The United States Air Force Wfm Trivia Quiz!

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| By Airforce1747
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Quizzes Created: 1 | Total Attempts: 116
Questions: 98 | Attempts: 116

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The United States Air Force Wfm Trivia Quiz! - Quiz

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Questions and Answers
  • 1. 

    Which reverse osmosis water purification units are specifically designed for the US Air Force? 

    • A.

      WPES–10 and H–9518–1.

    • B.

      WPES–20 and H–9518–2.

    • C.

      WPES–30 and H–9518–3.

    • D.

      WPES–40 and H–9518–4.

    Correct Answer
    B. WPES–20 and H–9518–2.
  • 2. 

    Which color band designates reverse osmosis water purification unit piping that carries filtered water? 

    • A.

      Yellow

    • B.

      Black

    • C.

      Green

    • D.

      Blue

    Correct Answer
    A. Yellow
    Explanation
    Yellow color band designates reverse osmosis water purification unit piping that carries filtered water.

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  • 3. 

    Which color band designates reverse osmosis water purification unit piping that carries product water? 

    • A.

      Yellow

    • B.

      Black

    • C.

      Green

    • D.

      Blue

    Correct Answer
    D. Blue
    Explanation
    Blue is the correct answer because in the context of reverse osmosis water purification, blue color is commonly used to designate piping that carries product water. This color coding system helps to easily identify and differentiate between different types of piping in a water purification unit, ensuring that the product water is correctly routed and preventing any cross-contamination with other types of water or fluids.

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  • 4. 

     How many gallons per hour does the H–9518–2 reverse osmosis water purification unit produce (on average)? 

    • A.

      600

    • B.

      650

    • C.

      1200

    • D.

      1250

    Correct Answer
    A. 600
    Explanation
    The H-9518-2 reverse osmosis water purification unit produces an average of 600 gallons per hour.

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  • 5. 

    What is the capacity of the reverse osmosis water purification unit raw water pump? 

    • A.

      30

    • B.

      60

    • C.

      90

    • D.

      120

    Correct Answer
    A. 30
    Explanation
    The capacity of the reverse osmosis water purification unit raw water pump is 30.

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  • 6. 

     The movement of water through a permeable membrane from an area of lesser concentration to an area of higher concentration is called:

    • A.

      Osmosis

    • B.

      Reverse osmosis

    • C.

      Reverse filtration

    • D.

      Inverse preassure

    Correct Answer
    A. Osmosis
    Explanation
    Osmosis is the correct answer because it refers to the movement of water through a permeable membrane from an area of lesser concentration to an area of higher concentration. This process occurs in order to equalize the concentration of solutes on both sides of the membrane. Reverse osmosis, reverse filtration, and inverse pressure are not accurate terms for this specific process.

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  • 7. 

     What percent of organic materials in water is removed by the reverse osmosis water purification unit? 

    • A.

      50

    • B.

      79

    • C.

      90

    • D.

      99

    Correct Answer
    D. 99
    Explanation
    The reverse osmosis water purification unit removes 99% of organic materials in water.

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  • 8. 

     Unless otherwise directed by medical authorities, how many parts per million of chlorine residual must you keep in the product water produced by the reverse osmosis water purification unit? 

    • A.

      1

    • B.

      2

    • C.

      3

    • D.

      4

    Correct Answer
    B. 2
    Explanation
    The correct answer is 2. The question is asking about the minimum amount of chlorine residual that must be maintained in the product water produced by the reverse osmosis water purification unit. The answer is 2 parts per million, unless there are specific instructions or guidelines from medical authorities stating otherwise.

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  • 9. 

    Which chemical is used as a coagulant aid during the reverse osmosis water purification unit treatment process? Which chemical is used as a coagulant aid during the reverse osmosis water purification unit treatment process?Which chemical is used as a coagulant aid during the reverse osmosis water purification unit treatment process?  

    • A.

      Polymer

    • B.

      Chlorine

    • C.

      Citric Acid

    • D.

      Sodium Hex

    Correct Answer
    A. Polymer
    Explanation
    Polymer is used as a coagulant aid during the reverse osmosis water purification unit treatment process. It helps in the coagulation of suspended particles and impurities in the water, allowing them to be easily removed during the purification process.

