ABYC Diesel Exam Questions and Answers 100% Correct!

A dirty air filter may cause: -a decrease in fuel consumption -white exhaust smoke -a loss of power -hotter exhaust temperatures - ANSWER-a loss of power Diesel exhaust systems produce small amounts of a dangerous gas. The gas is: -carbon dioxide -carbon monoxide -sulfur dioxide -hydrocarbon - ANSWER-carbon monoxide Which of the following type wet exhaust below the waterline? -phase cancellation muffler -waterlift -surge tube -inline muffler - ANSWER-waterlift Which of the following is typically performed as part of the routine maintenance inspection of the seawater system? -removal of the exhaust risers -inspection of fresh water circulating pump for missing blades -inspection of seacock for correct operation -removal of engine exhaust manifold for internal inspection - ANSWER-inspection of seacock for correct operation During operation of the boat a technician notes an oil slick at the exhaust outlet. This lost likely indicates that: -the engine oil level is too high -there is a leak in a raw water oil cooler -incorrect engine oil was used -the engine is running too lean - ANSWER-there is a leak in the raw water oil cooler During an inspection of a closed cooling system the technician finds oil mixed in with the cooling solution. What step should be taken next? -remove the heat exchanger for servicing -identify and test any oil coolers in the system -flush the cooling system -take a sample of the coolant for testing - ANSWER-identify and test any oil coolers in the system On engines with closed cooling systems, what solutions should be used in the engine block? -ethylene glycol