Knowledge Test Class A
This license is required for driving any legal combination of vehicles, with a gross combination weight rating of 26,001 pounds or more, provided the GVWR of a trailer exceeds 10,000 pounds To receive this license, applicants must pass a 50-question test. To pass, applicants must answer 40 questions correctly. Each question has four possible answer choices. Test questions come from the Washington D.C. Commercial Driver License Manual. Questions come from chapters covering: Introduction, Driving Safely, Transporting Cargo Safely, Air Brakes (if applicable), Combination, Doubles and Hazardous Materials. Endorsements that may be used with a Class A CDL are: Hazardous materials, Tank, Passenger, HazMat and Tank, Air Brakes and School bus.
Number of Question
Passing Score
1. Which of the following is not a sign of bad brake drums or shoes?
Explanation
Potential problems to check for when inspecting brakes include cracked drums; shoes or pads with oil, grease, or brake fluid on them; and shoes that are missing, broken, or worn dangerously thin.
2. What is a wig wag?
Explanation
A wig wag is a type of low air pressure warning device in an air brake system. It drops a mechanical arm into the driver's view when the air pressure in the tanks falls below 60 psi.
3. In bad weather, many drivers:
Explanation
In bad weather, particularly when visibility is poor, it is common for automobile drivers to follow closely behind trucks. Open up the distance between your vehicle and the vehicle in front of you if you are being followed too closely.
4. If you’re not sure how to handle a fire, you should:
Explanation
If you are unsure of which method is appropriate to use to extinguish a fire, you should wait for firefighters to arrive and let them handle it. This is especially important when dealing with hazardous materials fires.
5. What should happen if the air pressure in the braking system's air tanks falls below 60 psi?
Explanation
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.
6. On newer vehicles, how do you put on the parking brake?
Explanation
On newer vehicles with air brakes, the parking brake is controlled by a yellow, diamond-shaped knob. The knob is pulled out to set the brakes, and pushed in to release them.
7. Which of the following is not a sign of fatigue?
Explanation
Driving while fatigued is dangerous. Warning signs of fatigue include difficulty focusing; repeated yawning or rubbing of the eyes; daydreaming or wandering thoughts; and drifting out of your lane.
Frequently Asked Questions
A Class A Commercial Driver's License (CDL) is a type of driver's license required to operate vehicles that have a combined weight of 26,001 pounds or more, including the weight of the vehicle and any attached trailers. In District Of Columbia, a Class A CDL allows you to operate vehicles such as tractor-trailers, tanker trucks, and flatbed trucks.
To obtain a Class A CDL license in District Of Columbia, you must first obtain a commercial learner's permit (CLP) and pass a series of knowledge and skills tests. These tests cover topics such as vehicle inspection, basic control skills, and on-road driving. You must also meet certain medical and residency requirements.
Once you have obtained your CLP and passed the required tests, you can schedule a skills test at a District Of Columbia Department of Motor Vehicles (DMV) office. The skills test will measure your ability to safely operate a commercial vehicle in various driving situations.
Upon passing the skills test, you will be issued a Class A CDL license in District Of Columbia. Keep in mind that there are additional endorsements that may be required for certain types of commercial vehicle operations, such as hazardous materials or passenger transportation.
To obtain a Class A CDL license in District Of Columbia, you must first obtain a commercial learner's permit (CLP) and pass a series of knowledge and skills tests. These tests cover topics such as vehicle inspection, basic control skills, and on-road driving. You must also meet certain medical and residency requirements.
Once you have obtained your CLP and passed the required tests, you can schedule a skills test at a District Of Columbia Department of Motor Vehicles (DMV) office. The skills test will measure your ability to safely operate a commercial vehicle in various driving situations.
Upon passing the skills test, you will be issued a Class A CDL license in District Of Columbia. Keep in mind that there are additional endorsements that may be required for certain types of commercial vehicle operations, such as hazardous materials or passenger transportation.