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  • 10. 

    Sodium hex is fed by the reverse osmosis water purification unit chemical feed pump at the:

    • A.

      Multimedia filter pump.

    • B.

      Multimedia filter influent.

    • C.

      Reverse osmosis element pump.

    • D.

      Reverse osmosis element influent.

    Correct Answer
    B. Multimedia filter influent.
    Explanation
    The correct answer is multimedia filter influent. Sodium hex is fed by the reverse osmosis water purification unit chemical feed pump at the multimedia filter influent. This means that the sodium hex is introduced into the water at the point where it enters the multimedia filter.

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  • 11. 

    What type of valve is used to backwash the multimedia filter on the reverse osmosis water purification unit?

    • A.

      Gate.

    • B.

      Globe.

    • C.

      Butterfly.

    • D.

      Multiport.

    Correct Answer
    D. Multiport.
    Explanation
    The correct answer is Multiport. A multiport valve is used to backwash the multimedia filter on the reverse osmosis water purification unit. This type of valve allows for multiple ports or positions, which enables the flow of water to be redirected during the backwashing process. By using a multiport valve, the multimedia filter can be effectively cleaned and maintained, ensuring the proper functioning of the reverse osmosis water purification unit.

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  • 12. 

    The multimedia filter pressure gauge on the reverse osmosis water purification unit indicates:

    • A.

      Suction pressure.

    • B.

      Negative pressure.

    • C.

      Differential pressure.

    • D.

      Product water pressure.

    Correct Answer
    C. Differential pressure.
    Explanation
    The multimedia filter pressure gauge on the reverse osmosis water purification unit indicates differential pressure. This means that it measures the difference in pressure between two points in the system. In the case of the multimedia filter, it measures the pressure difference across the filter media, indicating the level of clogging or buildup. This information is important for maintenance and ensuring optimal performance of the water purification unit.

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  • 13. 

    What tests are taken utilizing the color comparator?

    • A.

      Total dissolved solids.

    • B.

      Nitrates

    • C.

      Phosphates.

    • D.

      Chlorine and pH.

    Correct Answer
    D. Chlorine and pH.
    Explanation
    The color comparator is used to test for chlorine and pH levels. This device allows for the comparison of color changes in a sample to determine the concentration of chlorine or the pH level. It is commonly used in water testing to ensure that the water is safe for consumption and to monitor its quality.

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  • 14. 

    In which order do the high-pressure safety devices on the WPES–20 reverse osmosis water purification unit activate?

    • A.

      High-pressure relief valve, high-pressure switch, rupture disc assembly.

    • B.

      High-pressure switch, high-pressure relief valve, rupture disc assembly.

    • C.

      High-pressure relief valve, rupture-disc assembly, high-pressure switch.

    • D.

      Low-pressure switch, high-pressure switch, rupture disc assembly, high-pressure relief valve.

    Correct Answer
    D. Low-pressure switch, high-pressure switch, rupture disc assembly, high-pressure relief valve.
  • 15. 

    Technically speaking, what physical impact does the choice of a clear water source have on the reverse osmosis water purification unit (ROWPU)?

    • A.

      Lower working pressure is exerted on the RO elements.

    • B.

      Water source will be relatively free of pollutants.

    • C.

      Less frequent backwashings will be realized.

    • D.

      Less wear and tear on the RO pump.

    Correct Answer
    C. Less frequent backwashings will be realized.
    Explanation
    The choice of a clear water source for the reverse osmosis water purification unit (ROWPU) will result in less frequent backwashings. This is because a clear water source contains fewer impurities and contaminants that can clog the RO elements. With fewer clogs, the system will require less frequent backwashings to clean and maintain its efficiency.

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  • 16. 

    How far away from the campsite should you set up the reverse osmosis water purification unit?

    • A.

      100 feet upstream.

    • B.

      200 yards upstream.

    • C.

      300 feet downstream.

    • D.

      400 yards downstream.

