Tanker (N) Endorsement CDL Practice Test

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  1. You are driving a tanker with a partially filled cargo tank and you come to a stop. What happens inside the tank, and how can it affect your truck?
  2. Why does liquid surge create a special hazard specifically during starting, slowing down, and stopping a tank vehicle, rather than during steady-speed driving?
  3. A tanker driver releases the brake pedal too abruptly partway through coming to a stop. Based on how liquid surge works, what risk does this create?
  4. A tanker is stopped at a red light on an icy road, with the driver holding the brakes firmly and the tank partially filled. Based on how liquid surge works, what could still happen?
  5. Why is the combination of liquid surge and an icy road especially dangerous for a tank vehicle driver, compared to surge on dry pavement?
  6. You are approaching an intersection with a known icy patch while driving a partially loaded tanker. Based on how surge and slippery surfaces interact, which statement reflects the safest way to think about being stopped there?
  7. A tank vehicle is equipped with baffles inside the cargo tank. What type of liquid surge are baffles designed to help control?
  8. A tanker is equipped with baffles, yet it can still roll over due to liquid movement inside the tank. What explains this?
  9. A driver assumes that because their tanker has baffles installed, they can take curves faster without any added rollover risk from liquid movement. What is the flaw in this assumption?
  10. According to how liquid surge is described for tank vehicles, which loading condition is specifically responsible for causing surge?
  11. A dispatcher offers a driver a choice between hauling a partially filled tank or a completely full tank of the same liquid over the same route. Based on what causes surge, which load presents the greater surge-handling challenge?
  12. Why might a tanker hauling a partial load of liquid require different driving habits than one hauling a completely full load of the same liquid?
  13. You are driving a tank vehicle and begin braking to come to a stop at a red light. According to CDL guidance for tank vehicles, what should you do with brake pressure as the vehicle slows?
  14. Why does the CDL manual instruct tank vehicle drivers to brake far in advance of a stop and increase their following distance?
  15. A tank vehicle driver approaching a stop sign releases the brake pedal just before the truck comes to a complete stop, and the truck lurches forward slightly. What mistake did the driver make?
  16. If a tank vehicle driver must make a quick stop to avoid a crash, what braking technique does the CDL manual recommend?
  17. What does the CDL manual warn can happen if a tank vehicle driver steers quickly while braking?
  18. A tank vehicle driver sees an obstacle in the road and needs to slow down quickly while also steering around it. What does CDL guidance say about this situation?
  19. According to the CDL manual, how do wet roads affect the stopping distance of a tank vehicle compared to dry roads?
  20. Which of the following is true regarding stopping distance for tank vehicles, according to the CDL manual?
  21. A driver is hauling an empty tank vehicle, just unloaded, on a rainy day. How should the driver adjust their stopping distance compared to a normal, loaded, dry-road stop?
  22. What is a baffled liquid tank, as described in the CDL manual?
  23. Baffles in a liquid tank help control surge in which direction, according to the CDL manual?
  24. How do bulkheads differ from baffles in a tank vehicle, based on the CDL manual?
  25. What distinguishes an un-baffled, or "smooth bore," cargo tank from other liquid tanks?
  26. Why must a driver be extremely cautious, especially when starting and stopping, in an un-baffled tank vehicle?
  27. Which term does the AAMVA CDL Manual use interchangeably with "un-baffled" to describe a liquid cargo tank's construction?
  28. Why are un-baffled tanks typically the ones chosen for hauling food products such as milk?
  29. What sanitation problem would baffles create inside a tank used to haul milk?
  30. A driver is told their tank vehicle is un-baffled and hauls only dairy products. What should this tell the driver about the ride?
  31. What is the purpose of bulkheads in a liquid cargo tank?
  32. When loading or unloading individual compartments of a bulkheaded tank, what must the driver pay close attention to?
  33. A driver unloads only the rearmost compartments of a bulkheaded tanker first, leaving the front compartments full. What risk does AAMVA guidance say this creates?
