Liquid Fuels Systems-cdc3e452 (Vol.4)

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  • 1/66 Questions

    (606) When removing a manual valve from a pipeline, which bolts on the valve should you loosen first to drain the fuel drip pan?

    • Top
    • Bottom
    • Left side
    • Right side
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About This Quiz


Liquid Fuels Maintenance Journeyman
CDC 3E451
Volume 4: Operation and Maintenance of Mechanical System Components

Liquid Fuels Systems-cdc3e452 (Vol.4) - Quiz

Quiz Preview

  • 2. 

    (602) What type of manual valve can be used to control the rate of product flow?

    • Plug

    • Gauge

    • Check

    • Globe

    Correct Answer
    A. Globe
    Explanation
    A globe valve can be used to control the rate of product flow. Globe valves have a spherical-shaped body with an internal baffle, which creates a tortuous path for the fluid to flow through. By adjusting the position of the valve's disc, the flow rate can be regulated. This makes globe valves suitable for controlling the rate of fluid flow in various applications, including industrial processes and pipelines.

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  • 3. 

    (604) What type of valve used in fuel systems must be fire tested and qualified in accordance with the requirements of API standard 607 and operate from fully closed to fully open with a 90 degree rotation of the ball?

    • Gate

    • Ball

    • Plug

    • Globe

    Correct Answer
    A. Ball
    Explanation
    Ball valves are used in fuel systems and must be fire tested and qualified according to API standard 607. These valves operate from fully closed to fully open with a 90-degree rotation of the ball. Therefore, the correct answer is ball.

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  • 4. 

    (611) What action should you take if you notice a slight leak on a mechanical seal you have just installed?

    • Replace the O-ring

    • Replace the seal and O-ring

    • Stop the pump, restart, and see what happens

    • Allow reasonable time for the seals to adjust

    Correct Answer
    A. Allow reasonable time for the seals to adjust
    Explanation
    When a slight leak is noticed on a mechanical seal that has just been installed, the appropriate action to take is to allow reasonable time for the seals to adjust. This is because mechanical seals require some time to settle and form a proper seal. By allowing time for adjustment, the seals may tighten and the leak may stop on its own. Replacing the O-ring or the entire seal immediately may not be necessary if the leak is minor and can potentially resolve itself with time. Restarting the pump or replacing parts may not address the issue and could potentially cause further damage.

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  • 5. 

    (606) Where would you find out which valves have to be isolated before removing a manual valve?

    • Co-workers

    • Shop supervisor

    • As built drawings

    • Air Force standard drawings

    Correct Answer
    A. As built drawings
    Explanation
    As-built drawings are detailed diagrams or blueprints that show the exact layout and configuration of a system or structure as it was constructed. These drawings typically include information about the location and operation of valves, pipes, and other components. Therefore, consulting as-built drawings would provide the necessary information to identify which valves need to be isolated before removing a manual valve. This is because the as-built drawings would accurately depict the current state and arrangement of the valves in the system.

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  • 6. 

    (609) What is the maximum tolerance allowed when aligning an API 610 pump shaft and motor shaft?

    • 0.001 inches

    • 0.002 inches

    • 0.003 inches

    • 0.004 inches

    Correct Answer
    A. 0.002 inches
    Explanation
    When aligning an API 610 pump shaft and motor shaft, the maximum tolerance allowed is 0.002 inches. This means that the misalignment between the two shafts should not exceed 0.002 inches.

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  • 7. 

    (602) How often do you inspect a gate valve for leaks?

    • Weekly

    • Monthly

    • As required

    • Not required

    Correct Answer
    A. As required
    Explanation
    The frequency of inspecting a gate valve for leaks depends on its condition and usage. If there are signs of leaks or if the valve is frequently used, it should be inspected more often, possibly on a weekly or monthly basis. However, if the valve is rarely used and there are no visible signs of leaks, it may not require regular inspections and can be inspected as required. The answer "As required" indicates that the inspection frequency should be determined based on the specific circumstances of the gate valve.

