TEXAS COMMERCIAL DRIVER’S LICENSE (CDL) EXAM |
QUESTIONS AND ANSWERS | VERIFIED ANSWERS PLUS
RATIONALES | EXAM ALREADY GRADED A+ | LATEST EXAM
UPDATE
1. What is the primary purpose of a commercial driver performing a pre-trip inspection?
A) To impress the inspector
B) To ensure the vehicle is safe to operate
C) To check fuel efficiency
D) To estimate delivery time
Answer: B – To ensure the vehicle is safe to operate. Pre-trip inspections identify mechanical
problems before driving, preventing accidents.
2. When driving a commercial vehicle, how often should you check your mirrors?
A) Only when changing lanes
B) Every 5–8 seconds
C) Only in city traffic
D) Only on highways
Answer: B – Every 5–8 seconds. Frequent mirror checks help monitor traffic and prevent
collisions.
3. Which document must a commercial driver carry at all times while operating a CDL
vehicle?
A) Driver’s license only
B) Insurance policy
C) Commercial Driver’s License (CDL) and medical certificate
D) Vehicle registration only
Answer: C – Commercial Driver’s License (CDL) and medical certificate. These are required by
law to operate commercial vehicles.
4. What is the maximum gross vehicle weight rating (GVWR) for a vehicle requiring a
Class C CDL?
A) 10,000 lbs
B) 26,000 lbs
C) 33,000 lbs
D) 40,000 lbs
Answer: B – 26,000 lbs. Vehicles over 26,000 lbs require a Class B or A CDL.
5. When backing a commercial vehicle, the safest method is to:
A) Rely solely on mirrors
B) Back quickly to reduce time in traffic
C) Use a helper or spotter if available
D) Honk continuously
,Answer: C – Use a helper or spotter if available. A spotter can guide you safely and prevent
accidents.
6. What is “oversteering” in a commercial vehicle?
A) Turning the steering wheel too little
B) Turning the steering wheel too sharply
C) Driving too fast in reverse
D) Failing to signal
Answer: B – Turning the steering wheel too sharply. Oversteering can cause loss of control or
jackknifing.
7. What should a driver do when approaching a railroad crossing with flashing lights?
A) Speed up to cross quickly
B) Stop at least 15 feet from the tracks
C) Drive slowly and look both ways
D) Ignore it if no train is visible
Answer: B – Stop at least 15 feet from the tracks. This ensures safety in case a train is
approaching.
8. Which of the following is a proper method to secure cargo?
A) Use ropes that are too weak to stretch
B) Ensure it cannot shift, tip, or fall
C) Cover with only a tarp
D) Lean cargo against the walls of the trailer
Answer: B – Ensure it cannot shift, tip, or fall. Properly secured cargo prevents accidents and
maintains vehicle stability.
9. What is the “no-zone” around a commercial truck?
A) Areas in the truck where cargo is stored
B) Blind spots where the driver cannot see other vehicles
C) The passenger seating area
D) The truck’s fuel tank
Answer: B – Blind spots where the driver cannot see other vehicles. These zones are dangerous
for other drivers and must be avoided.
10. When should you use low beams instead of high beams?
A) On an open highway
B) In fog, rain, or snow
C) At all times
D) Only during daytime
Answer: B – In fog, rain, or snow. Low beams reduce glare and improve visibility in poor
weather conditions.
11. How can you prevent brake failure on a long downhill grade?
A) Use only engine braking and proper gear selection
B) Pump the brakes continuously
,C) Shift into neutral
D) Increase speed
Answer: A – Use engine braking and proper gear selection. This prevents overheating and brake
fade.
12. What is the proper procedure if a commercial vehicle starts to skid?
A) Slam on the brakes
B) Steer in the direction of the skid and ease off the accelerator
C) Turn the wheel sharply the opposite way
D) Accelerate quickly
Answer: B – Steer in the direction of the skid and ease off the accelerator. This helps regain
control safely.
13. When must a driver use a reflective triangle after stopping on a highway?
A) Only during the day
B) When stopped for more than 10 minutes
C) Whenever visibility is reduced or in case of breakdown
D) Never
Answer: C – Whenever visibility is reduced or in case of breakdown. This warns other drivers
and prevents accidents.
14. What is the key purpose of a commercial driver’s logbook?
A) To calculate fuel expenses
B) To document hours of service (HOS) for safety compliance
C) To track deliveries
D) To impress the employer
Answer: B – To document hours of service (HOS) for safety compliance. Proper logging
prevents driver fatigue and legal violations.
15. What is the correct method for making a right turn in a commercial vehicle?
A) Swing wide left first, then turn right
B) Turn sharply without signaling
C) Signal, slow down, and turn from the proper lane
D) Turn as quickly as possible
Answer: C – Signal, slow down, and turn from the proper lane. This prevents collisions with
pedestrians or other vehicles.
16. Which factor contributes most to rollover risks in commercial vehicles?
A) Driving at moderate speeds
B) Sharp turns at high speeds, especially with high center-of-gravity loads
C) Evenly loaded cargo
D) Driving downhill slowly
Answer: B – Sharp turns at high speeds with high loads. Rollover risk increases with speed and
high center-of-gravity cargo.
, 17. What is the purpose of an air brake system in commercial vehicles?
A) To increase fuel efficiency
B) To provide stronger braking and prevent brake fade
C) To reduce tire wear
D) To control steering
Answer: B – To provide stronger braking and prevent brake fade. Air brakes are essential for
heavy vehicles.
18. When should a commercial driver use a hazard warning light?
A) Only when parked at the depot
B) During emergencies or vehicle breakdowns
C) While driving on the highway
D) To indicate a turn
Answer: B – During emergencies or vehicle breakdowns. Hazard lights alert others to potential
danger.
19. How far ahead should a commercial driver scan the road in normal conditions?
A) 50–100 feet
B) 12–15 seconds ahead
C) 1 mile ahead
D) Only at intersections
Answer: B – 12–15 seconds ahead. Scanning ahead helps anticipate traffic changes and hazards.
20. Which factor is most critical in preventing tire blowouts?
A) Color of the tires
B) Proper tire inflation, load limits, and inspection
C) Driving speed only
D) Type of fuel
Answer: B – Proper tire inflation, load limits, and inspection. Maintaining tires reduces
blowouts and accidents.
21. What is the maximum allowable blood alcohol concentration (BAC) for a CDL driver
in Texas?
A) 0.08%
B) 0.04%
C) 0.10%
D) 0.02%
Answer: B – 0.04%. Federal law sets 0.04% BAC as the maximum for CDL drivers operating
commercial vehicles.
22. When driving a truck with a trailer, the “swing” of the trailer refers to:
A) The trailer’s tendency to roll on curves
B) The rear end of the trailer moving out during a turn
C) The trailer’s cargo shifting
D) The suspension movement
QUESTIONS AND ANSWERS | VERIFIED ANSWERS PLUS
RATIONALES | EXAM ALREADY GRADED A+ | LATEST EXAM
UPDATE
1. What is the primary purpose of a commercial driver performing a pre-trip inspection?
A) To impress the inspector
B) To ensure the vehicle is safe to operate
C) To check fuel efficiency
D) To estimate delivery time
Answer: B – To ensure the vehicle is safe to operate. Pre-trip inspections identify mechanical
problems before driving, preventing accidents.
2. When driving a commercial vehicle, how often should you check your mirrors?
A) Only when changing lanes
B) Every 5–8 seconds
C) Only in city traffic
D) Only on highways
Answer: B – Every 5–8 seconds. Frequent mirror checks help monitor traffic and prevent
collisions.
3. Which document must a commercial driver carry at all times while operating a CDL
vehicle?
A) Driver’s license only
B) Insurance policy
C) Commercial Driver’s License (CDL) and medical certificate
D) Vehicle registration only
Answer: C – Commercial Driver’s License (CDL) and medical certificate. These are required by
law to operate commercial vehicles.
4. What is the maximum gross vehicle weight rating (GVWR) for a vehicle requiring a
Class C CDL?
A) 10,000 lbs
B) 26,000 lbs
C) 33,000 lbs
D) 40,000 lbs
Answer: B – 26,000 lbs. Vehicles over 26,000 lbs require a Class B or A CDL.
5. When backing a commercial vehicle, the safest method is to:
A) Rely solely on mirrors
B) Back quickly to reduce time in traffic
C) Use a helper or spotter if available
D) Honk continuously
,Answer: C – Use a helper or spotter if available. A spotter can guide you safely and prevent
accidents.
6. What is “oversteering” in a commercial vehicle?
A) Turning the steering wheel too little
B) Turning the steering wheel too sharply
C) Driving too fast in reverse
D) Failing to signal
Answer: B – Turning the steering wheel too sharply. Oversteering can cause loss of control or
jackknifing.
7. What should a driver do when approaching a railroad crossing with flashing lights?
A) Speed up to cross quickly
B) Stop at least 15 feet from the tracks
C) Drive slowly and look both ways
D) Ignore it if no train is visible
Answer: B – Stop at least 15 feet from the tracks. This ensures safety in case a train is
approaching.
