Question

aviation tools. question 2 of 38
what precision measuring tool is used for measuring crankpin and main bearing journals for out - of - round wear?
a dial gauge.
b micrometer caliper.
c depth gauge.

Explanation:

A dial gauge can be used to measure out - of - round wear on crankpin and main bearing journals by indicating variations in diameter. A micrometer caliper is more for measuring precise diameters at a single point, not specifically out - of - round wear. A depth gauge is for measuring depths, not relevant here.

Answer:

A. Dial gauge.