SAMS Hull Inspection and Materials 2

Question 1

When inspecting a fiberglass hull, what does a 'thud' sound during sounding indicate compared to a sharp 'click'?

Accepted Answer

Delamination or void within the laminate

Answer

Sound laminate with good resin saturation

Answer

Properly cured gel coat surface

Answer

Adequate core density

Question 2

Which coring material is most resistant to moisture absorption in a sandwich-construction fiberglass hull?

Accepted Answer

Cross-linked PVC foam

Answer

End-grain balsa

Answer

Plywood

Answer

Divinycell H-grade

Question 3

A surveyor observes blistering on a fiberglass hull below the waterline. What is the primary chemical process causing osmotic blisters?

Accepted Answer

Hydrolysis of ester linkages in polyester resin

Answer

Oxidation of the styrene resin

Answer

Galvanic corrosion of embedded hardware

Answer

UV degradation of the gel coat

Question 4

What ASTM standard governs the testing and classification of marine-grade plywood used in hull construction?

Accepted Answer

BS 1088

Answer

ASTM D1761

Answer

ASTM D3043

Answer

APA PS 1-09

Question 5

During a steel hull inspection, what technique is used to measure remaining plate thickness without removing interior linings?

Accepted Answer

Ultrasonic thickness gauging

Answer

Caliper measurement at cut sections

Answer

Magnetic particle testing

Answer

Eddy current testing

Question 6

Which type of aluminum alloy is most commonly specified for recreational boat hull construction due to its corrosion resistance in saltwater?

Accepted Answer

5086 or 5052 series

Answer

2024-T3

Answer

7075-T6

Answer

6061-T6

Question 7

When inspecting a wood hull, which structural member connects the keel to the stem and sternpost, forming the backbone of the vessel?

Accepted Answer

Deadwood

Answer

Keelson

Answer

Garboard strake

Answer

Hog