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ABYC Diesel Certification 2020
Questions and Correct Answers/ Latest
Update / Already Graded
minimum spacing between hull vent openings and fuel fill or vent
fititngs should be
Ans: 15 inches
thermal efficiency of a diesel engine is such that typical heat
converted to useful power is approximately what percent of total
heat
Ans: 36%
What is the primary difference between the gasoline-fueled and Jen
four stroke cycle and the diesel four-stroke cycle
Ans: The intake stroke only brings air into the cylinder
,2 | Page
Temperature controlled engine room exhaust blowers in a diesel
powered boat are primarily used to
Ans: Lower engine room temperatures
With some diesel engines it is necessary to use what when cold
starting
Ans: Heat
When setting up a piping system for exhaust gases the number of
sharp bins should be kept to a minimum to
Ans: Prevent excessive exhaust back-pressure
Who does not have requirements that apply to exhaust components
and hose types
Ans: U.s. coast guard
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What is the most likely exhaust related cause for excessive engine
operating temperature
Ans: Exhaust elbows that are old and clogged
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
Ans: Siphon break
Upon inspection of the wet exhaust system the technician 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?
Ans: Tech b
If you do not refill the raw water system with a winterizing solution for
long-term storage after draining the sea water the system is prone to
ABYC Diesel Certification 2020
Questions and Correct Answers/ Latest
Update / Already Graded
minimum spacing between hull vent openings and fuel fill or vent
fititngs should be
Ans: 15 inches
thermal efficiency of a diesel engine is such that typical heat
converted to useful power is approximately what percent of total
heat
Ans: 36%
What is the primary difference between the gasoline-fueled and Jen
four stroke cycle and the diesel four-stroke cycle
Ans: The intake stroke only brings air into the cylinder
,2 | Page
Temperature controlled engine room exhaust blowers in a diesel
powered boat are primarily used to
Ans: Lower engine room temperatures
With some diesel engines it is necessary to use what when cold
starting
Ans: Heat
When setting up a piping system for exhaust gases the number of
sharp bins should be kept to a minimum to
Ans: Prevent excessive exhaust back-pressure
Who does not have requirements that apply to exhaust components
and hose types
Ans: U.s. coast guard
, 3 | Page
What is the most likely exhaust related cause for excessive engine
operating temperature
Ans: Exhaust elbows that are old and clogged
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
Ans: Siphon break
Upon inspection of the wet exhaust system the technician 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?
Ans: Tech b
If you do not refill the raw water system with a winterizing solution for
long-term storage after draining the sea water the system is prone to
