3e451 Volume 3 Operation And Maintenance Of Hydrant Systems And Components

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1. (405) Approximately how long do you want it to take the fueling valve to open when you adjust the CV flow control on the 302AF fueling and defueling valve?

Explanation

The CV flow control on the 302AF fueling and defueling valve is used to adjust the time it takes for the fueling valve to open. The question asks for the approximate duration desired for the fueling valve to open when the CV flow control is adjusted. The correct answer is 20 seconds, indicating that this is the desired time for the valve to open when the CV flow control is adjusted.

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About This Quiz
Air Force Quizzes & Trivia

This quiz assesses knowledge in the operation and maintenance of hydrant systems within the Air Force, focusing on control mechanisms, system diagnostics, and troubleshooting common issues. It is essential for personnel involved in direct fuel handling and infrastructure maintenance.

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2. (401) What positions are on the pump control switch?

Explanation

The pump control switch has three positions: hand, off, and auto. The hand position allows manual control of the pump, the off position turns the pump off, and the auto position enables automatic control of the pump. Therefore, the correct answer is hand/off/auto.

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3. (402) Most emergency service calls involve

Explanation

Most emergency service calls involve no fuel delivery. This is because a lack of fuel can cause a vehicle or equipment to stop functioning, leading to an emergency situation. Without fuel, engines cannot operate, resulting in breakdowns or failures. This is a common issue that requires immediate attention from emergency services to ensure the safety and well-being of individuals involved.

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4. (414) What type of ground rods are hydrant outlets grounded to in the piping system of the type 2 hydrant system?

Explanation

In the piping system of a type 2 hydrant system, hydrant outlets are grounded to galvanized/stainless steel ground rods. Grounding the hydrant outlets to these types of rods helps to ensure that any electrical currents or faults are safely directed into the ground, preventing damage to the system and reducing the risk of electrical shock or fire hazards. Tin, black steel, and cast iron are not typically used for grounding rods in this type of system.

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5. (404) The primary purpose of the orifice plate on the 302AF fueling and defueling valve is to create differential

Explanation

The orifice plate on the 302AF fueling and defueling valve is primarily used to create differential pressure to operate the CDHS-3. This means that the orifice plate helps to generate a pressure difference between two points, which is necessary for the CDHS-3 to function properly. It is not used for creating flow or operating the CDHS-2, as stated in the other options.

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6. (426) The type III system must be flushed

Explanation

The correct answer is "When it is not used in 30 days." This means that the type III system, which is presumably a specific system or equipment, needs to be flushed if it has not been used for a period of 30 days. This flushing process is likely necessary to ensure that the system remains in proper working condition and to prevent any potential issues or malfunctions that could arise from prolonged periods of inactivity.

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7. (432) What switch, on the type IV pump control panel, looks like a red mushroom

Explanation

The correct answer is "Emergency stop." On the type IV pump control panel, there is a switch that resembles a red mushroom. This switch is known as the emergency stop switch. It is designed to quickly and easily shut down the system in case of an emergency or malfunction. By pressing this switch, all operations of the pump control panel will be immediately halted, ensuring safety and preventing any further damage or harm.

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8. (408) If the cover chamber pressure on the 90AF-8 refueling control valve stays between the inlet and outlet pressure, the valve

Explanation

If the cover chamber pressure on the 90AF-8 refueling control valve stays between the inlet and outlet pressure, the valve modulates. This means that the valve adjusts the flow of fluid or gas by varying the size of the opening. It does not fully open or close, but instead regulates the flow to maintain a steady pressure within the desired range.

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9. (404) A damaged diaphragm on the pressure reducing control is indicated by?

Explanation

A damaged diaphragm on the pressure reducing control can cause a fuel leakage from the vent port. When the diaphragm is damaged, it may not be able to properly regulate the pressure, leading to excess pressure buildup. This excess pressure can cause fuel to leak from the vent port, indicating a problem with the diaphragm.

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10. (401) The pressure/flow recorder indicates which of the following?

Explanation

The pressure/flow recorder indicates system pressure and issue/return flow rates. This means that the recorder is able to measure and display the pressure within the system, as well as the flow rates of the fluid being issued and returned. This information is important for monitoring and analyzing the performance of the system, as well as identifying any potential issues or abnormalities in the flow rates.

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11. (424) What happens if the third pump is called on automatically in a type III system and fails to start?

Explanation

If the third pump fails to start in a type III system, the next pump in the predetermined sequence will be automatically called on. This means that the system will move on to the fourth pump and attempt to start it.

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12. (403) How many hydrant outlets are served by each panero pit?

Explanation

Each panero pit serves only one hydrant outlet.

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13. (404) What component closes the main valve of the 302AF fueling/defueling valve when there is excess flow at the hydrant outlet?

Explanation

The CDHS-3 component closes the main valve of the 302AF fueling/defueling valve when there is excess flow at the hydrant outlet.

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14. (408) What happens to the auxiliary hytrols A and B, on the 90AF-8 refueling control valve, when excess flow trips the CDHS-3 pressure differential control?

Explanation

When the CDHS-3 pressure differential control detects excess flow, it trips and activates a mechanism that causes auxiliary hytrol A to open and auxiliary hytrol B to close.

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15. (422) What does the first symbol in a rung of ladder logic represent?

