Set B Volume 2
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Questions and Answers
- 1.
(201) What does the Defense Energy Support Center (DESC) determine the type, size, and number of fuel tanks needed at each base based on?
- A.
Air Force standard design
- B.
The mission requirements
- C.
MAJCOM recommendation
- D.
Available construction dollars
Correct Answer
B. The mission requirementsExplanation
The Defense Energy Support Center (DESC) determines the type, size, and number of fuel tanks needed at each base based on the mission requirements. This means that DESC considers the specific needs and objectives of each base and designs the fuel tanks accordingly. It ensures that the fuel tanks are suitable for supporting the base's operations and meeting its fuel demands. The mission requirements play a crucial role in determining the appropriate type, size, and number of fuel tanks needed at each base.Rate this question:
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- 2.
2. (201) What will horizontal underground storage tanks and cut and cover tanks that issue jet fuel have on top of them?
- A.
A pumphouse
- B.
A concrete cover
- C.
An open-air shed
- D.
Nothing, to prevent collapse of the tank
Correct Answer
A. A pumphouseExplanation
Horizontal underground storage tanks and cut and cover tanks that issue jet fuel will have a pumphouse on top of them. A pumphouse is necessary to house the pumps and equipment required to transfer the jet fuel to and from the tanks. This ensures that the fuel can be efficiently and safely stored and distributed.Rate this question:
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- 3.
(201) All new tanks must have what kind of containment?
- A.
A plastic liner
- B.
Leak detection
- C.
A concrete bottom
- D.
Double-wall construction or a dike
Correct Answer
D. Double-wall construction or a dikeExplanation
All new tanks must have double-wall construction or a dike for containment in order to prevent leaks and spills. This requirement ensures that there are two layers of protection against any potential leaks or failures in the tank. The double-wall construction provides an additional barrier, while a dike acts as a secondary containment system to catch any spills or leaks. These measures are essential for the safe storage and transportation of hazardous materials in tanks.Rate this question:
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- 4.
(201) What should you use when replacing a manway cover?
- A.
New nuts and bolts
- B.
The old gasket if it is in good condition
- C.
A new gasket slightly thicker than the old one
- D.
A new gasket the same thickness as the old one
Correct Answer
D. A new gasket the same thickness as the old oneExplanation
When replacing a manway cover, it is recommended to use a new gasket that is the same thickness as the old one. This ensures a proper seal and prevents any leaks or damage. Using a new gasket of the same thickness as the old one maintains the integrity of the seal and ensures that the manway cover is securely fastened.Rate this question:
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- 5.
(201) Damage to a tank can occur if the
- A.
Vent or vent piping becomes clogged
- B.
Tank has an anti-rotation device
- C.
Low-level shut-off fails to work
- D.
High-level alarm fails to work
Correct Answer
A. Vent or vent piping becomes cloggedExplanation
When the vent or vent piping of a tank becomes clogged, it can lead to damage. The vent is responsible for releasing pressure and allowing air to enter the tank as the liquid level changes. If the vent is blocked, pressure can build up inside the tank, potentially causing it to rupture or explode. Additionally, a clogged vent can create a vacuum inside the tank, which can impede the flow of liquid out of the tank and result in damage. Therefore, when the vent or vent piping becomes clogged, it can lead to harmful consequences for the tank.Rate this question:
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- 6.
(202) Which type of aboveground tank can withstand very little pressure or vacuum during the filling or removal of fuel?
- A.
Vertical.
- B.
Cone roof.
- C.
Floating roof tank.
- D.
Cone roof tank with floating pan.
Correct Answer
B. Cone roof.Explanation
A cone roof tank is designed to withstand very little pressure or vacuum during the filling or removal of fuel. This is because the cone-shaped roof of the tank provides minimal structural support, making it less resistant to pressure or vacuum compared to other types of aboveground tanks such as vertical tanks, floating roof tanks, or cone roof tanks with floating pans.Rate this question:
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- 7.
(202) The product withdrawal line terminate inside a cone roof tank with a floating pan in a
- A.
Vertical position, 6 inches above the top of the sump.
- B.
Vertical position, 6 inches above the bottom of the sump.
- C.
Horizontal position, 6 inches above the top of the sump.
- D.
Horizontal position, 6 inches above the bottom of the sump.
