Question 769 Deck Safety

The correct answer is B) one control. According to the regulations, a fixed carbon dioxide extinguishing system for a machinery space that is designed without a stop valve in the line leading to the protected space must be actuated by a single control. This is because the lack of a stop valve means the system cannot be isolated from the protected space, so it must be designed to discharge the entire contents of the carbon dioxide supply upon actuation. The other answer choices are incorrect because they do not align with the specific requirements for a fixed carbon dioxide system without a stop valve. The system would not require three controls (option A) or two controls (option C), and option D is not correct since the system must be actuated by a single control.