C Exam Practice Questions And Correct

CDL General Knowledge (Class A, B, or

• Exam Practice Questions And Correct

Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the main reason for performing a pre-trip inspection?
• To check if the truck looks clean
• To ensure the vehicle is safe to drive
• To test your driving skills
• To check if the cargo is heavy

Rationale: Pre-trip inspections help identify safety issues before

driving, preventing accidents.

• How often should you check your mirrors while driving?
• Once per hour
• Only when changing lanes
• Frequently, at regular intervals 1 / 4

• Only at intersections

Rationale: Frequent mirror checks ensure awareness of surrounding

traffic and potential hazards.

• When is it safe to drive with a cracked windshield?
• If it’s small and on the edge
• Only during daytime
• Only on highways
• Never

Rationale: Cracks can obstruct vision or worsen while driving, making

it unsafe.

• How much space should you keep between your truck and the vehicle

in front under normal conditions?

• 1 second
• 2 seconds
• At least 4 seconds
• 6 seconds

Rationale: A 4-second following distance allows time to react and

stop safely.

• What is the primary cause of most truck accidents?
• Bad weather
• Poor brakes
• Driver error
• Road conditions 2 / 4

Rationale: Human error, such as distraction or misjudgment, is the

leading cause of accidents.

6. When approaching a curve, you should:

• Speed up to maintain momentum
• Brake sharply in the curve
• Slow down before entering the curve
• Steer straight through

Rationale: Slowing down before a curve prevents rollover or loss of

control.

• Which of the following is true about tire pressure?
• Under-inflated tires last longer
• Proper tire pressure prevents blowouts
• Over-inflated tires are safer
• Tire pressure doesn’t affect safety

Rationale: Correct tire pressure ensures even wear and reduces the

risk of blowouts.

• How should you use brakes on a steep downgrade?
• Hold down the brake pedal continuously
• Use a low gear and apply brakes intermittently
• Coast and only brake if necessary
• Pump brakes rapidly

Rationale: Engine braking combined with intermittent braking

prevents brake overheating. 3 / 4

• What is the safest way to back a large vehicle?
• Quickly to save time
• Without looking around
• With a spotter whenever possible
• Only by using mirrors

Rationale: A spotter helps prevent accidents by providing guidance

when visibility is limited.

10. When driving in fog, you should use:

• High-beam headlights
• Low-beam headlights
• Hazard lights only
• No lights

Rationale: Low beams reduce glare and improve visibility in fog.

• What should you do if your brakes fail while driving?
• Stop immediately without slowing
• Shift into neutral and coast
• Use the parking brake gradually and shift to a lower gear
• Speed up to a safer area

Rationale: Using engine and parking brakes helps slow the vehicle

safely without sudden stops.

• What is the main purpose of the vehicle’s suspension system?
• Increase engine power
• Improve fuel efficiency
• / 4