Knowledge Test Class B
This license is required for driving a single vehicle with a GVWR of more than 26,001 pounds, and a trailer not to exceed 10,000 pounds gross vehicle weight rating, or a vehicle designed to transport 24 or more people (including the driver). To receive this license, applicants must pass a 50-question test. To pass, applicants must answer 40 questions correctly. Each question has three or four possible answer choices. Test questions come from the Iowa Commercial Driver License Manual. Questions come from chapters covering: Introduction, Driving Safely, Transporting Cargo Safely, Air Brakes (if applicable), Pre-Trip Vehicle Inspection Test, Basic Vehicle Control Skills Test and On-Road Driving.. Endorsements that may be used with a Class B CDL are: Hazardous materials, Tank, Passenger, HazMat and Tank, Air Brakes and School bus.
Number of Question
Passing Score
22. You should ____ if the low pressure warning signal activates while you are driving.
Explanation
If the low pressure warning signal activates while you are driving, it is important that you safely exit the roadway as soon as possible and park your vehicle. If the air pressure gets too low, the brakes will no longer work well enough for you to stop safely.
23. Which of the following is not a good rule when using turn signals?
Explanation
When using your turn signals, you should signal well before the turn or lane change, signal continuously throughout the turn or lane change, and cancel the signal after you have completed your move.
24. When stopping, the brake pedal should be:
Explanation
When braking, push the pedal down gradually to ensure that the vehicle comes to a smooth, safe stop.
25. Before driving a vehicle with air brakes, you should ensure that the ____ come on automatically when air pressure falls below 45 psi.
Explanation
Before driving a vehicle with air brakes, you should ensure that the spring brakes come on automatically when air tank pressure falls to a level between 20 and 45 psi. You can do this by chocking the wheels and releasing air from the braking system by stepping on and off the brake pedal. Once the pressure levels drop to an unsafe level, the parking brake valve should pop out and spring brakes should come on.
26. What should you do if your vehicle gets stuck on railroad tracks?
Explanation
If your CMV gets stuck on railroad tracks, you should immediately leave the vehicle and get away from the tracks. Check the signposts or signal housing at the crossing for emergency contact information and call 911, or another appropriate emergency number.
27. When loading a trailer, it is important to:
Explanation
A load of cargo must be properly balanced. Placing too much weight over an axle can damage the axle and make it more difficult for you to steer. Placing too little weight over an axle can cause poor traction, also leading to difficult handling.
28. Do not operate a vehicle if any brake drums have cracks that are larger than ____ of the width of the friction area.
Explanation
Before beginning a trip, it is important to check the brake drums during your walk-around inspection. It is unsafe to drive if any brake drum has a crack more than one half of the width of the friction area.
Frequently Asked Questions
A Class B CDL (Commercial Driver's License) is a type of license that allows drivers to operate a single vehicle with a weight of 26,001 pounds or more. This includes vehicles such as tow trucks, delivery trucks, and buses.
To obtain a Class B CDL in Iowa, you must follow these steps:
1. Obtain a Commercial Driver's Manual from the Iowa Department of Transportation (DOT) or download it from their website.
2. Complete a DOT physical examination and obtain a medical certificate from a licensed healthcare provider.
3. Obtain a Commercial Learner's Permit (CLP) by passing a written knowledge test and a skills test in a vehicle of the same class that you wish to drive. You must also pass any additional endorsements required for your desired job, such as air brakes or passenger transport.
4. Practice driving with your CLP for at least 14 days before taking your skills test.
5. Schedule and pass your skills test, which includes a pre-trip inspection, basic vehicle control, and on-road driving.
6. Submit your application for a Class B CDL and pay the required fees to the Iowa DOT.
7. Once your application is approved, you will receive your Class B CDL in the mail within 7-10 days.
It's important to note that you must be at least 18 years old to obtain a Class B CDL in Iowa, but you must be at least 21 years old to drive across state lines or transport hazardous materials.
