Commercial Driver’s License (CDL) Class B
Practice Exam Questions With Correct Answers
(Verified Answers) Plus Rationales 2026 Q&A |
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1. What type of vehicle is typically operated with a Class B CDL?
A. Combination vehicles with trailers over 10,000 lbs
B. Vehicles designed to carry more than 16 passengers
C. Single vehicles with a GVWR of 26,001 lbs or more
D. Motorcycles
Answer: C
Rationale: A Class B CDL allows operation of single vehicles with
a Gross Vehicle Weight Rating (GVWR) of 26,001 pounds or
more, including buses and straight trucks, but not heavy
combination vehicles.
2. What is the purpose of a pre-trip inspection?
A. To check fuel economy
B. To ensure the vehicle is safe to operate
, C. To record mileage
D. To test the radio
Answer: B
Rationale: A pre-trip inspection ensures all systems are
functioning properly and identifies safety issues before driving.
3. What does GVWR stand for?
A. Gross Vehicle Weight Ratio
B. General Vehicle Weight Rating
C. Gross Vehicle Weight Rating
D. Gross Verified Weight Range
Answer: C
Rationale: GVWR is the maximum allowable total weight of a
vehicle including cargo and passengers.
4. When should you use your hazard lights?
A. Only at night
B. When parked illegally
C. When stopped or traveling slowly on the roadway
D. Only in bad weather
Answer: C
, Rationale: Hazard lights warn other drivers when your vehicle is
stopped or moving significantly slower than traffic.
5. What is the minimum tread depth for front tires on a commercial
vehicle?
A. 2/32 inch
B. 4/32 inch
C. 1/32 inch
D. 3/32 inch
Answer: B
Rationale: Federal regulations require at least 4/32 inch tread
depth on front tires for safety.
6. What should you do if your brakes fail while driving?
A. Speed up
B. Pump the brakes and downshift
C. Turn off the engine
D. Exit the vehicle immediately
Answer: B
Rationale: Pumping brakes may restore pressure, and
downshifting helps slow the vehicle safely.
, 7. What is the proper following distance for large vehicles?
A. 1 second per 10 feet of vehicle length
B. 2 seconds total
C. 5 seconds minimum
D. 10 seconds always
Answer: A
Rationale: CDL guidelines recommend at least 1 second per 10
feet of vehicle length, increasing with speed.
8. What does a flashing red traffic light mean?
A. Slow down
B. Stop and proceed when safe
C. Yield
D. Continue with caution
Answer: B
Rationale: A flashing red light is treated like a stop sign; full stop
is required.
9. When backing a vehicle, you should:
A. Use only mirrors
Practice Exam Questions With Correct Answers
(Verified Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. What type of vehicle is typically operated with a Class B CDL?
A. Combination vehicles with trailers over 10,000 lbs
B. Vehicles designed to carry more than 16 passengers
C. Single vehicles with a GVWR of 26,001 lbs or more
D. Motorcycles
Answer: C
Rationale: A Class B CDL allows operation of single vehicles with
a Gross Vehicle Weight Rating (GVWR) of 26,001 pounds or
more, including buses and straight trucks, but not heavy
combination vehicles.
2. What is the purpose of a pre-trip inspection?
A. To check fuel economy
B. To ensure the vehicle is safe to operate
, C. To record mileage
D. To test the radio
Answer: B
Rationale: A pre-trip inspection ensures all systems are
functioning properly and identifies safety issues before driving.
3. What does GVWR stand for?
A. Gross Vehicle Weight Ratio
B. General Vehicle Weight Rating
C. Gross Vehicle Weight Rating
D. Gross Verified Weight Range
Answer: C
Rationale: GVWR is the maximum allowable total weight of a
vehicle including cargo and passengers.
4. When should you use your hazard lights?
A. Only at night
B. When parked illegally
C. When stopped or traveling slowly on the roadway
D. Only in bad weather
Answer: C
, Rationale: Hazard lights warn other drivers when your vehicle is
stopped or moving significantly slower than traffic.
5. What is the minimum tread depth for front tires on a commercial
vehicle?
A. 2/32 inch
B. 4/32 inch
C. 1/32 inch
D. 3/32 inch
Answer: B
Rationale: Federal regulations require at least 4/32 inch tread
depth on front tires for safety.
6. What should you do if your brakes fail while driving?
A. Speed up
B. Pump the brakes and downshift
C. Turn off the engine
D. Exit the vehicle immediately
Answer: B
Rationale: Pumping brakes may restore pressure, and
downshifting helps slow the vehicle safely.
, 7. What is the proper following distance for large vehicles?
A. 1 second per 10 feet of vehicle length
B. 2 seconds total
C. 5 seconds minimum
D. 10 seconds always
Answer: A
Rationale: CDL guidelines recommend at least 1 second per 10
feet of vehicle length, increasing with speed.
8. What does a flashing red traffic light mean?
A. Slow down
B. Stop and proceed when safe
C. Yield
D. Continue with caution
Answer: B
Rationale: A flashing red light is treated like a stop sign; full stop
is required.
9. When backing a vehicle, you should:
A. Use only mirrors
