Millwright Level 1 Practice Exam

What is a vernier scale designed to do?

1. Compare weights of objects

2. Compare 2 sets of graduations to magnify the accuracy of the measurement

3. Measure angles accurately

4. Determine length and width of objects

The correct answer is: Compare 2 sets of graduations to magnify the accuracy of the measurement

A vernier scale is specifically designed to enhance the precision of measurements by allowing the user to compare two sets of graduations. This tool consists of a main scale with traditional graduations and a sliding scale, known as the vernier scale, which has smaller divisions. When an object is measured, the alignment of the scales provides a reading that is more precise than what could be achieved by just using the main scale alone. The vernier scale works by using the difference between the two scales to determine measurements with a higher degree of accuracy. For example, if the main scale shows a measurement of 5 units and the vernier scale indicates an additional 0.2 units, the final reading would be 5.2 units. This ability to provide refined measurements is what makes the vernier scale invaluable in fields that require meticulous attention to detail, such as machining, engineering, and manufacturing. In contrast, the other options do not accurately reflect the primary function of the vernier scale. Comparing weights is unrelated to measurement, though scales or balances are used for that purpose. Measuring angles accurately is typically done with tools such as protractors. Determining length and width can be achieved with conventional rulers, but they do not offer the same enhanced accuracy