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CDL tanker vehicles practice test 3

20 more questions on tanker vehicles, written from the Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0).

20 questions

  1. Question 1Your empty tank trailer, last used for gasoline, breaks down on the highway. Which warning devices may you NOT use?

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    D: Flares or fusees. Flares, fusees and other burning signals are banned around tanks used for Class 3 flammable liquids or Division 2.1 flammable gas, even when empty. Use reflective triangles or red electric lights. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.6.4 No Flares!, page 9-14.

  2. Question 2Why do different liquids require different amounts of outage?

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    D: Because different liquids expand by different amounts. Each liquid expands at its own rate, so each needs a different outage. Know the outage requirement for what you haul. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 8.2.6 Outage, page 8-2.

  3. Question 3Dry bulk tanks need special care because of what?

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    C: A high center of gravity and a load that can shift. Dry bulk tanks have a high center of gravity and the load can shift, so be extremely cautious going around curves and making sharp turns. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 3.4.1 Dry Bulk, page 3-3.

  4. Question 4How far may you continue driving a cargo tank that is leaking?

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    B: Only as far as needed to reach a safe place. A leaking cargo tank should go no farther than it takes to reach a safe spot. Pull off the road if you can do it safely. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.7.4 Responses to Specific Hazards: Class 3 (Flammable Liquids), page 9-16.

  5. Question 5Why might you only partially fill a tank with a dense liquid such as some acids?

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    A: A full tank of dense liquid may exceed legal weight limits. Heavy liquids such as some acids can push a full tank over the legal weight limit, so these tanks are often only partly filled. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 8.2.7 How Much to Load?, page 8-2.

  6. Question 6A cargo tank that has been used for hazardous materials but is now empty reaches a railroad crossing. What must the driver do?

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    C: Stop 15 to 50 feet from the nearest rail before crossing. Cargo tanks used for hazardous materials must stop at railroad crossings, loaded or empty, 15 to 50 feet before the nearest rail (49 CFR 392.10). Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.6.12 Stop before Railroad Crossings, page 9-15.

  7. Question 7What does the manual say about jamming on the brakes in an emergency?

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    C: It keeps the wheels locked and causes a skid, so you cannot control the vehicle. Emergency braking does not mean pushing the pedal as hard as you can; that keeps the wheels locked and causes a skid you can't control. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 2.17.2 How to Stop Quickly and Safely, page 2-34.

  8. Question 8Which three things determine how much liquid you can load into a tank?

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    B: The amount it will expand in transit, the weight of the liquid, and legal weight limits. The amount to load depends on how much the liquid will expand in transit, the weight of the liquid and legal weight limits. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 8.2.7 How Much to Load?, page 8-2.

  9. Question 9Because of the high center of gravity and liquid surge, how should you drive a tank vehicle?

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    C: Start, slow down and stop very smoothly, and make smooth turns and lane changes. You must start, slow down and stop very smoothly, and make smooth turns and lane changes. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 8.3.1 Drive Smoothly, page 8-2.

  10. Question 10How should you use the brakes to help control surge when coming to a stop?

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    D: Keep steady pressure on the brakes and don't release too soon. Keep a steady pressure on the brakes and do not release too soon when coming to a stop. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 8.3.2 Controlling Surge, page 8-2.

  11. Question 11What is a cargo tank?

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    C: Bulk packaging permanently attached to a vehicle that stays on the vehicle during loading and unloading. Cargo tanks are bulk packaging permanently attached to a vehicle; they remain on the vehicle when you load and unload them. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.5 Bulk Packaging Marking, Loading and Unloading, page 9-12.

  12. Question 12How is a portable tank loaded and unloaded?

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    D: While it is off the vehicle; it is then put on a vehicle for transportation. Portable tanks are not permanently attached; the product is loaded or unloaded while the portable tank is off the vehicle. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.5 Bulk Packaging Marking, Loading and Unloading, page 9-12.

  13. Question 13Which cargo tank type does the manual name as the most common for liquids?

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    A: MC306. The manual names the MC306 as the most common cargo tank for liquids. The MC331 is the common one for gases. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.5 Bulk Packaging Marking, Loading and Unloading, page 9-12.

  14. Question 14A hazmat cargo tank is being loaded. Where must the qualified person watching it be?

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    B: Within 25 feet of the tank with a clear view of it. The person watching loading or unloading must be alert, within 25 feet, have a clear view of the cargo tank and be able to move it (49 CFR 177.834). Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.5.2 Tank Loading, page 9-13.

  15. Question 15According to the manual, which cargo tank loads have special attendance rules?

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    C: Propane and anhydrous ammonia. The manual notes that cargo tanks hauling propane or anhydrous ammonia have their own special attendance rules. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.5.2 Tank Loading, page 9-13.

  16. Question 16When may you move a hazmat cargo tank with open valves or covers?

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    D: Only when it is empty according to 49 CFR 173.29. Close all manholes and valves before moving a hazmat tank no matter how small the amount or short the distance; moving it with open valves or covers is illegal unless it is empty under 49 CFR 173.29. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.5.2 Tank Loading, page 9-13.

  17. Question 17When loading a flammable liquid through an open filling hole, what must you do to the cargo tank?

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    A: Ground it before opening the filling hole and keep it grounded until after closing it. Ground the tank correctly before opening the filling hole and maintain the ground until after the filling hole is closed (49 CFR 177.837(c)). Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.5.3 Flammable Liquids, page 9-13.

  18. Question 18Your engine runs the pump for unloading compressed gas. When do you shut it off?

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    B: After the product transfer, before you unhook the hose. If the engine runs the pump, turn it off after the product transfer and before you unhook the hose. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.5.4 Compressed Gas, page 9-13.

  19. Question 19What should you always do with trailers and semitrailers carrying compressed gas tanks when they are uncoupled from the power unit?

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    C: Chock them to prevent motion. Always chock trailers and semitrailers to prevent motion when they are uncoupled from the power unit. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.5.4 Compressed Gas, page 9-13.

  20. Question 20How close to an empty placarded tank last used for gasoline may someone smoke?

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    A: Not within 25 feet. The manual bans smoking within 25 feet of a placarded cargo tank used for Class 3 or Division 2.1 materials. 49 CFR 397.13(b) applies the same 25-foot rule to such tanks when empty. Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0): 9.6.6 No Smoking, page 9-14.

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Our own questions, written from the Missouri Commercial Driver License Manual (AAMVA model CDL manual, Version 4.0), official manual, and checked against it.