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Driving Tank Vehicles — CDL Tank Vehicles Practice Test

Driving Tank VehiclesQuestion 1 of 23

23 questions in this topic · 23 drawn at random this round

What does a high center of gravity mean for a tank vehicle?

CDL Manual — Tank Vehicles (§8)

Questions are based on Section 8 (Tank Vehicles) of the official CDL manual (AAMVA model). The Tank Vehicles (N) endorsement is a knowledge test only and is given in ENGLISH (real test); our Chinese & Spanish are study aids to help you learn the English material. The N endorsement is required to haul a liquid or gas in a permanent/temporary tank over 119 gallons (or a portable tank of 1,000 gal+). Federal rules (FMCSA, 49 CFR 391.11) require English proficiency to drive commercially.

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This CDL Tank Vehicles Driving Tank Vehicles practice set has 23 practice questions based on the official exam materials, each with an instant explanation. You need 80% on the real CDL Tank Vehicles knowledge test to pass.

Sample questions

Three questions from the Driving Tank Vehicles bank with the correct answer and an explanation. The practice quiz above draws 23 questions at random from the same bank.

  1. Why does hauling liquids in tanks require special driving skills?

    • Because of the high center of gravity and the movement of the liquid — Correct answer
    • Because tank engines are much more powerful than other trucks
    • Because tanks have no brakes of their own
    • Because liquid loads never need to be secured

    Explanation: Hauling liquids in tanks requires special skills because of the high center of gravity and the movement of the liquid. English term: center of gravity (重心 / centro de gravedad).

    Handbook: Tank Vehicles — Driving Tank Vehicles

  2. What does a high center of gravity mean for a tank vehicle?

    • Much of the weight is carried high up, making the vehicle top-heavy and easy to roll over — Correct answer
    • The weight is carried low, making the vehicle very stable
    • The engine is mounted above the cab
    • The tank can carry more weight than a flatbed

    Explanation: A high center of gravity means much of the load's weight is carried high up off the road. This makes the vehicle top-heavy and easy to roll over. English term: center of gravity (重心 / centro de gravedad).

    Handbook: Tank Vehicles — High Center of Gravity

  3. What have tests shown about liquid tankers and posted speed limits for curves?

    • Tankers can turn over even at the speed limits posted for curves — Correct answer
    • Tankers are safe at any speed up to the posted limit
    • Posted curve speeds are set specifically for tankers
    • Tankers roll over only when fully loaded

    Explanation: Liquid tankers are especially easy to roll over. Tests have shown that tankers can turn over at the speed limits posted for curves. English term: rollover (侧翻 / vuelco).

    Handbook: Tank Vehicles — High Center of Gravity