Liquid Fuels Systems-cdc3e452 (Vol.5)
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Liquid Fuels Systems Maintenance Journeyman
Volume 5: Operation and Maintenance of Hydrant System Components
CDC 3E452
Questions and Answers
- 1.
(801) The Class 1, Division 2, hazardous area around a service station dispenser extends outward how many feet and upward how many inches?
- A.
20 feet, 18 inches
- B.
20 feet, 24 inches
- C.
50 feet, 18 inches
- D.
50 feet, 24 inches
Correct Answer
A. 20 feet, 18 inchesExplanation
The Class 1, Division 2 hazardous area around a service station dispenser extends outward 20 feet and upward 18 inches.Rate this question:
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- 2.
(801) What type of electrical units and wiring is used in nonhazardous locations, such as pressurized control rooms?
- A.
Explosion-proof, enclosed type
- B.
General-purpose, enclosed type
- C.
Explosion-proof, non-enclosed type
- D.
General-purpose, non-enclosed type
Correct Answer
B. General-purpose, enclosed typeExplanation
In nonhazardous locations, such as pressurized control rooms, general-purpose, enclosed type electrical units and wiring are used. This means that the electrical units and wiring are designed to be used in a variety of applications and are enclosed to protect them from external elements and potential damage. This type of wiring is suitable for nonhazardous environments where there is no risk of explosions or other hazardous conditions.Rate this question:
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- 3.
(801) What type of ground rod, if any, is used on a horizontal fuel tank installed under the pump-house floor?
- A.
Copper
- B.
Galvanized
- C.
Stainless steel
- D.
Not required
Correct Answer
D. Not requiredExplanation
The correct answer is "Not required" because a ground rod is not necessary for a horizontal fuel tank installed under the pump-house floor. Ground rods are typically used to provide grounding for electrical systems and equipment, but in this case, there is no need for grounding as the tank is installed underground and does not pose a risk of electrical hazards.Rate this question:
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- 4.
(802) The Pritchard system control room has how many electrical panels? For what are they used?
- A.
2; pump control and pump selector
- B.
2; pump selector and transformer selector
- C.
3; pump control, pump selector, and defuel pumps
- D.
3; pump control, transformer selector, and pump selector
Correct Answer
C. 3; pump control, pump selector, and defuel pumpsExplanation
The Pritchard system control room has three electrical panels. These panels are used for pump control, pump selector, and defuel pumps.Rate this question:
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- 5.
(802) The positions of the pump control selector switch are
- A.
HAND/OFF.
- B.
HAND/AUTO.
- C.
HAND/OFF/AUTO
- D.
HAND/OFF/MANUAL
Correct Answer
C. HAND/OFF/AUTOExplanation
The correct answer is HAND/OFF/AUTO because these are the positions of the pump control selector switch. In the HAND position, the pump is manually controlled. In the OFF position, the pump is turned off. In the AUTO position, the pump is automatically controlled based on certain conditions or settings. This combination of positions allows for manual, automatic, and off operation of the pump.Rate this question:
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- 6.
(803) Emergency stop switches at a truck loading header must be no closer than how many feet?
- A.
10
- B.
25
- C.
50
- D.
100
Correct Answer
B. 25Explanation
Emergency stop switches at a truck loading header must be no closer than 25 feet. This distance ensures that the switch is easily accessible in case of an emergency, allowing for quick and efficient response to stop any potential hazards or accidents. Placing the switch at a closer distance may increase the risk of accidental activation or hinder accessibility during critical situations.Rate this question:
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- 7.
(803) The emergency stop switches have what type of contacts and complete which circuits?
- A.
Open; low-voltage for the fuel transfer pump control
- B.
Closed; low-voltage for the fuel transfer pump control
- C.
Open; high-voltage for the fuel transfer pump control
- D.
Closed; high-voltage for the fuel transfer pump control
Correct Answer
B. Closed; low-voltage for the fuel transfer pump controlExplanation
The emergency stop switches have closed contacts and complete the low-voltage circuit for the fuel transfer pump control. This means that when the emergency stop switch is activated, the contacts close and allow the low-voltage current to flow through, activating the fuel transfer pump control.Rate this question:
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- 8.
(803) Emergency stop switches are painted what color?
- A.
Red
- B.
Amber
- C.
Orange
- D.
