How does a ship's main engine governor regulate engine speed?

How does a ship's main engine governor regulate engine speed?

• A. It senses actual speed and adjusts fuel supply to the injectors to maintain the preset rpm.
• B. It senses actual speed and adjusts the coolant flow to maintain rpm.
• C. It monitors exhaust temperature to limit RPM.
• D. It uses manual throttle adjustments only.

Answer: (C)

The main idea is that the governor keeps the engine at a set speed by feeding exactly the right amount of fuel. It measures how fast the engine is actually turning and compares that to the desired RPM. If the speed is too high, the governor reduces fuel to the injectors (via the fuel rack or injection system) to slow it down; if the speed is too low, it increases fuel to raise the speed. This continuous feedback stabilizes the RPM at the preset value. Cooling system flow and exhaust temperature are not used for normal speed control—the coolant flow handles cooling, while exhaust temperature sensors act as a safety limit to protect the engine. Manual throttling isn’t required once the governor is in place.

The main idea is that the governor keeps the engine at a set speed by feeding exactly the right amount of fuel. It measures how fast the engine is actually turning and compares that to the desired RPM. If the speed is too high, the governor reduces fuel to the injectors (via the fuel rack or injection system) to slow it down; if the speed is too low, it increases fuel to raise the speed. This continuous feedback stabilizes the RPM at the preset value. Cooling system flow and exhaust temperature are not used for normal speed control—the coolant flow handles cooling, while exhaust temperature sensors act as a safety limit to protect the engine. Manual throttling isn’t required once the governor is in place.