With a Class A CDL license in the District of Columbia, you are authorized to operate combination vehicles with a total weight of 26,001 pounds or more, provided that the gross vehicle weight rating (GVWR) of the vehicle you are towing is greater than 10,000 pounds. Some examples of vehicles you can operate with a Class A CDL license include:
- Tractor-trailers
- Truck and trailer combinations
- Livestock carriers
- Tanker vehicles
- Flatbed trucks with trailers
- Double and triple trailers
It's important to note that there may be additional requirements or endorsements needed for certain types of commercial vehicle operations. For example, if you want to transport hazardous materials, you would need to obtain a hazardous materials endorsement in addition to your Class A CDL.
- Tractor-trailers
- Truck and trailer combinations
- Livestock carriers
- Tanker vehicles
- Flatbed trucks with trailers
- Double and triple trailers
It's important to note that there may be additional requirements or endorsements needed for certain types of commercial vehicle operations. For example, if you want to transport hazardous materials, you would need to obtain a hazardous materials endorsement in addition to your Class A CDL.
To obtain a Class A Commercial Driver's License (CDL) in District of Columbia, you must meet the following requirements:
1. Age: You must be at least 18 years old to obtain a CDL license in District of Columbia. However, if you plan to operate a commercial vehicle across state lines or transport hazardous materials, you must be at least 21 years old.
2. Valid driver's license: You must have a valid non-commercial driver's license.
3. Medical certification: You must pass a medical examination and obtain a valid medical certificate from a certified medical examiner.
4. Commercial learner's permit (CLP): You must obtain a CLP by passing the written knowledge test for the Class A CDL.
5. Knowledge tests: You must pass the written knowledge tests for the Class A CDL, which include general knowledge, combination vehicles, and air brakes.
6. Skills test: You must pass the skills test for the Class A CDL, which consists of three parts: pre-trip inspection, basic vehicle control skills, and on-road driving.
7. Residency: You must be a resident of District of Columbia or have proof of legal presence in the United States.
Note that additional endorsements may be required for certain types of commercial vehicle operations, such as hazardous materials or passenger transportation.
1. Age: You must be at least 18 years old to obtain a CDL license in District of Columbia. However, if you plan to operate a commercial vehicle across state lines or transport hazardous materials, you must be at least 21 years old.
2. Valid driver's license: You must have a valid non-commercial driver's license.
3. Medical certification: You must pass a medical examination and obtain a valid medical certificate from a certified medical examiner.
4. Commercial learner's permit (CLP): You must obtain a CLP by passing the written knowledge test for the Class A CDL.
5. Knowledge tests: You must pass the written knowledge tests for the Class A CDL, which include general knowledge, combination vehicles, and air brakes.
6. Skills test: You must pass the skills test for the Class A CDL, which consists of three parts: pre-trip inspection, basic vehicle control skills, and on-road driving.
7. Residency: You must be a resident of District of Columbia or have proof of legal presence in the United States.
Note that additional endorsements may be required for certain types of commercial vehicle operations, such as hazardous materials or passenger transportation.
In District of Columbia, the minimum age requirement for a Class A CDL license is 18 years old. However, there are some restrictions for drivers who are under the age of 21. If you are between the ages of 18 and 20, you may only operate commercial vehicles within the state of District of Columbia and may not transport hazardous materials or operate double or triple trailers.
If you are between the ages of 21 and 24, you may operate commercial vehicles across state lines but may not transport hazardous materials or operate double or triple trailers. If you are 21 years old or older, you may operate any type of commercial vehicle and transport any type of cargo, including hazardous materials and double or triple trailers.
If you are between the ages of 21 and 24, you may operate commercial vehicles across state lines but may not transport hazardous materials or operate double or triple trailers. If you are 21 years old or older, you may operate any type of commercial vehicle and transport any type of cargo, including hazardous materials and double or triple trailers.
