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The CDL general knowledge test is required to be taken by all CDL applicants. The Delaware 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 Delaware 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 DE 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. If you perform the skills test in a vehicle equipped with air over hydraulic brakes:
you will be required to operate vehicles with air brakes.
you will be restricted from operating vehicles with air brakes.
you will be required to take the tank vehicle test.
you will be required to operate a CMV without hydraulic brakes.
2. _____ is a thin layer of ice that forms on road surfaces.
Black ice
Blue ice
White ice
Grey ice
3. In vehicles with air brakes, the air compressor governor:
controls how much air the air compressor will pump into the air storage tanks.
controls when the air storage tanks will pump air into the air compressor.
controls when the air compressor will pump air into the air storage tanks.
None of the above.
4. When stopping at the scene of an accident, you should NOT:
put on your 4-way emergency flashers.
set out reflective triangles.
report any qualified person who is at the accident and helping the injured.
notify authorities.
5. If your tires are hot, you should NOT:
drive until you correct the cause of the overheating.
once the tires have cooled down, make another stop to check the tires.
stop to let the tires cool down.
let air out of the tires so the pressure goes back to normal.
6. Your safety equipment must include:
a dimmer switch.
spare electrical fuses (only if your vehicle is equipped with circuit breakers).
an inter-axle differential lock.
a properly charged and rated fire extinguisher.
7. The weight of a truck:
does not influence stopping distance.
is not as important as the vehicle's center of gravity in determining stopping distance.
has no impact on stopping distance.
None of the above.
8. When backing, it is important to use a helper whenever possible. Why?
To make sure you don't damage your truck.
Because you cannot see everything behind your vehicle.
All the above.
Because it's required by law.
9. An alcohol evaporator is important during:
windy weather.
hot weather.
dry weather.
cold weather.
10. If you let air out of hot tires:
as the tire cools, the air pressure will be too low.
air pressure will increases, causing the tires to blow out.
the tires will cool off much sooner.
None of the above.
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DE 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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