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District of Columbia CDL practice test

Getting a commercial driver's licence in District of Columbia starts with the CDL knowledge tests. The content is federal: every state, District of Columbia included, writes its tests from the FMCSA CDL manual, so the general knowledge test has 50 questions, the endorsement tests have 20 to 30, and the passing score is 80% on each. The District of Columbia driver licensing agency administers the test; the rules behind it are published by the FMCSA. Try the free District of Columbia CDL practice questions below, then pick a full test.

Free District of Columbia CDL practice questions

Five questions from the general knowledge, air brakes and combination vehicles banks, the three tests most District of Columbia Class A applicants take first. Show the answer to read the explanation.

  1. While driving, you notice the oil pressure gauge has dropped to a low reading. You should:

    • Stop as soon as you safely can and check the problem
    • Speed up so the oil pump works harder
    • Keep going until the next fuel stop
    • Turn off the gauge and watch the temperature instead
    Show answer
    Answer: A. Stop as soon as you safely can and check the problem

    Low oil pressure means the engine is not being lubricated and can be ruined in minutes. The manual tells you to watch your gauges during a trip and stop when they show trouble.

    Source: FMCSA CDL Manual, Section 2.1.6 (Inspection During a Trip)

  2. When starting a vehicle with a manual transmission, the gearshift should be in neutral and the clutch should be:

    • Released
    • Halfway engaged
    • Pushed to the floor
    • Held at the friction point
    Show answer
    Answer: C. Pushed to the floor

    Put the transmission in neutral and depress the clutch before turning the key. This keeps the vehicle from lurching and lets the starter turn the engine freely.

    Source: FMCSA CDL Manual, Section 2.2.1 (Accelerating and Starting)

  3. Whenever possible, which way should you back and turn a large vehicle?

    • Toward the passenger's side
    • In whichever direction is shorter
    • Straight back only, never with a turn
    • Toward the driver's side
    Show answer
    Answer: D. Toward the driver's side

    Backing toward the driver's side lets you see more of the vehicle's path out of your window and mirror. Backing toward the blind (passenger) side hides much of what is behind you.

    Source: FMCSA CDL Manual, Section 2.2.2 (Backing Safely)

  4. Before backing into a tight spot, you should:

    • Get out and walk around the vehicle to look at your path
    • Sound the horn three times and back quickly
    • Rely on the mirrors alone to save time
    • Back up fast so you spend less time in traffic
    Show answer
    Answer: A. Get out and walk around the vehicle to look at your path

    Walking the path shows you clearances, low branches, and objects your mirrors miss. Once you start, back slowly and use a helper when you can.

    Source: FMCSA CDL Manual, Section 2.2.2 (Backing Safely)

  5. While double clutching, you stay in neutral too long and cannot get the next gear. What should you do?

    • Force the shift lever into gear
    • Stop the vehicle and restart the engine
    • Return to neutral, release the clutch, bring engine speed up to match road speed, and try again
    • Shift two gears higher instead
    Show answer
    Answer: C. Return to neutral, release the clutch, bring engine speed up to match road speed, and try again

    If you miss the gear, do not force it. Go back to neutral, let the clutch out, rev the engine to match road speed, and repeat the shift.

    Source: FMCSA CDL Manual, Section 2.3.1 (Basic Method for Shifting Up)

Every CDL test for District of Columbia drivers

Each page has ten free sample questions, the real question count, the 80% pass mark and what the test covers.

How the District of Columbia CDL knowledge test works

You take the general knowledge test first; it is required for every CDL class. Class A drivers add the combination vehicles test. Almost everyone takes the air brakes test, because skipping it puts an air brake restriction on the licence. Endorsements (hazmat, tanker, doubles/triples, passenger, school bus) each have their own knowledge test. Pass the tests and you hold a commercial learner's permit; the skills test in a truck comes later.

Fees, appointment rules and test centre locations are set by District of Columbia and change over time, so check the state driver licensing agency before you go. What does not change is the content, and that is what PassRig drills.

District of Columbia CDL test questions

How many questions are on the District of Columbia CDL test?

The District of Columbia CDL general knowledge test follows the federal model: 50 questions, 40 correct to pass. Endorsement tests are shorter: air brakes 25, hazmat 30, and combination vehicles, tanker, doubles/triples, passenger and school bus 20 each.

What is the passing score on the District of Columbia CDL permit test?

80% on every knowledge test, the same pass mark used across the United States.

Where do I take the CDL knowledge test in District of Columbia?

At the District of Columbia state driver licensing agency (the DMV, DOT or equivalent). Check its website for locations, appointments and current fees; the test content itself comes from the FMCSA CDL manual.

Does PassRig have District of Columbia CDL practice questions?

Yes. Pick District of Columbia in the app and you get practice sets and mock exams built from the knowledge test content your state uses, with the real counts and the 80% line.

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