The plunger in a jerk pump is rotated until...

Question 1 / 205eccefa2bacbc34ba4d47867

Question 1 of 205eccefa2bacbc34ba4d47867

The plunger in a jerk pump is rotated until the release port is uncovered. If the port remains uncovered all of the time, which of the listed operations will occur?

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Question 1 of 20

5eccefa2bacbc34ba4d47867

The plunger in a jerk pump is rotated until the release port is uncovered. If the port remains uncovered all of the time, which of the listed operations will occur?

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🔍 Key Concepts

• Jerk-type fuel injection pump operation and purpose of the plunger helix and spill (release) port • How effective stroke (pumping stroke) is controlled by when the spill port is covered vs uncovered • What happens to pressure buildup and fuel delivery if fuel can escape back to the suction side during the entire plunger stroke

💭 Think About

• Visualize the plunger moving up: if the release (spill) port is uncovered the whole time, where can the fuel go as pressure starts to build? • Ask yourself: does injection into the cylinder happen only when fuel pressure reaches nozzle opening pressure, or does it happen any time the plunger moves? • How does keeping the spill port open affect the pump’s ability to build pressure high enough to open the injection nozzle?

✅ Before You Answer

• Be clear on the difference between plunger motion and effective delivery stroke (only the part of the stroke when the spill port is closed counts for delivery). • Confirm what condition is required at the nozzle for fuel to actually spray into the cylinder (minimum opening pressure must be reached). • Check each option against the idea: if pressure never rises above spill port pressure because the port is always open, what physical result follows inside the injector and nozzle?

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Question 1 of 20

The plunger in a jerk pump is rotated until the release port is uncovered. If the port remains uncovered all of the time, which of the listed operations will occur?

No fuel will be delivered.

The maximum effective stroke will be attained.

The fuel delivered to the cylinder will be excessive.

The injection nozzle will overheat and carbonize.

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Question 1 / 205eccefa2bacbc34ba4d47867

Question 1 of 205eccefa2bacbc34ba4d47867

The plunger in a jerk pump is rotated until the release port is uncovered. If the port remains uncovered all of the time, which of the listed operations will occur?

Back

Question 1 of 20

5eccefa2bacbc34ba4d47867

The plunger in a jerk pump is rotated until the release port is uncovered. If the port remains uncovered all of the time, which of the listed operations will occur?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed