ABYC MARINE CERTIFICATION EXAM |ACTUAL QUESTIONS AND VERIFIED ANSWERS|BRAND NEW UPDATE|GRADED A+

ABYC MARINE CERTIFICATION EXAM |ACTUAL
QUESTIONS AND VERIFIED ANSWERS|BRAND NEW
2026-2027 UPDATE|GRADED A+


Question 1

A sailboat's rigging is considered a reliable path to ground for lightning? T/F?

CORRECT ANSWER

FALSE. End fittings introduce the possibility of high resistance. TE-4, Conductors




Question 2

Gasoline engines use what kind of ignition?

CORRECT ANSWER

Spark igntion Diesel Study Guide, Chapter 1




Question 3

Diesel engines use what kind of ignition?

CORRECT ANSWER

Compression ignition Diesel Study Guide, Chapter 1




Question 4

Spark ignition are what kind of engines?

CORRECT ANSWER

Gasoline engines Diesel Study Guide, Chapter 1



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,Question 5

Compression ignition are what kind of engines?

CORRECT ANSWER

Diesel engines Diesel Study Guide, Chapter 1




Question 6

How hot must a atomized diesel get before combustion?
CORRECT ANSWER

750 degrees or more Diesel Study Guide, Chapter 1




Question 7

Cooler air is denser than ambient temperature? T/F?

CORRECT ANSWER

TRUE, denser air has more oxygen molecules per cubic foot Diesel Study Guide, Chapter 1




Question 8

"One of the primary differences between the gasoline-fueled engine four-stroke cycle and
the diesel four-stroke cycle is:

A. The intake stroke only brings air into the cylinder.

B. The compression ratio of the diesel engine is much lower than the same sized gasoline
engine.

C. Fuel gets atomized by the high heat with a diesel engine.

D. The diesel fuel is more volatile than the gasoline."
CORRECT ANSWER

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, A. The intake stroke only brings air into the cylinder. Diesel Study Guide, Chapter 1




Question 9

What is the tool to check engine back-pressure?

CORRECT ANSWER

Manometer Diesel Study Guide, Chapter 2




Question 10

When checking engine back-pressure, the engine must be under load to get a valid
reading. T/F?

CORRECT ANSWER

TRUE Diesel Study Guide, Chapter 2




Question 11

"When choosing materials, we want them to be as close as possible on the Galvanic
Series. What is the recommended separation of corrosion potential?

A. 200V

B. 2000mV

C. 200mV

D. 2V"

CORRECT ANSWER

C. 200mV Diesel Study Guide, Chapter 2, pg 23




Question 12

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, "In setting up a piping system for exhaust gases, the number of sharp bends should be
kept to a minimum to:

A. raise exhaust gas temperature.

B. permit use of a larger diameter pipe.

C. eliminate the need for a silencer.

D. prevent excessive exhaust back-pressure."

CORRECT ANSWER

D. prevent excessive exhaust back-pressure. Diesel Study Guide, Chapter 2




Question 13

"An engine equipped with an exhaust-mixing elbow is installed below the waterline. What
device must be installed in the raw water discharge hose ahead of the mixing elbow?

A. Manometer.

B. Flow diverter.

C. Siphon break.

D. Flapper valve."

CORRECT ANSWER

C. Siphon break. Diesel Study Guide, Chapter 2




Question 14

"Upon inspection of the wet exhaust system, the technician notices that the exhaust hose
is burned near the elbow. Technician A says that replacing the hose will correct the
problem. Technician B says that the problem is most likely with the cooling system. Which
technician is correct?

A. Technician A.

B. Technician B.

C. Both technicians are correct.


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