Millwright Level 1 Practice Exam

What is the level of accuracy for a vernier micrometer scale?

1. 0.001"

2. 0.0001"

3. 0.1"

4. 1"

The correct answer is: 0.0001"

The level of accuracy for a vernier micrometer scale is 0.0001". This precision is a result of the design and construction of the micrometer, which allows for very fine measurements. The vernier scale is paired with a rotating spindle that provides a linear movement of the measuring surface as it is turned. This enables the user to achieve measurements with significant resolution—the difference between each increment is small enough to allow readings that are accurate to one ten-thousandth of an inch. This level of accuracy is critical in machining and manufacturing processes where very precise measurements are necessary to ensure proper fit and function of parts, and it is particularly valued in settings where tight tolerances are standard. Other choices reflect levels of precision that are not achievable with vernier micrometers.