To obtain a Class B CDL in Iowa, you must follow these steps:
1. Obtain a Commercial Driver's Manual from the Iowa Department of Transportation (DOT) or download it from their website.
2. Complete a DOT physical examination and obtain a medical certificate from a licensed healthcare provider.
3. Obtain a Commercial Learner's Permit (CLP) by passing a written knowledge test and a skills test in a vehicle of the same class that you wish to drive. You must also pass any additional endorsements required for your desired job, such as air brakes or passenger transport.
4. Practice driving with your CLP for at least 14 days before taking your skills test.
5. Schedule and pass your skills test, which includes a pre-trip inspection, basic vehicle control, and on-road driving.
6. Submit your application for a Class B CDL and pay the required fees to the Iowa DOT.
7. Once your application is approved, you will receive your Class B CDL in the mail within 7-10 days.
It's important to note that you must be at least 18 years old to obtain a Class B CDL in Iowa, but you must be at least 21 years old to drive across state lines or transport hazardous materials.
With a Class B Commercial Driver's License (CDL) in Iowa, you are authorized to operate a single vehicle with a Gross Vehicle Weight Rating (GVWR) of 26,001 pounds or more. This includes the following types of vehicles:
1. Straight trucks: This includes box trucks, dump trucks, and any other single-unit vehicles that do not have a separate trailer.
2. Buses: You can operate any bus designed to transport 16 or more passengers (including the driver), but you may need additional endorsements depending on the type of bus and its cargo.
3. Large passenger vans: You can also operate large passenger vans with a GVWR of 26,001 pounds or more designed to transport 16 or more passengers (including the driver).
It's important to note that if you want to drive a vehicle with air brakes, you will need to obtain an Air Brake endorsement in addition to your Class B CDL. Additionally, if you want to transport hazardous materials, you will need to obtain a Hazardous Materials endorsement and meet additional requirements set by the Federal Motor Carrier Safety Administration (FMCSA).
1. Straight trucks: This includes box trucks, dump trucks, and any other single-unit vehicles that do not have a separate trailer.
2. Buses: You can operate any bus designed to transport 16 or more passengers (including the driver), but you may need additional endorsements depending on the type of bus and its cargo.
3. Large passenger vans: You can also operate large passenger vans with a GVWR of 26,001 pounds or more designed to transport 16 or more passengers (including the driver).
It's important to note that if you want to drive a vehicle with air brakes, you will need to obtain an Air Brake endorsement in addition to your Class B CDL. Additionally, if you want to transport hazardous materials, you will need to obtain a Hazardous Materials endorsement and meet additional requirements set by the Federal Motor Carrier Safety Administration (FMCSA).
To obtain a Class B Commercial Driver's License (CDL) in Iowa, you must meet the following requirements:
1. Age: You must be at least 18 years old to obtain a Class B CDL in Iowa, but you must be at least 21 years old to transport hazardous materials or drive across state lines.
2. Valid driver's license: You must hold a valid non-CDL driver's license in Iowa.
3. Medical certification: You must pass a medical examination and obtain a medical certificate from a licensed healthcare provider to demonstrate that you are physically qualified to operate a commercial motor vehicle.
4. Knowledge test: You must pass a written knowledge test covering the rules of the road and commercial driving regulations.
5. Skills test: You must pass a skills test that includes a pre-trip inspection, basic vehicle control, and on-road driving.
6. Background check: You will need to undergo a background check as part of the application process.
7. Proof of identity and residency: You will need to provide proof of your identity and residency in Iowa.
8. Fees: You will need to pay the required fees for your CDL application and any endorsements you may need.
It's important to note that if you have any disqualifying offenses on your driving record or criminal history, you may be ineligible for a CDL. Additionally, if you have any medical conditions that could affect your ability to operate a commercial vehicle safely, you may be disqualified or required to obtain additional medical certification.