  34. What is the key difference between a bulkhead and a baffle in a liquid cargo tank, as described in the AAMVA Manual?
  35. What feature allows a baffled tank to control forward-and-backward surge while still holding one continuous volume of cargo in that compartment?
  36. The AAMVA Manual's Section 8 "Test Your Knowledge" review opens with a question asking drivers to explain a distinction. Which distinction is it?
  37. During a pre-trip inspection of any tank vehicle, what is the single most important item to check?
  38. Before loading, unloading, or moving a tank vehicle, which valves must you confirm are in the correct position?
  39. What should a driver verify about manhole covers and vents during a tank vehicle inspection?
  40. According to the AAMVA CDL Manual, what happens to a driver found operating a tank vehicle with a leaking tank?
  41. Besides being cited and stopped from driving, what additional liability might a driver face for hauling liquid in a leaking tank?
  42. How does the AAMVA CDL Manual characterize carrying liquid or gas in a leaking tank?
  43. If a tank vehicle is equipped with vapor recovery kits, grounding and bonding cables, or an emergency shut-off system, what must the driver do before driving?
  44. According to the AAMVA CDL Manual, what should a driver never do when operating a tank vehicle?
  45. What is the purpose of grounding and bonding cables checked as special-purpose equipment on some tank vehicles?
  46. What must a tank vehicle driver do regarding emergency equipment during the pre-trip inspection?
  47. Which combination of emergency warning devices satisfies the federal requirement and the AAMVA Vehicle Inspection Supplement checklist used for tank vehicle inspections?
  48. Why does the AAMVA CDL Manual direct drivers to confirm emergency equipment both is present and works, rather than just checking that it is present?
  49. Under the CDL tank vehicle rules, what individual tank capacity triggers the need for a tank endorsement on a Class A or Class B vehicle?
  50. A Class A combination vehicle carries three separate tanks, each rated at 150 gallons, for a total aggregate capacity of 450 gallons. Does this configuration require a tank endorsement?
  51. A Class C vehicle is used to haul a non-hazardous liquid in a single 500-gallon tank. Is a tank endorsement required for this trip?
  52. Why are loaded liquid tank vehicles especially prone to rolling over compared to many other types of cargo?
  53. According to the CDL manual, tests have shown that loaded tankers can roll over under which of the following conditions?
  54. A driver is hauling a full liquid tanker and approaches a curve with a posted advisory speed of 35 mph. What should the driver understand about that posted speed?
  55. When approaching highway curves, on-ramps, and off-ramps while driving a loaded tank vehicle, what should a driver do?
  56. Why does the CDL manual specifically call out on-ramp and off-ramp curves as a rollover concern for tank vehicle drivers?
  57. What throttle technique does the CDL manual recommend for a tank vehicle driver going through a curve?
  58. Why might the speed posted for a curve still be unsafe for a tank vehicle driver to maintain all the way through the turn?
  59. What sequence of speed and throttle actions does the CDL manual recommend for a tank vehicle driver negotiating a curve, to maintain control and stability?
  60. Because of a tank vehicle's high center of gravity and the movement of liquid inside a partially filled tank, how should a driver handle starting, slowing, stopping, and turning?
  61. According to the CDL manual, how should a tanker driver approach highway curves, on-ramps, and off-ramps compared to the posted speed limit for those curves?
  62. What braking technique does the CDL manual recommend to help control liquid surge when bringing a partially filled tank vehicle to a stop?
  63. What three types of driver inputs does the CDL manual identify as causes of a skid in a tank vehicle?
  64. On a tank trailer specifically, what can happen if the drive wheels or the trailer wheels begin to skid?
  65. According to the CDL manual, what must a driver do when any vehicle, including a tank vehicle, starts to skid?
  66. In tank vehicle loading, what does the term "outage" refer to?
  67. Why does the CDL manual instruct drivers to never load a cargo tank totally full?
  68. Why does the required outage percentage differ from one liquid to another?
  69. Why might a driver only partially fill a tank when hauling a dense liquid such as some acids?
  70. According to the CDL manual, what three factors determine how much liquid a driver should load into a tank?
  71. What is the practical risk the CDL manual describes if a driver loads a tank completely full with a dense, heavy liquid?
