Commercial Driver License (CDL) Knowledge
Test Exam Review with Answers and
Rationales | 100% Pass Guaranteed | Graded
A+
1. What is the main reason for conducting a pre-trip inspection?
A. To comply with company policy
B. To save fuel
C. To ensure the vehicle is safe to operate
D. To check delivery paperwork
Answer: C
Pre-trip inspections are required to identify safety defects before
driving.
2. When should you inspect your vehicle during a trip?
A. Only at the start of the day
B. Only if something feels wrong
C. Every 8 hours or 500 miles
D. At each stop and change of driver
Answer: D
Regular inspections help detect issues that may develop while driving.
3. Which component is part of the steering system?
A. Alternator
B. Pitman arm
C. Air compressor
D. Brake chamber
,Answer: B
The pitman arm transfers steering motion to the wheels.
4. How much free play is allowed in a steering wheel for a power
steering system?
A. 2 inches
B. 10 degrees (about 2 inches)
C. 20 degrees
D. No free play allowed
Answer: B
Excessive free play can indicate worn steering components.
5. What should you do if a tire has less than the required tread
depth?
A. Inflate it
B. Rotate it
C. Do not drive the vehicle
D. Reduce speed
Answer: C
Tires below legal tread depth are unsafe and illegal.
6. Minimum tread depth for steering axle tires is:
A. 1/32 inch
B. 4/32 inch
C. 2/32 inch
D. 6/32 inch
Answer: B
Steering tires require more tread for safe control.
, 7. What color should brake warning lights be?
A. Blue
B. Green
C. Yellow
D. Red
Answer: D
Red warning lights indicate serious safety issues.
8. What does ABS stand for?
A. Automatic Braking System
B. Anti-Brake Skid
C. Anti-lock Braking System
D. Advanced Brake Setup
Answer: C
ABS prevents wheel lock-up during hard braking.
9. When should you use engine braking?
A. On icy roads
B. During sharp turns
C. When descending long grades
D. In city traffic only
Answer: C
Engine braking helps control speed without overheating brakes.
10. What happens when brakes overheat?
Test Exam Review with Answers and
Rationales | 100% Pass Guaranteed | Graded
A+
1. What is the main reason for conducting a pre-trip inspection?
A. To comply with company policy
B. To save fuel
C. To ensure the vehicle is safe to operate
D. To check delivery paperwork
Answer: C
Pre-trip inspections are required to identify safety defects before
driving.
2. When should you inspect your vehicle during a trip?
A. Only at the start of the day
B. Only if something feels wrong
C. Every 8 hours or 500 miles
D. At each stop and change of driver
Answer: D
Regular inspections help detect issues that may develop while driving.
3. Which component is part of the steering system?
A. Alternator
B. Pitman arm
C. Air compressor
D. Brake chamber
,Answer: B
The pitman arm transfers steering motion to the wheels.
4. How much free play is allowed in a steering wheel for a power
steering system?
A. 2 inches
B. 10 degrees (about 2 inches)
C. 20 degrees
D. No free play allowed
Answer: B
Excessive free play can indicate worn steering components.
5. What should you do if a tire has less than the required tread
depth?
A. Inflate it
B. Rotate it
C. Do not drive the vehicle
D. Reduce speed
Answer: C
Tires below legal tread depth are unsafe and illegal.
6. Minimum tread depth for steering axle tires is:
A. 1/32 inch
B. 4/32 inch
C. 2/32 inch
D. 6/32 inch
Answer: B
Steering tires require more tread for safe control.
, 7. What color should brake warning lights be?
A. Blue
B. Green
C. Yellow
D. Red
Answer: D
Red warning lights indicate serious safety issues.
8. What does ABS stand for?
A. Automatic Braking System
B. Anti-Brake Skid
C. Anti-lock Braking System
D. Advanced Brake Setup
Answer: C
ABS prevents wheel lock-up during hard braking.
9. When should you use engine braking?
A. On icy roads
B. During sharp turns
C. When descending long grades
D. In city traffic only
Answer: C
Engine braking helps control speed without overheating brakes.
10. What happens when brakes overheat?
