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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. After a tire has been changed, you should:
stop a short while later and check that the nuts are tight.
deflate the tire to 15 psi.
decrease tire pressure.
wait at least 30 minutes before driving.
2. When driving in very hot weather, you may have to:
increase your speed until the tires cool off.
decrease your following distance.
watch out for black ice.
reduce your speed to prevent overheating.
3. When backing, it is best to:
use a helper whenever possible.
use only the passenger's side mirror.
try to back in the direction of the drift.
back toward the passenger's side when possible.
4. When driving a 50-foot truck at 40 mph, your minimum following distance should be:
5 seconds
6 seconds
4 seconds
8 seconds
5. While on the road, drivers must stop to check their cargo:
after each break.
every 150 miles or every three hours.
within the first 50 miles of a trip.
All of the above.
6. If driving a vehicle equipped with power steering, you should check:
check pumps.
fluid level.
All of the above.
7. If a car suddenly cuts in front of you, creating a hazard, you should NOT:
signal and change lanes to avoid the car, if possible.
slow down to prevent a crash.
stay close behind the car and honk your horn.
All of the above.
8. During a pre-trip inspection, to check your lights you should:
check the yellow malfunction lamps on the instrument panel.
turn off the engine, turn on the headlights and 4-way emergency flashers, and get out of the vehicle.
with the engine running, put the vehicle in a forward gear and turn on the headlights.
with the engine running, turn on the headlights and 4-way emergency flashers, and get out of the vehicle.
9. When the load on a vehicle extends more than 4 feet beyond the rear of the body, a _______ must be placed at the end of the load.
warning sign
red flag
blue flag
yellow sign
10. When signaling what you intend to do, you should:
signal early.
signal continuously.
cancel your signal after you have turned.
All of the above.
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DC CDL Practice Test

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