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Wisconsin CDL practice test

Getting a commercial driver's licence in Wisconsin starts with the CDL knowledge tests. The content is federal: every state, Wisconsin 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 Wisconsin driver licensing agency administers the test; the rules behind it are published by the FMCSA. Try the free Wisconsin CDL practice questions below, then pick a full test.

Free Wisconsin CDL practice questions

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

  1. Before coupling, the fifth wheel should be tilted:

    • Up toward the rear of the tractor
    • Level with the frame
    • Down toward the rear of the tractor
    • To one side to help the trailer line up
    Show answer
    Answer: C. Down toward the rear of the tractor

    With the fifth wheel tilted down at the rear, the kingpin slides into the throat of the fifth wheel as you back under. Also check that the jaws are open and the release arm is in the unlocked position.

    Source: FMCSA CDL Manual, Section 6.4.1 (Coupling: Inspect Fifth Wheel)

  2. Before you back the tractor under a trailer, you should make sure:

    • The trailer air supply knob is pushed in
    • The landing gear is fully raised
    • The trailer brakes are released so the trailer can move
    • The trailer wheels are chocked or the trailer spring brakes are on
    Show answer
    Answer: D. The trailer wheels are chocked or the trailer spring brakes are on

    A trailer that rolls as you back under it can be damaged or get away from you. Chock the wheels unless you are sure the spring brakes are holding it.

    Source: FMCSA CDL Manual, Section 6.4.1 (Coupling: Inspect Area and Chock Wheels)

  3. When positioning the tractor to couple, you should:

    • Put the tractor directly in front of the trailer and never back under it at an angle
    • Approach from the side so you can see the kingpin
    • Back under at a slight angle to help the jaws close
    • Line up by feel, since the mirrors do not help
    Show answer
    Answer: A. Put the tractor directly in front of the trailer and never back under it at an angle

    Backing under at an angle can push the trailer sideways and break the landing gear. Line up straight using both mirrors to see down each side of the trailer.

    Source: FMCSA CDL Manual, Section 6.4.1 (Coupling: Position Tractor)

  4. In the coupling procedure, when do you connect the air lines to the trailer?

    • Before moving the tractor at all
    • After the kingpin is locked and the landing gear is raised
    • After backing until the fifth wheel just touches the trailer and securing the tractor, but before backing fully under
    • Only after the tug test
    Show answer
    Answer: C. After backing until the fifth wheel just touches the trailer and securing the tractor, but before backing fully under

    Stop when the fifth wheel just touches the trailer, set the tractor parking brake, check trailer height, then connect the lines and charge the trailer air. The trailer brakes then hold while you finish backing under.

    Source: FMCSA CDL Manual, Section 6.4.1 (Coupling: Connect Air Lines to Trailer)

  5. After supplying air to the trailer and before backing the rest of the way under it, you should:

    • Push in the trailer air supply knob to release the trailer brakes
    • Raise the landing gear fully
    • Disconnect the service line
    • Pull out the trailer air supply knob to lock the trailer brakes
    Show answer
    Answer: D. Pull out the trailer air supply knob to lock the trailer brakes

    Locking the trailer brakes keeps the trailer from being pushed backward as the fifth wheel takes the kingpin. Then back under slowly in low gear until the jaws lock.

    Source: FMCSA CDL Manual, Section 6.4.1 (Coupling: Lock Trailer Brakes)

Every CDL test for Wisconsin drivers

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

How the Wisconsin 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 Wisconsin 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.

Wisconsin CDL test questions

How many questions are on the Wisconsin CDL test?

The Wisconsin 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 Wisconsin 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 Wisconsin?

At the Wisconsin 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 Wisconsin CDL practice questions?

Yes. Pick Wisconsin 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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