CDL Class B Exam Questions and Correct
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Rationales 2026 Q&A | Instant
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Question 1
What is the primary purpose of a pre-trip inspection?
A. To increase fuel economy
B. To identify safety defects before driving
C. To clean the vehicle
D. To improve engine performance
Correct Answer: B
Rationale:
A pre-trip inspection helps identify mechanical or safety problems before
operating the vehicle.
Question 2
A Commercial Driver License (CDL) Class B allows operation of:
A. Motorcycles only
B. Single vehicles with a GVWR of 26,001 pounds or more
C. Passenger cars only
D. Boats
Correct Answer: B
,Rationale:
A Class B CDL authorizes operation of heavy single vehicles with a GVWR of
26,001 pounds or more, and certain combinations where the towed vehicle is
within the legal weight limit.
Question 3
GVWR stands for:
A. General Vehicle Weight Rating
B. Gross Vehicle Weight Rating
C. Government Vehicle Weight Rule
D. Gross Volume Weight Requirement
Correct Answer: B
Rationale:
GVWR is the maximum safe operating weight established by the manufacturer.
Question 4
Before starting the engine, the parking brake should be:
A. Released
B. Applied
C. Removed
D. Ignored
Correct Answer: B
Rationale:
Applying the parking brake helps prevent unintended vehicle movement during
startup.
Question 5
During a vehicle inspection, tire tread should be checked for:
,A. Paint color
B. Adequate depth and damage
C. Wheel alignment only
D. Engine temperature
Correct Answer: B
Rationale:
Proper tread depth and tire condition are essential for safe traction.
Question 6
A damaged tire may increase the risk of:
A. Better fuel economy
B. Tire failure
C. Faster acceleration
D. Improved steering
Correct Answer: B
Rationale:
Damaged tires are more likely to fail while driving.
Question 7
Mirrors should be adjusted:
A. After beginning the trip
B. Before driving
C. Only when backing
D. Only at night
Correct Answer: B
Rationale:
Proper mirror adjustment before driving improves visibility and safety.
, Question 8
The purpose of the parking brake is to:
A. Increase engine speed
B. Prevent vehicle movement when parked
C. Improve steering
D. Reduce fuel use
Correct Answer: B
Rationale:
The parking brake secures the vehicle when it is stopped.
Question 9
A vehicle horn should be checked during the pre-trip inspection because it is used
to:
A. Improve fuel economy
B. Warn others of your presence
C. Increase engine power
D. Measure speed
Correct Answer: B
Rationale:
A functioning horn is an important safety device.
Question 10
Windshield wipers should be inspected for:
A. Tire pressure
B. Proper operation and blade condition
C. Fuel level
D. Brake adjustment
Correct Answer: B
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
Question 1
What is the primary purpose of a pre-trip inspection?
A. To increase fuel economy
B. To identify safety defects before driving
C. To clean the vehicle
D. To improve engine performance
Correct Answer: B
Rationale:
A pre-trip inspection helps identify mechanical or safety problems before
operating the vehicle.
Question 2
A Commercial Driver License (CDL) Class B allows operation of:
A. Motorcycles only
B. Single vehicles with a GVWR of 26,001 pounds or more
C. Passenger cars only
D. Boats
Correct Answer: B
,Rationale:
A Class B CDL authorizes operation of heavy single vehicles with a GVWR of
26,001 pounds or more, and certain combinations where the towed vehicle is
within the legal weight limit.
Question 3
GVWR stands for:
A. General Vehicle Weight Rating
B. Gross Vehicle Weight Rating
C. Government Vehicle Weight Rule
D. Gross Volume Weight Requirement
Correct Answer: B
Rationale:
GVWR is the maximum safe operating weight established by the manufacturer.
Question 4
Before starting the engine, the parking brake should be:
A. Released
B. Applied
C. Removed
D. Ignored
Correct Answer: B
Rationale:
Applying the parking brake helps prevent unintended vehicle movement during
startup.
Question 5
During a vehicle inspection, tire tread should be checked for:
,A. Paint color
B. Adequate depth and damage
C. Wheel alignment only
D. Engine temperature
Correct Answer: B
Rationale:
Proper tread depth and tire condition are essential for safe traction.
Question 6
A damaged tire may increase the risk of:
A. Better fuel economy
B. Tire failure
C. Faster acceleration
D. Improved steering
Correct Answer: B
Rationale:
Damaged tires are more likely to fail while driving.
Question 7
Mirrors should be adjusted:
A. After beginning the trip
B. Before driving
C. Only when backing
D. Only at night
Correct Answer: B
Rationale:
Proper mirror adjustment before driving improves visibility and safety.
, Question 8
The purpose of the parking brake is to:
A. Increase engine speed
B. Prevent vehicle movement when parked
C. Improve steering
D. Reduce fuel use
Correct Answer: B
Rationale:
The parking brake secures the vehicle when it is stopped.
Question 9
A vehicle horn should be checked during the pre-trip inspection because it is used
to:
A. Improve fuel economy
B. Warn others of your presence
C. Increase engine power
D. Measure speed
Correct Answer: B
Rationale:
A functioning horn is an important safety device.
Question 10
Windshield wipers should be inspected for:
A. Tire pressure
B. Proper operation and blade condition
C. Fuel level
D. Brake adjustment
Correct Answer: B
