B. 15 inches - ANSWER 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
D. 36% - ANSWER The thermal efficiency of a diesel engine is such that typical heat converted to useful...
B. 15 inches - ANSWER 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
D. 36% - ANSWER 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
A. The diesel intake stroke only brings air into the cylinder - ANSWER One of the primary differences
between the gasoline engine four stroke cycle and the diesel four-stroke cycle is:
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
,C. Lower engine room temperature. - ANSWER Temperature controlled engine room exhaust blowers in
diesel powered boat are primarily used to:
A. heat the boats cabin
B. ventilate the boats fire suppression system
C. lower engine room temperature
D. reduce exhaust back pressure
B. Heat - ANSWER With some diesels there may be a need to ________ incoming air to the combustion
chambers to assist in cold starting
A. Pressurize
B. heat
C. humidify
D. atomize
D. Prevent excessive back pressure - ANSWER 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
D. US Coast Guard - ANSWER Which of the following does not have requirements that apply to exhaust
components and hose types?
A. UL 1129
B. SAE J2006
C. ABYC P-1
, D. US Coast Guard
A. Exhaust elbows that are old and clogged - ANSWER Which of the following is the most likely exhaust
related cause for excessive engine operating temperature?
A. exhaust elbows that are old and clogged
B. delaminated exhaust hose
C. oversized exhaust system
D. underwater exhaust outlet
C. Siphon break - ANSWER 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
B. Tech B - ANSWER 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
A. Oxidation - ANSWER 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:
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