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ABYC Diesel Exam Practice Questions And Accurate Answers
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ABYC Diesel Exam Practice Questions AndAccurate Answers
Black soot around the engine compartment openings may indicate: - Answer Poor
engine room ventilation
If the engine does not reach full rpm, which of the following tests would you conduct
last? - Answer compression check
The exhaust blower switch is on but the noise coming from the blower doesn't sound
correct. After running for some time, the breaker pops. What is the likely cause? -
Answer Blower motor armature bearings are seizing
what component is/are installed to provide proper clearance about the outside water
line? - Answer Exhaust flapper and riser extension
Diesel exhaust systems produce small amounts of a dangerous gas, the gas is: - Answer
Carbon Monoxide
While many exhaust silencers can do a good job of reducing noise level, they will be
unacceptable if they - Answer set up objectionable back pressure
What wet exhaust system is best used with engines at or below the water line - Answer
Water lift
The owner complains overheating at high speed after recent reposer. Technician A says
the most probable cause of malfunction is thermostats. Technician B says the seawater
intake system should be checked against MFG specifications. Who is correct? - Answer
Technician B
, During operation of the boat the technician notices an oil slick at the exhaust outlet. This
most likely indicates - Answer There is a leak in the raw water cooler
Technician A says the impellers should be routinely replaced. Technician B says that
you can extend the life if you reverse the impeller's direction. Who is Correct? - Answer
Technician A
Sacrificial anodes are used for galvanic protection in hear exchangers because they are
- Answer More anodic than other alloys in the system
When re-installing an oil cooler, technician A says that the oil flow should be opposite
that of the water flow. Technician B says that the oil and water flow should go in the
same direction. Who is correct? - Answer Technician A
If a technician was to drain a seawater cooled engine, he would remove the drain plug.
No water would come out - what is likely to be the cause? Answer: It may be blocked,
use a tool to remove the blockage
What is transferred from engine coolant to seawater in a closed cooling system by what
component? Answer: heat exchanger
What doe MSDA stand for? Answer: Material Safety Data Sheets
Which may be the cause of exhaust gases leaking into the coolant system due to a
defective - Answer Cylinder-head Gasket
Coolant conditioner filters must be changed: - Answer According to manufacturers
specification
Causes of Premature engine drive belt failure - Answer misalignment of pulleys
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