1. Age: You must be at least 18 years old to obtain a Class B CDL in Iowa, but you must be at least 21 years old to transport hazardous materials or drive across state lines.
2. Valid driver's license: You must hold a valid non-CDL driver's license in Iowa.
3. Medical certification: You must pass a medical examination and obtain a medical certificate from a licensed healthcare provider to demonstrate that you are physically qualified to operate a commercial motor vehicle.
4. Knowledge test: You must pass a written knowledge test covering the rules of the road and commercial driving regulations.
5. Skills test: You must pass a skills test that includes a pre-trip inspection, basic vehicle control, and on-road driving.
6. Background check: You will need to undergo a background check as part of the application process.
7. Proof of identity and residency: You will need to provide proof of your identity and residency in Iowa.
8. Fees: You will need to pay the required fees for your CDL application and any endorsements you may need.
It's important to note that if you have any disqualifying offenses on your driving record or criminal history, you may be ineligible for a CDL. Additionally, if you have any medical conditions that could affect your ability to operate a commercial vehicle safely, you may be disqualified or required to obtain additional medical certification.
In Iowa, the minimum age requirement for a Class B Commercial Driver's License (CDL) is 18 years old. However, drivers who are between the ages of 18 and 20 will be restricted to driving within the state of Iowa only and cannot transport hazardous materials.
If you are between the ages of 21 and 24, you can obtain a Class B CDL and transport hazardous materials within the state of Iowa, but you cannot drive across state lines.
For drivers who are 25 years old or older, there are no age restrictions for obtaining a Class B CDL and transporting hazardous materials across state lines. However, it's important to note that individual employers may have their own age requirements for hiring commercial drivers.
If you are between the ages of 21 and 24, you can obtain a Class B CDL and transport hazardous materials within the state of Iowa, but you cannot drive across state lines.
For drivers who are 25 years old or older, there are no age restrictions for obtaining a Class B CDL and transporting hazardous materials across state lines. However, it's important to note that individual employers may have their own age requirements for hiring commercial drivers.
You may need additional endorsements on your Class B Commercial Driver's License (CDL) depending on the type of vehicle you plan to operate and the cargo you plan to transport. Here are some common endorsements for Class B CDL holders:
1. Passenger endorsement (P): Required for drivers of vehicles designed to transport 16 or more passengers, including the driver.
2. School bus endorsement (S): Required for drivers of school buses that are designed to transport 10 or more passengers, including the driver.
3. Tanker endorsement (N): Required for drivers of vehicles that transport liquids or gases in bulk containers with a capacity of 1,000 gallons or more.
4. Hazardous materials endorsement (H): Required for drivers who transport hazardous materials, as defined by federal regulations.
5. Combination endorsement (T): Required for drivers of combination vehicles with a total weight of 26,001 pounds or more.
It's important to note that each endorsement requires additional testing beyond the basic Class B CDL requirements, including written knowledge tests and skills tests. Additionally, some endorsements may require additional background checks and other requirements. You should check with your local Iowa Department of Transportation office to determine which endorsements you need for your specific situation.
1. Passenger endorsement (P): Required for drivers of vehicles designed to transport 16 or more passengers, including the driver.
2. School bus endorsement (S): Required for drivers of school buses that are designed to transport 10 or more passengers, including the driver.
3. Tanker endorsement (N): Required for drivers of vehicles that transport liquids or gases in bulk containers with a capacity of 1,000 gallons or more.
4. Hazardous materials endorsement (H): Required for drivers who transport hazardous materials, as defined by federal regulations.
5. Combination endorsement (T): Required for drivers of combination vehicles with a total weight of 26,001 pounds or more.
It's important to note that each endorsement requires additional testing beyond the basic Class B CDL requirements, including written knowledge tests and skills tests. Additionally, some endorsements may require additional background checks and other requirements. You should check with your local Iowa Department of Transportation office to determine which endorsements you need for your specific situation.