Yellow
Correct Answer
A. RedExplanation
Emergency stop switches are painted red because red is a universally recognized color for danger and emergencies. Using red for emergency stop switches helps to ensure that they are easily identifiable and distinguishable from other switches or controls in a potentially hazardous situation. This color coding system helps to promote safety by allowing individuals to quickly locate and activate the emergency stop switch in case of an emergency or when immediate action is required to stop a machine or process.Rate this question:
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- 9.
(804) Which of the following should you check first if a pump motor will not start or hum?
- A.
Fuses
- B.
Relays
- C.
Fuel level
- D.
Control panel setup
Correct Answer
D. Control panel setupExplanation
If a pump motor will not start or hum, the first thing to check is the control panel setup. This is because the control panel setup includes the settings and configurations that determine how the pump motor operates. If the control panel is not properly set up or if there are any issues with the settings, it can prevent the motor from starting or humming. Therefore, checking the control panel setup is the logical first step in troubleshooting the issue.Rate this question:
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- 10.
(805) What do most emergency service calls involve?
- A.
Electrical shorts
- B.
No delivery of fuel
- C.
Minor leaks
- D.
Jammed valves
Correct Answer
B. No delivery of fuelExplanation
Most emergency service calls likely involve situations where there is no delivery of fuel. This could include scenarios such as a car running out of gas, a fuel pump failure, or a problem with the fuel line. These types of situations can be urgent as they can leave individuals stranded or unable to operate their vehicles.Rate this question:
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- 11.
(805) If the pump is running, what should be your first stop in diagnosing a fuel delivery problem?
- A.
Pump
- B.
Valves
- C.
As-built drawing
- D.
Fuel storage tank
Correct Answer
C. As-built drawingExplanation
The correct answer is As-built drawing. When diagnosing a fuel delivery problem, the first stop should be to consult the as-built drawing. This drawing provides detailed information about the layout and configuration of the fuel delivery system, including the location of the pump, valves, and fuel storage tank. By referring to the as-built drawing, one can identify any potential issues or malfunctions in the system and proceed with further troubleshooting accordingly.Rate this question:
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- 12.
(806) How many hydrant outlet are normally installed for each 302AF fueling and defueling valve?
- A.
1
- B.
2
- C.
3
- D.
4
Correct Answer
A. 1Explanation
For each 302AF fueling and defueling valve, normally only one hydrant outlet is installed.Rate this question:
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- 13.
(806) The defuel line in the Panero hydrant system pit has a 'U' bend to
- A.
Allow for expansion
- B.
Absorb hydraulic shock
- C.
Keep the entire line from draining
- D.
Provide a place for priming the pump
Correct Answer
C. Keep the entire line from drainingExplanation
The defuel line in the Panero hydrant system pit has a 'U' bend to keep the entire line from draining. This is important because if the line were to completely drain, it would require additional time and effort to refill it before it can be used again. By having a 'U' bend, it creates a low point in the line where fuel can collect and prevent it from fully draining. This ensures that the line is always ready for immediate use without any delays or complications.Rate this question:
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- 14.
(807) What component aids in opening the 302AF fueling and defueling valve?
- A.
VPI
- B.
Hytrol
- C.
Ejector
- D.
Ejector-strainer
Correct Answer
D. Ejector-strainerExplanation
The ejector-strainer is the component that aids in opening the 302AF fueling and defueling valve. It is responsible for creating a vacuum that helps to open the valve and allow fuel or defuel fluid to flow through. Additionally, the ejector-strainer also filters out any debris or contaminants in the fluid to ensure a clean and efficient fueling or defueling process.Rate this question:
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- 15.
(807) What indicated leakage past the diaphragm on the pressure relief control?
- A.
Uncontrolled downstream flow
- B.
Fuel leakage from the vent port
- C.
Uncontrolled downstream pressure
- D.
Fuel leaking from the disc removal plug
Correct Answer
B. Fuel leakage from the vent portExplanation
Fuel leakage from the vent port indicates leakage past the diaphragm on the pressure relief control. The vent port is designed to release excess pressure, and if fuel is leaking from it, it suggests that the diaphragm is not properly sealing and allowing fuel to escape. This can lead to uncontrolled downstream flow and potentially unsafe conditions.Rate this question:
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- 16.
(807) What component closes the refueling side of the 302AF fueling and defueling valve when there is excess flow at the hydrant outlet?
