Answer :
Final answer:
A dial indicator is used to perform a preliminary alignment, which is different from tools like feeler gauges or torque wrenches that have distinct applications. Therefore, the correct answer is a. Feeler gauges.
Explanation:
The tool used to perform a preliminary alignment is a dial indicator. Dial indicators are precise measuring devices that can gauge small amounts of movement and are commonly used in the alignment of machinery components to ensure accuracy and to prevent wear or failure.
They are not to be confused with other tools such as feeler gauges, which are used to measure gap widths, or torque wrenches, which are used to apply a specific torque to a nut or bolt, as described in Figure 2.31, where a wrench provides grip and mechanical advantage to either loosen (turn counterclockwise) or tighten (turn clockwise) a nut.
The tool used to perform a preliminary alignment is dial indicators. Dial indicators are mechanical instruments that measure the distance between two points and are commonly used in various engineering applications to align machine parts or components.
