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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. Brakes out of adjustment can cause the other brakes to:
work better.
overheat and fade.
last longer.
apply more braking power.
2. Which of the following is NOT a correct action in the event of brake failure?
Weaving from side to side to slow down.
Using the parking brake.
Putting the vehicle into a lower gear.
Looking for an escape route.
3. A high center of gravity means:
a rollover is less likely.
the spring brakes will come fully on.
you are more likely to tip over.
you'll have better traction.
4. Right after it starts to rain, the road is very slippery. Why?
Because rain is very slippery.
Because black ice may form on the road.
Because the water mixes with oil left on the road by vehicles.
None of the above.
5. When inspecting the cargo, make sure it is:
not overloaded.
piled up.
secured properly for the first 50 miles after beginning a trip.
All of the above.
6. If driving a new vehicle, you should familiarize yourself with the controlsĀ and equipment:
after pulling into a service station.
within the first 50 miles.
before you start driving.
as you drive.
7. Confused drivers may:
stop without warning.
change direction suddenly.
change lanes for no apparent reason.
All of the above.
8. To make the brakes work, air brakes use:
hydraulic air.
compressed air.
carbon monoxide.
9. When driving, you should check your mirrors:
every 10 seconds.
every 4 seconds.
only when there may be a problem.
10. Rough acceleration can cause:
mechanical damage.
tire damage.
damage electrical and brake lines.
All of the above.
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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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