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In a system with states idle, moving up, and moving down, what does the idle state indicate about the system's activity?

easy🧠 Conceptual Q1 of Q15
LLD - Design — Elevator System
In a system with states idle, moving up, and moving down, what does the idle state indicate about the system's activity?
AThe system is in an error state
BThe system is currently moving upwards
CThe system is processing a command to move down
DThe system is not performing any movement or action
Step-by-Step Solution
Solution:

  1. Step 1: Understand the meaning of states

    The idle state typically means the system is inactive or waiting.

  2. Step 2: Compare with other states

    moving up and moving down indicate active movement, so idle must mean no movement.

  3. Final Answer:

    The system is not performing any movement or action -> Option D

  4. Quick Check:

    Idle means no action or movement [OK]
Quick Trick: Idle means no movement or action [OK]
Common Mistakes:
MISTAKES
  • Confusing idle with a transitional or error state
  • Assuming idle means the system is processing commands

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