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  • 8. 

    (602) What type packing is used around the valve stems of globe valves?

    • Nylon

    • Viton

    • Teflon string

    • Graphite

    Correct Answer
    A. Teflon string
    Explanation
    Teflon string is used as packing around the valve stems of globe valves. Teflon, also known as polytetrafluoroethylene (PTFE), is a synthetic material that is highly resistant to chemicals, heat, and friction. It is a popular choice for valve stem packing because it provides a tight seal, prevents leaks, and reduces friction between moving parts. Teflon string is flexible and can be easily wrapped around the valve stem to create a reliable seal, making it an ideal choice for globe valves.

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  • 9. 

    (603) A 12-inch non-lubricated plug valve will have what type of operator?

    • Lever

    • Chain

    • Wrench

    • Worm gear

    Correct Answer
    A. Worm gear
    Explanation
    A 12-inch non-lubricated plug valve will have a worm gear operator. A worm gear is a type of gear mechanism that consists of a screw-like gear (worm) and a wheel-like gear (worm wheel). This type of operator provides a high gear ratio, allowing for precise and controlled movement of the valve. It is commonly used in applications where manual operation of the valve is required, especially in cases where lubrication is not possible or recommended.

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  • 10. 

    (605) What type of valve requires the least amount of space?

    • Ball

    • Gate

    • Check

    • Butterfly

    Correct Answer
    A. Butterfly
    Explanation
    Butterfly valves require the least amount of space compared to other types of valves. This is because they have a compact design and a simple mechanism that allows for easy installation and operation. The disc of the butterfly valve is positioned in the center of the pipe, allowing for a straight flow path and minimal obstruction. Additionally, butterfly valves are lightweight and can be installed in tight spaces, making them a preferred choice when space is limited.

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  • 11. 

    (609) What should you do if the centrifugal pump binds after you have replaced parts in the self-priming pump portion a Gilbarco(R) pump?

    • File the rotor

    • File the vanes

    • Add 1/4 inch spacers

    • Add a paper-thin gasket

    Correct Answer
    A. Add a paper-thin gasket
    Explanation
    If the centrifugal pump binds after replacing parts in the self-priming pump portion of a Gilbarco(R) pump, adding a paper-thin gasket can help resolve the issue. This gasket can create a small separation between the parts, allowing them to move freely and preventing binding.

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  • 12. 

    (601) How many basic designs of gate valves are there?

    • 1

    • 2

    • 3

    • 4

    Correct Answer
    A. 2
    Explanation
    rising stem and non-rising stem

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  • 13. 

    (601) During repacking, a gate valve should be placed in what position?

    • Open

    • Closed

    • Either open or closed

    • Intermediate between open and closed

    Correct Answer
    A. Closed
    Explanation
    During repacking, a gate valve should be placed in the closed position. This is because repacking involves replacing the packing material around the valve stem to prevent leakage. By closing the valve, it ensures that the flow of fluid is completely stopped, allowing for safe and effective repacking without any risk of leaks or accidents. Placing the valve in any other position, such as open or intermediate, would not provide the necessary safety and stability required for the repacking process.

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  • 14. 

    (601) For large gate valves, what type of packing is best?

    • Nylon

    • Teflon

    • Graphite

    • Multi-layered cardboard

    Correct Answer
    A. Teflon
    Explanation
    Teflon is the best type of packing for large gate valves. Teflon is known for its excellent chemical resistance, low friction, and high temperature resistance. These properties make it ideal for use in valves where it can provide a tight seal, prevent leaks, and withstand harsh operating conditions. Nylon, graphite, and multi-layered cardboard do not possess the same level of durability and resistance as Teflon, making them less suitable for this application.

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  • 15. 

    (606) How much fuel is in a 22-foot section of 6-inch pipe?