Correct Answer
A. Vertical position, 6 inches above the top of the sump.Explanation
The correct answer is "vertical position, 6 inches above the top of the sump." This means that the product withdrawal line is positioned vertically, with the end of the line located 6 inches above the top of the sump. This positioning allows for efficient withdrawal of the product from the tank while ensuring that any sediment or impurities in the sump are not drawn into the line.Rate this question:
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- 8.
(202) What size is the water draw-off line in an all weather tank, and where does it terminate?
- A.
1⁄2 inch, 1⁄2 inch from the sump bottom.
- B.
1⁄2 inch, 1 inch from the sump bottom.
- C.
3⁄4 inch, 1⁄2 inch from the sump bottom.
- D.
3⁄4 inch, 1 inch from the sump bottom.
Correct Answer
C. 3⁄4 inch, 1⁄2 inch from the sump bottom.Explanation
The correct answer is 3/4 inch, 1/2 inch from the sump bottom. This suggests that the water draw-off line in an all weather tank should have a size of 3/4 inch and should terminate 1/2 inch from the sump bottom.Rate this question:
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- 9.
(202) In the northern hemisphere, which way will the inlet line on an all-weather tank cause the fuel to rotate, and what degree is the line turned?
- A.
Clock-wise, 45.
- B.
Clock-wise, 60.
- C.
Counterclockwise, 45.
- D.
Counterclockwise, 60.
Correct Answer
D. Counterclockwise, 60.Explanation
The correct answer is counterclockwise, 60 degrees. In the northern hemisphere, the Coriolis effect causes fluids to rotate counterclockwise. The inlet line on an all-weather tank is designed to take advantage of this effect and induce rotation in the fuel. The 60-degree turn of the line ensures that the rotation is maximized.Rate this question:
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- 10.
(202) At what level does the high-level alarm actuate on a cone roof with floating pan?
- A.
Just before the high-level shut-off level.
- B.
Just after the high-level shut-off level.
- C.
Just before the high-high level alarm.
- D.
Just after the high-high level alarm.
Correct Answer
A. Just before the high-level shut-off level.Explanation
The high-level alarm on a cone roof with floating pan actuates just before the high-level shut-off level. This means that when the liquid level in the tank reaches just before the shut-off level, the high-level alarm will be triggered. This is an important safety feature to prevent overfilling of the tank and potential spills or leaks.Rate this question:
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- 11.
(202) What level above the tank bottom is the low-level shut-off set at on a 25,000 bbl cone roof tank with floating pan?
- A.
18 inches.
- B.
24 inches.
- C.
27 inches.
- D.
30 inches.
Correct Answer
C. 27 inches.Explanation
The low-level shut-off on a 25,000 bbl cone roof tank with a floating pan is set at 27 inches above the tank bottom. This means that when the liquid level in the tank drops to 27 inches above the bottom, the shut-off mechanism will activate and stop the flow of liquid. This is an important safety feature to prevent the tank from running dry and potentially causing damage or accidents.Rate this question:
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- 12.
(202) At what level are the support legs on a cone roof tank with floating pan set at for day-to-day business?
- A.
11⁄2 feet.
- B.
3 feet.
- C.
41⁄2 feet.
- D.
6 feet.
Correct Answer
B. 3 feet.Explanation
The support legs on a cone roof tank with a floating pan are set at a level of 3 feet for day-to-day business. This height provides stability and support for the tank while allowing for easy access and maintenance.Rate this question:
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- 13.
(202) What type of vent is located on a floating pan?
- A.
Slot
- B.
Open
- C.
Bleeder
- D.
Overflow
Correct Answer
C. BleederExplanation
A bleeder vent is located on a floating pan. This type of vent allows excess pressure or gas to escape from the pan, preventing any build-up that could potentially cause damage or compromise the functionality of the pan.Rate this question:
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- 14.
(203) The wind girder is installed on floating roof tanks to
- A.
Keep the roof from rotating.
- B.
Prevent the collapse of the tank shell.
- C.
Provide a vapor recovery area under the roof.
- D.
Provide a path to the ground for static electricity.
Correct Answer
B. Prevent the collapse of the tank shell.Explanation
The wind girder is installed on floating roof tanks to prevent the collapse of the tank shell. Wind girders are structural components that provide additional support and stability to the tank shell, especially during strong winds or atmospheric pressure changes. By preventing the collapse of the tank shell, the wind girder helps maintain the integrity of the tank and ensures the safety of the stored contents.Rate this question:
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- 15.
