ABYC DIESEL EXAM QUESTIONS AND ALL
ANSWERS CORRECT (RECENTLY UPDATED)
Black soot surrounding the engine compartment apertures could be a sign of
inadequate ventilation in the engine room.
Which test would be carried out last if the engine fails to reach full rpm?
ANSWER check for compression
Although the exhaust blower switch is turned on, the blower's sound is unusual.
The breaker trips after some time. Which cause is most likely? ANSWER The
armature bearings of blower motors are seizing.
What part or parts are in place to give the outside water line adequate clearance?
ANSWER Extension of the exhaust flapper and riser
A hazardous gas that is produced in trace amounts by diesel exhaust systems is:
The carbon monoxide answer
Even though a lot of exhaust silencers can effectively lower noise levels, they
won't be acceptable if they ANSWER create an unpleasant back pressure.
ANSWER Water lift: Which wet exhaust system works best for engines at or
below the water line?
The owner reports rapid speed overheating after a recent reposer. The
thermostats are probably the issue, according to Technician A. Who is right
when Technician B suggests that the seawater intake system be examined in
comparison to the MFG specifications? ANSWER Technician B
The technician observes an oil slick at the exhaust outlet when the boat is in
operation. This probably means that ANSWER The raw water chiller has a leak.
, According to Technician A, the impellers ought to be changed on a regular
basis. According to Technician B, reversing the impeller's direction can prolong
its lifespan. Who's Right? ANSWER Technician A
Because sacrificial anodes are more anodic than other alloys in the system, they
are utilized in hear exchangers for galvanic protection.
According to technician A, the oil flow should be the opposite of the water flow
when reinstalling an oil cooler. The water and oil should flow in the same
direction, according to Technician B. Who is right? ANSWER Technician A
When a mechanic pulls a drain plug from a seawater-cooled engine, no water
emerges. Which cause is most likely? ANSWER: If it's obstructed, utilize a tool
to get rid of it.
What part of a closed cooling system transfers heat from engine coolant to
seawater? Heat exchanger ANSWER
What is meant by MSDA? Material Safety Data Sheets for Answers
A faulty ANSWER Cylinder-head Gasket could be the source of exhaust gasses
seeping into the coolant system.
Replace the coolant conditioner filters: ANSWER In accordance with the
manufacturer's specifications
ANSWER pulley misalignment may be the cause of premature engine drive belt
failure.
When installing or modifying the transmission shift cable, certain elements need
to be taken into account? ANSWER: The second station regulates tight bends or
cracks in the jacket.
The owner gripes that using a single lever control requires two hands.
According to Technician A, the cable can be incorrectly routed and excessively
long. According to Technician B, the control head might require lubrication and
cleaning. Which technician is right? ANSWER Both are accurate.
ANSWERS CORRECT (RECENTLY UPDATED)
Black soot surrounding the engine compartment apertures could be a sign of
inadequate ventilation in the engine room.
Which test would be carried out last if the engine fails to reach full rpm?
ANSWER check for compression
Although the exhaust blower switch is turned on, the blower's sound is unusual.
The breaker trips after some time. Which cause is most likely? ANSWER The
armature bearings of blower motors are seizing.
What part or parts are in place to give the outside water line adequate clearance?
ANSWER Extension of the exhaust flapper and riser
A hazardous gas that is produced in trace amounts by diesel exhaust systems is:
The carbon monoxide answer
Even though a lot of exhaust silencers can effectively lower noise levels, they
won't be acceptable if they ANSWER create an unpleasant back pressure.
ANSWER Water lift: Which wet exhaust system works best for engines at or
below the water line?
The owner reports rapid speed overheating after a recent reposer. The
thermostats are probably the issue, according to Technician A. Who is right
when Technician B suggests that the seawater intake system be examined in
comparison to the MFG specifications? ANSWER Technician B
The technician observes an oil slick at the exhaust outlet when the boat is in
operation. This probably means that ANSWER The raw water chiller has a leak.
, According to Technician A, the impellers ought to be changed on a regular
basis. According to Technician B, reversing the impeller's direction can prolong
its lifespan. Who's Right? ANSWER Technician A
Because sacrificial anodes are more anodic than other alloys in the system, they
are utilized in hear exchangers for galvanic protection.
According to technician A, the oil flow should be the opposite of the water flow
when reinstalling an oil cooler. The water and oil should flow in the same
direction, according to Technician B. Who is right? ANSWER Technician A
When a mechanic pulls a drain plug from a seawater-cooled engine, no water
emerges. Which cause is most likely? ANSWER: If it's obstructed, utilize a tool
to get rid of it.
What part of a closed cooling system transfers heat from engine coolant to
seawater? Heat exchanger ANSWER
What is meant by MSDA? Material Safety Data Sheets for Answers
A faulty ANSWER Cylinder-head Gasket could be the source of exhaust gasses
seeping into the coolant system.
Replace the coolant conditioner filters: ANSWER In accordance with the
manufacturer's specifications
ANSWER pulley misalignment may be the cause of premature engine drive belt
failure.
When installing or modifying the transmission shift cable, certain elements need
to be taken into account? ANSWER: The second station regulates tight bends or
cracks in the jacket.
The owner gripes that using a single lever control requires two hands.
According to Technician A, the cable can be incorrectly routed and excessively
long. According to Technician B, the control head might require lubrication and
cleaning. Which technician is right? ANSWER Both are accurate.