Explanation

The first symbol in a rung of ladder logic represents contacts. Contacts are used to represent the input conditions or events that must be true in order for the rung to be active. They can be normally open (NO) or normally closed (NC) and are used to control the flow of current in the ladder logic circuit.

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16. (406) To remedy a leakage on the Philidelphia hydrant adapter, which one of the following would you usually replace?

Explanation

To remedy a leakage on the Philadelphia hydrant adapter, the most common component that would need to be replaced is the flange gasket. The flange gasket is responsible for creating a tight seal between two connecting parts, in this case, the hydrant adapter and the hydrant. If there is a leakage, it indicates that the flange gasket is worn out or damaged and needs to be replaced to restore the proper seal and prevent further leakage.

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17. (407) How many manual valves are found in the lateral control pit of the Pritchard system?

Explanation

In the lateral control pit of the Pritchard system, there are three manual valves.

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18. (430) What type fueling pumps are used in a type IV cut and cover tank?

Explanation

Deep well turbine pumps are used in a type IV cut and cover tank. These pumps are capable of pumping fuel at a rate of 600 gallons per minute (gpm). They are specifically designed for deep well applications and are commonly used in underground storage tanks. The use of deep well turbine pumps ensures efficient and reliable fueling operations in the tank. Horizontal centrifugal pumps, on the other hand, are not suitable for this type of tank as they are not designed for deep well applications. Additionally, the 1200 gpm option is incorrect as it exceeds the specified pumping capacity for this type of tank.

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19. (407) What lateral control pit component automatically cuts off the defuel pump when a predetermined amount of inches of mercury is reached?

Explanation

The vacuum control switch is the correct answer because it automatically cuts off the defuel pump when a predetermined amount of inches of mercury is reached. This switch is responsible for controlling the flow of vacuum to various components in the lateral control pit, including the defuel pump. Once the predetermined amount of inches of mercury is reached, the switch activates and shuts off the pump to prevent any further fueling and maintain safety.

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20. (422) How long will the back-up battery maintain the type III microprocessors memory?

Explanation

The back-up battery will maintain the type III microprocessor's memory for a minimum of 30 days. This means that even if there is a power outage or the main power source fails, the back-up battery will ensure that the memory of the microprocessor remains intact for at least 30 days.

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21. (426) To flush a type III system, you must turn the selector switch on the pump control panel to

Explanation

To flush a type III system, the correct procedure is to turn the selector switch on the pump control panel to "Flush" and all available pump switches to "hand". This means that the system will be manually operated by hand pumps during the flushing process. The "Flush" setting ensures that the system is in the correct mode for flushing, and using all available pump switches to "hand" ensures that all pumps are manually operated to flush the system thoroughly.

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22. (420) Defining temperature rating for motors used with fueling pumps in the type III system is the responsibility of the

Explanation

The National Fire Protection Agency 70 is responsible for defining the temperature rating for motors used with fueling pumps in the type III system.

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23. (424) What happens to the lead, second, third, and fourth pump when the issue venturi senses 2400 gpm and the return venturi senses 1000 gpm for 15 seconds?

Explanation

When the issue venturi senses 2400 gpm and the return venturi senses 1000 gpm for 15 seconds, it indicates that there is an excess flow in the system. In order to balance the flow and prevent damage, the fourth pump is called off. This helps to regulate the flow and maintain stability in the pumping system.

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24. (413) What is the probable cause when the 41AF-10 main valve opens during refueling?

Explanation

The probable cause when the 41AF-10 main valve opens during refueling is leakage through the normally closed solenoid valve. This means that the solenoid valve, which is supposed to be closed during refueling, is experiencing leakage and allowing fuel to pass through it. This can lead to unintended opening of the main valve and potentially cause safety hazards during refueling operations.

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25. (432) What do blue lines on the type IV pump control panel graphic display represent?

Explanation

The blue lines on the type IV pump control panel graphic display represent the pump discharge and fueling loop. This means that these lines indicate the path through which the fuel is pumped out and circulated for fueling purposes.

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26. (419) At what full percentage does the overfill valve close in the product recovery tank in a type III system?

Explanation

In a type III system, the overfill valve in the product recovery tank closes at a full percentage of 80. This means that when the tank reaches 80% capacity, the overfill valve will automatically shut off to prevent any further filling and avoid overfilling the tank.

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27. (420) What millampere (mA) signal does the differential pressure transmitter send when 1200 gallons per minute flows through the issue venturi in the type III system

Explanation

The differential pressure transmitter sends a milliampere (mA) signal that corresponds to the flow rate through the venturi in the type III system. In this case, when 1200 gallons per minute flows through the venturi, the transmitter sends a signal of 12 mA.

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28. (421) The 352AF-8 hydrant control valve opens when an aircraft is refueling. It opens by using the

Explanation

The correct answer is the pneumatic deadman. The pneumatic deadman is a safety device that is used to control the flow of fuel during refueling operations. It is designed to automatically shut off the flow of fuel if the operator releases the deadman handle or if there is a loss of pressure in the system. This helps to prevent overfilling or fuel spills, ensuring the safety of the aircraft and personnel involved in the refueling process.