(203) The roof guide is installed on floating roof tanks to
- A.
Keep the roof from rotating.
- B.
Prevent the collapse of the tank shell.
- C.
Provide a vapor recovery area under the roof.
- D.
Provide a path to the ground for static electricity.
Correct Answer
A. Keep the roof from rotating.Explanation
The roof guide is installed on floating roof tanks to keep the roof from rotating. This is important because the roof of a floating roof tank is designed to float on the surface of the liquid stored inside the tank. Without a roof guide, the roof could potentially rotate or move out of position, which could lead to stability issues and potential damage to the tank. Therefore, the installation of a roof guide ensures that the roof remains in the correct position and prevents any rotation or movement.Rate this question:
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- 16.
(203) The double-deck floating roof tank is the most efficient type of roof because the roof
- A.
Slopes to the center.
- B.
Support legs are adjustable.
- C.
Has insulating air space between decks.
- D.
Water drains easily toward the center.
Correct Answer
C. Has insulating air space between decks.Explanation
The double-deck floating roof tank is the most efficient type of roof because it has insulating air space between decks. This insulating air space helps to reduce the evaporation of stored liquids by minimizing the contact between the stored liquid and the atmosphere. This design feature helps to maintain the temperature and quality of the stored liquid, making it an efficient choice for storage tanks.Rate this question:
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- 17.
(204) About how far above the tank floor is the first stage of the deep-well turbine pump located?
- A.
3 inches.
- B.
6 inches.
- C.
9 inches.
- D.
12 inches.
Correct Answer
B. 6 inches.Explanation
The first stage of the deep-well turbine pump is located approximately 6 inches above the tank floor.Rate this question:
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- 18.
(204) What size is the cleanout line on an underground tank, and where does it terminate outside the tank?
- A.
1⁄2 inch, 6 inches above ground level.
- B.
1⁄2 inch, 12 inches above ground level.
- C.
3⁄4 inch, 6 inches above ground level.
- D.
3⁄4 inch, 12 inches above ground level.
Correct Answer
D. 3⁄4 inch, 12 inches above ground level.Explanation
The cleanout line on an underground tank is typically 3/4 inch in size. It terminates 12 inches above ground level.Rate this question:
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- 19.
(205) You must clean a bulk storage tank that has a receiving filter separator and is internally coated every
- A.
4 years.
- B.
6 years.
- C.
8 years.
- D.
10 years.
Correct Answer
C. 8 years.Explanation
The bulk storage tank needs to be cleaned every 8 years because it has a receiving filter separator and is internally coated. The receiving filter separator helps to remove impurities and contaminants from the incoming fluid, ensuring that the tank remains clean. Additionally, the internal coating helps to protect the tank from corrosion and other damage, reducing the need for frequent cleaning. Therefore, cleaning the tank every 8 years strikes a balance between maintaining cleanliness and preserving the integrity of the tank.Rate this question:
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- 20.
(205) You must clean an operating storage tank that does not have a receiving filter separator but has internal coating every
- A.
4 years
- B.
6 years
- C.
8 years
- D.
10 years
Correct Answer
B. 6 yearsExplanation
The correct answer is 6 years. Operating storage tanks without a receiving filter separator but with internal coating should be cleaned every 6 years. The internal coating helps to prevent corrosion and buildup of contaminants, but over time, these coatings can degrade and become less effective. Cleaning the tank every 6 years ensures that any accumulated debris or contaminants are removed, maintaining the integrity and effectiveness of the coating and ensuring the tank operates efficiently.Rate this question:
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- 21.
(205) You must clean an operating tank that is not internally coated and does not have a receiving filter separator every
- A.
4 years.
- B.
6 years.
- C.
8 years.
- D.
10 years.
Correct Answer
A. 4 years.Explanation
The operating tank needs to be cleaned every 4 years because it is not internally coated and does not have a receiving filter separator. Without these protective measures, the tank is more susceptible to build-up of debris, sediment, and contaminants over time. Regular cleaning ensures the tank remains in optimal condition and prevents any potential issues that could arise from the accumulation of unwanted substances.Rate this question:
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- 22.
(205) How often do you clean a Mogas or diesel tank?
- A.
4 years.
- B.
6 years.
- C.
8 years.
- D.
By direction of the fuels management office.
Correct Answer
D. By direction of the fuels management office. -
- 23.
(205) How is the product identification displayed on an aboveground tank?
- A.
