Question 420Motor Plants - Assistant Engineer70% to pass
When running a large, dual fuel, main propulsion diesel engine on heavy fuel, which of the following precautions should be observed when switching from heavy fuel oil to diesel oil?
AI Explanation
The correct answer is A) The temperature of the fuel from the preheater should be gradually reduced after switching over the three-way valve.
This is the correct answer because when switching from heavy fuel oil to diesel oil, the temperature of the fuel needs to be gradually reduced to prevent thermal shock and damage to the engine components. Heavy fuel oil requires higher temperatures to maintain its viscosity, while diesel oil can operate at lower temperatures. Reducing the temperature gradually allows the engine systems to adapt to the change in fuel properties.
The other options are incorrect because B) mixing heavy fuel and diesel oil is not recommended, C) increasing the heating steam would be counterproductive, and D) securing the heating steam before the switch would result in the fuel cooling too quickly, which could also damage the engine.
Related Questions
#418 After following the prescribed procedures to measure the thrust bearing clearance shown in the illustration, the distance "F" is determined to be 200 mm, and 'f1' is 2.3 mm. Which of the following statements describes the condition indicated by these dimensions? Illustration MO-0121 #419 The spray holes in diesel engine fuel valves should be cleaned using carbon solvent and_______________. #421 Air is normally bled from a diesel engine fuel system by _______________. #422 Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires_______________. #423 When a nozzle tester is being used to test a "closed" type fuel injection nozzle, a clogged nozzle orifice will be indicated by a_______________.