Question 1
On a marine diesel engine, what is the primary purpose of the fuel injection timing?
Correct Answer:
To determine the crank angle at which fuel begins to burn so combustion peaks shortly after top dead center
Question 2
A diesel engine will not start when the starting air valve is opened, although air pressure is normal and the air start distributor appears to function. The most likely cause is that the:
Correct Answer:
Turning gear is still engaged
Question 3
In a four-stroke-cycle diesel engine, how many crankshaft revolutions are required to complete one full cycle of operation in each cylinder?
Correct Answer:
Two revolutions (720 degrees)
Question 4
What is the chief function of the scavenging process in a two-stroke-cycle diesel engine?
Correct Answer:
To remove burned exhaust gases from the cylinder and replace them with fresh air
Question 5
A marine diesel engine governor is best described as a device that:
Correct Answer:
Automatically adjusts fuel rack position to maintain a set engine speed under varying load
Question 1
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About this Exam

Prepare with the DDE Unlimited Practice Questions - USCG Designated Duty Engineer (DDE) Unlimited Horsepower Exam practice quiz. This question bank includes 100 questions covering engine, diesel, fuel, water, and primary. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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DDE Unlimited Practice Questions - USCG Designated Duty Engineer (DDE) Unlimited Horsepower Exam

This practice set contains 100 questions from the matching question bank and focuses on engine, diesel, fuel, water, and primary. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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