Commercial Driver’s License
(CDL) Knowledge Exam
Questions And Correct
Answers (Verified Answers)
Plus Rationales 2026 Q&A |
Instant Download Pdf
1. The primary purpose of a pre-trip inspection is to:
A. Impress the examiner
B. Ensure the vehicle is safe to operate
C. Increase fuel efficiency
D. Check cargo value
Answer: B. Ensure the vehicle is safe to operate
Rationale: Pre-trip inspections identify defects before driving.
2. A CDL driver should check tire pressure:
A. Once a year
B. Only when flat
C. Before every trip
D. Only during inspection by police
,Answer: C. Before every trip
Rationale: Proper tire pressure ensures safety and fuel efficiency.
3. The “no-zone” refers to:
A. Rest areas
B. Blind spots around a truck
C. Restricted highways
D. Loading docks only
Answer: B. Blind spots around a truck
Rationale: Large vehicles have significant blind spots.
4. A vehicle’s stopping distance is affected by:
A. Road conditions only
B. Speed, weight, road, and driver reaction
C. Music volume
D. Weather only
Answer: B. Speed, weight, road, and driver reaction
Rationale: Multiple factors affect stopping distance.
5. Hydroplaning occurs when:
A. Tires lose contact with the road due to water
B. Engine overheats
C. Brakes lock
D. Fuel is low
Answer: A. Tires lose contact with the road due to water
Rationale: Water builds under tires at high speed.
6. The safest way to handle a skid is to:
, A. Brake hard
B. Steer into the skid
C. Turn opposite direction quickly
D. Accelerate fully
Answer: B. Steer into the skid
Rationale: Steering into skid helps regain control.
7. A CDL driver must inspect brakes:
A. Weekly
B. Before trips and regularly
C. Never
D. Only after accidents
Answer: B. Before trips and regularly
Rationale: Brake failure is a major safety risk.
8. Air brakes are powered by:
A. Hydraulic fluid
B. Compressed air
C. Electricity only
D. Fuel pressure
Answer: B. Compressed air
Rationale: Air pressure operates braking system.
9. If air pressure drops too low, the spring brakes:
A. Release automatically
B. Apply automatically
C. Become stronger
D. Stop working
(CDL) Knowledge Exam
Questions And Correct
Answers (Verified Answers)
Plus Rationales 2026 Q&A |
Instant Download Pdf
1. The primary purpose of a pre-trip inspection is to:
A. Impress the examiner
B. Ensure the vehicle is safe to operate
C. Increase fuel efficiency
D. Check cargo value
Answer: B. Ensure the vehicle is safe to operate
Rationale: Pre-trip inspections identify defects before driving.
2. A CDL driver should check tire pressure:
A. Once a year
B. Only when flat
C. Before every trip
D. Only during inspection by police
,Answer: C. Before every trip
Rationale: Proper tire pressure ensures safety and fuel efficiency.
3. The “no-zone” refers to:
A. Rest areas
B. Blind spots around a truck
C. Restricted highways
D. Loading docks only
Answer: B. Blind spots around a truck
Rationale: Large vehicles have significant blind spots.
4. A vehicle’s stopping distance is affected by:
A. Road conditions only
B. Speed, weight, road, and driver reaction
C. Music volume
D. Weather only
Answer: B. Speed, weight, road, and driver reaction
Rationale: Multiple factors affect stopping distance.
5. Hydroplaning occurs when:
A. Tires lose contact with the road due to water
B. Engine overheats
C. Brakes lock
D. Fuel is low
Answer: A. Tires lose contact with the road due to water
Rationale: Water builds under tires at high speed.
6. The safest way to handle a skid is to:
, A. Brake hard
B. Steer into the skid
C. Turn opposite direction quickly
D. Accelerate fully
Answer: B. Steer into the skid
Rationale: Steering into skid helps regain control.
7. A CDL driver must inspect brakes:
A. Weekly
B. Before trips and regularly
C. Never
D. Only after accidents
Answer: B. Before trips and regularly
Rationale: Brake failure is a major safety risk.
8. Air brakes are powered by:
A. Hydraulic fluid
B. Compressed air
C. Electricity only
D. Fuel pressure
Answer: B. Compressed air
Rationale: Air pressure operates braking system.
9. If air pressure drops too low, the spring brakes:
A. Release automatically
B. Apply automatically
C. Become stronger
D. Stop working
