ELDT CDL Theory Exam Prep practice questions and answers 2026. Tap an option to test yourself — you'll see the correct answer and a plain-English explanation for every question. Free, no login.
Q11What is the main purpose of the annual inspection required for commercial vehicles?
✓ Correct answer: B. To ensure vehicles meet minimum federal safety standards
The annual inspection ensures vehicles meet minimum safety standards to operate on public roads, helping prevent accidents due to mechanical failures.
Q12Which fluid should be checked for contamination by looking for a milky appearance?
✓ Correct answer: A. Engine oil
A milky appearance in engine oil typically indicates coolant contamination, which can cause serious engine damage if not addressed promptly.
Q13What component should be checked for cracks, illegal welds, and proper operation during a pre-trip inspection?
✓ Correct answer: D. Fifth wheel
The fifth wheel is a critical coupling component that must be thoroughly inspected for any defects that could lead to trailer separation while driving.
Q14What information must be recorded if a driver is placed out of service during a roadside inspection?
✓ Correct answer: C. All information from the inspection report in the driver's daily log
When placed out of service, the driver must record all information from the inspection report in their daily log to maintain accurate records of their compliance status.
Q15What is required of a motor carrier regarding vehicle maintenance?
✓ Correct answer: B. Maintain a systematic inspection, repair, and maintenance program
Federal regulations require carriers to have a systematic program that includes regular inspections, repairs, and maintenance to ensure vehicles are safe to operate.
Q16If a vehicle has been placed out of service during an inspection, when may it be operated again?
✓ Correct answer: A. After all required repairs have been completed and documented
A vehicle placed out of service cannot be legally operated until all required repairs are completed and documented to ensure safety compliance.
Q17What should be checked on all air brake equipped vehicles before operation?
✓ Correct answer: D. Air brake system leakage rate
Air brake system leakage rate must be checked to ensure the system can maintain adequate pressure for safe braking performance.
Q18What documentation must be in the vehicle to prove it has passed the required annual inspection?
✓ Correct answer: C. A copy of the annual inspection report or a decal/sticker
Federal regulations require either a copy of the annual inspection report or a decal/sticker to be maintained with the vehicle as proof of inspection compliance.
Q19What should a driver do if they discover a critical safety defect during a pre-trip inspection?
✓ Correct answer: B. Report it immediately and ensure repairs before operating the vehicle
Safety defects must be repaired before operation because driving with a known critical safety defect is dangerous and violates federal regulations.
Q20How should a driver document the results of a roadside inspection?
✓ Correct answer: A. Submit all roadside inspection reports to the motor carrier within 24 hours
Drivers must submit all roadside inspection reports to their motor carrier within 24 hours to ensure proper tracking of compliance issues and necessary repairs.
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