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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. Which of the following statements is true?
The weight of a cargo van does not change its height.
The weight of a cargo van changes its height.
An empty van is lower than a loaded one.
The heights posted at bridges and overpasses are always correct.
2. When driving on long and/or steep downgrades, to select an appropriate safe speed you should consider:
the total weight of the vehicle and cargo.
the road conditions.
the length of the grade.
All of the above.
3. Do NOT use water on a _______ fire.
4. If your cargo only fills one-third of the length of your trailer, make sure your cargo is:
to one side and as close to the ground as possible.
piled up high with heavy cargo on top.
centered and spread out as much as possible.
loaded so there is a high center of gravity.
5. When is use of a drug given to a driver by a doctor permitted?
Only if the doctor informs the driver that the drug won't affect safe driving ability.
Only if it's a prescription drug.
Only if it's an over the counter drug.
6. Which of the following is NOT correct? Anti-lock brakes:
help drivers avoid skids caused by over braking.
help drivers avoid wheel lock up.
require drivers to apply the brakes as hard as they can without locking the wheels.
give drivers more control over the vehicle during braking.
7. If you feel drowsy while driving, you should:
pull off the road and get some rest.
fall asleep.
get some coffee.
stop yawning.
8. Why should you check your mirrors regularly to know where other vehicles are around you?
To flash the brake lights if you are being tailgated.
To know whether you can make a quick lane change in an emergency.
To move out of their way if they want to get past.
To better assess your own speed.
9. If you are being tailgated, you should:
open up room in front of you.
turn on your taillights.
increase your speed very gradually.
make quick changes.
10. Controlled braking:
can be used to keep your vehicle in a straight line and allow you to turn if necessary.
involves pumping the brakes while keeping steering wheel movements very small.
must be used when you need to turn sharply while braking.
involves locking the wheels and then releasing the brakes.
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Number of questions: 50
Correct answers to pass:40
Passing score:80%
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