Question 160Motor Plants - QMED

The correct answer is C) HFO/DO fuel changeover valve for main engine. The valve labeled "1" in the illustration MO-0077 is used to switch the fuel supply between Heavy Fuel Oil (HFO) and Diesel Oil (DO) for the main engine. This allows the engine to operate on either HFO or DO, depending on the fuel availability and operational requirements. The changeover valve ensures a smooth transition between the two fuel types, which is necessary for the proper functioning and efficiency of the main engine. The other options are incorrect because they do not accurately describe the purpose of the valve labeled "1". Option A refers to a fuel mixing valve, while option B and D describe changeover valves for the auxiliary engines and boiler, which are separate from the main engine fuel system.