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ABYC Diesel Exam Practice Questions and Answers
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ABYC Diesel Exam PracticeBlack soot around the engine compartment openings might indicate: - answer
Insufficient engine room ventilation
if the engine does not achieve full rpm, what test would be the last to be performed? -
answer compression check
The exhaust blower switch is activated but the sound coming from the blower is not
normal. After a period of time, the breaker trips. What is the most 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
Following a recent reposer, the owner complains of overheating at high speed.
Technician A says that the thermostats are most likely the problem. Technician B says
that the seawater intake system should be checked against the MFG specifications,
who is correct? - answer Technician B
During operation of the boat the technician notes 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? - answerTechnician A
When draining a seawater cooled engine, the technician removes a drain plug and no
water comes out. What is the most likely cause? - answerit may be blocked, use a tool
to remove the blockage
What component is used to transfer heat from engine coolant to seawater in a closed
cooling system? - answerheat exchanger
What doe MSDA stand for? - answerMaterial Safety Data Sheets
Exhaust gases leaking into the coolant system may be caused by a defective -
answerCylinder-head Gasket
Coolant conditioner filters should be replaced: - answerAccording to manufacturers
specification
Premature engine drive belt failure may be caused by - answermisalignment of pulleys
Which factors must be considered when installing/adjusting the transmission shift
cable? - answersecond station controls
cracks in the jacket
kinks or tight bends
The owner complains that it takes two hands to operate a single lever control.
Technician A says that the cable may be too long and improperly routed. Technician B
says that the control head may need cleaning and lubricating. Which technician is
correct? - answerBoth are correct
To adjust a control cable, the technician should: - answerAdjust the terminal eye/cable
anchor on the cable
According to ABYC standards, what is the minimum bend radius of a control cable? -
answerManufacturer's recommended minimum
Modern battery testing techniques would include the use of a - answerDVOM
conductance battery testing may require input - answerCCA or MCA`
The ground circuit resistance check ( voltage drop) should be made by connecting the
voltmeter - answeracross the ground circuit and observe the meter while cranking
If the electric starter will not crank the engine, the problem may be caused by - answera
run-down battery
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