- A.
CRD
- B.
CDHS-3
- C.
Loading CRL
- D.
CV flow control
Correct Answer
B. CDHS-3Explanation
CDHS-3 is the component that closes the refueling side of the 302AF fueling and defueling valve when there is excess flow at the hydrant outlet.Rate this question:
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- 17.
(807) The primary purpose of the orifice plate on the 302AF fueling and defueling valve is to create a differential pressure
- A.
To operate the CDHS-2
- B.
To operate the CDHS-3
- C.
To operate the CDHS-4
- D.
To operate the CDHS-5
Correct Answer
B. To operate the CDHS-3Explanation
The orifice plate on the 302AF fueling and defueling valve is used to create a differential pressure. This differential pressure is necessary to operate the CDHS-3.Rate this question:
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- 18.
(807) During refueling, which 302AF fueling and defueling valve component is responsible for closing the defuel side of the main valve?
- A.
Loading CRL
- B.
CDHS-3
- C.
Solenoid
- D.
Hytrol
Correct Answer
C. SolenoidExplanation
The solenoid is responsible for closing the defuel side of the main valve during refueling.Rate this question:
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- 19.
(808) When yo adjust the unloading CRL on the 302AF fueling and defueling valve, at what pressure do you set the CRL?
- A.
5 psi above NOP
- B.
10 psi above NOP
- C.
5 psi above NIP
- D.
10 psi above NIP
Correct Answer
A. 5 psi above NOPExplanation
When adjusting the unloading CRL on the 302AF fueling and defueling valve, the CRL is set at 5 psi above NOP.Rate this question:
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- 20.
(808) When you adjust the 302AF fueling and defueling valve, at what rate do you set the CV flow control?
- A.
10 seconds
- B.
20 seconds
- C.
30 seconds
- D.
40 seconds
Correct Answer
B. 20 secondsExplanation
When adjusting the 302AF fueling and defueling valve, the CV flow control should be set at a rate of 20 seconds. This means that it will take 20 seconds for the valve to fully open or close, allowing for a controlled and gradual flow of fuel or defuel. This rate ensures that the adjustments are made smoothly and accurately, preventing any sudden or drastic changes in fuel flow.Rate this question:
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- 21.
(808) In order to calculate the differential pressure required to adjust the CDHS-3 properly, you need to know the
- A.
Upstream pressure and flow rate
- B.
Orifice-plate size and downstream pressure
- C.
Upstream pressure and downstream pressure
- D.
Gallons-per-minute delivery and orifice-plate bore size
Correct Answer
D. Gallons-per-minute delivery and orifice-plate bore sizeExplanation
To calculate the differential pressure required to adjust the CDHS-3 properly, you need to know the gallons-per-minute delivery and orifice-plate bore size. This is because the orifice-plate bore size determines the flow rate, and the gallons-per-minute delivery represents the flow rate. The differential pressure is the difference between the upstream and downstream pressures, but in order to calculate it accurately, you need to know the flow rate and orifice-plate bore size.Rate this question:
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- 22.
(809) What would happen if the vacuum breaker on a hose coupling failed to open?
- A.
Refueling could not be done
- B.
Defueling could not be done
- C.
Fuel from the hydrant outlet and fueling hose would not drain properly
- D.
A constant delivery of pressure to the hydrant outlet could not be maintained
Correct Answer
C. Fuel from the hydrant outlet and fueling hose would not drain properlyExplanation
If the vacuum breaker on a hose coupling failed to open, fuel from the hydrant outlet and fueling hose would not drain properly. The vacuum breaker is designed to prevent a vacuum from forming in the fueling system, allowing air to enter and equalize the pressure. If it fails to open, a vacuum could develop, preventing proper drainage of fuel from the outlet and hose. This could lead to fuel stagnation, blockages, and potentially unsafe conditions during refueling operations.Rate this question:
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- 23.
(809) The magnetic switch at the hydrant in the modified Panero system energizes the
- A.
302AF solenoid only
- B.
Deep-well pump only
- C.
302AF solenoid and defueling pump
- D.
302AF solenoid and deep-well turbine pumps
Correct Answer
D. 302AF solenoid and deep-well turbine pumpsExplanation
The magnetic switch at the hydrant in the modified Panero system energizes both the 302AF solenoid and the deep-well turbine pumps.Rate this question:
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- 24.
