Cargo Tank Specifications & Equipment
6 free questions, part of the Hazmat (H) Endorsement CDL practice test
Cargo tank specs like the MC 306 and MC 331 determine what a tank can legally haul, and 49 CFR 180.415 requires every specification tank to display its inspection and test history. ELDT.io's free bank covers all 6 cargo tank and emergency equipment questions on the hazmat test, including fire extinguisher ratings and the extra kit chlorine tanks require.
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What fire extinguisher rating do I need for a placarded power unit?
Under 49 CFR 393.95, a placarded power unit needs a fire extinguisher rated at least 10 B:C, mounted so it is readily accessible, not a smaller unit grabbed from a personal vehicle or buried in the trailer.
Can I move a cargo tank with the manhole cover still open after unloading?
No. Under 49 CFR 177.834(j), all closures have to be secured before the vehicle moves, even if only trace residue is left in the tank.