Elevator Mechanic Practice Exam

What are extension tubes used for?

1. Creating additional space for maintenance

2. Increase the capacity of the hoist

3. Necessary clearance for placement of concrete forms

4. Providing access to the control box

The correct answer is: Necessary clearance for placement of concrete forms

Extension tubes are utilized primarily for creating necessary clearance for the placement of concrete forms during the construction or installation of elevator shafts. These tubes help ensure that there is adequate space for the forms that will mold the concrete, allowing for proper structural integrity and alignment. This is critical in elevator construction, as it affects both safety and functionality. While the other options may seem relevant to elevator maintenance or operation, they do not specifically align with the primary purpose of extension tubes in the context given. For instance, creating additional space for maintenance or increasing the capacity of the hoist does not inherently relate to the need for anything associated with concrete forms. Accessing the control box also typically involves different structural considerations that do not necessitate the use of extension tubes. Thus, the focus on clearance for forms is the key reason extension tubes are used in this context.