    • 11 gallons

    • 22 gallons

    • 33 gallons

    • 44 gallons

    Correct Answer
    A. 33 gallons
    Explanation
    The amount of fuel in a pipe can be calculated using the formula for the volume of a cylinder. The formula is V = πr^2h, where V is the volume, r is the radius, and h is the height. In this case, the radius is half the diameter, so it is 3 inches. The height is the length of the pipe, which is 22 feet. Converting the measurements to the same unit, we have a radius of 0.25 feet and a height of 22 feet. Plugging these values into the formula, we get V = π(0.25)^2(22) = 33 gallons. Therefore, the correct answer is 33 gallons.

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  • 16. 

    (608) What type of lubricant is used and how is it applied to he Blackmer pump ball bearings?

    • Liquid being pumped; bypass line

    • Liquid being pumped; internal pump pressure

    • Lithium-based grease; Lithium-based grease; grease cup

    • Lithium-based grease; hand-pressure gun

    Correct Answer
    A. Lithium-based grease; hand-pressure gun
    Explanation
    Lithium-based grease is used to lubricate the ball bearings of the Blackmer pump. It is applied using a hand-pressure gun.

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  • 17. 

    (609) What type of impeller in the centrifugal pump is the most efficient and develops the highest pressure?

    • Open

    • Closed

    • Semi-open

    • Combination

    Correct Answer
    A. Closed
    Explanation
    A closed impeller in a centrifugal pump is the most efficient and develops the highest pressure. This is because a closed impeller has a shroud that covers the entire impeller, preventing any fluid from escaping backwards. This design allows for more efficient transfer of energy from the rotating impeller to the fluid, resulting in higher pressure. Additionally, the closed impeller design reduces the risk of cavitation, which can negatively impact pump performance.

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  • 18. 

    (609) What type of pump is the API 610 pump?

    • Single stage centrifugal, radial split case, with end suction and discharge

    • Dual stage centrifugal, radial split case, with end suction and discharge

    • Single stage centrifugal, radial split case, with end suction and top discharge

    • Dual stage centrifugal, radial split case, with end suction and top discharge

    Correct Answer
    A. Single stage centrifugal, radial split case, with end suction and top discharge
    Explanation
    The API 610 pump is a single stage centrifugal pump with a radial split case design. It has an end suction and top discharge configuration.

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  • 19. 

    (612) What is the standard opening rate for the 81AF-8, nonsurge check valve?

    • 10 seconds

    • 20 seconds

    • 30 seconds

    • 40 seconds

    Correct Answer
    A. 20 seconds
    Explanation
    The standard opening rate for the 81AF-8, nonsurge check valve is 20 seconds. This means that it takes approximately 20 seconds for the valve to fully open once it is activated.

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  • 20. 

    (606) The system configuration that would not require you to manually bleed air out of the pipeline after a valve is replaced involves pumping

    • Through a meter

    • Though a fill stand

    • Though a filter/separator

    • Directly into a storage tank

    Correct Answer
    A. Directly into a storage tank
    Explanation
    Directly pumping into a storage tank would not require manual bleeding of air out of the pipeline after a valve is replaced. This is because the storage tank acts as a reservoir where any air can naturally rise to the top and be vented out, without the need for manual intervention. Pumping through a meter, fill stand, or filter/separator would not provide the same capability to release trapped air, hence manual bleeding would be required in those cases.

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  • 21. 

    (612) When reverse flow occurs to an 81AF08, nonsurge check valve, how does fuel get to the cover chamber of the hytrol check valve?

    • Through a drilled passage

    • Through a pin hole in the hytrol check valve diaphragm

    • Tubing connected from the inlet of the main valve to the cover chamber of the hytrol check

    • Tubing connected from the outlet of the main valve to the cover chamber of the hytrol check

    Correct Answer
    A. Through a drilled passage
    Explanation
    When reverse flow occurs to an 81AF08, nonsurge check valve, fuel gets to the cover chamber of the hytrol check valve through a drilled passage.

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  • 22. 

    (616) What information must be recorded on a filter/separator after the elements are changed?