8. Which of the following is a proper method to secure cargo?
A) Use ropes that are too weak to stretch
B) Ensure it cannot shift, tip, or fall
C) Cover with only a tarp
D) Lean cargo against the walls of the trailer
Answer: B – Ensure it cannot shift, tip, or fall. Properly secured cargo prevents accidents and
maintains vehicle stability.
9. What is the “no-zone” around a commercial truck?
A) Areas in the truck where cargo is stored
B) Blind spots where the driver cannot see other vehicles
C) The passenger seating area
D) The truck’s fuel tank
Answer: B – Blind spots where the driver cannot see other vehicles. These zones are dangerous
for other drivers and must be avoided.
10. When should you use low beams instead of high beams?
A) On an open highway
B) In fog, rain, or snow
C) At all times
D) Only during daytime
Answer: B – In fog, rain, or snow. Low beams reduce glare and improve visibility in poor
weather conditions.
11. How can you prevent brake failure on a long downhill grade?
A) Use only engine braking and proper gear selection
B) Pump the brakes continuously
,C) Shift into neutral
D) Increase speed
Answer: A – Use engine braking and proper gear selection. This prevents overheating and brake
fade.
12. What is the proper procedure if a commercial vehicle starts to skid?
A) Slam on the brakes
B) Steer in the direction of the skid and ease off the accelerator
C) Turn the wheel sharply the opposite way
D) Accelerate quickly
Answer: B – Steer in the direction of the skid and ease off the accelerator. This helps regain
control safely.
13. When must a driver use a reflective triangle after stopping on a highway?
A) Only during the day
B) When stopped for more than 10 minutes
C) Whenever visibility is reduced or in case of breakdown
D) Never
Answer: C – Whenever visibility is reduced or in case of breakdown. This warns other drivers
and prevents accidents.
14. What is the key purpose of a commercial driver’s logbook?
A) To calculate fuel expenses
B) To document hours of service (HOS) for safety compliance
C) To track deliveries
D) To impress the employer
Answer: B – To document hours of service (HOS) for safety compliance. Proper logging
prevents driver fatigue and legal violations.
15. What is the correct method for making a right turn in a commercial vehicle?
A) Swing wide left first, then turn right
B) Turn sharply without signaling
C) Signal, slow down, and turn from the proper lane
D) Turn as quickly as possible
Answer: C – Signal, slow down, and turn from the proper lane. This prevents collisions with
pedestrians or other vehicles.
16. Which factor contributes most to rollover risks in commercial vehicles?
A) Driving at moderate speeds
B) Sharp turns at high speeds, especially with high center-of-gravity loads
C) Evenly loaded cargo
D) Driving downhill slowly
Answer: B – Sharp turns at high speeds with high loads. Rollover risk increases with speed and
high center-of-gravity cargo.
, 17. What is the purpose of an air brake system in commercial vehicles?
A) To increase fuel efficiency
B) To provide stronger braking and prevent brake fade
C) To reduce tire wear
D) To control steering
Answer: B – To provide stronger braking and prevent brake fade. Air brakes are essential for
heavy vehicles.
18. When should a commercial driver use a hazard warning light?
A) Only when parked at the depot
B) During emergencies or vehicle breakdowns
C) While driving on the highway
D) To indicate a turn
Answer: B – During emergencies or vehicle breakdowns. Hazard lights alert others to potential
danger.
19. How far ahead should a commercial driver scan the road in normal conditions?
A) 50–100 feet
B) 12–15 seconds ahead
C) 1 mile ahead
D) Only at intersections
Answer: B – 12–15 seconds ahead. Scanning ahead helps anticipate traffic changes and hazards.
20. Which factor is most critical in preventing tire blowouts?
A) Color of the tires
B) Proper tire inflation, load limits, and inspection
C) Driving speed only
D) Type of fuel
Answer: B – Proper tire inflation, load limits, and inspection. Maintaining tires reduces
blowouts and accidents.
21. What is the maximum allowable blood alcohol concentration (BAC) for a CDL driver
in Texas?
A) 0.08%
B) 0.04%
C) 0.10%
D) 0.02%
Answer: B – 0.04%. Federal law sets 0.04% BAC as the maximum for CDL drivers operating
commercial vehicles.
22. When driving a truck with a trailer, the “swing” of the trailer refers to:
A) The trailer’s tendency to roll on curves
B) The rear end of the trailer moving out during a turn
C) The trailer’s cargo shifting
D) The suspension movement
