ABYC Diesel Exam Practice Questions and Answers. Graded 100%

Black soot around the engine compartment openings might indicate: - Insufficient engine room ventilation if the engine does not achieve full rpm, what test would be the last to be performed? - 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? - Blower motor armature bearings are seizing what component is/are installed to provide proper clearance about the outside water line? - Exhaust flapper and riser extension Diesel exhaust systems produce small amounts of a dangerous gas, the gas is: - Carbon Monoxide While many exhaust silencers can do a good job of reducing noise level, they will be unacceptable if they - set up objectionable back pressure What wet exhaust system is best used with engines at or below the water line - 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? - Technician B During operation of the boat the technician notes an oil slick at the exhaust outlet. This most likely indicates - 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? - Technician A Sacrificial anodes are used for galvanic protection in hear exchangers because they are - 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? - 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? - 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? - heat exchanger What doe MSDA stand for? - Materi