Yellow bands with white letters on a black background.
- B.
Yellow bands with black letters on a white background.
- C.
Black bands with white letters on a yellow background.
- D.
Black bands with yellow letters on a white background.
Correct Answer
A. Yellow bands with white letters on a black background.Explanation
The product identification on an aboveground tank is displayed using yellow bands with white letters on a black background.Rate this question:
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- 24.
(205) How many bands are used to identify JP–8 fuel?
- A.
One
- B.
Two
- C.
Three
- D.
Four
Correct Answer
C. ThreeExplanation
JP-8 fuel is identified by three bands.Rate this question:
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- 25.
206) The fuse link on a fuse link valve used on a cone roof tank will normally melt at what temperature?
- A.
160° F.
- B.
180° F.
- C.
200° F.
- D.
220° F.
Correct Answer
A. 160° F.Explanation
The fuse link on a fuse link valve is designed to melt at a specific temperature in order to release pressure and prevent over-pressurization of the tank. In this case, the correct answer is 160° F, meaning that the fuse link will melt and activate the valve when the temperature reaches or exceeds this threshold.Rate this question:
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- 26.
(206) When manually gauging a tank, why must you keep the tape in contact with the gauge pipe?
- A.
To keep the tape from twisting.
- B.
To easily read the tape increments.
- C.
To prevent the discharge of a spark.
- D.
To steady the tape when lowering the bob.
Correct Answer
C. To prevent the discharge of a spark.Explanation
When manually gauging a tank, keeping the tape in contact with the gauge pipe is necessary to prevent the discharge of a spark. This is important because tanks often contain flammable substances, and a spark could potentially ignite these substances, leading to a dangerous explosion or fire. By maintaining contact between the tape and the gauge pipe, any potential sparks that may occur during the gauging process are minimized, ensuring the safety of the operator and the surrounding environment.Rate this question:
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- 27.
(207) When the roof supports on a floating roof tank are in the UP position, at what level will the roof rest above the floor?
- A.
3 feet.
- B.
4 feet.
- C.
5 feet.
- D.
6 feet.
Correct Answer
A. 3 feet.Explanation
When the roof supports on a floating roof tank are in the UP position, the roof will rest 3 feet above the floor.Rate this question:
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- 28.
(207) At what level must the automatic bleeder vent supports be set when preparing for an internal inspection and cleaning?
- A.
3 feet.
- B.
4 feet.
- C.
5 feet.
- D.
6 feet.
Correct Answer
D. 6 feet.Explanation
The automatic bleeder vent supports must be set at a level of 6 feet when preparing for an internal inspection and cleaning. This height ensures that the vent supports are positioned high enough to prevent any obstruction or interference during the inspection and cleaning process. By setting the vent supports at 6 feet, it allows for sufficient clearance and accessibility to effectively carry out the necessary tasks.Rate this question:
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- 29.
(207) What prevents fuel from entering a roof drain line?
- A.
Flange gaskets and Teflon® ring packing.
- B.
Flange gaskets and asbestos ring packing.
- C.
Threaded gaskets and Teflon® ring packing.
- D.
Threaded gaskets and asbestos ring packing.
Correct Answer
B. Flange gaskets and asbestos ring packing.Explanation
Flange gaskets and asbestos ring packing prevent fuel from entering a roof drain line. These components create a tight seal between the flanges, preventing any leakage of fuel. Asbestos ring packing is known for its resistance to heat and chemicals, making it an effective barrier against fuel. The use of flange gaskets further enhances the sealing capability, ensuring that no fuel can escape through the drain line.Rate this question:
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- 30.
(207) In extremely cold climates, what should you do to the roof drain line?
- A.
Fill it with salt water.
- B.
Fill it with antifreeze only.
- C.
Fill it with 10 SAE weight oil.
- D.
Fill it with 50/50 mix of antifreeze and water.
Correct Answer
D. Fill it with 50/50 mix of antifreeze and water.Explanation
In extremely cold climates, filling the roof drain line with a 50/50 mix of antifreeze and water is the correct answer. This mixture helps prevent the water in the drain line from freezing, which can cause blockages and potential damage to the roof. Antifreeze lowers the freezing point of water, making it less likely to freeze in cold temperatures. Using a 50/50 mix ensures that the antifreeze is at the proper concentration to effectively prevent freezing.Rate this question:
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- 31.
(207) What is the inspection frequency for the fabric seal on a floating roof tank?