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29. (421) Solenoid "B" on the 58AF-9-1 defuel/flush valve energizes to allow the main valve to open only when the

Explanation

When the system is placed in the flush mode, solenoid "B" on the 58AF-9-1 defuel/flush valve energizes. This energization allows the main valve to open, enabling the flushing process to occur. The other options, such as manually starting the fueling pumps or placing the system in automatic mode, do not directly relate to the energization of solenoid "B" or the opening of the main valve.

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30. (417) What type steel is used in the control tubing of the type III system?

Explanation

Stainless steel is the correct answer for the type of steel used in the control tubing of the type III system. Stainless steel is a durable and corrosion-resistant material that is commonly used in various industries, including oil and gas. It is preferred for control tubing as it can withstand high pressure and temperature conditions, ensuring the safe and efficient operation of the system. Copper, carbon, and galvanized steel are not suitable for control tubing in this context as they do not possess the same level of corrosion resistance and strength as stainless steel.

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31. (419) Where is the ball float for the 413AF-5A high-level shut-off valve on an operating storage tank located?

Explanation

The ball float for the 413AF-5A high-level shut-off valve is located on the exterior side of the tank at the required shut-off height. This means that the float is positioned outside of the tank, at a specific height that allows it to effectively shut off the valve when the tank reaches a certain level. Placing the float on the exterior side of the tank ensures that it is easily accessible for maintenance and inspection purposes.

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32. (419) A type III operating storage tank level indicator servo compartment must be approved for hazardous locations and listed for use in class I

Explanation

The correct answer is Division I, Group D. This is because a type III operating storage tank level indicator servo compartment must be approved for hazardous locations and listed for use in class I, division I. Division I indicates that the hazardous material is present continuously or intermittently during normal operations, and Group D represents a hazardous material that is a flammable gas or vapor. Therefore, Division I, Group D is the appropriate classification for the operating storage tank level indicator servo compartment.

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33. (428) What size mesh screen is used in the receiving strainer of a type IV system?

Explanation

The correct answer is 60. In a type IV system, the receiving strainer uses a mesh screen with a size of 60. This size is specifically chosen to allow the desired amount of liquid to pass through while filtering out any larger particles or debris that could potentially clog the system or cause damage. A mesh screen with a smaller size would restrict the flow too much, while a larger size would allow too many particles to pass through. Therefore, a size of 60 is the appropriate choice for the receiving strainer in a type IV system.

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34. (407) When you place a magnet on the defuel magnetic control switch, during defueling, the solenoid on the

Explanation

When you place a magnet on the defuel magnetic control switch, it activates the defueling control valve and the defueling pump. This allows for the fuel to be pumped out of the system and into a separate container or storage tank. The activation of these components ensures that the defueling process can occur smoothly and efficiently.

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35. (420) Each issue filter separator in the type III system is rated for how many gallons per minute?

Explanation

Each issue filter separator in the type III system is rated for 600 gallons per minute.

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36. (423) To set up the pump control panel for fueling on the type III system, after selecting the lead pump, you then place the system in

Explanation

To set up the pump control panel for fueling on the type III system, the correct procedure is to select the lead pump first. After that, the system should be placed in automatic mode, which allows for automatic control of the pump. Finally, the SYSTEM START button should be pushed to initiate the fueling process.

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37. (408) The pressure relief control, on the 90AF-8 is set to

Explanation

The pressure relief control on the 90AF-8 is set to 5 pounds per square inch (psi) higher than the normal operating pressure. This means that when the pressure in the system exceeds the normal operating pressure, the relief control will activate and release the excess pressure to maintain the system within safe limits. By setting the relief pressure 5 psi higher than the normal operating pressure, it ensures that the relief control will only activate when necessary and prevent any potential damage or failure in the system.

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38. (409) Which of the following would probably cause the 90AF-8 refueling control valve to open, then close?

Explanation

The CDHS-3 tripping would probably cause the 90AF-8 refueling control valve to open, then close. The CDHS-3 is a system that monitors and controls various functions in the refueling process. If it trips, it indicates a malfunction or abnormal condition, which could lead to the valve opening and then closing as a safety measure to prevent any further issues or damage.

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39. (410) Which statement best describes what is removed from the strainer orifice used on the 50AF-2 pressure relief valve?

Explanation

The strainer orifice used on the 50AF-2 pressure relief valve removes only the primary jet. The primary jet is the main flow of fluid that passes through the orifice. The secondary jet, on the other hand, is not removed. Therefore, the correct answer is that only the primary jet is removed from the strainer orifice.

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40. (414) When defueling stops, the 352AF hydrant adapter controls its own fuel level in order to

Explanation

The 352AF hydrant adapter controls its own fuel level in order to prevent air from entering the installed piping system. This is important because air can cause disruptions in the fuel flow and can lead to issues such as fuel starvation or airlock. By maintaining a consistent fuel level, the hydrant adapter ensures that only fuel is present in the system, preventing any air from entering and potentially causing damage or disruptions in the fuel supply.

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41. (419) What size piping is used to connect the pressure reliefs and other drains to the product recovery tank in a type III system?

Explanation

In a type III system, the pressure reliefs and other drains are connected to the product recovery tank using 2-inch piping. This size of piping is necessary to ensure the efficient flow and drainage of fluids from the system. Smaller sizes like 1/2-inch or 1-inch may not be sufficient to handle the volume of fluids and could result in clogging or inadequate drainage. Similarly, a 1 1/2-inch pipe may be too small for optimal flow, while a 2-inch pipe provides the necessary capacity for proper drainage.

