UPPSC State Engg. A.E. 2011
⭕ A. 5.5 m
⭕ B. 6.5 m
⭕ C. 7.5 m
⭕ D. 8.5 m
📚 Explanation:
A semaphore signal is a traditional railway signal consisting of a movable arm mounted on a vertical post.
🔹 The standard height of a semaphore signal from ground level is 7.5 metres.
🔹 This height ensures proper visibility for train drivers approaching from a distance.
Why 7.5 m?
It provides an optimal elevation for sighting while maintaining structural stability.
A semaphore signal is a traditional railway signal consisting of a movable arm mounted on a vertical post.
🔹 The standard height of a semaphore signal from ground level is 7.5 metres.
🔹 This height ensures proper visibility for train drivers approaching from a distance.
Why 7.5 m?
It provides an optimal elevation for sighting while maintaining structural stability.
👉 Therefore, the correct answer is: C. 7.5 m
Key Points on Semaphore Signals:
- Movable arm system: Standard mechanical signalling device.
- Height = 7.5 m: Ensures visibility from long distances.
- Used in traditional systems: Earlier widely used before colour light signals.