    Correct Answer
    A. 100 feet upstream.
    Explanation
    Setting up the reverse osmosis water purification unit 100 feet upstream from the campsite is the correct answer because it ensures that the purified water is not contaminated by any potential pollutants or waste that may be present downstream. By locating the unit upstream, any impurities in the water will be filtered out before it reaches the campsite, providing clean and safe drinking water for the campers.

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  • 17. 

    Where are the two deionization cartridges packed in the H–9518–2 model reverse osmosis water purification unit?

    • A.

      First layer.

    • B.

      Second layer.

    • C.

      Third layer.

    • D.

      Fourth layer.

    Correct Answer
    B. Second layer.
    Explanation
    In the H-9518-2 model reverse osmosis water purification unit, the two deionization cartridges are packed in the second layer.

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  • 18. 

    What is the maximum total dissolved solids (TDS) the factory-calibrated in-line TDS monitor can read?

    • A.

      1,000.

    • B.

      2,000

    • C.

      3,000

    • D.

      4,000

    Correct Answer
    C. 3,000
    Explanation
    The maximum total dissolved solids (TDS) that the factory-calibrated in-line TDS monitor can read is 3,000.

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  • 19. 

    What initial action drives the ocean intake wellpoint into the ocean floor?

    • A.

      Pressure exerted down on the wellpoint.

    • B.

      Water pressure from the pump.

    • C.

      Suction action of pump.

    • D.

      Wellpoint driving tool.

    Correct Answer
    B. Water pressure from the pump.
    Explanation
    The correct answer is water pressure from the pump. When the pump is activated, it creates a suction force that draws water from the surrounding area, including the ocean floor. This water pressure pushes the ocean intake wellpoint into the ocean floor, allowing it to extract water efficiently.

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  • 20. 

    Which technical order do you use when operating the H–9581–2 reverse osmosis water purification unit?

    • A.

      40W4–13–41.

    • B.

      39W9–13–41

    • C.

      38W8–13–41

    • D.

      37W7–13–41.

    Correct Answer
    A. 40W4–13–41.
  • 21. 

    During initial start-up of the reverse osmosis water purification unit (ROWPU), all chemical feed valves must be set to:

    • A.

      Off.

    • B.

      Feed

    • C.

      Prime.

    • D.

      Standby.

    Correct Answer
    C. Prime.
    Explanation
    During the initial start-up of the reverse osmosis water purification unit (ROWPU), it is necessary to set all chemical feed valves to "prime." This means that the valves should be opened to allow the chemicals to flow into the system and begin the purification process. This step is crucial for ensuring that the correct amount of chemicals is introduced into the system to achieve optimal water quality. Setting the valves to "off" would prevent any chemical feed, while "feed" would continuously introduce chemicals, and "standby" would imply that the system is not actively purifying the water.

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  • 22. 

    What is the initial setting of all the chemical pump control knobs on the reverse osmosis water purification unit?

    • A.

      0

    • B.

      2

    • C.

      6

    • D.

      10

    Correct Answer
    D. 10
    Explanation
    The initial setting of all the chemical pump control knobs on the reverse osmosis water purification unit is 10.

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  • 23. 

    What is the maximum reverse osmosis pump pressure that should never be exceeded when operating the reverse osmosis water purification unit?

    • A.

      What is the maximum reverse osmosis pump pressure that should never be exceeded when operating the reverse osmosis water purification unit?

    • B.

      500 psi (seawater), 980 psi (brackish water).

    • C.

      960 psi (seawater), 500 psi (brackish water).

    • D.

      500 psi (seawater), 960 psi (brackish water).

    Correct Answer
    C. 960 psi (seawater), 500 psi (brackish water).
    Explanation
    The maximum reverse osmosis pump pressure that should never be exceeded when operating the reverse osmosis water purification unit is 960 psi for seawater and 500 psi for brackish water.

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  • 24. 

    What component of the reverse osmosis water purification unit controls the backwash procedure?

    • A.

      Element cleaning switch.

    • B.

      Backwash strainer.

    • C.

      Backwash pump.

    • D.

      Backwash timer.

    Correct Answer
    D. Backwash timer.
    Explanation
    The backwash procedure in a reverse osmosis water purification unit is controlled by the backwash timer. This timer determines the duration and frequency of the backwash process, which is essential for maintaining the efficiency and effectiveness of the unit. The backwash timer ensures that the system is properly cleaned and any accumulated debris or contaminants are removed, allowing the unit to continue operating at optimal performance.

