    Explanation
    A deep vacuum involves reducing the pressure in a refrigeration system to a micron gauge reading of 500 or below. The terms "500 psig" and "500 psi" refer to pressure measurements in pounds per square inch gauge, which are not relevant to the given question about micron gauge readings. Therefore, the correct answer is only "500".

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  • 6. 

    The DOT-approved cylinder in which refrigerant may be recovered has a mechanism for shutting the recovery system off when it reaches approximately ________ full.

    Explanation
    The DOT-approved cylinder for refrigerant recovery has a mechanism that automatically shuts off the recovery system when it reaches approximately 80% full or 4/5 of its total capacity. This is done to prevent overfilling and potential safety hazards.

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  • 7. 

    The fastest way to remove refrigerant from a system is with the refrigerant in a ________.

    Explanation
    The fastest way to remove refrigerant from a system is with the refrigerant in a liquid state. This is because liquid refrigerant has a higher density compared to gas, allowing for a larger volume to be removed in a shorter amount of time. Additionally, liquid refrigerant is easier to handle and control during the removal process, making it more efficient and quicker.

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  • 8. 

    The refrigerant in vapor form is added to the system through the ________ side of the system.

    Explanation
    The refrigerant in vapor form is added to the system through the low pressure side of the system because this is where the refrigerant is at a lower pressure and temperature. By adding the vapor refrigerant at this point, it allows it to be compressed and condensed to a liquid state, which is necessary for the refrigeration process to occur effectively. Adding the vapor refrigerant at the low pressure side ensures that it can properly circulate through the system and absorb heat from the surroundings.

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  • 9. 

    The temperature sensitive resistor commonly used in a vacuum gauges is called a ________.

    Explanation
    A thermistor is a temperature sensitive resistor commonly used in vacuum gauges. It is designed to have a resistance that changes with temperature, making it suitable for measuring and monitoring temperature variations in a vacuum environment. The resistance of a thermistor decreases as the temperature increases, and vice versa. This characteristic allows it to accurately measure temperature changes and provide reliable data for vacuum pressure calculations.

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  • 10. 

    Only two substances should be in the refrigeration system for proper operation.  They are ________ and ________.

    Explanation
    The refrigeration system requires the presence of two substances for proper operation: refrigerant and oil. Refrigerant is the substance responsible for absorbing heat from the refrigerated space and releasing it outside. Oil, on the other hand, is necessary for lubricating the moving parts of the system, such as the compressor. Both substances play crucial roles in maintaining the efficiency and functionality of the refrigeration system.

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  • 11. 

    The ________ is used to help technicians perform a number of tasks including taking pressure readings on the high side of the system and trapping all of the system refrigerant in the receiver to perform system service.

    Explanation
    The king valve is a crucial component used by technicians to carry out various tasks in a refrigeration system. It enables them to take pressure readings on the high side of the system, which helps in diagnosing and troubleshooting issues. Additionally, the king valve is responsible for trapping all of the system refrigerant in the receiver, allowing technicians to perform necessary maintenance or repairs on the system without any leakage.

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  • 12. 

    When using a "standing pressure test" for leak-checking, ________ should never be used since an explosive mixture can be created.

    Explanation
    When using a "standing pressure test" for leak-checking, air should never be used since an explosive mixture can be created. This is because air contains oxygen, which is highly flammable. If there is a leak and a flammable substance is present, the combination of air and the substance can create an explosive mixture. Therefore, it is important to use a non-flammable substance, such as nitrogen, for leak-checking in order to avoid any potential hazards.

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  • 13. 

    The sensing element of a micron gauge must always be mounted with the fitting at the ________.

    Explanation
    The sensing element of a micron gauge must always be mounted with the fitting at the bottom. This is because the bottom position allows for accurate measurement and detection of the pressure or vacuum level. Placing the fitting at the bottom ensures that any air or gas being measured will flow directly into the sensing element, providing precise readings. Mounting the sensing element with the fitting at any other position could lead to inaccurate measurements and compromised performance of the micron gauge.

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  • 14. 

    The charging device that holds refrigerant, has a visible column of liquid, and can be used to "visually" see the amount of refrigerant used is called the ________.