The Class B Commercial Driver's License (CDL) skills test is designed to evaluate your ability to operate a Class B vehicle safely and effectively. Here are the three parts of the skills test:
1. Pre-trip inspection: Before you begin driving, you'll need to demonstrate your knowledge of the vehicle and its safety features by conducting a pre-trip inspection. You'll need to identify and explain the function of various parts, check the vehicle's safety equipment, and ensure that any cargo is properly secured.
2. Basic vehicle control: In this part of the test, you'll demonstrate your ability to control the Class B vehicle in a controlled environment. You'll be asked to perform maneuvers such as straight line backing, offset backing, parallel parking, and alley docking.
3. On-road driving: The final part of the test evaluates your ability to safely operate a Class B vehicle in traffic. You'll need to demonstrate your ability to navigate intersections, maintain proper lane positioning, signal appropriately, and obey traffic laws.
It's important to note that all parts of the skills test are conducted with a state-certified examiner who will evaluate your performance and determine whether you pass or fail. Additionally, you'll need to provide your own Class B vehicle for the test, which must meet certain state requirements for safety and operation.
1. Pre-trip inspection: Before you begin driving, you'll need to demonstrate your knowledge of the vehicle and its safety features by conducting a pre-trip inspection. You'll need to identify and explain the function of various parts, check the vehicle's safety equipment, and ensure that any cargo is properly secured.
2. Basic vehicle control: In this part of the test, you'll demonstrate your ability to control the Class B vehicle in a controlled environment. You'll be asked to perform maneuvers such as straight line backing, offset backing, parallel parking, and alley docking.
3. On-road driving: The final part of the test evaluates your ability to safely operate a Class B vehicle in traffic. You'll need to demonstrate your ability to navigate intersections, maintain proper lane positioning, signal appropriately, and obey traffic laws.
It's important to note that all parts of the skills test are conducted with a state-certified examiner who will evaluate your performance and determine whether you pass or fail. Additionally, you'll need to provide your own Class B vehicle for the test, which must meet certain state requirements for safety and operation.
Yes, there are certain restrictions and limitations that apply to drivers with a Class B Commercial Driver's License (CDL). Here are some of the most common restrictions:
1. No passengers: If you do not have a passenger endorsement (P), you may not transport more than one passenger who is not a fellow employee.
2. No hazardous materials: If you do not have a hazardous materials endorsement (H), you may not transport hazardous materials, as defined by federal regulations.
3. No combination vehicles: If you do not have a combination endorsement (T), you may not operate combination vehicles with a total weight of 26,001 pounds or more.
4. Air brakes: If you do not pass the air brakes knowledge and skills tests, you will be restricted to driving vehicles without air brakes.
5. Automatic transmission: If you take the skills test in a vehicle with an automatic transmission, you will be restricted to driving vehicles with automatic transmissions only.
It's important to note that these restrictions and limitations may vary depending on your specific situation and the state in which you hold your CDL. Additionally, violating these restrictions can result in fines, penalties, suspension or revocation of your CDL, or other consequences.
1. No passengers: If you do not have a passenger endorsement (P), you may not transport more than one passenger who is not a fellow employee.
2. No hazardous materials: If you do not have a hazardous materials endorsement (H), you may not transport hazardous materials, as defined by federal regulations.
3. No combination vehicles: If you do not have a combination endorsement (T), you may not operate combination vehicles with a total weight of 26,001 pounds or more.
4. Air brakes: If you do not pass the air brakes knowledge and skills tests, you will be restricted to driving vehicles without air brakes.
5. Automatic transmission: If you take the skills test in a vehicle with an automatic transmission, you will be restricted to driving vehicles with automatic transmissions only.
It's important to note that these restrictions and limitations may vary depending on your specific situation and the state in which you hold your CDL. Additionally, violating these restrictions can result in fines, penalties, suspension or revocation of your CDL, or other consequences.