    • Next due date and minimum allowable differential pressure

    • Next due date and maximum allowable differential pressure

    • Installation date and minimum allowable differential pressure

    • Installation date and maximum allowable differential pressure

    Correct Answer
    A. Next due date and maximum allowable differential pressure
    Explanation
    After changing the elements of a filter/separator, it is important to record the next due date for when the elements need to be changed again. This ensures that the filter/separator is properly maintained and the elements are replaced at the appropriate time. Additionally, the maximum allowable differential pressure should be recorded. This is the maximum pressure difference that the filter/separator can handle before it needs to be serviced or replaced. Recording this information helps monitor the performance of the filter/separator and ensures it is operating within safe limits.

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  • 23. 

    (606) What specialized equipment must you have to ensure system integrity when removing a valve from the system?

    • Locks

    • Drip pans

    • Blind flanges

    • As built drawings

    Correct Answer
    A. Blind flanges
    Explanation
    Blind flanges are specialized equipment that must be used to ensure system integrity when removing a valve from the system. Blind flanges are solid disks used to close off a pipeline or vessel opening. They are designed to prevent any flow through the system while maintenance or repairs are being carried out. By using blind flanges, the system is effectively sealed and protected from any potential leaks or contamination during the valve removal process.

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  • 24. 

    (607) The main difference between the internal gear pump and the external gear pump lies in

    • The size of the pumping chamber

    • The amount of pressure applied

    • Where the fuel flows

    • The number of gears

    Correct Answer
    A. Where the fuel flows
    Explanation
    The main difference between the internal gear pump and the external gear pump lies in where the fuel flows. In an internal gear pump, the fuel flows between the teeth of the gears and the inner surface of the pump housing. On the other hand, in an external gear pump, the fuel flows between the teeth of the gears and the outer surface of the pump housing. This difference in flow path affects the efficiency and performance of the pumps.

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  • 25. 

    (603) What position must a General Twin Seal plug valve be in so that you can remove the valve operator?

    • Open

    • Closed

    • Either open or closed

    • Intermediate between open and closed

    Correct Answer
    A. Closed
    Explanation
    To remove the valve operator of a General Twin Seal plug valve, the valve must be in the closed position. This is because in the closed position, the plug is fully engaged with the valve seat, creating a tight seal and preventing any flow through the valve. By removing the valve operator in this position, maintenance or repairs can be performed without any risk of leakage or flow.

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  • 26. 

    (606) When reinstalling a manual valve, which bolts should you insert first?

    • Top

    • Bottom

    • Left side

    • Right side

    Correct Answer
    A. Bottom
    Explanation
    When reinstalling a manual valve, it is recommended to insert the bottom bolts first. This is because the weight of the valve can be better supported when the bottom bolts are secured first. By starting with the bottom bolts, it ensures that the valve is properly aligned and positioned before securing the remaining bolts on the top, left side, and right side.

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  • 27. 

    (608) What is used to remove the seals and bearings from the head of a rotary-vane type pump?

    • Mallet

    • Pliers

    • Screwdriver

    • Gear puller

    Correct Answer
    A. Screwdriver
    Explanation
    A screwdriver is used to remove the seals and bearings from the head of a rotary-vane type pump. This tool is commonly used to loosen and remove screws or fasteners. In the context of a pump, a screwdriver can be used to unscrew and remove the components that hold the seals and bearings in place, allowing for their removal and replacement if necessary.

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  • 28. 

    (603) What type of valve does not have to be removed from the pipeline during hydrostatic testing?

    • Ball valve

    • Gate valve

    • Resilient liner plug valve

    • Double block and bleed plug valve

    Correct Answer
    A. Double block and bleed plug valve
    Explanation
    A double block and bleed plug valve is designed in such a way that it can isolate the pipeline on both sides of the valve, and also has a bleed valve to release any trapped pressure between the two blocks. This means that during hydrostatic testing, the valve does not need to be removed from the pipeline as it can effectively isolate the section being tested and also release any pressure if needed.

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  • 29. 

