For the green aspect to be illuminated, which relays must be energized?

For the green aspect to be illuminated, which relays must be energized?

• A. H and V in the clear
• B. HV energized and DV energized
• C. HV de-energized
• D. V in danger and HV de-energized

Answer: (B)

In signaling systems, relays play a crucial role in determining which aspects of the signal are illuminated based on the conditions of the track ahead. For the green aspect to be activated, certain relays must be in energized states to ensure that the signal is safe for train movement. The correct answer indicates that both the HV relay (which often represents high voltage or primary signaling) and the DV relay (which might indicate a specific condition allowing for a green aspect) must be energized. This ensures that all safety checks and operational conditions are met to permit safe operation. When both of these relays are energized, it signifies that the track is clear ahead and that it is safe for trains to proceed, thus illuminating the green signal aspect. This reflects a functional hierarchy in signaling systems, where certain indicators must be activated to validate the next signal's display, ensuring the safe and efficient management of rail traffic. In contrast, the other options provide either conditions that do not satisfy the requirements for illuminating the green aspect or suggest the need for de-energizing certain relays, which would not allow for the green aspect to be active. Therefore, energizing both the HV and DV relays is essential for the correct operation of the signaling system, ensuring that safety

In signaling systems, relays play a crucial role in determining which aspects of the signal are illuminated based on the conditions of the track ahead. For the green aspect to be activated, certain relays must be in energized states to ensure that the signal is safe for train movement.

The correct answer indicates that both the HV relay (which often represents high voltage or primary signaling) and the DV relay (which might indicate a specific condition allowing for a green aspect) must be energized. This ensures that all safety checks and operational conditions are met to permit safe operation.

When both of these relays are energized, it signifies that the track is clear ahead and that it is safe for trains to proceed, thus illuminating the green signal aspect. This reflects a functional hierarchy in signaling systems, where certain indicators must be activated to validate the next signal's display, ensuring the safe and efficient management of rail traffic.

In contrast, the other options provide either conditions that do not satisfy the requirements for illuminating the green aspect or suggest the need for de-energizing certain relays, which would not allow for the green aspect to be active. Therefore, energizing both the HV and DV relays is essential for the correct operation of the signaling system, ensuring that safety