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  • 25. 

    What is the purpose of feeding citric acid into the reverse osmosis water purification unit (ROWPU) during the production run?

    • A.

      Increase the pH of raw water.

    • B.

      Increase the pH of product water.

    • C.

      Reduce scale build-up on the RO elements.

    • D.

      Reduce scale build-up on the cartridge filter elements.

    Correct Answer
    C. Reduce scale build-up on the RO elements.
    Explanation
    Feeding citric acid into the reverse osmosis water purification unit (ROWPU) during the production run helps reduce scale build-up on the RO elements. Scale build-up can occur due to the presence of minerals and impurities in the water, which can negatively affect the efficiency and performance of the RO elements. Citric acid acts as a chelating agent, binding to these minerals and impurities and preventing them from forming scale on the RO elements. By reducing scale build-up, the ROWPU can operate more effectively and maintain a higher level of water purification.

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  • 26. 

    At what point do you set the citric acid chemical feed valve back to the prime position?

    • A.

      When the pH reads between 2–3.

    • B.

      When the pH reads between 2–3.

    • C.

      When the pH reads between 5–8.

    • D.

      When the pH reads between 9–12.

    Correct Answer
    C. When the pH reads between 5–8.
    Explanation
    The correct answer is when the pH reads between 5-8. This is because citric acid is commonly used as a pH adjuster and buffer in various applications. In order to maintain the desired pH level, the citric acid chemical feed valve should be set back to the prime position when the pH reading falls within the range of 5-8. This ensures that the correct amount of citric acid is being added to maintain the desired pH level and prevent any potential issues that may arise from an imbalanced pH.

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  • 27. 

    Which reverse osmosis water purification unit pump is used to recirculate the citric acid solution during the reverse osmosis element cleaning procedure?

    • A.

      Distribution

    • B.

      Backwash

    • C.

      Raw water.

    • D.

      Reverse osmosis.

    Correct Answer
    B. Backwash
    Explanation
    The correct answer is "Backwash." During the reverse osmosis element cleaning procedure, the backwash pump is used to recirculate the citric acid solution. This pump helps to remove any accumulated debris or fouling on the reverse osmosis membrane, ensuring its optimal performance.

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  • 28. 

    Once initiated, when do you stop the reverse osmosis water purification unit reverse osmosis element cleaning procedure?

    • A.

      After 45 minutes has expired.

    • B.

      After 15 minutes has expired.

    • C.

      When the pH of product tank is below 3.5.

    • D.

      When the pH of product water is above 3.5.

    Correct Answer
    A. After 45 minutes has expired.
    Explanation
    The reverse osmosis water purification unit reverse osmosis element cleaning procedure should be stopped after 45 minutes has expired. This indicates that the cleaning process has been completed and continuing it further may not be necessary or may even be detrimental to the system.

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  • 29. 

    Cartridge filter replacement is indicated on the reverse osmosis water purification unit when the:

    • A.

      Influent pressure of the multimedia filter exceeds 20 psi.

    • B.

      Influent pressure of the cartridge filter exceeds 15 psi.

    • C.

      Differential pressure of the multimedia filter exceeds 20 psid.

    • D.

      Differential pressure of the cartridge filter exceeds 15 psid.

    Correct Answer
    C. Differential pressure of the multimedia filter exceeds 20 psid.
    Explanation
    When the differential pressure of the multimedia filter exceeds 20 psid, it indicates that the cartridge filter needs to be replaced in the reverse osmosis water purification unit. This means that there is a significant pressure difference between the influent and effluent sides of the multimedia filter, indicating that it is becoming clogged and not effectively filtering the water. Replacing the cartridge filter will ensure that the water continues to be properly purified.

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  • 30. 

    What should you do just before you loosen the eyebolts of the reverse osmosis water purification unit cartridge filter cover?

    • A.

      Backwash the filter.

    • B.

      Start-up the ROWPU.

    • C.

      Fill the filter with water.

    • D.

      Mark the position of the cover.

