Final answer:
The most basic question to ask before performing a site survey at a customer's facility is about the preferred date and time for the visit, which helps in scheduling and ensures convenience.
Step-by-step explanation:
Before visiting a customer's facility to perform a site survey, the most basic question to ask is: "What is the preferred date and time for the site survey?" This question ensures that the visit is scheduled at a convenient time for the customer and that the necessary preparations can be made. Additionally, it is important to inquire about any specific requirements or access restrictions for the site.
Furthermore, other key questions might include asking about the company's decision-making timeline, how they will contact you after the survey, and if the interviewer has any follow-up questions. These questions help in planning and follow-up communication.