    Explanation
    A graduated cylinder is a charging device used to hold refrigerant and has a visible column of liquid. It allows users to visually see the amount of refrigerant being used. This device is commonly used in refrigeration systems to measure and control the amount of refrigerant being added or removed.

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  • 15. 

    The trapping of the Earth's heat in the atmosphere which is causing global warming is called the ________.

    Explanation
    The trapping of the Earth's heat in the atmosphere is known as the Green House Effect. This phenomenon occurs when certain gases in the atmosphere, such as carbon dioxide and methane, trap heat from the sun and prevent it from escaping back into space. This leads to an increase in the Earth's temperature, causing global warming. The term "Green House Effect" is derived from the way a greenhouse functions, where the glass traps heat inside, similar to how these gases trap heat in the Earth's atmosphere.

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  • 16. 

    Ozone is produced mainly by a process called ________ .

    Explanation
    Ozone is not produced by photosynthesis. Photosynthesis is the process by which plants convert sunlight into energy and produce oxygen. Ozone, on the other hand, is produced mainly by a process called photolysis, which occurs when oxygen molecules are broken down by ultraviolet radiation from the sun.

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  • 17. 

    As refrigerant vapor is removed from a supply cylinder, the pressure in the supply cylinder will ________.

    Explanation
    As refrigerant vapor is removed from a supply cylinder, the pressure inside the cylinder will decrease. This is because the removal of vapor reduces the number of gas molecules in the cylinder, leading to a decrease in collisions between molecules and a subsequent decrease in pressure.

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  • 18. 

    Production of CFC refrigerants became illegal on ________.

    Explanation
    The production of CFC refrigerants became illegal on January 1, 1996. This means that after this date, it was no longer permitted to manufacture or produce CFC refrigerants. This was likely due to the harmful effects of CFCs on the ozone layer and the environment. The phase-out of CFCs was part of international efforts to protect the ozone layer and reduce the use of substances that contribute to ozone depletion.

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  • 19. 

    The small amount of refrigerant released when removing gauge hoses from the system is called ________.

    Explanation
    The small amount of refrigerant released when removing gauge hoses from the system is called "de minimus." This term refers to a minimal or insignificant amount, indicating that the quantity of refrigerant released during this process is negligible and does not have a significant impact on the overall system.

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  • 20. 

    A manufacturer's charging chart may be used when available to determine the correct charge for a system.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    A manufacturer's charging chart is a useful tool for determining the correct charge for a system. It provides specific guidelines and recommendations from the manufacturer on how much refrigerant should be added to the system. By following the chart, technicians can ensure that the system is charged properly, which is crucial for optimal performance and efficiency. Therefore, the statement is true.

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  • 21. 

    The fine for venting refrigerant into the atmosphere can be as high as ________ per day.

    Correct Answer
    $25,000
    $27,500
    $32,500
    Explanation
    The fine for venting refrigerant into the atmosphere can be as high as $25,000, $27,500, or $32,500 per day.

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  • 22. 

    Air entering a refrigerant system can eventually lead to compressor failure.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Air entering a refrigerant system can lead to compressor failure because air contains moisture and contaminants that can cause corrosion and damage to the compressor components. When the air mixes with the refrigerant, it forms acids that can eat away at the compressor's internal parts. Additionally, air can cause the formation of ice inside the system, leading to blockages and reduced efficiency. Therefore, it is crucial to prevent air from entering the refrigerant system to ensure the proper functioning and longevity of the compressor.

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  • 23. 

    The DOT-approved cylinder used for recovering refrigerant is gray and yellow.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The DOT-approved cylinder used for recovering refrigerant is gray and yellow because these colors are specifically designated for this purpose. The gray color indicates that the cylinder is designed for hazardous materials, while the yellow color signifies that it is meant for refrigerants. This color coding system helps to ensure that the correct cylinders are used for handling and storing different types of substances, promoting safety and compliance with regulations.

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  • 24. 

    Sludge is a produced when ________, ________, and ________ are present in the system.

    Correct Answer
    acid, oil, moisture
    acid, moisture, oil
    oil, acid, moisture
    oil, moisture, acid
    moisture, acid, oil
    Explanation
    moisture, oil, acid acceptable too

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  • 25. 

