Cargo Tank Specifications, Classification & Testing Practice Test, Test 3 of 3

Wrong. Tank color has no bearing on this requirement. The trigger is the combination of an unlined interior and a corrosive product, not paint or markings.

The correct answer is A: Because corrosive cargo attacks the tank wall from the inside, where thinning isn't visible from an outside walk-around.

49 CFR 180.407(i)(1)

Wrong. Visual inspections are separately required under 180.407(d) and (e) and are later marked with their own codes (V for external, I for internal) under 180.415; thickness testing is an additional, different check required by 180.407(i), not a replacement for visual inspection.

The correct answer is A: Because corrosive cargo attacks the tank wall from the inside, where thinning isn't visible from an outside walk-around.

49 CFR 180.407(i)(1)

Wrong. Cost is not the regulatory rationale. Thickness testing requires specialized measurement (such as ultrasonic gauging) specifically because it detects a hazard a visual check cannot: internal wall thinning.

The correct answer is A: Because corrosive cargo attacks the tank wall from the inside, where thinning isn't visible from an outside walk-around.

49 CFR 180.407(i)(1)