    Correct Answer
    D. Mark the position of the cover.
    Explanation
    Before loosening the eyebolts of the reverse osmosis water purification unit cartridge filter cover, it is important to mark the position of the cover. This is necessary to ensure that the cover is properly aligned and reinstalled in the correct position after maintenance or cleaning. By marking the position of the cover, it becomes easier to reassemble the unit accurately, preventing any potential issues or damage that may occur if the cover is not properly aligned.

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  • 31. 

    You must replace the reverse osmosis water purification unit reverse osmosis elements when the:

    • A.

      Citric acid feeding and both element cleaning methods are not effective.

    • B.

      Elements have been backwashed 3 times.

    • C.

      Element end connectors are damaged.

    • D.

      Element interconnectors are damaged.

    Correct Answer
    A. Citric acid feeding and both element cleaning methods are not effective.
    Explanation
    When the citric acid feeding and both element cleaning methods are not effective, it indicates that the reverse osmosis water purification unit reverse osmosis elements are not being adequately cleaned and maintained. This can lead to a decrease in the efficiency and effectiveness of the purification process. Therefore, it is necessary to replace the elements to ensure the continued production of clean and purified water.

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  • 32. 

    What occurs when the end connectors or the interconnectors of the reverse osmosis water purification unit get damaged by high pressure?

    • A.

      Osmosis

    • B.

      Reverse osmosis.

    • C.

      Filtration

    • D.

      Reverse filtration.

    Correct Answer
    A. Osmosis
    Explanation
    When the end connectors or interconnectors of a reverse osmosis water purification unit get damaged by high pressure, osmosis occurs. Osmosis is the process by which solvent molecules pass through a semi-permeable membrane from an area of lower solute concentration to an area of higher solute concentration, in this case, water molecules passing through the damaged connectors. This can lead to a decrease in the efficiency of the reverse osmosis unit and potentially affect the quality of the purified water.

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  • 33. 

    What is the best way to protect hardwall piping from solar radiation?

    • A.

      Bury piping.

    • B.

      Paint piping.

    • C.

      Keep water constantly moving.

    • D.

      Cover pipe with camouflage material.

    Correct Answer
    A. Bury piping.
    Explanation
    Burying piping is the best way to protect it from solar radiation because the soil acts as a natural insulator, preventing direct exposure to sunlight. This helps to maintain a consistent temperature and prevents the piping from overheating or degrading due to UV radiation. Additionally, burying the piping also protects it from physical damage and potential vandalism.

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  • 34. 

    Under normal conditions, what are the proper parts per million and hours needed for chlorine to disinfect the Basic Expeditionary Airfield Resources water distribution system?

    • A.

      20, 12.

    • B.

      20, 24.

    • C.

      10, 12.

    • D.

      10, 24.

    Correct Answer
    D. 10, 24.
    Explanation
    The proper parts per million (ppm) of chlorine needed to disinfect the Basic Expeditionary Airfield Resources water distribution system under normal conditions is 10. Additionally, it requires 24 hours for the chlorine to effectively disinfect the system.

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  • 35. 

    The chlorine residual of a Basic Expeditionary Airfield Resources water distribution system should never be lower than

    • A.

      1 part per million at the point of use.

    • B.

      5 parts per million at the point of use.

    • C.

      1 part per million at the point of injection.

    • D.

      5 parts per million at the point of injection.

    Correct Answer
    A. 1 part per million at the point of use.
    Explanation
    The correct answer is 1 part per million at the point of use. This means that the chlorine residual in the water distribution system should never be lower than 1 part per million when it reaches the point where it is being used by individuals. This is important to ensure that the water is properly disinfected and safe for consumption. The chlorine residual at the point of injection refers to the amount of chlorine added to the system, while the chlorine residual at the point of use is the amount remaining in the water after it has traveled through the distribution system.

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  • 36. 

    How many reverse osmosis water purification units (ROWPU) make up the 1500gph ROWPU water production subsystem?

    • A.

      1

    • B.

      2

    • C.

      3

    • D.

      4

    Correct Answer
    B. 2
    Explanation
    The 1500gph ROWPU water production subsystem is made up of 2 reverse osmosis water purification units (ROWPU).

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  • 37. 

