CDL Class A Commercial Driver Licensing Exam
Questions With Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
Download Pdf
1. What is the minimum age to obtain a CDL Class A license to drive
across state lines (interstate commerce)?
A. 16
B. 18
C. 21
D. 25
Rationale: Federal law requires drivers to be at least 21 years old to
operate a commercial vehicle across state lines. Drivers aged 18–20
may drive intrastate but cannot cross state borders.
2. Which of the following best describes the “hours-of-service”
regulations for a CDL driver?
A. Maximum driving time per day only
B. Limits on driving hours, on-duty hours, and required rest
, periods
C. Vehicle inspection requirements
D. Passenger safety regulations
Rationale: Hours-of-service regulations govern how many hours a
driver can operate a commercial vehicle and require rest periods to
prevent fatigue-related accidents.
3. What is the purpose of a pre-trip inspection?
A. To practice parking
B. To ensure the vehicle is safe to operate
C. To measure fuel efficiency
D. To determine route planning
Rationale: Pre-trip inspections are critical to identify mechanical
issues, cargo security, and safety equipment before operating a
commercial vehicle.
4. When backing a combination vehicle, the safest method is to:
A. Look only at your mirrors
B. Use a helper or spotter when available and turn your body to
look backward
, C. Rely on a backup camera only
D. Speed up to minimize backing time
Rationale: Backing a large vehicle is challenging; using a spotter and
turning to visually monitor the path reduces the risk of collisions.
5. If your vehicle hydroplanes, the correct action is to:
A. Brake hard immediately
B. Ease off the accelerator and steer straight
C. Turn sharply to regain traction
D. Accelerate to regain control
Rationale: Hydroplaning occurs when tires lose contact with the road.
Braking or turning sharply can worsen loss of control; easing off the
accelerator and maintaining direction allows tires to regain traction.
6. How should you secure a load containing liquids?
A. Tie it loosely with ropes
B. Use only a tarp
C. Ensure bulkheads, baffles, or secure containment to prevent
shifting
D. Nothing is required
, Rationale: Liquid loads can shift and affect vehicle stability. Proper
containment and baffles prevent sudden load movement, maintaining
vehicle control.
7. What does a “steering axle” refer to on a commercial vehicle?
A. Rear axle that supports cargo
B. Front axle that controls vehicle direction
C. Axle used for braking only
D. Trailer axle
Rationale: The steering axle is located at the front and is responsible
for directional control. Weight and tire condition are critical for safe
steering.
8. The proper way to check brakes during a pre-trip inspection is to:
A. Pump the brake pedal and listen
B. Inspect air brake system components, check slack adjusters,
and test brake response
C. Ignore them if the vehicle is new
D. Only test while driving
Questions With Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
Download Pdf
1. What is the minimum age to obtain a CDL Class A license to drive
across state lines (interstate commerce)?
A. 16
B. 18
C. 21
D. 25
Rationale: Federal law requires drivers to be at least 21 years old to
operate a commercial vehicle across state lines. Drivers aged 18–20
may drive intrastate but cannot cross state borders.
2. Which of the following best describes the “hours-of-service”
regulations for a CDL driver?
A. Maximum driving time per day only
B. Limits on driving hours, on-duty hours, and required rest
, periods
C. Vehicle inspection requirements
D. Passenger safety regulations
Rationale: Hours-of-service regulations govern how many hours a
driver can operate a commercial vehicle and require rest periods to
prevent fatigue-related accidents.
3. What is the purpose of a pre-trip inspection?
A. To practice parking
B. To ensure the vehicle is safe to operate
C. To measure fuel efficiency
D. To determine route planning
Rationale: Pre-trip inspections are critical to identify mechanical
issues, cargo security, and safety equipment before operating a
commercial vehicle.
4. When backing a combination vehicle, the safest method is to:
A. Look only at your mirrors
B. Use a helper or spotter when available and turn your body to
look backward
, C. Rely on a backup camera only
D. Speed up to minimize backing time
Rationale: Backing a large vehicle is challenging; using a spotter and
turning to visually monitor the path reduces the risk of collisions.
5. If your vehicle hydroplanes, the correct action is to:
A. Brake hard immediately
B. Ease off the accelerator and steer straight
C. Turn sharply to regain traction
D. Accelerate to regain control
Rationale: Hydroplaning occurs when tires lose contact with the road.
Braking or turning sharply can worsen loss of control; easing off the
accelerator and maintaining direction allows tires to regain traction.
6. How should you secure a load containing liquids?
A. Tie it loosely with ropes
B. Use only a tarp
C. Ensure bulkheads, baffles, or secure containment to prevent
shifting
D. Nothing is required
, Rationale: Liquid loads can shift and affect vehicle stability. Proper
containment and baffles prevent sudden load movement, maintaining
vehicle control.
7. What does a “steering axle” refer to on a commercial vehicle?
A. Rear axle that supports cargo
B. Front axle that controls vehicle direction
C. Axle used for braking only
D. Trailer axle
Rationale: The steering axle is located at the front and is responsible
for directional control. Weight and tire condition are critical for safe
steering.
8. The proper way to check brakes during a pre-trip inspection is to:
A. Pump the brake pedal and listen
B. Inspect air brake system components, check slack adjusters,
and test brake response
C. Ignore them if the vehicle is new
D. Only test while driving
