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The CDL general knowledge test is required to be taken by all CDL applicants. The Vermont 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 Vermont 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 VT 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. The one-way check valve:
keeps your wheels from locking up when you brake hard.
keeps air from going out if the air compressor develops a leak.
supplies air to the trailer air tanks.
2. Air storage tanks:
hold compressed air for the brakes.
pump air into the air storage tanks.
use parts of the service brake systems to stop the vehicle in a brake system failure.
3. Use of drugs can lead to traffic accidents resulting in:
All of the above.
4. To warn drivers behind you when you see you'll need to slow down, you should:
sound your horn.
flash the brake lights.
use your headlights.
5. To test the parking brake:
turn off the engine.
step on and off the brake pedal to reduce air pressure.
gently try to pull forward with the parking brake on.
6. When only the tractor has ABS:
the trailer is less likely to swing out.
you should be able to maintain steering control during braking.
there is a greater chance of jackknifing.
7. The air storage tanks:
are used to hold compressed air.
are connected to the engine through gears or a v-belt.
stop the compressor from pumping air.
8. During a pre-trip inspection, to check your lights you should:
check the yellow malfunction lamps on the instrument panel.
with the engine running, put the vehicle in a forward gear and turn on the headlights.
turn off the engine, turn on the headlights and 4-way emergency flashers, and get out of the vehicle.
9. If another driver is following you too closely, you should:
immediately pull over to the side of the road.
decrease your following distance.
None of the above.
10. How many glasses of wine can you drink without increasing the chances of a crash?
It depends on your weight.
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CDL Knowledge Test VT

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