Knowledge Test Class A #2
Class A Driving Test | District Of Columbia 2026 #2 Page 7 of 7
Train for FREE online with our District Of Columbia class A license test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a DC CDL class A permit in 2026, practice as much as possible. Free sample tests published on our website will help you check and improve your knowledge and boost your grades. Please bear in mind that CDL class A requirements may vary from state to state.
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43 . Which of the following is not a crime that would disqualify an applicant from a hazardous materials endorsement?
Speeding
There are a number of crimes that will disqualify a person from receiving a hazardous materials endorsement for seven years. Among these are kidnapping or hostage taking, smuggling, and immigration violations. More serious crimes, such as murder, will result in a lifetime disqualification.
44 . Too little weight on a steering axle can result in:
Improved gas mileage.
The weight of cargo in a vehicle needs to be balanced appropriately so that it does not interfere with the vehicle's safe handling. For example, if cargo is placed too far to the rear of a vehicle, the front axle will be under-weighted and the front wheels may not have enough traction for the driver to steer safely.
45 . Bent lock rings:
Can lengthen tire life.
Mismatched, bent, or cracked lock rings are dangerous and should not be used.
46 . When approaching a railroad crossing, you should:
Look to see if nearby plants are moving from the breeze created by a passing train
As a precaution, you should always approach a railroad crossing under the assumption that a train is coming. Do not rely only on signals or your hearing to indicate that a train is approaching.
47 . If federal inspectors judge your vehicle to be unsafe, they can:
Pull the vehicle out-of-service until it is fixed.
If a federal or state inspector judges a CMV to be unsafe, they may put it out-of-service until it is fixed.
48 . What should happen if the air pressure in the braking system's air tanks falls below 60 psi?
The steering wheel will lock up.
On vehicles with air brakes, a low air pressure warning signal will come on if the pressure in the air tanks falls below 60 psi. On large buses, the signal may activate at 80 to 85 psi.
49 . During a static leakage test, the maximum leakage rate for a single vehicle with air brakes is ____ in one minute.
4 psi
When performing a static leakage test on a single vehicle with air brakes, the leakage rate should be no more than 2 psi in a minute. If air leaks from the air brake system at a quicker rate, the vehicle should not be driven because something likely needs to be repaired.
50 . A one-way check valve:
Holds the spring brakes in position until they are used.
A one-way check valve is required to be between an air compressor and the first main reservoir. This valve prevents air from escaping the system if the air compressor develops a leak.
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2026 District Of Columbia | Frequently Asked Questions
To secure a CDL Bus endorsement in the District of Columbia, you must first have a valid Commercial Driver's License (CDL). Then, you'll need to pass the Passenger Vehicles endorsement test. This includes a written knowledge test and a skills test in a vehicle similar to the one you'll be driving. You may also need to complete additional training.
To obtain a CDL Bus license in the District of Columbia, you must first have a valid driver's license. You'll then need to pass a general knowledge test, a passenger transport test, and a skills test which includes pre-trip vehicle inspection, basic vehicle control, and on-road driving. You must also provide medical certification and pass a background check.
Yes, specific training is necessary for a CDL Bus endorsement in the District of Columbia. This training typically covers topics like safe driving practices, emergency procedures, passenger management, and specific skills related to driving a bus. Additionally, you'll need to pass both a written test and a skills test demonstrating your knowledge and abilities.
CDL Bus licenses fall under Class A, B, or C depending on the vehicle's size and capacity. Class A is for combination vehicles over 26,001 pounds, Class B is for single vehicles over 26,001 pounds, and Class C is for vehicles designed to transport 16 or more passengers. Each class requires a different skills test.
No, you cannot use your personal vehicle for the CDL Bus driving test in the District of Columbia. The vehicle you use must match the class of CDL you are applying for. Therefore, you need to use a commercial bus for your test if you're seeking a bus endorsement. This ensures that you can handle the specific type of vehicle safely.
During the CDL Bus driving test in the District of Columbia, your ability to safely operate the vehicle is evaluated. This includes skills like pre-trip vehicle inspection, backing up, parallel parking, docking in an alley, making right and left turns, merging into traffic, maintaining appropriate speeds, and following safety procedures for loading and unloading passengers.
Yes, additional medical prerequisites are essential for a CDL Bus endorsement in the District of Columbia. Applicants must pass a Department of Transportation (DOT) physical examination by a certified medical examiner. This exam ensures you're physically capable of operating a commercial vehicle safely, checking aspects like vision, hearing, and overall physical health.
No, it's not permissible to transport passengers without a valid CDL Bus endorsement in the District of Columbia. The law requires anyone driving a commercial vehicle designed to carry 16 or more passengers, including the driver, to have a commercial driver's license with a passenger (P) endorsement. Driving without the correct endorsement could result in fines and penalties.
Yes, a CDL Bus endorsement can be added to your existing CDL in the District of Columbia. This requires passing a knowledge test and a skills test in a vehicle representative of the class of bus you wish to drive. Once you pass these tests, the endorsement can be added to your current license without needing a new one.
Yes, there are restrictions for drivers with a CDL Bus endorsement in the District of Columbia. These may include limitations related to the number of passengers, vehicle size, and cargo type. Additionally, bus drivers must comply with hours-of-service regulations, maintain a clean driving record, and pass regular drug and alcohol screenings. Violations can lead to endorsement suspension or revocation.
