If there are no more calls at all, what does the elevator do?

If there are no more calls at all, what does the elevator do?

• A. Stop and become idle
• B. Move to top floor
• C. Open doors indefinitely
• D. Return to ground floor automatically

Answer: (A)

When there are no pending requests, the elevator should stop and enter an idle state. With no calls to service, there’s no instruction to move, so continuing to run would waste energy and cause unnecessary wear. Entering idle keeps the system ready to respond instantly as soon as a new call appears, while conserving power and reducing motion. Moving to the top floor would be pointless without a request to go there. Opening the doors indefinitely would waste energy and disrupt building flow. Returning to the ground floor automatically is only a special behavior in some systems and isn’t implied by having no calls.

When there are no pending requests, the elevator should stop and enter an idle state. With no calls to service, there’s no instruction to move, so continuing to run would waste energy and cause unnecessary wear. Entering idle keeps the system ready to respond instantly as soon as a new call appears, while conserving power and reducing motion.

Moving to the top floor would be pointless without a request to go there. Opening the doors indefinitely would waste energy and disrupt building flow. Returning to the ground floor automatically is only a special behavior in some systems and isn’t implied by having no calls.