Yes, you may need additional endorsements for certain types of commercial vehicle operations. Endorsements are added to your CDL license after you have passed additional knowledge and skills tests. Some of the most common endorsements for a Class A CDL license include:
1. T – Double/Triple Trailers: This endorsement allows you to haul double or triple trailers.
2. P – Passenger: This endorsement allows you to transport passengers in a commercial vehicle, such as a bus.
3. N – Tank Vehicles: This endorsement allows you to haul liquids or gases in a tank vehicle.
4. H – Hazardous Materials: This endorsement allows you to transport hazardous materials.
5. X – Combination of Tank Vehicle and Hazardous Materials: This endorsement combines the Tank Vehicle and Hazardous Materials endorsements.
Note that the requirements for obtaining endorsements vary depending on the type of endorsement and the state in which you are obtaining your CDL license. It is important to check with your local DMV or licensing agency for specific requirements.
1. T – Double/Triple Trailers: This endorsement allows you to haul double or triple trailers.
2. P – Passenger: This endorsement allows you to transport passengers in a commercial vehicle, such as a bus.
3. N – Tank Vehicles: This endorsement allows you to haul liquids or gases in a tank vehicle.
4. H – Hazardous Materials: This endorsement allows you to transport hazardous materials.
5. X – Combination of Tank Vehicle and Hazardous Materials: This endorsement combines the Tank Vehicle and Hazardous Materials endorsements.
Note that the requirements for obtaining endorsements vary depending on the type of endorsement and the state in which you are obtaining your CDL license. It is important to check with your local DMV or licensing agency for specific requirements.
The Class A CDL skills test includes three parts:
1. Pre-Trip Inspection: You will be tested on your ability to perform a pre-trip inspection of your vehicle to ensure it is safe to operate. You will need to identify and explain the items you are inspecting and why they are important.
2. Basic Vehicle Control: You will be tested on your ability to control your vehicle in a controlled environment, such as a closed course. This may include tasks such as backing up, turning, and parking.
3. On-Road Driving: You will be tested on your ability to safely operate your vehicle on public roads. This may include tasks such as merging onto highways, changing lanes, and navigating through intersections.
The skills test is typically administered by a state-certified examiner and is conducted using the same type of vehicle that you plan to drive with your CDL license. It is important to practice and prepare for the skills test before taking it to increase your chances of passing.
1. Pre-Trip Inspection: You will be tested on your ability to perform a pre-trip inspection of your vehicle to ensure it is safe to operate. You will need to identify and explain the items you are inspecting and why they are important.
2. Basic Vehicle Control: You will be tested on your ability to control your vehicle in a controlled environment, such as a closed course. This may include tasks such as backing up, turning, and parking.
3. On-Road Driving: You will be tested on your ability to safely operate your vehicle on public roads. This may include tasks such as merging onto highways, changing lanes, and navigating through intersections.
The skills test is typically administered by a state-certified examiner and is conducted using the same type of vehicle that you plan to drive with your CDL license. It is important to practice and prepare for the skills test before taking it to increase your chances of passing.
Yes, there are a few restrictions or limitations for drivers with a Class A CDL license. Here are some examples:
1. Age Restrictions: You must be at least 18 years old to obtain a Class A CDL license, but you can only drive within your state of residence and cannot haul hazardous materials. To drive across state lines or transport hazardous materials, you must be at least 21 years old.
2. Endorsements: As mentioned earlier, you may need additional endorsements for certain types of commercial vehicle operations.
3. Medical Certification: You must pass a medical examination and maintain a valid medical certificate to operate a commercial vehicle.
4. Weight Restrictions: The weight of the vehicle and cargo that you can legally operate may be limited based on your license and endorsements.
5. Hours of Service: You must comply with federal regulations on hours of service, which limit the number of hours you can drive in a day and week to prevent fatigue-related accidents.
It is important to know and follow these restrictions and limitations to avoid penalties or even losing your CDL license.
1. Age Restrictions: You must be at least 18 years old to obtain a Class A CDL license, but you can only drive within your state of residence and cannot haul hazardous materials. To drive across state lines or transport hazardous materials, you must be at least 21 years old.
2. Endorsements: As mentioned earlier, you may need additional endorsements for certain types of commercial vehicle operations.
