Before driving an interstate commercial truck, whose satisfaction with its safe operating condition is required even after a mechanic has worked on it?
Correct answer: The driver's
A repair visit does not remove the driver's pre-driving duty to be satisfied that the vehicle is safe.
Source: 49 CFR 396.13(a); interstate CMV scope ↗
The last required inspection report lists a repaired defect on the interstate truck you will drive. What does your required report signature acknowledge?
Correct answer: Your review and the certification of required repairs
The signature acknowledges review of the report and the repair certification; it is not a claim that the driver acted as mechanic.
Source: 49 CFR 396.13(b)–(c); same vehicle, not a detached towed unit; interstate CMV scope ↗
Under federal rules, may the driver-inspection reports for an interstate CMV be maintained electronically?
Correct answer: Yes, under the electronic-record requirements
Section 396.13(d) permits electronic reports in accordance with 49 CFR 390.32.
Source: 49 CFR 396.13(d), cross-reference 390.32; interstate CMV scope ↗
Before taking intermodal equipment onto the road in interstate service, what brake inspection does the driver rule describe?
Correct answer: A thorough visible-component check without crawling underneath
The intermodal inspection covers readily visible service-brake components and trailer connections, without requiring the driver to physically go underneath.
Source: 49 CFR 392.7(b), service-brake-components bullet; interstate CMV scope ↗
An interstate truck tire has belt material exposed through a sidewall cut. What do federal tire rules permit?
Correct answer: Do not operate the vehicle on that tire
Exposed ply or belt material is a prohibited tire condition, independent of tread depth.
Source: 49 CFR 393.75(a)(1),(4); interstate CMV scope ↗
What is the federal minimum major-groove tread depth for the front tires of an interstate truck?
Correct answer: 4/32 inch
Measure in a major groove, not at tie bars, humps or fillets; front truck tires require at least 4/32 inch.
Source: 49 CFR 393.75(b); interstate CMV scope ↗
For an interstate truck's rear tires, what is the federal minimum major-groove tread depth?
Correct answer: 2/32 inch
The general non-front-position minimum is 2/32 inch, measured away from tie bars, humps and fillets.
Source: 49 CFR 393.75(c), contrasted with (b); interstate CMV scope ↗
Which tires may not be fitted to the front wheels of an interstate commercial bus?
Correct answer: Regrooved, recapped or retreaded tires
The federal front-wheel prohibition specifically applies to buses and these three tire categories.
Source: 49 CFR 393.75(d); interstate CMV scope ↗
An interstate truck tire's cold pressure is below that specified for its load. What must happen before operation on that tire?
Correct answer: Correct the underinflation for the load
Federal rules prohibit operation with cold tire pressure below that specified for the carried load.
Source: 49 CFR 393.75(i)(1); interstate CMV scope ↗
An interstate truck is not carrying hazardous materials and is not in a driveaway-towaway operation. Which extinguisher option meets the federal minimum rating?
Correct answer: One rated at least 5 B:C
One 5 B:C extinguisher or two extinguishers each rated at least 4 B:C meet the stated non-hazmat rating option.
Source: 49 CFR 393.95 opening scope; (a)(1)(ii),(a)(6); interstate CMV scope ↗
An interstate power unit carries hazardous materials in a quantity requiring placards. What is its federal minimum extinguisher rating?
Correct answer: 10 B:C
A power unit transporting placardable hazardous materials requires an extinguisher rated at least 10 B:C.
Source: 49 CFR 393.95(a)(1)(i); interstate CMV scope ↗
How must the required extinguisher be carried in an ordinary interstate commercial truck?
Correct answer: Readily accessible and securely mounted
It must be filled, accessible, and mounted against sliding, rolling or vertical movement.
Source: 49 CFR 393.95(a)(4); interstate CMV scope ↗
