Question 109Motor Plants - 1st Asst/Chief
70% to passWhen changing over from residual to distillate fuel on a slow-speed diesel main engine, what is a good guideline to follow regarding the change over?
AChange over time should not be less than six hours.
BRate of temperature change of fuel to the engine should not exceed 2 degrees C per minute.
CChange over should be accomplished as quickly as possible as dictated by engine load.
DChange over time should not exceed two hours.
AI Explanation
The correct answer is B) Rate of temperature change of fuel to the engine should not exceed 2 degrees C per minute. This is the correct answer because a sudden change in fuel temperature can cause thermal shock and damage to the engine components. Slowly transitioning the fuel temperature ensures a gradual change that the engine can accommodate without issue. Changing over too quickly, as in option C, can lead to engine problems. Options A and D prescribe arbitrary time limits that may not be appropriate for all engine configurations and loads.
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