ABYC Diesel Certification 2024 Exam review Questions with completesolutions

1. minimum spacing between hull vent openings and fuel fill or vent fittings should be - 15 inches 2. thermal efficiency of a diesel engine is such that typical heat converted to useful power is approximately what percent of total heat - 36% 3. What is the primary difference between the gasoline-fueled and Jen four stroke cycle and the diesel four-stroke cycle - The intake stroke only brings air into the cylinder 4. Temperature controlled engine room exhaust blowers in a diesel powered boat are primarily used to - Lower engine room temperatures 5. With some diesel engines it is necessary to use what when cold starting - Heat 6. When setting up a piping system for exhaust gases the number of sharp bins should be kept to a minimum to - Prevent excessive exhaust back-pressure 7. Who does not have requirements that apply to exhaust components and hose types - U.s. coast guard 8. What is the most likely exhaust related cause for excessive engine operating temperature - Exhaust elbows that are old and clogged 9. an engine equipped with an exhaust mixing elbow is installed below the waterline what device must be installed in the raw water discharge hose ahead of the mixing elbow - Siphon break 10. Upon inspection of the wet exhaust system the technician notices that the exhaust hose is burned near the elbow tech a says that replacing the hose will correct the problem. Tech b says that the problem is most likely with the cooling system which tech is correct? - Tech b 11. If you do not refill the raw water system with a winterizing solution for long-term storage after draining the sea water the system is prone to - Oxidization 12. Replacement of a failed sea water pump impeller should normally include - Checking all downstream components for impeller pieces 13. During a sea trial for a complaint of high-speed overheating the technician finds that the cooling hoses are swollen and very firm when squeezed and the exhaust hose very hot to the touch this most likely indicates - Exhaust manifold or risers are blocked 14. Technician a says that you must observe USCG regulations when choosing and installing c Cox. Tech b says there is no standard for Seahawks or their installation. What tech is correct - Neither tech is correct 15. during engine operation a technician notices that the water level is low in the sea water strainer this might indicate which of the following - sea water strainer has an air leak and sea water inlet problems 16. The most common cause of low cool