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Hazardous Materials (Hazmat) Practice Question 24

H or XHazardous Materials (Hazmat) · Question 24

When fueling a placarded vehicle:

• AThe engine should be running
• BThe engine must be off and someone must be at the nozzle
• COnly one person should be present
• DStatic straps may be removed

Correct answer: B. The engine must be off and someone must be at the nozzle

Why: Engine off, nozzle attended at all times, and bonding/grounding precautions must be observed when fueling tankers carrying flammable cargo.

How this question fits the Hazmat test

Mishandled hazmat causes catastrophic public consequences. The endorsement is restricted, requires fingerprint background screening through the TSA, and demands deeper familiarity with regulatory paperwork than any other CDL endorsement.

Study technique for this topic

Master the Hazardous Materials Table columns, know the placarding thresholds, and learn which classes can never be loaded together. Practice locating UN/NA identification numbers and understanding the segregation chart.

Related Hazmat practice questions

• Q60. Bulk packaging is generally:
• Q9. Hazmat ID numbers begin with:
• Q22. Class 8 hazardous materials are:
• Q36. When transporting Class 7 radioactive materials, you may need to track:
• Q49. A driver should refuse a leaking package because:

Continue your CDL preparation

The Hazardous Materials (Hazmat) portion of the CDL knowledge exam covers more than this single question. Use this site's full Hazardous Materials (Hazmat) bank to drill every topic, then test yourself with one of our state-specific practice sets to confirm you are ready for the actual DMV exam in your state. Always check your state's CDL handbook for any local addenda before the test day.

If you are still building your overall CDL foundation, start with the General Knowledge bank — every CDL applicant must pass it — and then work outward to the endorsements you plan to add.