Engine: Expired / General Subjects

1. A Door interlocks are used to prevent elevator operation in a shipboard emergency when elevators are not to be used.
2. B Door interlocks are used to prevent elevator operation if the doors are still open and only allow elevator operation if the doors are proved closed.
3. C Door interlocks are used to prevent elevator operation if the doors are still closed and only allow elevator operation if the doors are proved open.
4. D Door interlocks are used to over-ride elevator emergency status in a shipboard emergency when elevators are required to be used.

Tip: press A-D to answer