The oil spill response vessel to which you...

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Question 1 of 2066636eef28f7522a1c51ffe0

The oil spill response vessel to which you are assigned has diesel generators fitted with multi-plunger pumps with the metering principle as shown in the illustration. What statement is true concerning this injection pump type? Illustration MO-0145

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Question 1 of 20

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🔍 Key Concepts

• Port-and-helix fuel injection pump operation shown in Part A (vertical plunger travel) • How plunger rotation and rack movement in Part B change the effective stroke • Relationship between effective stroke vs. total stroke and when the spill port is uncovered

💭 Think About

• Look at the sequence in Part A: at which plunger position does injection always BEGIN, and is that position affected by the rack in Part B? • In Part B, when the rack moves and rotates the plunger, what changes: the point where the intake port is closed, or the point where the spill port/helix uncovers again? • If engine load is increased (more fuel required), does the pump deliver fuel for a longer or shorter portion of the plunger’s upward stroke?

✅ Before You Answer

• Identify on the diagram where delivery valve opens / injection begins and see if this point moves when the rack changes position. • Identify where injection ends (helix uncovers spill port) and see how that point shifts with plunger rotation in Part B. • Confirm which part of the stroke is labeled effective stroke and how that corresponds to the different rack positions (0, 0.5, 1).

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