(809) Which of these would remedy leakage on the Philadelphia hydrant adapter?
- A.
Replace the poppet
- B.
Replace the stem guide
- C.
Replace the flange gasket
- D.
Replace the disc and seat
Correct Answer
C. Replace the flange gasketExplanation
Replacing the flange gasket would remedy leakage on the Philadelphia hydrant adapter. The flange gasket is a sealing component that prevents leaks between the hydrant adapter and the hydrant. If the gasket is damaged or worn out, it can result in leakage. By replacing the flange gasket, a new and properly functioning gasket will be installed, ensuring a tight seal and preventing any further leakage.Rate this question:
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- 25.
(810) How many automatic valves are found in the lateral control pit of the Pritchard system?
- A.
1
- B.
2
- C.
3
- D.
4
Correct Answer
D. 4Explanation
In the lateral control pit of the Pritchard system, there are four automatic valves.Rate this question:
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- 26.
(810) What lateral control pit component cuts off the defuel pump when the hydrant outlet closes?
- A.
Solenoid control switch
- B.
Pump circuit breaker
- C.
Vacuum control switch
- D.
Panel selector switch
Correct Answer
C. Vacuum control switchExplanation
The vacuum control switch is the correct answer because it cuts off the defuel pump when the hydrant outlet closes. This switch is responsible for controlling the flow of fuel and is designed to activate or deactivate the pump based on the vacuum pressure in the system. When the hydrant outlet closes, the vacuum control switch detects the change in pressure and cuts off the defuel pump to prevent any further fuel flow.Rate this question:
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- 27.
(811) When the cover-chamber pressure of the 90AF-8 refueling control valve is at least as great as the inlet pressure, the valve
- A.
Pulsates
- B.
Modulates
- C.
Opens fully
- D.
Closes tightly
- E.
Correct Answer
D. Closes tightlyExplanation
When the cover-chamber pressure of the 90AF-8 refueling control valve is at least as great as the inlet pressure, the valve closes tightly. This means that the valve is fully closed and there is no flow of fluid through it. The equal or higher pressure in the cover-chamber prevents any leakage or opening of the valve, ensuring a tight seal.Rate this question:
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- 28.
(811) What type solenoid is used on the 90AF-8 refueling control valve?
- A.
Two-port, normally open
- B.
Two-port, normally closed
- C.
Three-port, normally open
- D.
Three-port, normally closed
Correct Answer
B. Two-port, normally closedExplanation
The correct answer is two-port, normally closed. This means that the solenoid used on the 90AF-8 refueling control valve has two ports and is normally closed, meaning that it blocks the flow of fluid unless it is actively opened by an electrical signal.Rate this question:
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- 29.
(811) At what pressure is the CRD on the 90AF-8 refueling control valve set?
- A.
50 psi
- B.
55 psi
- C.
100 psi
- D.
105 psi
Correct Answer
C. 100 psiExplanation
The CRD on the 90AF-8 refueling control valve is set at 100 psi.Rate this question:
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- 30.
(811) The setting of the pressure relief on the 90AF-8 refueling control valve is
- A.
5 psi higher than the NOP of the 90AF-8
- B.
5 psi higher than the NIP of the 90AF-8
- C.
5 psi higher than the NOP of the 51AF-4
- D.
5 psi higher than the NIP of the 51AF-4
Correct Answer
B. 5 psi higher than the NIP of the 90AF-8Explanation
The correct answer is "5 psi higher than the NIP of the 90AF-8." This means that the pressure relief on the 90AF-8 refueling control valve is set at a pressure that is 5 psi higher than the Normal Operating Pressure (NOP) of the 90AF-8. The NIP refers to the Normal Inlet Pressure, which is the pressure at which the valve operates normally. By setting the pressure relief 5 psi higher than the NIP, it ensures that the valve will open and relieve excess pressure when the pressure exceeds the normal operating range.Rate this question:
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- 31.
(812) How often is the 90AF-8 refueling control valve operationally inspected?
- A.
Monthly
- B.
Quarterly
- C.
Semiannually
- D.
Annually
Correct Answer
B. QuarterlyExplanation
The 90AF-8 refueling control valve is operationally inspected on a quarterly basis. This means that the valve is checked for any malfunctions or issues every three months. Regular inspections help ensure that the valve is functioning properly and can be relied upon for refueling operations. Quarterly inspections strike a balance between frequent checks and efficient use of resources.Rate this question:
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- 32.