3. Medical Certification: You must pass a medical examination and maintain a valid medical certificate to operate a commercial vehicle.
4. Weight Restrictions: The weight of the vehicle and cargo that you can legally operate may be limited based on your license and endorsements.
5. Hours of Service: You must comply with federal regulations on hours of service, which limit the number of hours you can drive in a day and week to prevent fatigue-related accidents.
It is important to know and follow these restrictions and limitations to avoid penalties or even losing your CDL license.
In District of Columbia, the Class A CDL written test is only available in English. The District of Columbia Department of Motor Vehicles (DMV) requires that all applicants for a commercial driver's license be able to read and understand English. This is because federal regulations require that all drivers be able to read and understand English well enough to understand road signs and communicate with law enforcement officers.
However, the DMV does provide an audio version of the written test for those who have difficulty reading or who require accommodations due to a disability. Additionally, if you need assistance understanding the questions on the test, you may bring an interpreter with you to translate for you. However, the interpreter cannot help you answer the questions or provide any other assistance during the test.
However, the DMV does provide an audio version of the written test for those who have difficulty reading or who require accommodations due to a disability. Additionally, if you need assistance understanding the questions on the test, you may bring an interpreter with you to translate for you. However, the interpreter cannot help you answer the questions or provide any other assistance during the test.
Yes, if you have a disability that makes it difficult for you to take the Class A CDL written test, you may request accommodations from the District of Columbia Department of Motor Vehicles (DMV). The DMV is committed to ensuring that all individuals have an equal opportunity to obtain a commercial driver's license, and they will work with you to provide reasonable accommodations.
To request accommodations, you will need to fill out a Request for Reasonable Accommodations form and submit it to the DMV. The form asks for information about your disability and the specific accommodations you are requesting. Some examples of accommodations that may be available include:
- Extra time to complete the test
- A separate testing room
- A reader or scribe
- An interpreter or assistive technology
Once the DMV receives your request, they will review it and determine whether your requested accommodations are reasonable and appropriate. They may also ask you to provide additional documentation or information about your disability. If your request is approved, the DMV will work with you to schedule a testing appointment that accommodates your needs.
To request accommodations, you will need to fill out a Request for Reasonable Accommodations form and submit it to the DMV. The form asks for information about your disability and the specific accommodations you are requesting. Some examples of accommodations that may be available include:
- Extra time to complete the test
- A separate testing room
- A reader or scribe
- An interpreter or assistive technology
Once the DMV receives your request, they will review it and determine whether your requested accommodations are reasonable and appropriate. They may also ask you to provide additional documentation or information about your disability. If your request is approved, the DMV will work with you to schedule a testing appointment that accommodates your needs.
If you fail the Class A CDL written test in District of Columbia, you can retake the test after waiting for a certain period of time. The waiting period depends on the number of times you have failed the test:
- First failure: You can retake the test immediately.
- Second failure: You must wait at least 7 days before retaking the test.
- Third and subsequent failures: You must wait at least 14 days before retaking the test.
Each time you retake the test, you will need to pay a fee. The fee for the Class A CDL written test in District of Columbia is $10. If you fail the test three times, you will be required to complete additional training before you can take the test again.
It's important to note that passing the written test is just one of the requirements for obtaining a Class A CDL in District of Columbia. You will also need to pass a skills test, which includes a pre-trip inspection, basic vehicle control, and an on-road driving test. Additionally, there are other requirements that must be met, such as age and medical requirements.
- First failure: You can retake the test immediately.
- Second failure: You must wait at least 7 days before retaking the test.
- Third and subsequent failures: You must wait at least 14 days before retaking the test.
Each time you retake the test, you will need to pay a fee. The fee for the Class A CDL written test in District of Columbia is $10. If you fail the test three times, you will be required to complete additional training before you can take the test again.
It's important to note that passing the written test is just one of the requirements for obtaining a Class A CDL in District of Columbia. You will also need to pass a skills test, which includes a pre-trip inspection, basic vehicle control, and an on-road driving test. Additionally, there are other requirements that must be met, such as age and medical requirements.
