ABYC DIESEL CERTIFICATION 2025 QUESTIONS WITH 100% PASSED ANSWERS!!
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
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
, ABYC DIESEL CERTIFICATION 2025 QUESTIONS WITH 100% PASSED ANSWERS!!
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
Exhaust gas is leaking into the coolant system may be caused by a defective - (answer)Cylinder head
gasket
Coolant conditioner filters should be replaced - (answer)Follow the manufacturer's recommendation
Exhaust gas is leaking into the coolant system may be caused by a - (answer)Cylinder head gasket
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
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
, ABYC DIESEL CERTIFICATION 2025 QUESTIONS WITH 100% PASSED ANSWERS!!
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
Exhaust gas is leaking into the coolant system may be caused by a defective - (answer)Cylinder head
gasket
Coolant conditioner filters should be replaced - (answer)Follow the manufacturer's recommendation
Exhaust gas is leaking into the coolant system may be caused by a - (answer)Cylinder head gasket