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42. (404) When operating normally, what part of the 302AF fueling/defueling valve restricts the flow of fuel in the control tubing and will not close?

Explanation

The pressure-reducing control is the part of the 302AF fueling/defueling valve that restricts the flow of fuel in the control tubing and will not close when operating normally.

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43. (421) At what pressure, in pounds per square inch, does the 58AF-9 back pressure control valve open to control the hydrant loop pressure?

Explanation

The correct answer is 100 at the farthest hydrant outlet. This means that the 58AF-9 back pressure control valve will open to control the hydrant loop pressure when the pressure at the farthest hydrant outlet reaches 100 pounds per square inch.

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44. (414) After activating an emergency stop switch at the type 2 hydrant outlet, you reset the system to refuel by

Explanation

After activating the emergency stop switch at the type 2 hydrant outlet, the system needs to be manually reset. This manual reset is done in the pumphouse control room. This means that the controls in the pumphouse control room need to be adjusted or reset in order to resume the refueling process.

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45. (412) What condition exists when fuel leaks past the 134AF main valve disc and seat?

Explanation

When fuel leaks past the 134AF main valve disc and seat, the defuel pump rotates slowly during refueling.

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46. (406) What components are magnetized when you place a magnet on the refuel contact points at the hydrant on the modified panero system?

Explanation

When a magnet is placed on the refuel contact points at the hydrant on the modified panero system, the components that are magnetized are the deep-well turbine pump and the 302AF electrical solenoid.

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47. (620) When the two solenoids on the 136AF-9B emergency shut-off valve are energized, what happens to the valve?

Explanation

When the two solenoids on the 136AF-9B emergency shut-off valve are energized, the valve does not open or close, but rather it free floats. This means that it is not fixed in either the open or closed position, but can move freely based on the conditions and pressure in the system.

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48. (419) When fuel reaches the high-high level alarm setting, the high-high level alarm window on the pump control panel (PCP) is activated on a type III operating storage tank. How do you see and hear the warnings?

Explanation

When fuel reaches the high-high level alarm setting on a type III operating storage tank, the pump control panel (PCP) will flash to visually indicate the warning. Additionally, a resonating horn will sound to audibly alert the operator of the high-high level alarm. This combination of flashing PCP and resonating horn sounds allows for both visual and auditory warnings to be received by the operator.

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49. (419) What size is the product recovery tank?

Explanation

The product recovery tank has a size of 4,000 gallons.

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50. (405) The first adjustment you make , when setting the pressure on a 302AF fueling and defueling valve, is establishing a pressure gauge reading of 10 psi above the desired delivery pressure. You do this by turning the adjustment screw on the

Explanation

When setting the pressure on a 302AF fueling and defueling valve, the first adjustment you make is to establish a pressure gauge reading of 10 psi above the desired delivery pressure. This is done by turning the adjustment screw on the pressure-reducing control (CRD) clockwise.

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51. (416) According to the troubleshooting guide, Which component has failed if fuel is bypassed during a fueling operation?

Explanation

If fuel is bypassed during a fueling operation, it means that the solenoid failed to energize. The solenoid is responsible for controlling the flow of fuel, and if it fails to energize, it will not allow fuel to pass through, resulting in fuel bypassing the system. Therefore, the correct answer is solenoid failed to energize.

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52. (429) When does the high level light go out once the operator has acknowledged an activated alarm on a type IV underground operating storage tank?

Explanation

The high level light on a type IV underground operating storage tank goes out when fuel is removed to below the high level alarm setting. This means that once the fuel level drops below the point that triggers the high level alarm, the light indicating the alarm will turn off.

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53. (434) During aircraft refueling, as demand for fuel flowing through the 362AF-7 refueling control valve decreases in a type IV system, flow increases through the

Explanation

As demand for fuel flowing through the 362AF-7 refueling control valve decreases in a type IV system, flow increases through the return venturi. This is because the return venturi is designed to handle excess fuel that is not needed for refueling the aircraft. When the demand for fuel decreases, the excess fuel is diverted through the return venturi to ensure that the fuel system remains balanced and does not become overloaded.

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54. (405) What delivery pressure causes the fueling side, of the 302AF  fueling and defueling valve, to close when turning the adjustment screw on the loading pressure relief controller counterclockwise?

Explanation

When the adjustment screw on the loading pressure relief controller is turned counterclockwise, it decreases the normal operating pressure. Therefore, the fueling side of the 302AF fueling and defueling valve will close when the delivery pressure is 5 psi above the new, lower normal operating pressure.

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55. (411) How often should you check the 50AF-2 pressure relief valve to its opening and relieving pressure?

Explanation

The pressure relief valve should be checked semi-annually to ensure that it is functioning properly and relieving pressure as needed. Checking the valve on a regular basis helps to prevent any potential pressure buildup that could lead to equipment damage or safety hazards. By checking the valve semi-annually, any issues or malfunctions can be identified and addressed in a timely manner, ensuring the continued safe operation of the system.

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56. (413) Which component on the 41AF rate-of-flow control valve causes the main valve to throttle?

