ABYC Diesel Engine Certification
Study online at https://quizlet.com/_bhk0pt
1. B. 15 inches Based on ABYC standards, minimum spacing between hull vent openings and fuel
fill or vent fittings should be:
A. 9 inches
B. 15 inches
C. 24 inches
D. 36 inches
2. D. 36% The thermal efficiency of a diesel engine is such that typical heat converted to useful
power is approximately _______% of the total heat
A. 22
B. 45
C. 15
D. 36
3. A. The diesel in- One of the primary differences between the gasoline engine four stroke cycle and
take stroke only the diesel four-stroke cycle is:
brings air into the
cylinder A. The diesel 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
4. C. Lower engine Temperature controlled engine room exhaust blowers in diesel powered boat are
room tempera- primarily used to:
ture.
A. heat the boats cabin
B. ventilate the boats fire suppression system
C. lower engine room temperature
D. reduce exhaust back pressure
, ABYC Diesel Engine Certification
Study online at https://quizlet.com/_bhk0pt
5. B. Heat With some diesels there may be a need to ________ incoming air to the combus-
tion chambers to assist in cold starting
A. Pressurize
B. heat
C. humidify
D. atomize
6. D. Prevent exces- In setting up a piping system for exhaust gases, the number of sharp bends should
sive back pres- be kept to a minimum to
sure
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
7. D. US Coast Which of the following does not have requirements that apply to exhaust compo-
Guard nents and hose types?
A. UL 1129
B. SAE J2006
C. ABYC P-1
D. US Coast Guard
8. A. Exhaust el- Which of the following is the most likely exhaust related cause for excessive engine
bows that are old operating temperature?
and clogged
A. exhaust elbows that are old and clogged
B. delaminated exhaust hose
C. oversized exhaust system
D. underwater exhaust outlet
9. C. Siphon break
, ABYC Diesel Engine Certification
Study online at https://quizlet.com/_bhk0pt
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
10. B. Tech B Upon inspection of the wet exhaust system. the tech notices that the exhaust hose is
burned near the elbow. Tech A says that replacing the hose will correct the problem.
Tech B says that the problem is most likely with the cooling system. Which tech is
correct?
A. Tech A
B. Tech B
C. Both Techs are correct
D. Neither Tech is correct
11. A. Oxidation If you do not refill the raw water system with a winterizing solution for long-term
storage after draining the seawater, the system is prone to:
A. oxidation
B. freezing
C. overheating
D. A and C
12. C. Check- Replacement of a failed seawater pump impeller should normally include:
ing downstream
components for A. draining water lift muffler
impeller pieces B. flushing heat exchanger
C. checking all downstream components for impeller pieces
D. replacing zinc anodes
Study online at https://quizlet.com/_bhk0pt
1. B. 15 inches Based on ABYC standards, minimum spacing between hull vent openings and fuel
fill or vent fittings should be:
A. 9 inches
B. 15 inches
C. 24 inches
D. 36 inches
2. D. 36% The thermal efficiency of a diesel engine is such that typical heat converted to useful
power is approximately _______% of the total heat
A. 22
B. 45
C. 15
D. 36
3. A. The diesel in- One of the primary differences between the gasoline engine four stroke cycle and
take stroke only the diesel four-stroke cycle is:
brings air into the
cylinder A. The diesel 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
4. C. Lower engine Temperature controlled engine room exhaust blowers in diesel powered boat are
room tempera- primarily used to:
ture.
A. heat the boats cabin
B. ventilate the boats fire suppression system
C. lower engine room temperature
D. reduce exhaust back pressure
, ABYC Diesel Engine Certification
Study online at https://quizlet.com/_bhk0pt
5. B. Heat With some diesels there may be a need to ________ incoming air to the combus-
tion chambers to assist in cold starting
A. Pressurize
B. heat
C. humidify
D. atomize
6. D. Prevent exces- In setting up a piping system for exhaust gases, the number of sharp bends should
sive back pres- be kept to a minimum to
sure
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
7. D. US Coast Which of the following does not have requirements that apply to exhaust compo-
Guard nents and hose types?
A. UL 1129
B. SAE J2006
C. ABYC P-1
D. US Coast Guard
8. A. Exhaust el- Which of the following is the most likely exhaust related cause for excessive engine
bows that are old operating temperature?
and clogged
A. exhaust elbows that are old and clogged
B. delaminated exhaust hose
C. oversized exhaust system
D. underwater exhaust outlet
9. C. Siphon break
, ABYC Diesel Engine Certification
Study online at https://quizlet.com/_bhk0pt
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
10. B. Tech B Upon inspection of the wet exhaust system. the tech notices that the exhaust hose is
burned near the elbow. Tech A says that replacing the hose will correct the problem.
Tech B says that the problem is most likely with the cooling system. Which tech is
correct?
A. Tech A
B. Tech B
C. Both Techs are correct
D. Neither Tech is correct
11. A. Oxidation If you do not refill the raw water system with a winterizing solution for long-term
storage after draining the seawater, the system is prone to:
A. oxidation
B. freezing
C. overheating
D. A and C
12. C. Check- Replacement of a failed seawater pump impeller should normally include:
ing downstream
components for A. draining water lift muffler
impeller pieces B. flushing heat exchanger
C. checking all downstream components for impeller pieces
D. replacing zinc anodes
