Ohio CDL Exam Practice Questions And
Correct Answers (Verified Answers) Plus
Rationales 2025|2026 Q&A | Instant
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1. What is the maximum allowable blood alcohol concentration (BAC) for
a CDL driver?
A. 0.08%
B. 0.04%
C. 0.06%
D. 0.02%
CDL drivers are held to stricter standards. A BAC of 0.04% or higher
can result in disqualification.
2. When transporting hazardous materials, you must have:
A. A passenger endorsement
B. A hazardous materials endorsement
C. A tank vehicle endorsement
, D. A doubles/triples endorsement
Drivers must be specially tested and cleared for hazardous materials.
3. What is the main purpose of vehicle inspections?
A. To satisfy law enforcement
B. To reduce insurance costs
C. To ensure safe operation
D. To save fuel
Inspections prevent accidents by detecting mechanical issues early.
4. Which brake system uses compressed air?
A. Hydraulic brakes
B. Air brakes
C. Vacuum brakes
D. Mechanical brakes
Commercial trucks commonly use air brakes for stopping heavy
loads.
5. What should you do if your brakes get wet while driving?
A. Accelerate quickly
B. Stop immediately
C. Gently apply the brakes to create heat
D. Drive faster to dry them
Applying brakes lightly helps dry the system safely.
6. Which document must be in the vehicle when hauling hazardous
materials?
, A. Driver’s logbook
B. Shipping papers
C. Vehicle title
D. Trip permit
Shipping papers identify the materials being transported for safety
and emergency response.
7. What is the proper way to check for hydraulic brake leaks?
A. Press accelerator and brake
B. Pump brake pedal three times and hold
C. Check mirrors while braking
D. Measure brake chamber stroke
Holding pressure on the brake pedal will show if it slowly sinks,
indicating a leak.
8. Which factor is most important in safe driving on curves?
A. Lane position
B. Speed
C. Tire tread
D. Engine RPM
Excessive speed is the main cause of rollovers on curves.
9. A commercial vehicle must have how many red reflective triangles?
A. One
B. Two
C. Three
Correct Answers (Verified Answers) Plus
Rationales 2025|2026 Q&A | Instant
Download Pdf
1. What is the maximum allowable blood alcohol concentration (BAC) for
a CDL driver?
A. 0.08%
B. 0.04%
C. 0.06%
D. 0.02%
CDL drivers are held to stricter standards. A BAC of 0.04% or higher
can result in disqualification.
2. When transporting hazardous materials, you must have:
A. A passenger endorsement
B. A hazardous materials endorsement
C. A tank vehicle endorsement
, D. A doubles/triples endorsement
Drivers must be specially tested and cleared for hazardous materials.
3. What is the main purpose of vehicle inspections?
A. To satisfy law enforcement
B. To reduce insurance costs
C. To ensure safe operation
D. To save fuel
Inspections prevent accidents by detecting mechanical issues early.
4. Which brake system uses compressed air?
A. Hydraulic brakes
B. Air brakes
C. Vacuum brakes
D. Mechanical brakes
Commercial trucks commonly use air brakes for stopping heavy
loads.
5. What should you do if your brakes get wet while driving?
A. Accelerate quickly
B. Stop immediately
C. Gently apply the brakes to create heat
D. Drive faster to dry them
Applying brakes lightly helps dry the system safely.
6. Which document must be in the vehicle when hauling hazardous
materials?
, A. Driver’s logbook
B. Shipping papers
C. Vehicle title
D. Trip permit
Shipping papers identify the materials being transported for safety
and emergency response.
7. What is the proper way to check for hydraulic brake leaks?
A. Press accelerator and brake
B. Pump brake pedal three times and hold
C. Check mirrors while braking
D. Measure brake chamber stroke
Holding pressure on the brake pedal will show if it slowly sinks,
indicating a leak.
8. Which factor is most important in safe driving on curves?
A. Lane position
B. Speed
C. Tire tread
D. Engine RPM
Excessive speed is the main cause of rollovers on curves.
9. A commercial vehicle must have how many red reflective triangles?
A. One
B. Two
C. Three