    The maximum recommended pressure for leak testing is 150 psig.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The maximum recommended pressure for leak testing is 150 psig. This means that it is advised to not exceed this pressure when conducting leak tests. Going above this pressure could potentially cause damage or lead to inaccurate results. Therefore, it is important to adhere to this recommendation to ensure safe and effective leak testing.

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  • 26. 

    One good feature of an electronic charging scale is that it counts upward as refrigerant is removed, to tell the the technician how much refrigerant was used.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    An electronic charging scale is designed to measure the amount of refrigerant being removed from a system. It is equipped with a feature that counts upward, allowing the technician to keep track of the amount of refrigerant used. This feature is useful in determining the amount of refrigerant that needs to be replaced or added to the system accurately. Therefore, the statement is true.

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  • 27. 

    Using a restrictor, liquid refrigerant can be charged into the low-side of the system with the system operating.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The statement is true because a restrictor is used to control the flow of liquid refrigerant into the low-side of the system while it is operating. This allows for a controlled and gradual charging of the refrigerant, ensuring that the system does not get overwhelmed with too much refrigerant at once. This method of charging helps to maintain the stability and efficiency of the system.

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  • 28. 

    HCFC-based blends work best with ________ lubricants, while HFC-based blends work best with ________ lubricants.

    Correct Answer
    alkylbenzene, ester
    Explanation
    HCFC-based blends work best with alkylbenzene lubricants because alkylbenzene has good solubility with HCFC refrigerants and provides good lubrication properties. On the other hand, HFC-based blends work best with ester lubricants because ester lubricants have better compatibility with HFC refrigerants and offer superior lubrication performance in HFC systems.

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  • 29. 

    When taking a temperature reading of a copper suction line, it is important to insulate the sensing element to give a more accurate reading.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Insulating the sensing element when taking a temperature reading of a copper suction line helps in providing a more accurate reading. Copper is a good conductor of heat, so without insulation, the sensing element may be affected by the surrounding temperature, leading to an inaccurate reading. By insulating the sensing element, it is protected from external factors and can directly measure the temperature of the suction line, resulting in a more precise measurement.

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  • 30. 

    What effect is ozone depletion having on the environment?

    • Increased ground level ozone (smog)

    • Reduced marine life

    • Reduced crop fields

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    Ozone depletion is having multiple effects on the environment. Firstly, it is leading to increased ground level ozone, also known as smog, which is harmful to human health and can cause respiratory problems. Secondly, it is causing a reduction in marine life, as ozone depletion affects the food chain and disrupts ecosystems. Lastly, it is also reducing crop fields, as the depletion of ozone allows more harmful ultraviolet (UV) radiation to reach the Earth's surface, damaging plants and affecting agricultural productivity. Therefore, all of the given options are correct effects of ozone depletion on the environment.

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  • 31. 

    A refrigerant reclaimed from a system may be charged back into the system from which it came.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    When a refrigerant is reclaimed from a system, it means that it has been properly cleaned, purified, and restored to its original condition. Therefore, it is safe and suitable to be charged back into the same system from which it was removed. This process helps to reduce waste and minimize the need for new refrigerants, making it an environmentally friendly practice.

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  • 32. 

    Glide is the range of temperatures/pressures in which a blended refrigerant will condense.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The statement is true because glide refers to the temperature or pressure range over which a blended refrigerant will condense. This means that the refrigerant mixture will not condense at a single temperature or pressure, but rather over a range. Therefore, the statement is correct.

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  • 33. 

    To pull a vacuum means to ________.

    • Raise the pressure in a refrigeration system

    • Lower the pressure in a refrigeration system below atmospheric

    • Allow refrigerant to escape into the atmosphere

    • Condense the gas in the system

    Correct Answer
    A. Lower the pressure in a refrigeration system below atmospheric
    Explanation
    To pull a vacuum means to lower the pressure in a refrigeration system below atmospheric. This process is typically done to remove air and moisture from the system, creating a vacuum environment. By lowering the pressure, any unwanted gases or impurities can be eliminated, allowing for better performance and efficiency in the refrigeration system.

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  • 34. 

    Charging a refrigeration system refers to ________.