    (606) Whom must you notify before you work on a fuel system that could interfere with the base flying mission?

    • Wing safety

    • Base operations

    • Resource control center

    • Command fuels engineer

    Correct Answer
    A. Resource control center
    Explanation
    Before working on a fuel system that could interfere with the base flying mission, you must notify the Resource Control Center. This is because the Resource Control Center is responsible for managing and coordinating the use of resources, including fuel, on the base. They need to be informed about any work that could potentially affect the availability or functionality of the fuel system to ensure that it does not disrupt the base's flying mission.

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  • 30. 

    (616) If a fuel system has a maximum operating pressure of 125psi, at what psi should the filter/separator pressure relief be set?

    • 132.5

    • 135

    • 137.5

    • 142

    Correct Answer
    A. 137.5
    Explanation
    The filter/separator pressure relief should be set at 137.5 psi. This is because the maximum operating pressure of the fuel system is 125 psi, and the pressure relief should be set slightly higher than this to ensure that it activates before the system reaches its maximum pressure. 137.5 psi provides a safety margin while still allowing the system to operate within its designated limits.

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  • 31. 

    (604) How often do ball valves have to be inspected for ease of operation and leaks?

    • Weekly

    • Monthly

    • Quarterly

    • As required

    Correct Answer
    A. As required
    Explanation
    Ball valves do not have a specific inspection schedule as their frequency of inspection depends on their usage and condition. They should be inspected for ease of operation and leaks whenever there are signs of malfunction or when routine maintenance is being conducted. The frequency of inspection may vary based on factors such as the type of fluid being controlled, the environment in which the valve is installed, and the manufacturer's recommendations. Therefore, ball valves should be inspected as required, rather than on a fixed schedule.

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  • 32. 

    (616) When removing the KMU-416/F modification kit with nine additional elements, how many elements must you remove from the front side to balance the manifold?

    • 3

    • 6

    • 9

    • 15

    Correct Answer
    A. 6
    Explanation
    When removing the KMU-416/F modification kit with nine additional elements, you need to remove six elements from the front side to balance the manifold. This means that there were originally six elements on the front side that needed to be balanced out by the nine additional elements from the modification kit. By removing six elements, the front side will be balanced again.

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  • 33. 

    (610) The number of column-shaft sections a deep-well turbine will have is determined by the

    • Capacity of a tank

    • Pump output capacity

    • Distance between the tank roof and tank bottom

    • Distance between the pump tank flange and the tank floor

    Correct Answer
    A. Distance between the pump tank flange and the tank floor
    Explanation
    The number of column-shaft sections a deep-well turbine will have is determined by the distance between the pump tank flange and the tank floor. This is because the column-shaft sections need to be long enough to reach from the pump tank flange to the tank floor in order to properly function. If the distance between these two points is too large, more column-shaft sections will be needed to cover the distance. Conversely, if the distance is smaller, fewer column-shaft sections will be required. Therefore, the distance between the pump tank flange and the tank floor directly affects the number of column-shaft sections needed.

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  • 34. 

    (613) The newest filter/separator modification requires how many cartridges total for a 600-gpm filter/separator?

    • 15

    • 20

    • 25

    • 30

    Correct Answer
    A. 30
    Explanation
    The newest filter/separator modification requires a total of 30 cartridges for a 600-gpm filter/separator. This suggests that the modification involves a significant increase in the number of cartridges compared to previous versions. The higher number of cartridges is likely necessary to effectively filter and separate the fuel at a flow rate of 600 gallons per minute.

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  • 35. 

    (614) Coalescers in an API 1581 filter/seperator are rated for what minimum gpm per nch of length?

    • 1.27

    • 2.27

    • 7.33

    • 8.33

    Correct Answer
    A. 2.27
    Explanation
    The correct answer is 2.27. Coalescers in an API 1581 filter/seperator are rated for a minimum flow rate of 2.27 gallons per minute (gpm) per inch of length. This means that for every inch of coalescer length, a minimum flow rate of 2.27 gpm should be maintained to ensure efficient coalescing of liquid contaminants.