(812) Before you set the CRL on the 90AF-8 refueling control valve, what pressure must you establish?
- A.
2 to 3 psi above normal downstream pressure
- B.
2 to 3 psi above normal upstream pressure
- C.
5 psi above normal downstream pressure
- D.
5 psi above normal upstream pressure
Correct Answer
C. 5 psi above normal downstream pressureExplanation
Before setting the CRL on the 90AF-8 refueling control valve, a pressure of 5 psi above normal downstream pressure must be established.Rate this question:
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- 33.
(812) Which of these would probably cause the 90AF-8 refueling control vavlve to open, then close?
- A.
Hytrol A closing
- B.
CDHS-3 tripping
- C.
Solenoid not energized
Correct Answer
B. CDHS-3 trippingExplanation
When the CDHS-3 trips, it means that there is a fault or failure in the CDHS-3 system. This fault could potentially cause a loss of power or signal to the 90AF-8 refueling control valve. As a result, the valve would open due to the loss of control, but then quickly close again as the system detects the fault and attempts to correct it. Therefore, the CDHS-3 tripping would likely cause the 90AF-8 refueling control valve to open and then close.Rate this question:
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- 34.
(813) How many auxiliary components does the 50AF-2 pressure relief valve have in its control system?
- A.
1
- B.
2
- C.
3
- D.
4
Correct Answer
B. 2Explanation
The 50AF-2 pressure relief valve has 2 auxiliary components in its control system.Rate this question:
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- 35.
(813) Why is the main valve body of the 50AF-2 pressure relief valve installed with the flow under the disc?
- A.
To increase system pressure
- B.
So the main diaphragm will operate properly
- C.
To provide a smoother low through the valve
- D.
For system safety in case the main valve diaphragm ruptures
Correct Answer
D. For system safety in case the main valve diaphragm rupturesExplanation
The main valve body of the 50AF-2 pressure relief valve is installed with the flow under the disc for system safety in case the main valve diaphragm ruptures. This configuration ensures that if the diaphragm fails, the pressure relief valve will still be able to relieve excess pressure and prevent damage to the system. By having the flow under the disc, any pressure buildup will push the disc against the seat, effectively sealing off the flow and preventing further pressure increase. This helps to safeguard the system and prevent potential hazards or accidents.Rate this question:
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- 36.
(814) How often should the 50AF-2 pressure relief valve be checked to ensure that it is opening and relieving pressure?
- A.
Annually
- B.
Quarterly
- C.
Monthly
- D.
Weekly
Correct Answer
A. AnnuallyExplanation
The 50AF-2 pressure relief valve should be checked annually to ensure that it is opening and relieving pressure. Checking it on a yearly basis allows for regular maintenance and ensures that the valve is functioning properly. This frequency allows for any potential issues to be identified and addressed in a timely manner, preventing any potential damage or safety hazards.Rate this question:
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- 37.
(814) What is the standard setting for the 50AF-2 pressure relief valve's CRL?
- A.
22-3 psi above NOP of the 90AF-8
- B.
2-3 psi above NIP of the 90AF-8
- C.
10 psi above NOP of the 90AF-8
- D.
10 psi above NIP of the 90AF-8
Correct Answer
D. 10 psi above NIP of the 90AF-8Explanation
The correct answer is 10 psi above NIP of the 90AF-8. This means that the standard setting for the 50AF-2 pressure relief valve's CRL is 10 psi higher than the Normal Operating Pressure (NIP) of the 90AF-8. This setting ensures that the pressure relief valve will activate when the pressure exceeds the NIP by 10 psi, preventing any potential damage or failure in the system.Rate this question:
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- 38.
(814) What would be a prime suspect if you noticed a 50AF-2 pressure relief valve pulsating during a refueling operation?
- A.
Loose diaphragm washer
- B.
Obstruction in main valve
- C.
Clogged cover-chamber tubing
- D.
Air in main valve cover chamber
Correct Answer
D. Air in main valve cover chamberExplanation
If a 50AF-2 pressure relief valve is pulsating during a refueling operation, the most likely cause would be air trapped in the main valve cover chamber. This can disrupt the normal flow of fluid and cause pulsations in the valve. The other options, such as a loose diaphragm washer, obstruction in the main valve, or clogged cover-chamber tubing, may cause other issues but are less likely to result in pulsations.Rate this question:
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- 39.