    • Removing refrigerant from a system

    • Adding refrigerant to a system

    • Cleaning the refrigerant

    • Vaporizing the refrigerant

    Correct Answer
    A. Adding refrigerant to a system
    Explanation
    Charging a refrigeration system refers to adding refrigerant to a system. This is necessary when the refrigerant level in the system is low or when the system has been repaired or maintained. Adding refrigerant helps to maintain the proper operating pressure and temperature in the system, allowing it to effectively cool or freeze the desired space or product.

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  • 35. 

    When working on a refrigeration or air-conditioning system, along with tools and test equipment, the service technician, to avoid penalty, must have a ________ or ________  on the job site.

    Correct Answer
    recovery, recycle unit
    recycle, recovery unit
    Explanation
    When working on a refrigeration or air-conditioning system, it is necessary for the service technician to have a recovery unit and a recycle unit on the job site. These units are essential for handling and managing the refrigerant in the system. The recovery unit is used to remove the refrigerant from the system safely, while the recycle unit is used to clean and purify the refrigerant for reuse. By having both units on the job site, the technician can ensure that they are following proper protocols and regulations for refrigerant handling, thereby avoiding any penalties.

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  • 36. 

    Refrigerant in vapor from is normally put into the system through the ________.

    • Liquid line

    • Suction line

    • Hot gas line

    • Liquid return line

    Correct Answer
    A. Suction line
    Explanation
    Refrigerant in vapor form is typically introduced into the system through the suction line. This line is responsible for drawing the refrigerant vapor from the evaporator and delivering it to the compressor for compression. The suction line plays a crucial role in the refrigeration cycle by ensuring the continuous flow of refrigerant and maintaining the system's cooling capacity.

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  • 37. 

    It is possible to have a leak-free system when under a vacuum but still leak when the system pressure is above atmospheric.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    In a vacuum, the pressure inside the system is lower than atmospheric pressure, which creates a pressure differential that helps to keep the system sealed and prevents leaks. However, when the system pressure is above atmospheric, there is no pressure differential to keep the system sealed, and leaks can occur. Therefore, it is possible to have a leak-free system under a vacuum but still experience leaks when the system pressure is above atmospheric.

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  • 38. 

    Mechanical refrigerant recovery equipment must meet specification established by the 1993 ARI 740 standard.

    • True

    • Flase

    Correct Answer
    A. True
    Explanation
    The statement is true because mechanical refrigerant recovery equipment needs to meet the specifications set by the 1993 ARI 740 standard. This standard ensures that the equipment is designed and built to effectively recover refrigerants, which is important for environmental and safety reasons. Compliance with this standard ensures that the equipment is efficient, reliable, and meets industry standards.

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  • 39. 

    When technicians works for a company in which the technician does not have a financial interest, the technician does not have to be certified.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Certification is a separate requirement from financial interest. Even if a technician does not have a financial interest in the company they work for, they still need to be certified in order to perform their job duties effectively and ensure the quality of their work. Therefore, the statement that the technician does not have to be certified is false.

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  • 40. 

    Noncondensable gases ________.

    • Are desirable in a refrigeration system

    • Are undesirable in a refrigeration system

    • Condense readily under normal atmospheric conditions

    • Help in pulling a vacuum

    Correct Answer
    A. Are undesirable in a refrigeration system
    Explanation
    Noncondensable gases are undesirable in a refrigeration system because they can interfere with the heat transfer process. These gases do not condense into a liquid state like the refrigerant, which can lead to reduced efficiency and performance of the system. Noncondensable gases can also cause issues such as increased pressure, reduced cooling capacity, and potential damage to the compressor. Therefore, it is important to remove these gases from the system to ensure optimal operation and prevent any potential problems.

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  • 41. 

    Which of the following refrigerants is considered an HFC-type of refrigerant?

    • R-134a

    • R-12

    • R-22

    • R-11

    Correct Answer
    A. R-134a
    Explanation
    R-134a is considered an HFC-type of refrigerant. HFC stands for hydrofluorocarbon, which is a type of synthetic refrigerant that does not contain chlorine. R-134a is commonly used in automotive air conditioning systems and is known for its low ozone depletion potential. In contrast, R-12, R-22, and R-11 are all types of refrigerants that contain chlorine and are classified as CFCs or HCFCs, which have been phased out due to their harmful effects on the ozone layer.

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  • 42. 

    The abbreviation for refrigerants containing chlorine, fluorine, carbon, and hydrogen is ________.

