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CDL General Knowledge Practice Test 2026：第2套练习测试

CDL General Knowledge Practice Test 练习测试第2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

    For a first Class A or Class B CDL, when must entry-level driver training be finished?
    显示答案

    答案: B. Before you take the CDL skills test

    ELDT must be completed before the skills test for a first Class A or Class B CDL.

  2. 第2题，共25题

    A Class B CDL holder wants to upgrade to Class A. Is entry-level driver training needed?
    显示答案

    答案: A. Yes

    Upgrading from Class B to Class A is one of the cases that requires ELDT.

  3. 第3题，共25题

    Under federal rules, how old must you be to drive a commercial motor vehicle in interstate commerce?
    显示答案

    答案: B. 21

    A driver must be at least 21 years old to drive a CMV in interstate commerce.

  4. 第4题，共25题

    Who may do your DOT medical exam?
    显示答案

    答案: A. A medical examiner on FMCSA's National Registry

    The physical exam must be done by a medical examiner on the National Registry of Certified Medical Examiners.

  5. 第5题，共25题

    How often must most CDL drivers pass a DOT medical exam?
    显示答案

    答案: D. At least every 24 months

    Most drivers must be re-examined if they have not been certified in the last 24 months. Some conditions need a new exam every 12 months.

  6. 第6题，共25题

    What distant vision does a CMV driver need in each eye, with or without glasses?
    显示答案

    答案: C. At least 20/40

    The vision standard is at least 20/40 in each eye, with or without corrective lenses.

  7. 第7题，共25题

    What field of vision must a CMV driver have in each eye?
    显示答案

    答案: A. At least 70 degrees side to side

    Drivers need a field of vision of at least 70 degrees in the horizontal meridian in each eye.

  8. 第8题，共25题

    How well must a commercial driver read and speak English?
    显示答案

    答案: B. Well enough to talk with the public, read signs and fill out reports

    Federal rules require enough English to converse with the public, understand traffic signs, respond to official questions and make report entries.

  9. 第9题，共25题

    You are convicted of a traffic violation (not parking) in any vehicle. How soon must you tell your employer?
    显示答案

    答案: D. Within 30 days

    Commercial drivers must notify their employer within 30 days of a traffic conviction, other than parking, in any type of vehicle.

  10. 第10题，共25题

    When you apply for a commercial driving job, how many years of past employment must you list?
    显示答案

    答案: D. 10 years

    You must give your employer information about all driving jobs you held in the past 10 years.

  11. 第11题，共25题

    How many driver's licenses may a commercial driver hold?
    显示答案

    答案: D. Only one

    You may hold only one license. Having more than one can bring a fine or jail.

  12. 第12题，共25题

    What alcohol concentration is the legal limit for driving a commercial motor vehicle?
    显示答案

    答案: D. 0.04%

    Driving a CMV with an alcohol concentration of 0.04% or more is a disqualifying offense.

  13. 第13题，共25题

    How long before going on duty or driving a CMV must you stop using alcohol?
    显示答案

    答案: C. At least 4 hours

    You may not use alcohol within 4 hours before going on duty or driving a CMV.

  14. 第14题，共25题

    You are found with any detectable alcohol while on duty, but under 0.04%. What happens?
    显示答案

    答案: D. You are put out of service for 24 hours

    A driver with any measured alcohol or detected presence of alcohol is placed out of service for 24 hours.

  15. 第15题，共25题

    A driver is convicted for the first time of driving a CMV under the influence. The load was not hazmat. What is the disqualification?
    显示答案

    答案: D. At least 1 year

    A first conviction for a major offense such as DUI brings a disqualification of 1 year when no hazmat is involved.

  16. 第16题，共25题

    What is the disqualification for a first DUI conviction while hauling placarded hazardous materials?
    显示答案

    答案: A. At least 3 years

    First convictions for major offenses while transporting hazardous materials carry a 3-year disqualification.

  17. 第17题，共25题

    What is the usual penalty for a second conviction of a major offense, such as DUI, in a CMV?
    显示答案

    答案: B. Disqualification for life

    A second conviction for a major offense generally brings a lifetime disqualification.

  18. 第18题，共25题

    While driving a CMV, you refuse a police officer's request to take an alcohol test. How is this treated?
    显示答案

    答案: A. As a major offense, like DUI

    Refusing an alcohol test is a major offense, with the same 1-year first-time disqualification as DUI.

  19. 第19题，共25题

    You are convicted of two serious traffic violations in a CMV within 3 years. How long is the disqualification?
    显示答案

    答案: C. At least 60 days

    A second serious traffic violation within 3 years brings a 60-day disqualification.

  20. 第20题，共25题

    What happens after a third serious traffic violation in a CMV within 3 years?
    显示答案

    答案: A. At least a 120-day disqualification

    Three or more serious traffic violations within 3 years bring a 120-day disqualification.

  21. 第21题，共25题

    Which of these is a serious traffic violation for a CDL holder?
    显示答案

    答案: D. Speeding 15 mph or more over the limit

    Excessive speeding of 15 mph or more over the limit is listed as a serious traffic violation.

  22. 第22题，共25题

    How are texting and using a hand-held phone while driving a CMV treated?
    显示答案

    答案: D. As serious traffic violations that can lead to disqualification

    Texting and using a hand-held mobile phone while driving a CMV are both serious traffic violations.

  23. 第23题，共25题

    When may you use a hand-held phone while driving a CMV?
    显示答案

    答案: C. Only to call police or emergency services

    Federal rules ban hand-held phone use while driving a CMV, except to contact law enforcement or emergency services.

  24. 第24题，共25题

    You are convicted of a railroad crossing violation in a CMV for the first time. What is the disqualification?
    显示答案

    答案: A. At least 60 days

    A first railroad-highway grade crossing violation brings a disqualification of no less than 60 days.

  25. 第25题，共25题

    What is the disqualification for a first conviction of driving while under an out-of-service order (no hazmat or passengers)?
    显示答案

    答案: C. 180 days to 1 year

    A first out-of-service order violation brings a disqualification of no less than 180 days and no more than 1 year.

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