Dimensional Metrology Fundamentals Quiz

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1. 1

   The arrow indicates the smaller upper jaws of the vernier caliper. What are these jaws designed to measure?

   

   A Internal dimensions, such as a hole diameter B External dimensions, such as shaft thickness C The depth of a blind hole
2. 2

   What is the typical resolution of a conventional metric outside micrometer whose thimble has 50 divisions and advances 0.5 mm per revolution?

   A 0.001 mm B 0.01 mm C 0.1 mm
3. 3

   The target diagram shows five measurements grouped closely together but away from the true central value. How should these results be described?

   

   A High accuracy and low precision B High accuracy and high precision C Low accuracy and high precision
4. 4

   A caliper reads +0.04 mm when its jaws are fully closed. If it displays 12.36 mm on a component, what is the corrected dimension?

   A 12.32 mm B 12.36 mm C 12.40 mm
5. 5

   During inspection of a hole, the GO end of a plug gauge enters completely, while the NO-GO end does not enter. What does this indicate?

   

   A The hole is undersized and must be rejected B The hole is within its specified size limits C The hole is oversized and must be rejected
6. 6

   What is the primary purpose of calibrating a dimensional measuring instrument?

   A To eliminate every possible source of measurement uncertainty B To increase the instrument's physical measuring range C To compare its indications with traceable reference standards
7. 7

   Why are precision gauge blocks gently slid together in a process called wringing?

   A To make their faces adhere and form an accurate combined length B To permanently weld the blocks into a single standard C To remove material until both blocks have equal lengths
8. 8

   How does a mechanical comparator normally determine the size of a component?

   A By directly displaying the component's absolute size from zero B By indicating its deviation from a reference dimension C By checking only whether its surface is visually damaged
9. 9

   A 100.000 mm steel reference expands from 20°C to 40°C. If its thermal expansion coefficient is 12 × 10⁻⁶ per °C, approximately how much does its length increase?

   

   A 0.0024 mm B 0.012 mm C 0.024 mm
10. 10

    What is the main metrological function of the granite surface plate shown supporting the inspection setup?

    

    A To provide a stable, flat reference datum B To magnify movement inside the dial indicator C To heat the component to its operating temperature
11. 11

    Two independent standard uncertainty components are 0.003 mm and 0.004 mm. Using the root-sum-square method, what is their combined standard uncertainty?

    A 0.001 mm B 0.005 mm C 0.007 mm