- A.
Weekly.
- B.
Monthly.
- C.
Semi-annual.
- D.
Annually.
Correct Answer
B. Monthly.Explanation
The fabric seal on a floating roof tank needs to be inspected on a regular basis to ensure its integrity and prevent any leaks or damage. Inspecting the fabric seal monthly allows for early detection of any issues and timely repairs or replacements if necessary. This frequency strikes a balance between frequent enough to catch potential problems and not too burdensome in terms of time and resources.Rate this question:
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- 32.
(207) When filling the tank to check the high-high-level alarm, what must be disabled?
- A.
The high-level alarm.
- B.
The low-level switch.
- C.
The low-level shut-off valve.
- D.
The high-level shut-off valve.
Correct Answer
D. The high-level shut-off valve.Explanation
When filling the tank to check the high-high-level alarm, the high-level shut-off valve must be disabled. This is because the shut-off valve is responsible for stopping the flow of liquid into the tank when it reaches a certain level. By disabling the shut-off valve, the liquid can continue to flow into the tank and trigger the high-high-level alarm, allowing for the proper testing of the alarm system.Rate this question:
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- 33.
(208) What would you use to check the liquidometer accuracy?
- A.
Tape and bob.
- B.
Liquid level float.
- C.
Liquid level gauge.
- D.
Weighted gauge tester.
Correct Answer
A. Tape and bob.Explanation
To check the liquidometer accuracy, one would use a tape and bob. A tape and bob is a measuring device that consists of a tape measure and a weighted bob attached to the end. The tape is lowered into the liquid and the bob settles at the liquid's surface, indicating the level. This method is commonly used to measure the accuracy of liquid levels in tanks or containers.Rate this question:
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- 34.
(208) How would you take care of internal corrosion for the low-level control attached to the liquidometer?
- A.
Wire brush clean and replace the cover gasket.
- B.
Wire brush clean and replace the cover.
- C.
Air it out and replace the cover gasket.
- D.
Air it out and replace the cover.
Correct Answer
A. Wire brush clean and replace the cover gasket.Explanation
To take care of internal corrosion for the low-level control attached to the liquidometer, wire brushing the area clean and replacing the cover gasket is the appropriate solution. This process helps remove any corrosion buildup and ensures a tight seal with the new gasket, preventing further corrosion. Airing out the area alone would not address the internal corrosion issue, and replacing the cover without cleaning it would not effectively remove the corrosion. Therefore, wire brushing and replacing the cover gasket is the most suitable method.Rate this question:
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- 35.
(209) How long before entering a fuel tank must you request permission from your MAJCOM?
- A.
10 days.
- B.
15 days.
- C.
10 workdays.
- D.
15 workdays.
Correct Answer
D. 15 workdays.Explanation
Before entering a fuel tank, you must request permission from your MAJCOM 15 workdays in advance. This allows for proper planning and coordination to ensure the safety and efficiency of the operation. Requesting permission within this timeframe allows the MAJCOM to review and approve the request, allocate necessary resources, and address any potential issues or concerns. It also allows for any necessary inspections or maintenance to be conducted prior to entering the fuel tank.Rate this question:
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- 36.
(209) Who will assign a qualified tank entry supervisor to supervise a tank cleaning operation?
- A.
Shop supervisor.
- B.
Section superintendent.
- C.
Base safety.
- D.
MAJCOM fuels engineer.
Correct Answer
D. MAJCOM fuels engineer.Explanation
The MAJCOM fuels engineer will assign a qualified tank entry supervisor to supervise a tank cleaning operation. This is because the MAJCOM fuels engineer is responsible for overseeing fuel operations and ensuring safety protocols are followed. They have the knowledge and expertise to determine the qualifications needed for a tank entry supervisor and can make the appropriate assignment. The shop supervisor, section superintendent, and base safety may have some involvement in the operation, but the ultimate responsibility lies with the MAJCOM fuels engineer.Rate this question:
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- 37.
(209) Which one of the following is not the responsibility of the MAJCOM fuels engineer’s representative during the contract cleaning of a fuel tank?
- A.
To inspect the contractor’s equipment.
- B.
To advise the contractor of known potential hazards.
- C.
To stop the contractor’s work for contract violations.
- D.
To act as the quality assurance evaluator pertaining to the work.
