The mollusc dredger to which you are...

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Question 1 of 2066636eef28f7522a1c51ff3b

The mollusc dredger to which you are assigned has a deck winch drive engine fitted with fuel injectors with the operating principle as shown in the illustration. In figure "A" which plunger travel position corresponds to when fuel injection begins? Illustration MO-0144

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🔍 Key Concepts

• Fuel injection begins only when spill/return ports are fully closed and pressure can build to nozzle-opening pressure • How the recessed area on the plunger lines up with the upper and lower ports during downward travel in Figure A • Difference between filling/recirculating fuel and pressurizing fuel in a plunger‑type injector

💭 Think About

• In each of the four plunger positions in Figure A, ask yourself: are any ports still providing a path for fuel to escape back to the low‑pressure side, or are they all blocked? • At what point in the downward stroke does the plunger first create a sealed chamber between its lower face and the closed ports so that pressure can rise? • Compare the position of the recessed area relative to the upper port and horizontal drilling: when does that connection disappear, and what does that mean for fuel pressure?

✅ Before You Answer

• Identify in which numbered position the upper port and horizontal drilling are no longer exposed to the recessed area on the plunger • Confirm that in this position there is no open route for fuel to spill back, so movement of the plunger must increase pressure in the trapped fuel • Make sure you are looking only at Figure A (vertical travel) and not being distracted by Figure B, which deals with plunger rotation and effective stroke

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