ABYC Practice Questions
ABYC 2025-2026 Exam Practice Questions
Study online at https://quizlet.com/_4j4uhj
1. FALSE. End fit- A sailboat's rigging is considered a reliable path to ground for lightning? T/F?
tings introduce
the possibility of
high resistance.
TE-4, Conductors
2. Spark igntion Gasoline engines use what kind of ignition?
Diesel Study
Guide, Chapter 1
3. Compression ig- Diesel engines use what kind of ignition?
nition Diesel
Study Guide,
Chapter 1
4. Gasoline engines Spark ignition are what kind of engines?
Diesel Study
Guide, Chapter 1
5. Diesel engines Compression ignition are what kind of engines?
Diesel Study
Guide, Chapter 1
6. 750 degrees How hot must a atomized diesel get before combustion?
or more Diesel
Study Guide,
Chapter 1
7. TRUE, denser Cooler air is denser than ambient temperature? T/F?
air has more
oxygen mole-
cules per cubic
www.stuvia.com
, ABYC Practice Questions
ABYC 2025-2026 Exam Practice Questions
Study online at https://quizlet.com/_4j4uhj
foot Diesel Study
Guide, Chapter 1
8. A. The in- "One of the primary differences between the gasoline-fueled engine four-stroke
take stroke only cycle and the diesel four-stroke cycle is:
brings air into A. The intake stroke only brings air into the cylinder.
the cylinder. B. The compression ratio of the diesel engine is much lower than the same sized
Diesel Study gasoline engine.
Guide, Chapter 1 C. Fuel gets atomized by the high heat with a diesel engine.
D. The diesel fuel is more volatile than the gasoline."
9. Manometer What is the tool to check engine back-pressure?
Diesel Study
Guide, Chapter 2
10. TRUE Diesel When checking engine back-pressure, the engine must be under load to get a
Study Guide, valid reading. T/F?
Chapter 2
11. C. 200mV Diesel "When choosing materials, we want them to be as close as possible on the
Study Guide, Galvanic Series. What is the recommended separation of corrosion potential?
Chapter 2, pg 23 A. 200V
B. 2000mV
C. 200mV
D. 2V"
12. D. prevent ex- "In setting up a piping system for exhaust gases, the number of sharp bends
cessive ex- should be kept to a minimum to:
haust back-pres- A. raise exhaust gas temperature.
sure. Diesel B. permit use of a larger diameter pipe.
Study Guide, C. eliminate the need for a silencer.
Chapter 2 D. prevent excessive exhaust back-pressure."
www.stuvia.com
, ABYC Practice Questions
ABYC 2025-2026 Exam Practice Questions
Study online at https://quizlet.com/_4j4uhj
13. C. Siphon break. "An engine equipped with an exhaust-mixing elbow is installed below the water-
Diesel Study line. What device must be installed in the raw water discharge hose ahead of the
Guide, Chapter 2 mixing elbow?
A. Manometer.
B. Flow diverter.
C. Siphon break.
D. Flapper valve."
14. B. Technician "Upon inspection of the wet exhaust system, the technician notices that the
B. Diesel Study exhaust hose is burned near the elbow. Technician A says that replacing the hose
Guide, Chapter 2 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.
D. Neither technician is correct."
15. A clear hose What is a good trick to see if a seacock is suffering from aeration?
Diesel Study
Guide, Chapter 3
16. B. Milky Diesel "Water in oil will cause the oil to look:
Study Guide, A. Dark black
Chapter 3 B. Milky
C. Translucent
D. Fluffy brown"
17. False. Diesel Always use Teflon tape on the threads of pencil zincs. T/F?
Study Guide,
Chapter 3
18. Hose from the seacock to the sea strainer should be ____ ________.
www.stuvia.com
ABYC 2025-2026 Exam Practice Questions
Study online at https://quizlet.com/_4j4uhj
1. FALSE. End fit- A sailboat's rigging is considered a reliable path to ground for lightning? T/F?
tings introduce
the possibility of
high resistance.
TE-4, Conductors
2. Spark igntion Gasoline engines use what kind of ignition?
Diesel Study
Guide, Chapter 1
3. Compression ig- Diesel engines use what kind of ignition?
nition Diesel
Study Guide,
Chapter 1
4. Gasoline engines Spark ignition are what kind of engines?
Diesel Study
Guide, Chapter 1
5. Diesel engines Compression ignition are what kind of engines?
Diesel Study
Guide, Chapter 1
6. 750 degrees How hot must a atomized diesel get before combustion?
or more Diesel
Study Guide,
Chapter 1
7. TRUE, denser Cooler air is denser than ambient temperature? T/F?
air has more
oxygen mole-
cules per cubic
www.stuvia.com
, ABYC Practice Questions
ABYC 2025-2026 Exam Practice Questions
Study online at https://quizlet.com/_4j4uhj
foot Diesel Study
Guide, Chapter 1
8. A. The in- "One of the primary differences between the gasoline-fueled engine four-stroke
take stroke only cycle and the diesel four-stroke cycle is:
brings air into A. The intake stroke only brings air into the cylinder.
the cylinder. B. The compression ratio of the diesel engine is much lower than the same sized
Diesel Study gasoline engine.
Guide, Chapter 1 C. Fuel gets atomized by the high heat with a diesel engine.
D. The diesel fuel is more volatile than the gasoline."
9. Manometer What is the tool to check engine back-pressure?
Diesel Study
Guide, Chapter 2
10. TRUE Diesel When checking engine back-pressure, the engine must be under load to get a
Study Guide, valid reading. T/F?
Chapter 2
11. C. 200mV Diesel "When choosing materials, we want them to be as close as possible on the
Study Guide, Galvanic Series. What is the recommended separation of corrosion potential?
Chapter 2, pg 23 A. 200V
B. 2000mV
C. 200mV
D. 2V"
12. D. prevent ex- "In setting up a piping system for exhaust gases, the number of sharp bends
cessive ex- should be kept to a minimum to:
haust back-pres- A. raise exhaust gas temperature.
sure. Diesel B. permit use of a larger diameter pipe.
Study Guide, C. eliminate the need for a silencer.
Chapter 2 D. prevent excessive exhaust back-pressure."
www.stuvia.com
, ABYC Practice Questions
ABYC 2025-2026 Exam Practice Questions
Study online at https://quizlet.com/_4j4uhj
13. C. Siphon break. "An engine equipped with an exhaust-mixing elbow is installed below the water-
Diesel Study line. What device must be installed in the raw water discharge hose ahead of the
Guide, Chapter 2 mixing elbow?
A. Manometer.
B. Flow diverter.
C. Siphon break.
D. Flapper valve."
14. B. Technician "Upon inspection of the wet exhaust system, the technician notices that the
B. Diesel Study exhaust hose is burned near the elbow. Technician A says that replacing the hose
Guide, Chapter 2 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.
D. Neither technician is correct."
15. A clear hose What is a good trick to see if a seacock is suffering from aeration?
Diesel Study
Guide, Chapter 3
16. B. Milky Diesel "Water in oil will cause the oil to look:
Study Guide, A. Dark black
Chapter 3 B. Milky
C. Translucent
D. Fluffy brown"
17. False. Diesel Always use Teflon tape on the threads of pencil zincs. T/F?
Study Guide,
Chapter 3
18. Hose from the seacock to the sea strainer should be ____ ________.
www.stuvia.com
