When preparing to change the oil of the speed control governor of one of the main propulsion engines on your towboat, you should consult the governor instruction manual to determine the proper viscosity of the oil to use. What is the primary factor that will determine the recommended viscosity?
• How oil viscosity changes with temperature in mechanical systems • What part of a governor’s operation is most affected by oil thickness (damping, movement of parts, response time) • Difference between engine characteristics and the governor’s own internal operating conditions
• Ask yourself: Which factor directly affects how thick or thin the oil actually is inside the governor while it is running? • Which choice describes something that changes the oil’s behavior (flow, lubrication, damping) rather than just how much power or speed the engine can make? • Is the governor oil chosen mainly to match engine horsepower/speed range, or to make sure the governor’s internal moving parts can move smoothly and consistently under normal working conditions?
• Identify which answer choice refers to the governor’s own working environment, not just the engine’s rating data. • Consider how oil charts are usually written (viscosity vs. temperature range). • Verify which factor would a manufacturer most likely use to decide what oil grade to list in the governor’s instruction manual.
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