    • HFC

    • HCFC

    • CFC

    • HFAC

    Correct Answer
    A. HCFC
    Explanation
    HCFC stands for Hydrochlorofluorocarbon, which is the correct abbreviation for refrigerants containing chlorine, fluorine, carbon, and hydrogen. HCFCs are a type of refrigerant that have lower ozone depletion potential compared to CFCs (Chlorofluorocarbons). They are commonly used as alternatives to CFCs in various applications, including air conditioning and refrigeration systems. HCFCs still contribute to global warming, but their impact is less severe compared to CFCs.

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  • 43. 

    The abbreviation for refrigerants containing fluorine, carbon, and hydrogen is ________.

    • HFC

    • HCFC

    • CFC

    • HFAC

    Correct Answer
    A. HFC
    Explanation
    The correct answer is HFC. HFC stands for Hydrofluorocarbon, which is an abbreviation for refrigerants containing fluorine, carbon, and hydrogen. HFCs are commonly used as replacements for chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) due to their lower ozone depletion potential.

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  • 44. 

    The oil in a vacuum pump should be changed after each time it is used.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The oil in a vacuum pump should be changed after each use because it can become contaminated with moisture, dust, and other particles during the pumping process. Regularly changing the oil helps to maintain the efficiency and performance of the pump, ensuring that it continues to operate effectively. Failure to change the oil regularly can lead to decreased vacuum levels, reduced pump performance, and potential damage to the pump components. Therefore, it is important to change the oil after each use to maintain the pump's functionality.

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  • 45. 

    A multiple evacuation means that ________.

    • You connect three vacuum pumps simultaneously to a refrigeration system and pull a vacuum

    • You pull a vacuum on three different systems at the same time

    • You pull a vacuum on a refrigeration system more than once, allowing refrigerant or nitrogen into the system between each procedure

    • There must be more than one system operating before a vacuum can be pulled

    Correct Answer
    A. You pull a vacuum on a refrigeration system more than once, allowing refrigerant or nitrogen into the system between each procedure
  • 46. 

    Moisture in a liquid state must be ________ before it can be removed with a vacuum pump.

    • Vaporized

    • Condensed

    • Cooled

    • Solidified

    Correct Answer
    A. Vaporized
    Explanation
    Before moisture can be removed with a vacuum pump, it needs to be converted into a vapor state. This is because a vacuum pump works by creating a low-pressure environment, which allows the vaporized moisture to be drawn out more effectively. Therefore, the correct answer is "vaporized."

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  • 47. 

    The abbreviation for refrigerants containing chlorine, fluorine, and carbon is ________.

    • HFC

    • HCFC

    • CFC

    • HFAC

    Correct Answer
    A. CFC
    Explanation
    The correct answer is CFC, which stands for chlorofluorocarbon. Chlorofluorocarbons are a type of refrigerant that contain chlorine, fluorine, and carbon. These compounds were commonly used in refrigeration and air conditioning systems in the past, but they have been phased out due to their harmful effects on the ozone layer.

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  • 48. 

    When adding refrigerant in vapor form to a refrigeration system, the system motor/compressor assembly is running.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    When adding refrigerant in vapor form to a refrigeration system, the system motor/compressor assembly needs to be running. This is because the compressor is responsible for compressing the refrigerant vapor and increasing its pressure, which allows it to absorb heat from the surroundings and cool down. If the motor/compressor assembly is not running, the refrigerant cannot be properly circulated and the cooling process will not occur effectively. Thus, it is necessary for the motor/compressor assembly to be running when adding refrigerant in vapor form to a refrigeration system.

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  • 49. 

    When the system pressures are lower than the pressure in the refrigerant tank, such as when the system has just been evacuated or if the system is out of refrigerant, refrigerant can be added to both the high and low pressure sides of the system.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    When the system pressures are lower than the pressure in the refrigerant tank, it means that there is a lack of refrigerant in the system. In such cases, refrigerant can be added to both the high and low pressure sides of the system to restore the proper functioning of the system. This is because adding refrigerant to the system helps to balance the pressure and allows the system to operate effectively. Therefore, the statement "refrigerant can be added to both the high and low pressure sides of the system" is true.

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  • Current Version
  • Aug 28, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Sep 14, 2009
    Quiz Created by
    Azortex
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