Correct Answer
C. To stop the contractor’s work for contract violations.Explanation
The responsibility of the MAJCOM fuels engineer's representative during the contract cleaning of a fuel tank includes inspecting the contractor's equipment, advising the contractor of known potential hazards, and acting as the quality assurance evaluator pertaining to the work. However, it is not their responsibility to stop the contractor's work for contract violations. This duty would typically fall under the jurisdiction of a contract manager or supervisor.Rate this question:
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- 38.
(210) Which of the following fuels normally contains a higher concentration of benzene?
- A.
JP–4.
- B.
JP–8.
- C.
Diesel.
- D.
Gasoline.
Correct Answer
D. Gasoline.Explanation
Gasoline normally contains a higher concentration of benzene compared to the other fuels listed. Benzene is a component of gasoline and is added to improve its octane rating. Diesel fuel, JP-4, and JP-8 are all types of aviation fuels and do not typically contain as high of a concentration of benzene as gasoline.Rate this question:
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- 39.
(211) During tank cleaning, when should you remove heavily contaminated clothing?
- A.
Immediately, after leaving the area.
- B.
After being drenched with water
- C.
At the end of the day, after leaving the area.
- D.
At the end of the day, after being drenched with water.
Correct Answer
B. After being drenched with waterExplanation
Removing heavily contaminated clothing after being drenched with water is the correct answer because water can help to dilute and wash away the contaminants, reducing the risk of exposure. By waiting until after being drenched with water, it ensures that the clothing has been thoroughly rinsed, minimizing the potential for contamination during the removal process. Removing the clothing immediately after leaving the area or at the end of the day without being drenched with water may result in spreading the contaminants or increasing the risk of exposure.Rate this question:
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- 40.
(211) Communication gear must be used during the cleaning of an underground JP–8 tank when the
- A.
Tank capacity is 10,000 gallons.
- B.
Tank capacity is 25,000 gallons.
- C.
Manhole access is 6 feet below ground level.
- D.
Manhole access is 12 feet below ground level.
Correct Answer
D. Manhole access is 12 feet below ground level. -
- 41.
(211) All electrical equipment to be used within 50 feet of any fuel system must be defined as which class in the National Electrical Code?
- A.
Class I, Division I, Group C.
- B.
Class I, Division I, Group D.
- C.
Class I, Division II, Group C.
- D.
Class I, Division II, Group D.
Correct Answer
B. Class I, Division I, Group D.Explanation
Electrical equipment that is to be used within 50 feet of any fuel system must be defined as Class I, Division I, Group D according to the National Electrical Code. This classification ensures that the equipment is suitable for use in hazardous locations where flammable gases or vapors may be present. Class I refers to locations where flammable gases or vapors are present, Division I indicates that the hazard is present continuously or frequently, and Group D specifies that the flammable material is a gas or vapor with a lower explosive limit greater than 0.75%.Rate this question:
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- 42.
(211) A safety harness, used in tank cleaning, is good for a maximum of how many years from the date stamped on the harness?
- A.
5
- B.
10
- C.
15
- D.
20
Correct Answer
B. 10Explanation
A safety harness used in tank cleaning is good for a maximum of 10 years from the date stamped on the harness. This means that after 10 years, the safety harness may no longer be safe to use and should be replaced. Regular inspection and maintenance of the harness is also necessary to ensure its effectiveness and safety.Rate this question:
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- 43.
(212) Artificial lights, other than battery-powered safety lanterns, can be used only during tank cleaning after what condition is met?
- A.
The tank cleaning supervisor has made their initial entry.
- B.
The LEL inside the tank is below 20 percent.
- C.
The tank has been washed down.
- D.
The tank is vapor free.
Correct Answer
D. The tank is vapor free.Explanation
Artificial lights, other than battery-powered safety lanterns, can be used only during tank cleaning after the tank is vapor free. This means that all vapors and gases inside the tank have been removed, making it safe to use artificial lights without the risk of ignition or explosion. The other conditions mentioned, such as the tank cleaning supervisor making their initial entry, the LEL (Lower Explosive Limit) being below 20 percent, and the tank being washed down, are important steps in the tank cleaning process but do not specifically relate to the use of artificial lights.Rate this question:
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- 44.
(212) During initial cleaning, at what percent of the lower explosive limit (LEL) must you suspend washing down a tank?
- A.
10
- B.
20
- C.
30
- D.