    The 500 follow-on subsystem is functionally identical to what other water distribution subsystem?

    • A.

      550 initial subsystem.

    • B.

      Source run subsystem.

    • C.

      550 follow-on subsystem.

    • D.

      Industrial operations and flightline extension subsystem.

    Correct Answer
    A. 550 initial subsystem.
    Explanation
    The 500 follow-on subsystem is functionally identical to the 550 initial subsystem.

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  • 38. 

    What is provided with the Industrial operations and flightline extension subsystem to protect the water distribution system piping from damage?

    • A.

      Couplings.

    • B.

      Piping sleeves.

    • C.

      Warning markers.

    • D.

      Hose rollover protection ramps.

    Correct Answer
    D. Hose rollover protection ramps.
    Explanation
    The Industrial operations and flightline extension subsystem provides hose rollover protection ramps to protect the water distribution system piping from damage. These ramps are designed to prevent hoses from being crushed or damaged when vehicles or equipment drive over them, ensuring the integrity of the water distribution system and preventing leaks or breaks in the piping. Couplings, piping sleeves, and warning markers may have other functions or purposes, but they do not specifically protect the water distribution system piping from damage.

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  • 39. 

    What components make up the Basic Expeditionary Airfield Resources package macerator pump lift stations?

    • A.

      Submersible centrifugal pump, pump lift out assembly and three floats.

    • B.

      Two submersible centrifugal pump, pump lift out assembly and four floats.

    • C.

      Submersible macerator pump, pump lift out assembly and three floats.

    • D.

      Two submersible macerator pumps, pump lift out assembly, and four floats.

    Correct Answer
    C. Submersible macerator pump, pump lift out assembly and three floats.
    Explanation
    The Basic Expeditionary Airfield Resources package macerator pump lift stations consist of a submersible macerator pump, a pump lift out assembly, and three floats.

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  • 40. 

    After experiencing unusually long pump runs, how do you inspect the dual pump station’s accumulator to determine if it has become waterlogged?

    • A.

      Depress air valve.

    • B.

      Centrifugal pump control.

    • C.

      Pressure drop in the system.

    • D.

      Pressure increase in the system.

    Correct Answer
    A. Depress air valve.
    Explanation
    To determine if the dual pump station's accumulator has become waterlogged after experiencing unusually long pump runs, you would depress the air valve. By depressing the air valve, any excess water in the accumulator will be released, indicating that it has become waterlogged. This action helps to restore the proper functioning of the accumulator and prevent any damage or inefficiency in the pump system.

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  • 41. 

    If the pressure switch on the 35gpm electric pump is not operating properly, what is the first step you should take to correct the problem after de-energizing the unit?

    • A.

      Clean the contacts.

    • B.

      Replace the contacts.

    • C.

      Replace the pressure switch.

    • D.

      Tap on the pressure switch housing.

    Correct Answer
    A. Clean the contacts.
    Explanation
    If the pressure switch on the 35gpm electric pump is not operating properly, the first step to correct the problem after de-energizing the unit is to clean the contacts. This is because dirty or corroded contacts can prevent proper electrical connection and cause the switch to malfunction. By cleaning the contacts, any dirt or corrosion can be removed, allowing for better electrical conductivity and potentially resolving the issue with the pressure switch.

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  • 42. 

    When afloat is not working properly in the dual pump lift station, and you have cleaned it and observed that it is not getting hung up in the lift station itself, what is your next course of action?

    • A.

      Replace the float.

    • B.

      Have an electrician check the float.

    • C.

      Check the voltage to the lift station.

    • D.

      Shake the float to knock the contacts loose.

    Correct Answer
    B. Have an electrician check the float.
    Explanation
    If the float is not working properly even after cleaning and it is not getting stuck in the lift station, the next course of action would be to have an electrician check the float. This is because the issue might be with the electrical components of the float, such as the wiring or the contacts. An electrician would be able to diagnose and fix any electrical problems with the float, ensuring that it functions properly.

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  • 43. 

    What is the likely problem if a lift station pump is running backwards?

    • A.

      Voltage too low.

    • B.

      Voltage too high

    • C.

      Phase voltage is incorrect.

    • D.

      Impeller was installed backwards.