Explanation

The differential control is the component on the 41AF rate-of-flow control valve that causes the main valve to throttle. The differential control is responsible for regulating the flow of fluid through the valve by adjusting the position of the main valve. It senses the pressure difference between the inlet and outlet of the valve and uses this information to modulate the opening of the main valve, thereby controlling the rate of flow.

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57. (414) At what maximum differential pressure, in pounds per square inch (psi) does the 352AF hydrant adapters automatic bypass valve open?

Explanation

The correct answer is 35. This means that the automatic bypass valve of the 352AF hydrant adapters opens at a maximum differential pressure of 35 pounds per square inch (psi).

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58. (416) Before adjusting the high pressure relief control on the 51AF-4 valve, you must also adjust the pressure reducing control (CRD) 90AF-8 valve to

Explanation

To ensure proper functioning of the high pressure relief control on the 51AF-4 valve, it is necessary to adjust the pressure reducing control (CRD) 90AF-8 valve to a pressure that is 5 psi above the normal operating pressure. This adjustment helps to create a sufficient pressure differential between the two valves, allowing the relief control to effectively regulate the pressure and prevent any potential overpressure situations.

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59. (425) What component houses the defuel pump for the type III system?

Explanation

The hydrant servicing vehicle is the correct answer because it houses the defuel pump for the type III system. This vehicle is responsible for delivering fuel to aircraft at airports, and it typically contains the necessary equipment and pumps to transfer fuel from the underground hydrant system to the aircraft. The defuel pump, which is used to remove fuel from the aircraft, is also located within the hydrant servicing vehicle.

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60. (412) The components of the 134AF defueling control valve include; a valve position indicator, solenoid

Explanation

The components of the 134AF defueling control valve include a flow clean strainer and an ejector.

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61. (412) How often is the 134AF defueling control valve operationally inspected?

Explanation

The 134AF defueling control valve is operationally inspected on a quarterly basis. This means that the inspection is conducted every three months. This regular inspection schedule ensures that the valve is functioning properly and can be maintained effectively. By inspecting the valve on a quarterly basis, any potential issues or malfunctions can be identified and addressed in a timely manner, reducing the risk of operational failures or safety hazards.

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62. (418) Once the 40-27G filter separator valve has closed due to high differential pressure, what must be done to get the valve to operate again?

Explanation

To get the 40-27G filter separator valve to operate again after it has closed due to high differential pressure, the CDHS-3A must be manually reset.

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63. (408) When the cover chamber pressure on the 90AF-8 refueling control valve is at least as great as the inlet pressure, the valve will

Explanation

When the cover chamber pressure on the 90AF-8 refueling control valve is at least as great as the inlet pressure, the valve will close fully. This means that the valve will completely shut off the flow of fluid or gas through it. This is because the pressure in the cover chamber is equal to or greater than the inlet pressure, creating a force that pushes the valve to close tightly and prevent any further flow.

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64. (420) What gallons per minute points must be calibrated on the return vanturi's high range differential pressure transmitter?

Explanation

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65. (413) To adjust the flow rate of the differential control on the 41AF rate-of-flow control valve,

Explanation

To adjust the flow rate of the differential control on the 41AF rate-of-flow control valve, the correct action is to turn it counterclockwise. This will decrease the tension of the spring, resulting in a lower flow rate. By reducing the spring tension, the valve will allow more fluid to pass through, thus decreasing the flow rate.

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66. (409) If the 90AF-8 refueling control valve fails to control delivery pressure, which trouble could cause the problem?

Explanation

If the pressure relief control is set too low, it means that the valve is not able to relieve excess pressure, causing the delivery pressure to be uncontrolled. This could result in the 90AF-8 refueling control valve failing to control the delivery pressure.

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67. (415) What are the low and high settings (pounds per square inch {psi}), respectively, for the pressure relief controls on the 51AF-4 valve?

Explanation

The low and high settings for the pressure relief controls on the 51AF-4 valve are 5 psi and 5 psi above the CRL on the 90AF-8.

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68. (431) When is the solenoid on the 58AF-3 pressure control valve on the type IV system deenergized?

Explanation

The solenoid on the 58AF-3 pressure control valve is deenergized when all pumps are off. This means that when there is no power supply to any of the pumps, the solenoid is not activated.

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69. (420) One purpose of the flow switch in the type III is to

Explanation

The purpose of the flow switch in the type III is to lock on the fueling pump. This means that when the flow switch detects that fuel is flowing, it will ensure that the fueling pump remains operational and continues to supply fuel. This is important for maintaining a steady flow of fuel during the fueling process and preventing any interruptions or shutdowns of the pump.

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70. (432) What condition would cause a resonating horn to sound on a type IV system?

Explanation

An emergency fault would cause a resonating horn to sound on a type IV system. This means that there is a fault or malfunction in the emergency system, triggering the horn to sound as a warning signal. The horn is designed to alert personnel and indicate that there is an emergency situation that needs immediate attention or action.

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71. (431) What valve is used as the flush valve in a type IV system?

Explanation

The correct answer is 136AF-5B. This valve is used as the flush valve in a type IV system.

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72. (419) How is excess pressure relieved on the 2129AF overfill valve using the product recovery piping system in the type III system?

Explanation

The correct answer is the pressure relief control bleeds pressure around the valve. This means that when there is excess pressure on the overfill valve, the pressure relief control opens up to release the pressure by bleeding it around the valve. This helps to prevent any potential damage or failure of the valve due to excessive pressure.

