ABYC Diesel Exam Practice Questions & Answers (SCORED A+)
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Course
ABYC Diesel
Institution
ABYC Diesel
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 ...
ABYC Diesel Exam Practice Questions &
Answers (SCORED A+)
Black 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? -ANSWER - Technician A When draining a seawater cooled engine, the technician removes a drain plug and no water comes out. What is the most likely cause? -ANSWER - it 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? -ANSWER - heat exchanger
What doe MSDA stand for? -ANSWER - Material Safety Data Sheets
Exhaust gases leaking into the coolant system may be caused by a defective -
ANSWER - Cylinder-head Gasket
Coolant conditioner filters should be replaced: -ANSWER - According to manufacturers specification
Premature engine drive belt failure may be caused by -ANSWER - misalignment of pulleys
Which factors must be considered when installing/adjusting the transmission shift cable? -ANSWER - second 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? -ANSWER - Both are correct
To adjust a control cable, the technician should: -ANSWER - Adjust the terminal eye/cable anchor on the cable
According to ABYC standards, what is the minimum bend radius of a control cable? -
ANSWER - Manufacturer's recommended minimum
Modern battery testing techniques would include the use of a -ANSWER - DVOM
conductance battery testing may require input -ANSWER - CCA or MCA`
The ground circuit resistance check ( voltage drop) should be made by connecting the voltmeter -ANSWER - across the ground circuit and observe the meter while cranking
If the electric starter will not crank the engine, the problem may be caused by -
ANSWER - a run-down battery
a defective starter
internal engine problems
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