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Tennessee · DMV

Tennessee CDL Knowledge Test practice

To get a commercial driver's license in Tennessee, you pass the General Knowledge test plus the tests for your class and endorsements. General Knowledge has 50 questions and you need 40 correct (80%) to pass.

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General Knowledge at a glance

80%to pass
50
Questions
40
Correct to pass
18
Minimum age

Good to know

At 18 you can get a commercial learner's permit and drive within your state. You must be 21 to drive across state lines.

Source: law.cornell.edu. Rules change, so check before your test.

CDL knowledge tests

Everyone takes General Knowledge. Add the tests for your class and the endorsements you want.

TestQuestionsTo passPass mark
General Knowledge504080%
Air Brakes252080%
Combination Vehicles201680%
Hazardous Materials302480%
Tanker Vehicles201680%
Double/Triple Trailers201680%
Passenger Vehicles201680%
School Bus201680%
Pre-Trip Inspection201680%

What you'll study

The app's roadmap for this test: 217 short lessons and 1,808 practice questions, in 9 steps.

  1. 1

    General Knowledge

    Free82 lessons

    Core knowledge every commercial driver needs.

    • Pre-Trip Inspection
    • Brake Systems 1
    • Brake Systems 2
    • Brake Systems 3
    • Brake Systems 4
    • Brake Systems 5
    • Brake Systems 6
    • Brake Systems 7
    • +74 more
  2. 2

    Air Brakes

    24 lessons

    How air brake systems work and how to inspect them.

    • Air Compressor & Governor 1
    • Air Compressor & Governor 2
    • Air Storage Tanks 1
    • Air Storage Tanks 2
    • Valves & Gauges
    • Brake Chambers & Slack Adjusters 1
    • Brake Chambers & Slack Adjusters 2
    • Foundation Brakes 1
    • +16 more
  3. 3

    Combination Vehicles

    17 lessons

    Coupling, trailers and driving combination vehicles.

    • Rollover Prevention
    • Braking & Weight 1
    • Braking & Weight 2
    • Braking & Weight 3
    • Braking & Weight 4
    • Braking & Weight 5
    • Jackknife & Skid Control
    • Following Distance & Space
    • +9 more
  4. 4

    Hazardous Materials

    24 lessons

    Placards, loading and transporting hazardous materials.

    • The 9 Hazard Classes 1
    • The 9 Hazard Classes 2
    • The 9 Hazard Classes 3
    • The 9 Hazard Classes 4
    • The 9 Hazard Classes 5
    • Hazardous Materials Table 1
    • Hazardous Materials Table 2
    • Hazardous Materials Table 3
    • +16 more
  5. 5

    Tanker Vehicles

    13 lessons

    Liquid surge, stability and driving tankers.

    • Tank Inspection & Equipment
    • Loading & Unloading 1
    • Loading & Unloading 2
    • Loading & Unloading 3
    • Surge, Baffles & Rollover 1
    • Surge, Baffles & Rollover 2
    • Surge, Baffles & Rollover 3
    • Braking & Speed 1
    • +5 more
  6. 6

    Double/Triple Trailers

    12 lessons

    Pulling double and triple trailers safely.

    • Coupling & Uncoupling 1
    • Coupling & Uncoupling 2
    • Coupling & Uncoupling 3
    • Coupling & Uncoupling 4
    • Crack-the-Whip & Stability
    • Braking, Weight & Skids 1
    • Braking, Weight & Skids 2
    • Braking, Weight & Skids 3
    • +4 more
  7. 7

    Passenger Vehicles

    15 lessons

    Carrying passengers safely.

    • Pre-Trip & Inspection
    • Boarding & Exiting 1
    • Boarding & Exiting 2
    • Boarding & Exiting 3
    • Standee Rules & Capacity
    • Passenger Behavior & ADA 1
    • Passenger Behavior & ADA 2
    • Driving Techniques 1
    • +7 more
  8. 8

    School Bus

    16 lessons

    Student safety, loading zones and school bus rules.

    • Pre-Trip & Post-Trip Inspection
    • Pre-Trip & Mirrors
    • Danger Zones & Blind Spots
    • Loading Zone & Stop Procedures 1
    • Loading Zone & Stop Procedures 2
    • Loading Zone & Stop Procedures 3
    • Crossing & Escort Procedures
    • Traffic Laws & Right-of-Way
    • +8 more
  9. 9

    Pre-Trip Inspection

    14 lessons

    Inspecting your vehicle before every trip.

    • Engine Components & Steering 1
    • Engine Components & Steering 2
    • Fluid Levels & Leaks 1
    • Fluid Levels & Leaks 2
    • Gauges, Controls & Mirrors 1
    • Gauges, Controls & Mirrors 2
    • Lights, Body & Cargo 1
    • Lights, Body & Cargo 2
    • +6 more

Free practice tests by topic

Questions people ask

How many questions are on the Tennessee CDL Knowledge Test?

The General Knowledge test has 50 questions. Each class and endorsement adds its own test.

What score do you need to pass the Tennessee CDL Knowledge Test?

You need 40 out of 50 correct (80%).

How old do you have to be to take the Tennessee CDL Knowledge Test?

You can take it from age 18. At 18 you can get a commercial learner's permit and drive within your state. You must be 21 to drive across state lines.

What's the best way to practice for the Tennessee CDL Knowledge Test?

Study the official handbook, then practice with questions written for your test. Driving Exam Prep gives you short lessons, an explanation for every answer, a mistakes review and a readiness score against the real pass mark.

Official sources

Our questions are written from these official sources. Always study your official handbook too: rules change, and our practice questions may differ from your real test.

Other tests in Tennessee

Tennessee DMV Permit TestWritten knowledge test for a learner's permit or driver's license.Tennessee Motorcycle Permit TestWritten knowledge test for a motorcycle permit or license.

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