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Missouri Class B CDL Exam Practice Questions Complete
(Verified Update!!!2026–2027)
Exam Blueprint Overview
A Missouri Class B CDL allows you to operate any single vehicle with a Gross
Vehicle Weight Rating (GVWR) of 26,001 pounds or more, or any such vehicle
towing a vehicle not in excess of 10,000 pounds GVWR . This is the license
required for straight trucks, dump trucks, box trucks, and large passenger buses.
Class B CDL holders may also operate all vehicles within Class C, as well as those
which may be driven by a holder of a Class E or Class F license .
Test Component Details
General Knowledge Test 50 questions; need 40 correct (80%) to pass
Air Brakes Test 25 questions; need 20 correct (80%) to pass
Endorsement Tests Varies by endorsement (HazMat, Tanker, Passenger, School Bus)
Important Note: Unlike Class A, the Class B CDL does NOT require the
Combination Vehicles test. You only need to take the Combination Vehicles test if
you plan to operate combination vehicles (which would require a Class A) . The
Class B knowledge tests include: General Knowledge, Air Brakes (if applicable), and
any endorsement tests for the type of vehicle you will operate.
Class B Endorsements: Hazardous Materials (H), Tank Vehicles (N), Tank Vehicles
Transporting Hazardous Materials (X), Passenger Transport (P), School Bus (S). The
Doubles/Triples (T) endorsement is only available for Class A driver's licenses .
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ELDT Requirement: Entry-Level Driver Training (ELDT) is required for anyone
obtaining a Class B CDL for the first time, upgrading their CDL, or adding hazmat,
passenger, or school bus endorsements .
SECTION 1: GENERAL KNOWLEDGE (Questions)
Vehicle Inspection & Basic Control
1. What is the most important reason to inspect your truck or
bus before driving?
A) To check the battery fluid level
B) To check the amount of fuel in the vehicle
C) Safety for yourself and others
D) To check the tire pressure
Correct Answer: C
Rationale: The most important reason for a pre-trip inspection
is safety. A pre-trip inspection helps you find problems that
could cause a crash, breakdown, or fire. Safety for yourself, your
passengers, and other motorists is the primary concern.
2. A Class B pre-trip inspection should take at minimum:
A) 5 minutes
B) 15 minutes
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C) 30 minutes
D) 60 minutes
Correct Answer: B
Rationale: A thorough pre-trip inspection should take at least
15 minutes to complete properly. Rushing through the
inspection increases the risk of missing critical safety defects.
3. Which of the following is checked in a pre-trip inspection?
A) Wiper blades
B) Steering wheel
C) All of the above
D) None of the above
Correct Answer: C
Rationale: A pre-trip inspection includes checking wiper blades,
the steering wheel, and many other components including tires,
brakes, lights, fluids, and emergency equipment.
4. If you find anything unsafe during the pre-trip inspection, you
are required to:
A) Get it fixed before driving
B) Write it in your inspection report
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C) Drive cautiously until it is fixed
D) Ignore it if it's minor
Correct Answer: A
Rationale: If you find anything unsafe during the pre-trip
inspection, you must get it fixed before driving. You should not
operate a vehicle with safety defects.
5. For proper steering, steering wheel play should be no more
than:
A) 30 degrees
B) 25 degrees
C) 10 degrees
D) 45 degrees
Correct Answer: C
Rationale: Steering wheel play should be no more than 10
degrees (about 2 inches at the rim of a 20-inch wheel).
Excessive play can make steering difficult and unsafe.
6. You should hold your steering wheel:
A) Firmly with both hands
B) Firmly with one hand
Missouri Class B CDL Exam Practice Questions Complete
(Verified Update!!!2026–2027)
Exam Blueprint Overview
A Missouri Class B CDL allows you to operate any single vehicle with a Gross
Vehicle Weight Rating (GVWR) of 26,001 pounds or more, or any such vehicle
towing a vehicle not in excess of 10,000 pounds GVWR . This is the license
required for straight trucks, dump trucks, box trucks, and large passenger buses.
Class B CDL holders may also operate all vehicles within Class C, as well as those
which may be driven by a holder of a Class E or Class F license .
Test Component Details
General Knowledge Test 50 questions; need 40 correct (80%) to pass
Air Brakes Test 25 questions; need 20 correct (80%) to pass
Endorsement Tests Varies by endorsement (HazMat, Tanker, Passenger, School Bus)
Important Note: Unlike Class A, the Class B CDL does NOT require the
Combination Vehicles test. You only need to take the Combination Vehicles test if
you plan to operate combination vehicles (which would require a Class A) . The
Class B knowledge tests include: General Knowledge, Air Brakes (if applicable), and
any endorsement tests for the type of vehicle you will operate.
Class B Endorsements: Hazardous Materials (H), Tank Vehicles (N), Tank Vehicles
Transporting Hazardous Materials (X), Passenger Transport (P), School Bus (S). The
Doubles/Triples (T) endorsement is only available for Class A driver's licenses .
, Page |2
ELDT Requirement: Entry-Level Driver Training (ELDT) is required for anyone
obtaining a Class B CDL for the first time, upgrading their CDL, or adding hazmat,
passenger, or school bus endorsements .
SECTION 1: GENERAL KNOWLEDGE (Questions)
Vehicle Inspection & Basic Control
1. What is the most important reason to inspect your truck or
bus before driving?
A) To check the battery fluid level
B) To check the amount of fuel in the vehicle
C) Safety for yourself and others
D) To check the tire pressure
Correct Answer: C
Rationale: The most important reason for a pre-trip inspection
is safety. A pre-trip inspection helps you find problems that
could cause a crash, breakdown, or fire. Safety for yourself, your
passengers, and other motorists is the primary concern.
2. A Class B pre-trip inspection should take at minimum:
A) 5 minutes
B) 15 minutes
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C) 30 minutes
D) 60 minutes
Correct Answer: B
Rationale: A thorough pre-trip inspection should take at least
15 minutes to complete properly. Rushing through the
inspection increases the risk of missing critical safety defects.
3. Which of the following is checked in a pre-trip inspection?
A) Wiper blades
B) Steering wheel
C) All of the above
D) None of the above
Correct Answer: C
Rationale: A pre-trip inspection includes checking wiper blades,
the steering wheel, and many other components including tires,
brakes, lights, fluids, and emergency equipment.
4. If you find anything unsafe during the pre-trip inspection, you
are required to:
A) Get it fixed before driving
B) Write it in your inspection report
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C) Drive cautiously until it is fixed
D) Ignore it if it's minor
Correct Answer: A
Rationale: If you find anything unsafe during the pre-trip
inspection, you must get it fixed before driving. You should not
operate a vehicle with safety defects.
5. For proper steering, steering wheel play should be no more
than:
A) 30 degrees
B) 25 degrees
C) 10 degrees
D) 45 degrees
Correct Answer: C
Rationale: Steering wheel play should be no more than 10
degrees (about 2 inches at the rim of a 20-inch wheel).
Excessive play can make steering difficult and unsafe.
6. You should hold your steering wheel:
A) Firmly with both hands
B) Firmly with one hand