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  • 36. 

    (616) When gravity-filling a horizontal filter/separator from another horizontal filter separator how many minutes must you wait for the two filter/separators to equalize?

    • 5

    • 10

    • 15

    • 20

    Correct Answer
    A. 10
    Explanation
    When gravity-filling a horizontal filter/separator from another horizontal filter separator, it takes approximately 10 minutes for the two filter/separators to equalize. During this time, the liquid levels in both filter/separators will balance out, ensuring a consistent flow of liquid between the two.

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  • 37. 

    (613) When the float in a vertical filter/separator raises to the TOP position, what happens?

    • The water drain valve closes

    • The fuel discharge valve closes

    • The nonsurge check valve opens

    • Nothing, fuel is allowed to flow normally

    Correct Answer
    A. The fuel discharge valve closes
    Explanation
    When the float in a vertical filter/separator raises to the TOP position, the fuel discharge valve closes. This is because the float rising to the top indicates that the filter/separator has reached its maximum capacity and needs to be emptied. Closing the fuel discharge valve prevents any further fuel from flowing out and ensures that the fuel remains in the filter/separator until it can be drained.

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  • 38. 

    (617) What is the normal flow of fuel through a strainer?

    • Outside-to-center

    • Center-to-outside

    • Outside-to-center-to-outside

    • Center-to-Outside-to-center

    Correct Answer
    A. Center-to-outside
    Explanation
    The normal flow of fuel through a strainer is from the center to the outside. This means that the fuel enters the strainer through the center and then flows outwards towards the edges of the strainer. This flow direction helps to filter out any contaminants or debris present in the fuel, ensuring that only clean fuel reaches the engine.

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  • 39. 

    (602) The manual valve that can be repacked while the line is under pressure is the

    • Ball

    • Globe

    • Resilient-liner plug

    • Moveable seat plug

    Correct Answer
    A. Globe
    Explanation
    A globe valve is the manual valve that can be repacked while the line is under pressure. This is because a globe valve has a disc that moves perpendicular to the flow of the fluid, allowing for easy repacking of the valve while the line is still pressurized. In contrast, other types of valves such as ball valves or plug valves require the line to be depressurized before repacking can be done.

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  • 40. 

    (612) To speed up the opening time of an 81AF, nonsurge check valve, you must turn the check valve (CV) flow control adjusting screw

    • Counterclockwise to increase

    • Counterclockwise to decrease

    • Clockwise to increase

    • Clockwise to decrease

    Correct Answer
    A. Clockwise to increase
    Explanation
    To speed up the opening time of an 81AF, nonsurge check valve, you must turn the check valve (CV) flow control adjusting screw clockwise to increase. This means that by turning the screw in a clockwise direction, the flow control will be increased, resulting in a faster opening time for the check valve.

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  • 41. 

    (605) What type of valve must be fully closed before you can remove it from the pipeline?

    • Ball

    • Gate

    • Butterfly

    • Non-lubricated plug

    Correct Answer
    A. Butterfly
    Explanation
    A butterfly valve must be fully closed before it can be removed from the pipeline. This is because a butterfly valve operates by rotating a disc in the pipeline to control the flow of fluid. In order to remove the valve, the disc needs to be in the closed position to prevent any leakage or flow of fluid. Once the valve is fully closed, it can be safely removed from the pipeline for maintenance or replacement.

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  • 42. 

    (608) What type of pump has a build-in pressure control valve?

    • Rotary-vane type

    • External gear

    • Deep-well turbine

    • Centrifugal

    Correct Answer
    A. Rotary-vane type
    Explanation
    A rotary-vane type pump has a built-in pressure control valve. This type of pump uses rotating vanes to create suction and move fluid. The built-in pressure control valve helps regulate the pressure within the pump, preventing it from exceeding a certain level. This feature is useful in applications where maintaining a specific pressure is important, such as in hydraulic systems or fuel delivery systems.

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  • 43. 