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73. (409) What pressure rate must you establish before setting the pressure relief control on the 90AF-8 refueling control valve?

Explanation

Before setting the pressure relief control on the 90AF-8 refueling control valve, you must establish a pressure rate of 5 psi above the normal downstream pressure. This ensures that there is enough pressure to effectively control the flow of fuel during refueling operations.

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74. (418) What is the standard American Petroleum Institute (API) rate and gallons per minute (gpm) of receiving filter seperators used in the type III system?

Explanation

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75. (420) What size suction header is used in the type III system?

Explanation

The correct answer is 16-inch. In a type III system, a 16-inch suction header is used. This size is determined based on the requirements and capacity of the system. A larger suction header allows for a higher flow rate and better performance of the system. It is important to choose the correct size suction header to ensure efficient operation and avoid any potential issues or limitations in the system.

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76. (417) What type piping, 12 inches in diameter, is used in the hydrant loop of a type III system?

Explanation

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77. (431) What type fuel dispensing hose is installed on a type IV hose-end pantograph?

Explanation

The correct answer is 3-inch, API 1529, semi-hardwall. This type of fuel dispensing hose is installed on a type IV hose-end pantograph.

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78. (431) During refueling, at what pressure, in pounds per square inch, does the pantograph pressure control valve relieve excess pressure?

Explanation

The pantograph pressure control valve relieves excess pressure during refueling at a pressure of 75 pounds per square inch.

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79. (422) What do blue lines represent on the type III pump control panel line drawing?

Explanation

The blue lines on the type III pump control panel line drawing represent the pump discharge. This means that the blue lines indicate the path through which the water is being pumped out from the pump.

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80. (721) At what pounds per square inch does the 58AF-3 pressure control valve close?

Explanation

The correct answer is 75. This means that the 58AF-3 pressure control valve closes at 75 pounds per square inch (psi). This indicates that the valve is designed to regulate the pressure and prevent it from exceeding 75 psi.

Submit
81. (418) At what differential pressure must the receiving strainer in the type III system be cleaned?

Explanation

The receiving strainer in a type III system must be cleaned at a differential pressure of 10 psi. This means that when the pressure difference between the inlet and outlet of the strainer reaches 10 psi, it is necessary to clean the strainer to maintain proper functioning of the system. Cleaning the strainer helps remove any debris or particles that may have accumulated, ensuring that the system continues to operate efficiently.

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82. (419) The switch assembly automatically energizes the fuel transfer pump, on the product recovery tank in a type III system, when the tank is

Explanation

The correct answer is 70 percent. This means that the switch assembly will automatically energize the fuel transfer pump on the product recovery tank in a type III system when the tank reaches 70 percent capacity. This ensures that the pump is activated at the appropriate time to transfer fuel and prevent overfilling of the tank.

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83. (427) What type of piping is used downstream of the type IV issue filter separator for a 6-inch pipe?

Explanation

The correct answer is seamless stainless steel, schedule 40. This type of piping is used downstream of the type IV issue filter separator for a 6-inch pipe. Seamless stainless steel pipes are preferred for their corrosion resistance and durability. Schedule 40 refers to the thickness of the pipe wall, which is suitable for the given application.

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84. (415) The primary purpose of having 5 psi in the lateral piping on the 51AF-4 rapid defuel valve is to

Explanation

The primary purpose of having 5 psi in the lateral piping on the 51AF-4 rapid defuel valve is to make sure the hydrant outlet line stays full of fuel. This pressure helps to maintain a continuous flow of fuel from the hydrant outlet line, ensuring that it does not become empty or lose pressure during rapid flow defueling. By keeping the hydrant outlet line full of fuel, the valve helps to prevent any interruptions or reverse flow during the defueling process.

Submit
85. (415) How often is the 41AF-10 inspected?

Explanation

The 41AF-10 is inspected semi-annually, which means it is checked twice a year. This frequency of inspection ensures that any potential issues or problems can be identified and addressed in a timely manner. Regular inspections help maintain the safety and functionality of the 41AF-10, ensuring that it is in good working condition and can be used effectively.

Submit
86. (431) When the flush valve on a type IV system is placed in the pantograph flush mode, the solenoid is

Explanation

When the flush valve on a type IV system is placed in the pantograph flush mode, the solenoid is energized. This means that an electrical current is passing through the solenoid, causing it to activate. As a result, the main valve closes, preventing the flow of water or any other fluid through the system.

Submit
87. (433) In a type IV system, pressure indicating transmitters are located on the

Explanation

In a type IV system, pressure indicating transmitters are located on the issue line downstream of the 136AF-5B. This means that the transmitters are placed after the 136AF-5B valve, which is likely a control valve or a regulator. By placing the transmitters downstream of this valve, they can accurately measure the pressure of the fluid being issued from the system. This information is important for monitoring and controlling the system's pressure levels.

Submit
88. (419) The 413AF-5A high-level shut-off valve's closing feature and rotary disc assembly can be tested without filling the tank up with fuel to the high level shut-off point by

Explanation

Using a manual tester on the high-level shut-off float assembly allows for testing the closing feature and rotary disc assembly of the 413AF-5A high-level shut-off valve without the need to fill the tank up with fuel to the high level shut-off point. This method involves manually testing the float assembly, which is responsible for detecting the fuel level and triggering the shut-off valve when it reaches the high level. By using a manual tester on the float assembly, one can simulate the high fuel level and test the functionality of the shut-off valve without the need for actual fuel.

