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CDL General Knowledge Practice Test 2026：第6套练习测试

CDL General Knowledge Practice Test 练习测试第6套（共6套）：再练25道题，附答案和解释。

  • 商用车辆
  • 美国
  • 150道题
  • 核对于2026年10月10日

  1. 第1题，共25题

    What does a round, black-on-yellow warning sign mean?
    显示答案

    答案: D. A railroad crossing is ahead

    The round yellow advance sign warns that a railroad crossing is ahead: slow down, look and listen.

  2. 第2题，共25题

    Your low trailer gets stuck on a raised railroad crossing. What should you do first?
    显示答案

    答案: B. Get out and away from the tracks, then call 911

    Get out and move away from the tracks. Call 911 and give the crossing's location and DOT number if posted.

  3. 第3题，共25题

    To avoid a crash with an obstacle ahead, which is usually faster?
    显示答案

    答案: C. Steering around it

    You can almost always turn to miss an obstacle more quickly than you can stop.

  4. 第4题，共25题

    When you steer quickly to avoid a crash, what should you avoid?
    显示答案

    答案: D. Braking while you turn

    Do not brake while turning; it can lock the wheels and cause a skid.

  5. 第5题，共25题

    A driver coming toward you drifts into your lane. Which way should you move?
    显示答案

    答案: A. To your right

    When an oncoming driver drifts into your lane, a move to your right is best.

  6. 第6题，共25题

    What is controlled braking?
    显示答案

    答案: D. Braking hard without locking the wheels

    In controlled braking you brake hard but not so hard that the wheels lock. Keep steering moves small.

  7. 第7题，共25题

    How do you do stab braking?
    显示答案

    答案: D. Brake fully, release when wheels lock, reapply when they roll

    In stab braking, apply the brakes fully, release when the wheels lock, and reapply as soon as they roll again.

  8. 第8题，共25题

    What does an antilock braking system (ABS) do?
    显示答案

    答案: B. It stops wheel lockup so you can keep steering

    ABS keeps the wheels from locking so you can steer. It does not always shorten stopping distance.

  9. 第9题，共25题

    The ABS warning lamp stays on while you drive. What does this mean?
    显示答案

    答案: A. ABS may not work, but normal brakes still do

    If ABS fails you still have regular brakes. Drive normally and have the system checked soon.

  10. 第10题，共25题

    Who is responsible for the cargo you haul if someone else loaded it?
    显示答案

    答案: B. You, the driver

    The driver is responsible for inspecting cargo and knowing it is safe, even if someone else loaded it.

  11. 第11题，共25题

    When must you first check your cargo and its securement after starting a trip?
    显示答案

    答案: A. Within the first 50 miles

    Check the cargo and securing devices within the first 50 miles and adjust them as needed.

  12. 第12题，共25题

    After the first check, how often must you re-check cargo securement?
    显示答案

    答案: B. Every 3 hours or 150 miles, whichever comes first

    Re-check cargo when your duty status changes, after 3 hours or 150 miles, whichever comes first.

  13. 第13题，共25题

    What is the gross vehicle weight rating (GVWR)?
    显示答案

    答案: D. The maker's maximum weight for a vehicle and its load

    GVWR is the manufacturer's maximum for the vehicle plus its load.

  14. 第14题，共25题

    What is gross combination weight (GCW)?
    显示答案

    答案: D. The total weight of the power unit, trailers and cargo

    GCW is the total weight of the tractor or truck, its trailers, and the cargo.

  15. 第15题，共25题

    What does a bridge formula do?
    显示答案

    答案: C. Allows less weight on axles that are closer together

    Bridge formulas limit the weight on axles that are close together to protect bridges and roads.

  16. 第16题，共25题

    How should you load cargo to avoid a high center of gravity?
    显示答案

    答案: A. Low, with heavy items under light ones

    Keep the load low and put heavy items under lighter ones to lower the center of gravity.

  17. 第17题，共25题

    What can happen if there is too little weight on the drive axles?
    显示答案

    答案: B. Poor traction, so the drive wheels spin

    Too little weight on the drive axles gives poor traction, especially in bad weather.

  18. 第18题，共25题

    What is the minimum number of tiedowns for cargo on a flatbed?
    显示答案

    答案: A. One per 10 feet of cargo, and at least two

    Use at least one tiedown for each 10 feet of cargo. Any cargo, no matter how small, needs at least two.

  19. 第19题，共25题

    Under federal rules, how strong must a cargo securement system be?
    显示答案

    答案: D. Its working load limit must be at least half the cargo's weight

    The aggregate working load limit of the securement system must be at least one-half the weight of the cargo.

  20. 第20题，共25题

    What does a header board (headache rack) do?
    显示答案

    答案: C. Protects you from cargo sliding forward

    The front-end structure protects the driver from the load moving forward.

  21. 第21题，共25题

    You are hauling a sealed load you cannot inspect. What must you still check?
    显示答案

    答案: A. That gross and axle weight limits are not exceeded

    You cannot inspect sealed loads, but you must still make sure you are within weight limits.

  22. 第22题，共25题

    Why does hanging meat need special care?
    显示答案

    答案: A. It is unstable and has a high center of gravity

    Hanging meat can swing and shift, making the vehicle less stable, especially on ramps and curves.

  23. 第23题，共25题

    When hauling less than a full load of livestock, what helps keep the animals from shifting?
    显示答案

    答案: A. False bulkheads

    False bulkheads keep livestock bunched together so they do not shift the center of gravity.

  24. 第24题，共25题

    What do oversized loads usually need?
    显示答案

    答案: B. Special permits, and sometimes escort vehicles

    Over-length, over-width or overweight loads need special permits and are often limited to certain times.

  25. 第25题，共25题

    Your load needs hazmat placards. What do you need on your CDL?
    显示答案

    答案: C. A hazmat (H) endorsement

    Any driver who hauls hazardous materials that need placards must have a hazmat endorsement.

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