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ABYC Diesel Certification Exam Questions
And Answers |Latest 2025 | Guaranteed Pass
Minimum spacing between hull vent openings and fuel fill or vent fititngs should be -
Answer✔15 inches
thermal efficiency of a diesel engine is such that typical heat converted to useful power is
approximately what percent of total heat - Answer✔36%
What is the primary difference between the gasoline-fueled and Jen four stroke cycle and the
diesel four-stroke cycle - Answer✔The intake stroke only brings air into the cylinder
Temperature controlled engine room exhaust blowers in a diesel powered boat are primarily
used to - Answer✔Lower engine room temperatures
With some diesel engines it is necessary to use what when cold starting - Answer✔Heat
When setting up a piping system for exhaust gases the number of sharp bins should be kept to
a minimum to - Answer✔Prevent excessive exhaust back-pressure
Who does not have requirements that apply to exhaust components and hose types -
Answer✔U.s. coast guard
What is the most likely exhaust related cause for excessive engine operating temperature -
Answer✔Exhaust elbows that are old and clogged
1
, ©FYNDLAY 2025 ALL RIGHTS RESERVED 8:29 AM A+
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 - Answer✔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? - Answer✔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 - Answer✔Oxidization
Replacement of a failed sea water pump impeller should normally include - Answer✔Checking
all downstream components for impeller pieces
During a sea trial for a complaint of high-speed overheating the technician finds that the
cooling hoses are swollen and very firm when squeezed and the exhaust hose very hot to the
touch this most likely indicates - Answer✔Exhaust manifold or risers are blocked
Technician a says that you must observe USCG regulations when choosing and installing c Cox.
Tech b says there is no standard for Seahawks or their installation. What tech is correct -
Answer✔Neither tech is correct
during engine operation a technician notices that the water level is low in the sea water strainer
this might indicate which of the following - Answer✔sea water strainer has an air leak and sea
water inlet problems
The most common cause of low coolant temperature in a closed cooling system is - Answer✔A
faulty thermostat
Auxiliary heating devices such as cabin heaters and water heaters may require - Answer✔Using
a restrictor fitting and installing the device lower than the expansion tank
The transfer of heat through the fluid in the cooling system is known as - Answer✔Convection
2
ABYC Diesel Certification Exam Questions
And Answers |Latest 2025 | Guaranteed Pass
Minimum spacing between hull vent openings and fuel fill or vent fititngs should be -
Answer✔15 inches
thermal efficiency of a diesel engine is such that typical heat converted to useful power is
approximately what percent of total heat - Answer✔36%
What is the primary difference between the gasoline-fueled and Jen four stroke cycle and the
diesel four-stroke cycle - Answer✔The intake stroke only brings air into the cylinder
Temperature controlled engine room exhaust blowers in a diesel powered boat are primarily
used to - Answer✔Lower engine room temperatures
With some diesel engines it is necessary to use what when cold starting - Answer✔Heat
When setting up a piping system for exhaust gases the number of sharp bins should be kept to
a minimum to - Answer✔Prevent excessive exhaust back-pressure
Who does not have requirements that apply to exhaust components and hose types -
Answer✔U.s. coast guard
What is the most likely exhaust related cause for excessive engine operating temperature -
Answer✔Exhaust elbows that are old and clogged
1
, ©FYNDLAY 2025 ALL RIGHTS RESERVED 8:29 AM A+
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 - Answer✔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? - Answer✔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 - Answer✔Oxidization
Replacement of a failed sea water pump impeller should normally include - Answer✔Checking
all downstream components for impeller pieces
During a sea trial for a complaint of high-speed overheating the technician finds that the
cooling hoses are swollen and very firm when squeezed and the exhaust hose very hot to the
touch this most likely indicates - Answer✔Exhaust manifold or risers are blocked
Technician a says that you must observe USCG regulations when choosing and installing c Cox.
Tech b says there is no standard for Seahawks or their installation. What tech is correct -
Answer✔Neither tech is correct
during engine operation a technician notices that the water level is low in the sea water strainer
this might indicate which of the following - Answer✔sea water strainer has an air leak and sea
water inlet problems
The most common cause of low coolant temperature in a closed cooling system is - Answer✔A
faulty thermostat
Auxiliary heating devices such as cabin heaters and water heaters may require - Answer✔Using
a restrictor fitting and installing the device lower than the expansion tank
The transfer of heat through the fluid in the cooling system is known as - Answer✔Convection
2