Submit
89. (436) When a type IV system is placed in the "pantograph flush" mode, the solenoid on the 136AF-5B flush valve

Explanation

When a type IV system is placed in the "pantograph flush" mode, the solenoid on the 136AF-5B flush valve energizes to close the main valve. This means that the solenoid receives an electrical signal to activate and close the main valve, stopping the flow of water. This action is necessary to initiate the flushing process in the pantograph flush mode.

Submit
90. (421) After refueling an aircraft and the lead pump deenergizes, at what pounds per square inch (psi) does the 58AF-9-1 defuel/flush valve close?

Explanation

The 58AF-9-1 defuel/flush valve closes at 80 pounds per square inch (psi) after the lead pump deenergizes.

Submit
91. (420) Where is the issue venturi tube located on the type III system?

Explanation

The issue venturi tube is located downstream of the emergency shut-off valve in the type III system.

Submit
92. (427) What type piping is used on the pressure relief and drain system for a 2-inch pipe in a type IV system?

Explanation

Epoxy-coated carbon steel, schedule 40 piping is used on the pressure relief and drain system for a 2-inch pipe in a type IV system. This type of piping is chosen because it offers good corrosion resistance and durability, making it suitable for handling the pressure relief and drainage requirements in the system. The schedule 40 designation indicates the thickness of the pipe, which is appropriate for the size and function of the system.

Submit
93. (411) The standard pressure setting, on the 50AF-2 pressure valves pressure relief control (CRL), is based on the 90AF-8 refueling valves pressure of

Explanation

The correct answer is 10 psi above its normal inlet pressure. This means that the standard pressure setting on the 50AF-2 pressure relief control (CRL) valve is set to be 10 psi higher than the normal inlet pressure of the 90AF-8 refueling valve. This setting ensures that the pressure relief control valve will open and relieve pressure when the pressure in the refueling valve exceeds its normal operating pressure by 10 psi.

Submit
94. (429) What pounds per square inch backpressure does the pressure relief control maintain on the high level shut-off valve on a type IV underground operating storage tank?

Explanation

The pressure relief control maintains a pounds per square inch backpressure of 8 on the high level shut-off valve on a type IV underground operating storage tank.

Submit
95. (427) What type of piping is used on the main fuel line of a type IV system for a 2-inch pipe?

Explanation

The correct answer is epoxy-coated carbon steel, schedule 80. This type of piping is used on the main fuel line of a type IV system for a 2-inch pipe. Epoxy coating provides corrosion resistance, while carbon steel provides strength and durability. Schedule 80 indicates the thickness of the pipe, which is important for handling high-pressure applications.

Submit
96. (418) The 40-28G bypass valve opens and fuel bypasses the receiving separators when fuel is received from a cross-country pipeline on the type III system. The differential pressure causing this action occurs when

Explanation

When 15 psi is sensed across the receiving separator, the 40-28G bypass valve opens and allows fuel to bypass the receiving separators. This occurs because the differential pressure of 15 psi indicates that there is a high pressure on the receiving side, which triggers the bypass valve to open and relieve the excess pressure by diverting the fuel flow.

Submit
97. (404) During refueling, which 302AF fueling and defueling valve component holds the defuel side of the main valve component closed?

Explanation

The correct answer is "Loaded CRL". The Loaded CRL component holds the defuel side of the main valve component closed during refueling.

Submit
98. (419) When fuel reaches the high level alarm setting on a type III operating storage tank, one warning is given by the high-level alarm window on the pump control panel (PCP). How do you see and hear the warning?

Explanation

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Submit
99. (418) A gallons per minute displacement meter is used in the receiving line of a type III system. Which type does it use?

Explanation

A gallons per minute displacement meter measures the flow rate of liquid in a system. In a type III system, the receiving line is where the liquid is being received. The fact that the displacement meter is used in the receiving line indicates that it is measuring the incoming flow of liquid. The term "non-positive" suggests that the meter is not measuring a positive flow rate, but rather a flow rate that is either zero or negative. Therefore, the correct answer is 1200 Non-positive, indicating that the displacement meter used in the receiving line of a type III system measures a non-positive flow rate of 1200 gallons per minute.

Submit
100. (435) When a type IV system is place in the "loop flush" mode, the solenoid on the 136AF-5B flush valve

Explanation

When a type IV system is placed in the "loop flush" mode, the solenoid on the 136AF-5B flush valve energizes to open the main valve.

