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The CDL general knowledge test is required to be taken by all CDL applicants. The District of Columbia CDL test consists of 50 questions. To pass, you must correctly answer at least 40 questions (80%). The general knowledge test covers the contents of the District of Columbia CDL Manual. All CDL applicants (Class A, B and C) must study the following sections: Driving Safely, Transporting Cargo Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Vehicle Inspection Test, Basic Control Skills Test, Road Test. In addition, the Class A CDL test will include questions based on the Combination Vehicles section. Take this CDL practice test now to prepare for the actual DC general knowledge test! To get your CDL, you must pass both the knowledge and skills tests. CDL knowledge tests include: General Knowledge, Passenger Transport, Air Brakes, Combination Vehicles, Hazardous Materials, Tanker Vehicles, Doubles/Triples, School Bus, Firefighter. Depending on what class of license (A, B or C) and endorsements you need, you must take one or more knowledge tests. A special endorsement is also required to drive certain types of vehicles. The following endorsements may be used with a Class A, B or C CDL: HazMat (H), Tank Vehicles (N), Tank Vehicles Transporting Hazardous Materials (X) and Passenger Transport (P). The School Bus endorsement (S) is only available for Class A or B CDL, and the Doubles/Triples endorsement (T) is only available for Class A driver's licenses.
1. When driving on slippery surfaces, a lack of spray from other vehicles indicates that:
the pavement is dry.
the road hasn't started to ice up yet.
ice has formed on the road.
there is no ice on the road surface.
2. Using a helper when backing up is:
not recommended.
3. The parking brake should be tested while the vehicle is:
moving back slowly.
moving forward slowly.
moving at highway speeds.
None of the above.
4. When backing your vehicle, it's not recommended to:
back as slow as possible.
back and turn towards the driver's side.
use the lowest reverse gear.
back towards the right side.
5. Tar in the road pavement:
frequently rises to the surface in very hot weather.
increases the ability to maintain traction on a vehicle.
does not affect the road surface.
can slow down your vehicle.
6. Name 2 causes of tire fires.
Driver smoking and bleeding tar.
Over-inflated tires and duals that touch.
Loose connections and poor ventilation.
Under-inflated tires and duals that touch.
7. Placards are:
a type of safety equipment.
signs put inside a vehicle used to warn others of hazardous materials.
devices placed below a vehicle to improve traction.
signs placed on a vehicle to identify the hazard class of the cargo.
8. Which of the following statements about backing heavy vehicles is true?
The helper should stand where you cannot see the helper.
Back to the right side so that you can see better.
Always back as quickly as possible.
You should avoid backing whenever you can.
9. Your safety equipment must include:
an inter-axle differential lock.
a properly charged and rated fire extinguisher.
spare electrical fuses (only if your vehicle is equipped with circuit breakers).
a dimmer switch.
10. Weaving across the road or drifting from one side to another is typical of:
slow drivers.
confused drivers.
impaired drivers.
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DC CDL Practice Test

Number of questions: 50
Correct answers to pass:40
Passing score:80%
Number of questions: 50
Correct answers to pass:40
Passing score:80%
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