    (609) If a centrifugal pump develops 600gpm at 350 feet of head, how much psi is developed at 600gpm when pumping JP-8?

    • 12.3 psi

    • 34

    • 3.3

    • 123

    Correct Answer
    A. 123
  • 44. 

    (612) Which of the following conditions would cause the 81AF, nonsurge check valve, to open too rapidly or have no control of the opening rate?

    • A loose diaphragm washer

    • Air in the main cover chamber

    • A swing check valve disc stuck off its seat

    • An obstruction between the disc and the seat of the main valve

    Correct Answer
    A. A swing check valve disc stuck off its seat
    Explanation
    If the swing check valve disc is stuck off its seat, it means that the disc is not properly seated and is not able to control the flow of fluid. This can cause the valve to open too rapidly or have no control over the rate of opening. When the disc is stuck off its seat, it can allow the fluid to flow freely without any restriction, leading to rapid or uncontrolled opening of the valve.

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  • 45. 

    (616) The new CF21 flange differs from the old pilot valve assembly in that it

    • Has two supply lines

    • Uses an external float

    • Does not use a Y strainer

    • Has a float that floats on fuel

    Correct Answer
    A. Has a float that floats on fuel
    Explanation
    The new CF21 flange differs from the old pilot valve assembly in that it has a float that floats on fuel. This means that the float is designed to stay on the surface of the fuel, allowing for better control and regulation of the fuel flow. This is a significant difference from the old pilot valve assembly, which may have had a different type of float or mechanism for controlling the fuel flow.

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  • 46. 

    (603) How often do non-lubricated plug valve have to be inspected for ease operation and leaks?

    • Weekly

    • Monthly

    • Annually

    • As required

    Correct Answer
    A. As required
    Explanation
    Non-lubricated plug valves do not require regular inspections for ease of operation and leaks like lubricated valves. Instead, they need to be inspected and maintained as required based on their specific usage and operating conditions. This means that the frequency of inspections will depend on factors such as the valve's age, usage, environment, and any signs of potential issues. Regular monitoring and maintenance are necessary to ensure optimal performance and prevent any potential leaks or operational difficulties.

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  • 47. 

    (605) To conform to API Standard 6D, the seat and disc of which valve must be removable without removing the valve from the pipeline?

    • Gate

    • Plug

    • Globe

    • Check

    Correct Answer
    A. Check
    Explanation
    In order to conform to API Standard 6D, the seat and disc of a Check valve must be removable without removing the valve from the pipeline. This means that the Check valve can be maintained and repaired without having to shut down the entire pipeline system. Gate, Plug, and Globe valves do not have this specific requirement, so they would not be the correct answer in this case.

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  • 48. 

    (609) At what rate will a Gillarco(R) self priming pump remove air?

    • 18 inches per minute

    • 28 inches per minute

    • 18 gallons per minute

    • 28 gallons per minute

    Correct Answer
    A. 18 gallons per minute
    Explanation
    A Gillarco self-priming pump is capable of removing air at a rate of 18 gallons per minute. This means that the pump is able to effectively remove air from a system or container at a speed of 18 gallons per minute. This rate is important in applications where air removal is necessary, such as in water or fluid transfer systems, to ensure efficient and effective operation.

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  • 49. 

    (612) What would cause the 81AF-8, nonsurge check valve to fail to open?

    • Loose diaphragm washer

    • Hytrol check installed backwards

    • Closed downstream manual valve

    • Air in the main valve cover chamber

    Correct Answer
    A. Closed downstream manual valve
    Explanation
    If the downstream manual valve is closed, it will prevent the flow of fluid or air, causing the 81AF-8 nonsurge check valve to fail to open. The downstream manual valve acts as a barrier, blocking the passage of fluid or air and preventing it from reaching the check valve. As a result, the check valve cannot open and allow the flow to pass through.

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  • Current Version
  • Jul 15, 2024
    Quiz Edited by
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  • Sep 26, 2010
    Quiz Created by
    JiminyCricket

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