(815) The components of the 134AF defueling control valve include a valve position indicator,
- A.
Flow clean strainer, ejector, and solenoid
- B.
Ejector, solenoid, and pressure relief valve
- C.
Orifice strainer, solenoid, and pressure relief valve
- D.
Ejector-strainer, solenoid, and pressure differential control
Correct Answer
A. Flow clean strainer, ejector, and solenoidExplanation
The correct answer is "flow clean strainer, ejector, and solenoid". The components listed in this answer are the specific parts that make up the 134AF defueling control valve. The flow clean strainer is responsible for filtering out any debris or contaminants in the fuel, ensuring that it is clean before it enters the valve. The ejector is used to create a vacuum that allows the fuel to be drawn out of the tank. The solenoid is an electromechanical device that controls the flow of fuel through the valve. Together, these components work together to control the defueling process.Rate this question:
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- 40.
(815) How often is the 134AF defueling control valve operationally inspected?
- A.
Monthly
- B.
Quarterly
- C.
Semiannually
- D.
Annually
Correct Answer
C. SemiannuallyExplanation
The 134AF defueling control valve is operationally inspected semiannually. This means that the valve is checked for any issues or malfunctions every six months. Regular inspections are important to ensure that the valve is functioning properly and to identify any potential problems early on. Semiannual inspections help to maintain the valve's performance and prevent any disruptions or failures in the defueling process.Rate this question:
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- 41.
(816) What is the probably cause if the 41AF-10 main valvve opens when refueling and is detected by the defueling pump rotating?
- A.
Leakage through normally open solenoid valve
- B.
Leakage through normally closed solenoid valve
- C.
Leakage through solenoid valve during slow flow
- D.
Check valve installed backwards
Correct Answer
B. Leakage through normally closed solenoid valveExplanation
The probably cause if the 41AF-10 main valve opens when refueling and is detected by the defueling pump rotating is leakage through the normally closed solenoid valve. This means that the solenoid valve, which is supposed to be closed during refueling, is allowing fuel to leak through it, causing the main valve to open. This can lead to fuel loss and potential safety hazards during refueling operations.Rate this question:
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- 42.
(817) The type 352AF hydrant adapter controls the level at which fuel flow stops in defueling in order to
- A.
Keep moisture out of the system
- B.
Prevent corrosion in the piping system
- C.
Keep the fuel pressure from getting too high
- D.
Prevent air from entering the installed piping system
Correct Answer
D. Prevent air from entering the installed piping systemExplanation
The type 352AF hydrant adapter is designed to prevent air from entering the installed piping system during defueling. This is important because air in the fuel system can cause problems such as fuel vapor lock, which can disrupt the flow of fuel and potentially lead to engine failure. By preventing air from entering the system, the hydrant adapter ensures that fuel flow remains uninterrupted and the fuel system operates smoothly.Rate this question:
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- 43.
(817) When does the defuel pump shut off automatically?
- A.
When the 352AF bypass opens
- B.
When the 352AF bypass closes
- C.
When the 352AF float assembly opens
- D.
When the 352AF float assembly closes
Correct Answer
D. When the 352AF float assembly closesExplanation
The defuel pump shuts off automatically when the 352AF float assembly closes. This means that when the float assembly reaches a certain level, it triggers the pump to stop pumping fuel.Rate this question:
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- 44.
(817) When the defuel pump shurs off automatically, what opens its electrical control circuit?
- A.
Vacuum control switch
- B.
Pump circuit breaker
- C.
Pump control switch
- D.
Air control switch
Correct Answer
A. Vacuum control switchExplanation
When the defuel pump shuts off automatically, the electrical control circuit is opened by the vacuum control switch. This switch is responsible for sensing the vacuum pressure and triggering the pump to shut off when the desired level is reached. By opening the electrical control circuit, the vacuum control switch ensures that power is cut off to the pump, preventing it from continuing to operate unnecessarily.Rate this question:
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- 45.
(817) Suppose you are testing a magnetic switch. what reading is shown on the ohmmeter when the magnet is placed on the switch plate?
- A.
Zero
- B.
Infinity
- C.
A fixed reading between zero and infinity
- D.
