Question 80Gas Turbine - 1st Asst/Chief

70% to pass

When performing a static check to determine tooth contact, you should use which of the following compounds to coat the gear teeth?

ACopper sulfate.
BAn indelible marker.
CPrussian Blue.
DPersian Blue.
AI Explanation

The correct answer is C) Prussian Blue. When performing a static check to determine tooth contact on gear teeth, Prussian Blue is the recommended compound to use. Prussian Blue is a dark blue pigment that will leave a visible imprint on the gear teeth, allowing you to inspect the contact pattern and ensure proper tooth engagement. This is a standard practice specified in the regulations and guidelines for inspecting gear systems. The other options are not the correct compounds for this purpose. Copper sulfate and Persian Blue are not typically used for gear tooth contact inspection, and an indelible marker would not provide the same clear, controlled imprint as a specialized pigment like Prussian Blue.

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Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
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