40
Correct Answer
B. 20Explanation
During the initial cleaning of a tank, it is necessary to suspend washing down the tank when the concentration of the substance being cleaned is at 20% of the lower explosive limit (LEL). This precaution is taken to prevent the risk of an explosion, as concentrations below this threshold are considered safe.Rate this question:
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- 45.
(212) At what vapor level may workers initially enter a tank for tank cleaning?
- A.
Below 10 percent LEL.
- B.
Below 20 percent LEL.
- C.
Below 40 percent LEL.
- D.
Below 50 percent LEL.
Correct Answer
A. Below 10 percent LEL.Explanation
Workers may initially enter a tank for tank cleaning when the vapor level is below 10 percent LEL. This is because LEL (Lower Explosive Limit) is the minimum concentration of a flammable substance in the air that can ignite and cause an explosion. Therefore, to ensure safety, workers should only enter a tank when the vapor level is below this threshold to minimize the risk of an explosion.Rate this question:
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- 46.
(212) During tank cleaning, how often must you record a vapor reading?
- A.
Every 10 minutes.
- B.
Every 15 minutes.
- C.
At the beginning of the tank cleaning.
- D.
At the beginning and end of the tank cleaning.
Correct Answer
B. Every 15 minutes.Explanation
During tank cleaning, it is necessary to record a vapor reading every 15 minutes. This is important to monitor the level of vapors in the tank and ensure that they are within safe limits. By recording the vapor reading at regular intervals, any potential hazards or changes in vapor levels can be identified and addressed promptly. This helps to maintain a safe working environment during tank cleaning operations.Rate this question:
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- 47.
(212) When can people enter a fuel tank without protective equipment?
- A.
0 percent LEL only.
- B.
0 percent LEL and the tank has been washed out and dried.
- C.
0 percent LEL, the tank has been washed out and dried, the tank is known never to have contained leaded fuel, and the Bioenvironmental Engineer has approved their entry.
- D.
Never.
Correct Answer
C. 0 percent LEL, the tank has been washed out and dried, the tank is known never to have contained leaded fuel, and the Bioenvironmental Engineer has approved their entry.Explanation
People can enter a fuel tank without protective equipment if the tank has 0 percent LEL, it has been washed out and dried, it is known to have never contained leaded fuel, and the entry has been approved by the Bioenvironmental Engineer.Rate this question:
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- 48.
(213) What must be done to fuel pumps and motors located in a pit if they are to be abandoned?
- A.
Drained only.
- B.
Drained and capped off.
- C.
Remove, capped off and oiled.
- D.
Removed and stored in a dry place.
Correct Answer
D. Removed and stored in a dry place.Explanation
To properly abandon fuel pumps and motors located in a pit, they must be removed and stored in a dry place. This ensures that they are completely taken out of the pit and kept in a safe and dry environment. Simply draining them or capping them off would not be sufficient for proper abandonment. Oiling them is also not necessary in this case.Rate this question:
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- 49.
(213) What must be done to meters in a pit that is to be abandoned?
- A.
Drained only.
- B.
Drained and capped off.
- C.
Drained, capped off and oiled.
- D.
Drained, removed, oiled, and placed in storage.
Correct Answer
D. Drained, removed, oiled, and placed in storage.Explanation
When a pit is to be abandoned, the meters must be drained, removed, oiled, and placed in storage. This ensures that the meters are properly prepared for long-term storage and protected from damage or deterioration. Draining the meters removes any remaining fluids, removing them prevents any potential hazards or contamination, oiling helps to prevent rust or corrosion, and placing them in storage ensures they are safely stored until they are needed again.Rate this question:
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- 50.
(214) How do you reset the lower explosive limit (LEL) sensor on the MultiRAE PGM–50?
- A.
Press the “reset” button.
- B.
Sample fresh air for 60 seconds then press the “Y/+” button.
- C.
Turn the unit off then back on.
- D.
PMEL must replace the sensor.
Correct Answer
B. Sample fresh air for 60 seconds then press the “Y/+” button.Explanation
To reset the lower explosive limit (LEL) sensor on the MultiRAE PGM-50, you need to sample fresh air for 60 seconds and then press the "Y/+" button. This process allows the sensor to recalibrate and ensure accurate readings. Pressing the "reset" button or turning the unit off and on will not reset the LEL sensor. If the sensor is faulty and cannot be reset, it needs to be replaced by PMEL.Rate this question:
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Ch. 1 s and p Block Elements (topic 13.2 and 13.3)
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