Answer :
Final answer:
The correct option is b. Dial bore gauge. A dial bore gauge requires an initial setup or adjustment to a fixed dimension before use, unlike other measuring tools like vernier calipers or dial indicator micrometers.
Explanation:
The correct option is b. Dial bore gauge. The measuring gauge that needs to be set up or adjusted to a fixed dimension before use is a dial bore gauge. Dial bore gauges are precision instruments used to measure the internal diameters of cylinders or holes, and they must be calibrated to a reference measurement before use. This is done by setting the gauge to a known size using a setting ring or micrometer.
The operator will then lock this setting into the gauge as a reference point for measuring the bore of an engine cylinder, for example. Unlike a vernier caliper or a dial indicator micrometer, which can be used directly to measure distances and diameters, a dial bore gauge requires this initial setup step to ensure accuracy.