    Correct Answer
    C. Phase voltage is incorrect.
    Explanation
    If a lift station pump is running backwards, the likely problem is that the phase voltage is incorrect. Phase voltage refers to the voltage supplied to the motor's windings, and if it is incorrect, it can cause the motor to run in the opposite direction. This can happen due to incorrect wiring or a fault in the electrical system.

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  • 44. 

    How many washer and dryers are provided with the self-help laundry?

    • A.

      Three washers and three double stacked dryers.

    • B.

      Four washers and four double stacked dryers.

    • C.

      Five washers and five double stacked dryers.

    • D.

      Six washers and six double stacked dryers.

    Correct Answer
    C. Five washers and five double stacked dryers.
    Explanation
    The self-help laundry provides five washers and five double stacked dryers.

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  • 45. 

    How do you ensure that all the air has been released from the self-help laundry’s water heater?

    • A.

      Crack the union.

    • B.

      Check the effluent.

    • C.

      Operate a washing machine.

    • D.

      Open the water heater relief valve until water appears.

    Correct Answer
    D. Open the water heater relief valve until water appears.
    Explanation
    To ensure that all the air has been released from the self-help laundry's water heater, you need to open the water heater relief valve until water appears. This is because the relief valve is designed to release any excess pressure or air that may have built up in the water heater. By opening the valve, any trapped air will be released and water will start flowing out, indicating that all the air has been purged from the system.

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  • 46. 

    What technical order action do you follow to correct the self-help laundry’s water heater if the water is too hot?

    • A.

      Adjust the thermostat.

    • B.

      Contact HVAC personnel.

    • C.

      Partially close the gate valve.

    • D.

      Test and service the mixing valve.

    Correct Answer
    D. Test and service the mixing valve.
    Explanation
    To correct the self-help laundry's water heater if the water is too hot, the correct technical order action is to test and service the mixing valve. The mixing valve is responsible for controlling the temperature of the water by blending hot and cold water. By testing and servicing the mixing valve, any issues or malfunctions can be identified and repaired, ensuring that the water temperature is regulated properly.

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  • 47. 

    What effect does grease have on the electric kitchens evaporation beds?

    • A.

      Attracts beneficial bacteria.

    • B.

      Slows the evaporation process.

    • C.

      Enhances the bacteriological process.

    • D.

      Grease does not affect the evaporation process.

    Correct Answer
    B. Slows the evaporation process.
    Explanation
    Grease slows down the evaporation process in electric kitchens' evaporation beds. This is because grease forms a layer on the surface of the water, creating a barrier that hinders the evaporation of water molecules. As a result, the presence of grease reduces the rate at which the water in the evaporation beds evaporates.

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  • 48. 

    How much sand is required when a 20,000-gallon water bladder is placed on rocky or uneven surfaces?

    • A.

      2 inches.

    • B.

      3 inches

    • C.

      4 inches

    • D.

      5 inches.

    Correct Answer
    A. 2 inches.
    Explanation
    The 20,000-gallon water bladder needs 2 inches of sand when placed on rocky or uneven surfaces. This amount of sand is necessary to provide a stable and level base for the bladder, ensuring that it is properly supported and does not get damaged by the rough surface.

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  • 49. 

    What is the maximum allowable height you can fill a 20,000-gallon water bladder?

    • A.

      34 inches.

    • B.

      44 inches

    • C.

      54 inches

    • D.

      64 inches

    Correct Answer
    D. 64 inches
    Explanation
    The maximum allowable height you can fill a 20,000-gallon water bladder is 64 inches. This means that the bladder can hold up to 20,000 gallons of water when filled up to a height of 64 inches.

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  • 50. 

    How many males and females does one field deployable latrine service?

    • A.

      Four toilets and two urinal troughs that drain into a 360-gallon waste tank.

    • B.

      Five toilets and one urinal trough that drain into a 180-gallon waste tank.

    • C.

      Six toilets and one urinal trough that drain into a 360-gallon waste tank

    • D.

      Seven toilets and two urinal troughs that drain into a 180-gallon waste tank.

    Correct Answer
    C. Six toilets and one urinal trough that drain into a 360-gallon waste tank

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