  72. According to the CDL manual, what three factors determine how much liquid a driver can load into a cargo tank?
  73. A driver is preparing to load a dense liquid such as a strong acid into a cargo tank. Why might the driver only partially fill the tank, even though it has more physical capacity available?
  74. The AAMVA CDL Manual explains that 'outage' requirements differ between liquids. What is the stated reason different liquids require different amounts of outage?
  75. Besides Section 8 (Tank Vehicles), which other sections of the CDL manual does the manual say a tanker endorsement candidate should also study?
  76. A driver preparing for the tanker endorsement exam wonders whether they need to review the Air Brakes section, since that's tested as a separate endorsement. What does the CDL manual direct?
  77. A tanker endorsement candidate has thoroughly studied Section 8 but skips Section 9 (Hazardous Materials) because they don't plan to haul placarded loads. Is skipping Section 9 consistent with the CDL manual's own study guidance?
  78. Which DOT cargo tank specification is a non-pressure tank with a maximum allowable working pressure (MAWP) of only 2.65 to 4 psig, commonly used to haul gasoline and other petroleum products?
  79. A carrier needs a cargo tank built to the DOT 407 specification. What design requirement does 49 CFR 178.347 set that distinguishes it from a DOT 406 tank?
  80. Which cargo tank specification is built as a double-walled, insulated vessel with a vacuum-jacket option, designed specifically to keep cryogenic liquids at the required low temperature during transport?
  81. A cargo tank must be certified as an ASME Code Section VIII pressure vessel with a design pressure between 100 and 500 psi, set no lower than the cargo's vapor pressure at 115°F. Which DOT cargo tank specification is this?
  82. Under 49 CFR 180.407, how often must most DOT specification cargo tanks undergo a periodic pressure (hydrostatic or pneumatic) retest?
  83. A fleet maintenance manager schedules external visual inspections and leakage tests on a cargo tank every year, but schedules the full pressure (hydrostatic) retest only every 5 years. Is this schedule consistent with 49 CFR 180.407?
  84. According to 49 CFR 180.407, which type of specialized cargo tank is subject to a shorter periodic pressure retest interval than the standard 5-year interval required for most cargo tanks?
  85. Under 49 CFR 180.407, what is the standard periodic pressure retest interval that applies to most DOT specification cargo tanks, unless a specific exception applies?
  86. A cargo tank is insulated and has no manhole opening for internal access. Under 49 CFR 180.407, how often must this tank undergo its periodic pressure retest?
  87. A cargo tank is designed for vacuum loading and has a full-opening rear head. Per 49 CFR 180.407, what periodic pressure retest interval applies to this tank?
  88. A driver hauls propane in an MC 331 cargo tank under 3,500 gallons capacity, built of non-quenched-and-tempered (NQT) steel, in dedicated propane service. Under 49 CFR 180.407, what is the periodic pressure retest interval for this tank?
  89. Under 49 CFR 180.407, how often must most DOT cargo tanks receive an external visual inspection?
  90. A cargo tank is designed for vacuum loading and has a full-opening rear head. How frequently must this tank receive an external visual inspection under 49 CFR 180.407?
  91. For a standard (non-excepted) DOT cargo tank, which two intervals under 49 CFR 180.407 are NOT the same length?
  92. Under 49 CFR 180.407, what is the standard interval for an internal visual inspection of a DOT cargo tank?
  93. A cargo tank is insulated. Under 49 CFR 180.407, how often must it receive an internal visual inspection, compared to a non-insulated tank?
  94. A cargo tank is regularly used to transport lading that is corrosive to the tank itself. Under 49 CFR 180.407, what internal visual inspection interval applies?