In Iowa, the Class B CDL written test is only available in English. However, if you are not proficient in English, you may be able to take the test with the assistance of a translator.
Iowa law allows for the use of an interpreter or translator to assist with the written test if you are not proficient in English. However, you will need to provide your own interpreter or translator, and they must be at least 18 years old and not have a vested interest in your passing the test.
Additionally, your interpreter or translator must sign an oath stating that they will accurately and impartially translate the test questions and your answers. The oath must be signed in the presence of a driver's license examiner or other authorized official.
It's important to note that even if you take the test with a translator, you will still need to demonstrate your ability to read and understand road signs and other important information in English.
Iowa law allows for the use of an interpreter or translator to assist with the written test if you are not proficient in English. However, you will need to provide your own interpreter or translator, and they must be at least 18 years old and not have a vested interest in your passing the test.
Additionally, your interpreter or translator must sign an oath stating that they will accurately and impartially translate the test questions and your answers. The oath must be signed in the presence of a driver's license examiner or other authorized official.
It's important to note that even if you take the test with a translator, you will still need to demonstrate your ability to read and understand road signs and other important information in English.
Yes, if you have a disability that impairs your ability to take the Class B CDL written test, you may be eligible for accommodations under the Americans with Disabilities Act (ADA).
To request accommodations, you should contact your local driver's license office and inform them of your disability and what accommodations you need. The Iowa Department of Transportation (DOT) will work with you to determine what accommodations are appropriate based on your specific needs and the requirements of the test.
Some examples of accommodations that may be available include extended time to complete the test, a separate testing room, a reader or scribe, or assistive technology such as a screen reader.
It's important to note that you will need to provide documentation of your disability and how it impacts your ability to take the test. This documentation should come from a qualified healthcare provider or other professional who can attest to your disability and what accommodations are needed.
Overall, the Iowa DOT is committed to ensuring that all individuals have equal access to driver's licensing services, including those with disabilities.
To request accommodations, you should contact your local driver's license office and inform them of your disability and what accommodations you need. The Iowa Department of Transportation (DOT) will work with you to determine what accommodations are appropriate based on your specific needs and the requirements of the test.
Some examples of accommodations that may be available include extended time to complete the test, a separate testing room, a reader or scribe, or assistive technology such as a screen reader.
It's important to note that you will need to provide documentation of your disability and how it impacts your ability to take the test. This documentation should come from a qualified healthcare provider or other professional who can attest to your disability and what accommodations are needed.
Overall, the Iowa DOT is committed to ensuring that all individuals have equal access to driver's licensing services, including those with disabilities.
Yes, if you fail the Class B CDL written test, you can retake it. However, there are some restrictions on how soon you can retake the test and how many times you can take it.
In Iowa, you must wait at least one day to retake the Class B CDL written test if you fail it. If you fail the test three times, you must wait at least 30 days before taking it again. After three failures, there is no limit on how many times you can retake the test, but a new fee is required each time.
It's important to note that passing the written test is just one step in obtaining a Class B CDL. You will also need to pass a skills test, which includes a pre-trip inspection and a road test, before you can obtain your license.
Overall, it's important to study and prepare thoroughly for the written test to increase your chances of passing on your first attempt. If you do fail, don't get discouraged – just use it as an opportunity to learn from your mistakes and try again when you are ready.
In Iowa, you must wait at least one day to retake the Class B CDL written test if you fail it. If you fail the test three times, you must wait at least 30 days before taking it again. After three failures, there is no limit on how many times you can retake the test, but a new fee is required each time.
It's important to note that passing the written test is just one step in obtaining a Class B CDL. You will also need to pass a skills test, which includes a pre-trip inspection and a road test, before you can obtain your license.
Overall, it's important to study and prepare thoroughly for the written test to increase your chances of passing on your first attempt. If you do fail, don't get discouraged – just use it as an opportunity to learn from your mistakes and try again when you are ready.