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(405) Approximately how long do you want it to take the fueling valve...
(401) What positions are on the pump control switch?
(402) Most emergency service calls involve
(414) What type of ground rods are hydrant outlets grounded to in the...
(404) The primary purpose of the orifice plate on the 302AF fueling...
(426) The type III system must be flushed
(432) What switch, on the type IV pump control panel, looks like a red...
(408) If the cover chamber pressure on the 90AF-8 refueling control...
(404) A damaged diaphragm on the pressure reducing control is...
(401) The pressure/flow recorder indicates which of the following?
(424) What happens if the third pump is called on automatically in a...
(403) How many hydrant outlets are served by each panero pit?
(404) What component closes the main valve of the 302AF...
(408) What happens to the auxiliary hytrols A and B, on the 90AF-8...
(422) What does the first symbol in a rung of ladder logic represent?
(406) To remedy a leakage on the Philidelphia hydrant adapter, which...
(407) How many manual valves are found in the lateral control pit of...
(430) What type fueling pumps are used in a type IV cut and cover...
(407) What lateral control pit component automatically cuts off the...
(422) How long will the back-up battery maintain the type III...
(426) To flush a type III system, you must turn the selector switch on...
(420) Defining temperature rating for motors used with fueling pumps...
(424) What happens to the lead, second, third, and fourth pump when...
(413) What is the probable cause when the 41AF-10 main valve opens...
(432) What do blue lines on the type IV pump control panel graphic...
(419) At what full percentage does the overfill valve close in the...
(420) What millampere (mA) signal does the differential pressure...
(421) The 352AF-8 hydrant control valve opens when an aircraft is...
(421) Solenoid "B" on the 58AF-9-1 defuel/flush valve...
(417) What type steel is used in the control tubing of the type III...
(419) Where is the ball float for the 413AF-5A high-level shut-off...
(419) A type III operating storage tank level indicator servo...
(428) What size mesh screen is used in the receiving strainer of a...
(407) When you place a magnet on the defuel magnetic control switch,...
(420) Each issue filter separator in the type III system is rated for...
(423) To set up the pump control panel for fueling on the type III...
(408) The pressure relief control, on the 90AF-8 is set to
(409) Which of the following would probably cause the 90AF-8 refueling...
(410) Which statement best describes what is removed from the strainer...
(414) When defueling stops, the 352AF hydrant adapter controls its own...
(419) What size piping is used to connect the pressure reliefs and...
(404) When operating normally, what part of the 302AF...
(421) At what pressure, in pounds per square inch, does the 58AF-9...
(414) After activating an emergency stop switch at the type 2 hydrant...
(412) What condition exists when fuel leaks past the 134AF main valve...
(406) What components are magnetized when you place a magnet on the...
(620) When the two solenoids on the 136AF-9B emergency shut-off valve...
(419) When fuel reaches the high-high level alarm setting, the...
(419) What size is the product recovery tank?
(405) The first adjustment you make , when setting the pressure on a...
(416) According to the troubleshooting guide, Which component has...
(429) When does the high level light go out once the operator has...
(434) During aircraft refueling, as demand for fuel flowing through...
(405) What delivery pressure causes the fueling side, of the 302AF...
(411) How often should you check the 50AF-2 pressure relief valve to...
(413) Which component on the 41AF rate-of-flow control valve causes...
(414) At what maximum differential pressure, in pounds per square inch...
(416) Before adjusting the high pressure relief control on the 51AF-4...
(425) What component houses the defuel pump for the type III system?
(412) The components of the 134AF defueling control valve include; a...
(412) How often is the 134AF defueling control valve operationally...
(418) Once the 40-27G filter separator valve has closed due to high...
(408) When the cover chamber pressure on the 90AF-8 refueling control...
(420) What gallons per minute points must be calibrated on the return...
(413) To adjust the flow rate of the differential control on the 41AF...
(409) If the 90AF-8 refueling control valve fails to control delivery...
(415) What are the low and high settings (pounds per square inch...
(431) When is the solenoid on the 58AF-3 pressure control valve on the...
(420) One purpose of the flow switch in the type III is to
(432) What condition would cause a resonating horn to sound on a type...
(431) What valve is used as the flush valve in a type IV system?
(419) How is excess pressure relieved on the 2129AF overfill valve...
(409) What pressure rate must you establish before setting the...
(418) What is the standard American Petroleum Institute (API) rate and...
(420) What size suction header is used in the type III system?
(417) What type piping, 12 inches in diameter, is used in the hydrant...
(431) What type fuel dispensing hose is installed on a type IV...
(431) During refueling, at what pressure, in pounds per square inch,...
(422) What do blue lines represent on the type III pump control panel...
(721) At what pounds per square inch does the 58AF-3 pressure control...
(418) At what differential pressure must the receiving strainer in the...
(419) The switch assembly automatically energizes the fuel transfer...
(427) What type of piping is used downstream of the type IV issue...
(415) The primary purpose of having 5 psi in the lateral piping on the...
(415) How often is the 41AF-10 inspected?
(431) When the flush valve on a type IV system is placed in the...
(433) In a type IV system, pressure indicating transmitters are...
(419) The 413AF-5A high-level shut-off valve's closing feature and...
(436) When a type IV system is placed in the "pantograph...
(421) After refueling an aircraft and the lead pump deenergizes, at...
(420) Where is the issue venturi tube located on the type III system?
(427) What type piping is used on the pressure relief and drain system...
(411) The standard pressure setting, on the 50AF-2 pressure valves...
(429) What pounds per square inch backpressure does the pressure...
(427) What type of piping is used on the main fuel line of a type IV...
(418) The 40-28G bypass valve opens and fuel bypasses the receiving...
(404) During refueling, which 302AF fueling and defueling valve...
(419) When fuel reaches the high level alarm setting on a type III...
(418) A gallons per minute displacement meter is used in the receiving...
(435) When a type IV system is place in the "loop flush"...
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