Visual Testing (VT) Practice Exam

What is the most accurate tool to measure the diameter of a 76 mm (3 in) stud?

1. 51-76 mm (2-3 in.) inside mechanical gage (micrometer).

2. Outside caliper.

3. 152 mm (6 in.) dial caliper.

4. Mechanical (micrometer) depth gage.

The correct answer is: 152 mm (6 in.) dial caliper.

Choosing the dial caliper as the most accurate tool for measuring the diameter of a 76 mm stud is a sound decision based on several key factors. Dial calipers are designed to measure both internal and external dimensions, as well as depths, providing versatility in measurement applications. The 152 mm (6 in.) dial caliper has an ample range to measure a diameter of 76 mm comfortably, and it features a finely graduated scale, allowing for precise reading of measurements. Its design enables users to achieve good accuracy since it can measure increments typically down to 0.01 mm or better, depending on the model. Additionally, dial calipers are user-friendly and offer a visual representation through the dial, which can help in quickly assessing measurements without the challenge of aligning smaller scales, often found with other measuring tools like micrometers. In summary, the combination of range, precision, and ease of use makes the dial caliper the most suitable choice for measuring the diameter of a 76 mm stud effectively.