A fluctuating reading between zero and infinity
Correct Answer
A. ZeroExplanation
When a magnet is placed on the switch plate of a magnetic switch, the reading on the ohmmeter will show zero. This is because the magnet attracts the metal contacts inside the switch, causing them to come into contact and complete the circuit. When the circuit is closed, there is no resistance, resulting in a reading of zero on the ohmmeter.Rate this question:
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- 46.
(817) After activating an emergency stop switch at the Type II hydrant outlet, how do you reset the system to refuel?
- A.
Place the magnet on the refuel KISS switch
- B.
Place the cover back on the emergency switch
- C.
Manually reset the controls in the lateral control pit
- D.
Manually reset the controls in the pump-house control room
Correct Answer
D. Manually reset the controls in the pump-house control roomExplanation
To refuel after activating an emergency stop switch at the Type II hydrant outlet, the system needs to be manually reset. This can be done by resetting the controls in the pump-house control room. This indicates that there are specific controls in the control room that need to be manually adjusted or reset in order to resume the refueling process. Placing a magnet on the refuel KISS switch or placing the cover back on the emergency switch are not mentioned as steps for resetting the system in this scenario.Rate this question:
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- 47.
(817) When the piping system of the Type II is not cathodically protected, to what are hydrant outlets grounded?
- A.
A tin grounding rod
- B.
A cast steel grounding rod
- C.
A black iron grounding rod
- D.
A galvanized grounding rod
Correct Answer
D. A galvanized grounding rodExplanation
When the piping system of the Type II is not cathodically protected, the hydrant outlets are grounded to a galvanized grounding rod. This is because galvanized grounding rods are designed to provide a reliable and low-resistance path for electrical currents to flow into the ground. By grounding the hydrant outlets to a galvanized grounding rod, any stray electrical currents or potential surges can be safely discharged into the ground, preventing damage to the piping system and ensuring the safety of the surrounding area.Rate this question:
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- 48.
(818) when a magnet is placed on the defuel KISS switch, the solenoid of the 51AF04 rapid defuel valve is energized open along with the
- A.
Defuel pump
- B.
Solenoid on the refuel valve
- C.
Solenoid on the defuel valve
- D.
Solenoid on the 41AF valve
Correct Answer
A. Defuel pumpExplanation
When a magnet is placed on the defuel KISS switch, the solenoid of the 51AF04 rapid defuel valve is energized open. This means that the solenoid receives an electric current and allows the valve to open, allowing fuel to flow through. The defuel pump is connected to the rapid defuel valve, so when the valve opens, it allows the defuel pump to pump fuel out of the system. Therefore, the correct answer is the defuel pump.Rate this question:
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- 49.
(818) What are the settings for both pressure reliefs on the 51AF-4 rapid defuel valve?
- A.
LOW = 5 psi, and HIGH = 5 psi above the CR: on the 90AF-8
- B.
LOW = 5 psi, and HIGH = 5 psi above the CRL on the 50AF-2
- C.
LOW = 10 psi, and HIGH = 5 psi above the CRL on the 90AF-8
- D.
LOW = 10 psi, and HIGH = 5 psi above the CRL on the 50AF-2
Correct Answer
A. LOW = 5 psi, and HIGH = 5 psi above the CR: on the 90AF-8Explanation
The correct answer is LOW = 5 psi, and HIGH = 5 psi above the CR: on the 90AF-8. This means that the low pressure relief setting on the 90AF-8 rapid defuel valve is 5 psi, and the high pressure relief setting is 5 psi above the control range (CR). This setting ensures that the valve will open and relieve pressure when it reaches 5 psi above the CR, preventing any excessive pressure buildup.Rate this question:
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- 50.
(818) How often is the 41AF-10 operationally inspected?
- A.
Monthly
- B.
Quarterly
- C.
Semiannually
- D.
Annually
Correct Answer
C. SemiannuallyExplanation
The 41AF-10 is operationally inspected semiannually. This means that the inspection is conducted twice a year. This regular inspection ensures that the 41AF-10 is functioning properly and meets all operational requirements. Conducting the inspection semiannually allows for timely identification and resolution of any issues or maintenance needs, ensuring the continued efficiency and effectiveness of the 41AF-10.Rate this question:
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Current Version
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Dec 04, 2023Quiz Edited by
ProProfs Editorial Team -
Sep 17, 2010Quiz Created by
JiminyCricket
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