  95. Under 49 CFR 180.407, how often must most DOT cargo tanks undergo a leakage test?
  96. An MC 331 cargo tank is used exclusively in chlorine service. Under 49 CFR 180.407, what leakage test interval applies to this tank?
  97. A cargo tank is used exclusively to haul a chemical that is corrosive to the tank, and the tank has no interior lining (bare metal). Under 49 CFR 180.407, how often must its shell and head thickness be measured at minimum?
  98. An unlined cargo tank hauling a corrosive product is measured during a periodic thickness test. The result comes in below the minimum prescribed thickness plus one-fifth of the tank's original corrosion allowance. Under 49 CFR 180.407(i)(1), what happens to that tank's testing schedule going forward?
  99. Why does 49 CFR 180.407 require periodic instrument-based thickness testing specifically for unlined cargo tanks carrying corrosive materials, instead of relying only on an exterior visual inspection?
  100. On a cargo tank's required test/inspection marking, which single letter code indicates that a pressure test was performed?
  101. A technician performs an internal visual inspection on the inside of a cargo tank. Which marking letter code should be applied to the tank to document that specific inspection?
  102. What is the difference between the 'K' and 'K-EPA27' marking codes used on a cargo tank?
  103. A cargo tank's test/inspection marking reads "10-99 P, V, L." What does this marking communicate?
  104. Under 49 CFR 180.415(b), what two pieces of information must appear together in every cargo tank test/inspection marking?
  105. A cargo tank undergoes both a pressure test and an external visual inspection on the same date. How should this be marked under 49 CFR 180.415(b)?
  106. Where must a cargo tank's test/inspection marking be physically located, per 49 CFR 180.415(b)(2)?
  107. What is the minimum required height for the letters and numbers used in a cargo tank's test/inspection marking?
  108. A tractor pulls a cargo tank combination with three separate cargo tanks, each built to a different specification and tested at different intervals. Under 49 CFR 180.415(c), how must their test/inspection markings be arranged?
  109. According to 49 CFR 383.119, which of the following is NOT one of the subject areas a tank vehicle endorsement applicant must know?
  110. 49 CFR 383.119(i) serves as a catch-all requirement for tank vehicle endorsement applicants. What does it require knowledge of?
  111. Which specific knowledge area does 49 CFR 383.119(c) require tank endorsement applicants to understand?
  112. Under 49 CFR 383.119(h), what must a tank endorsement applicant know specifically for drivers of DOT-specification tank vehicles?
  113. A dense liquid such as certain acids is being loaded into a cargo tank. According to the AAMVA CDL Manual, why might the tank need to be loaded only partially rather than completely full?
  114. What specific factor does 49 CFR 383.119(e) require tank endorsement applicants to know about regarding cargo surge?
  115. According to the AAMVA CDL Manual, what is the most important item to check for during a tank vehicle's pre-trip inspection?
  116. A driver discovers their cargo tank is leaking but decides to deliver the load anyway rather than taking it out of service. According to the AAMVA CDL Manual, what consequences does the manual say the driver may face?
  117. The AAMVA CDL Manual's introduction to Section 8 describes a specific purpose for inspecting a tank vehicle before loading, unloading, or driving it. What dual purpose does the manual give?
  118. What is the key difference between a bulkhead and a baffle in a liquid tank, as described in the AAMVA CDL Manual?
  119. Per the AAMVA CDL Manual's Section 8 self-check, what three factors determine how much liquid a driver should load into a tank?
  120. According to the AAMVA CDL Manual's safe driving rules for tank vehicles, which combination of techniques helps control dangerous liquid surge?
  121. The AAMVA Section 8 self-check asks: what two reasons make special care necessary when driving tank vehicles? Which answer matches the manual's explanation?
Other practice categories:
General Knowledge Air Brakes Combination Vehicles Hazmat (H) Endorsement Doubles/Triples (T) Endorsement Passenger (P) Endorsement School Bus (S) Endorsement