ABYC Diesel Certification Questions & Answers (Graded A+)

minimum spacing between hull vent openings and fuel fill or vent fititngs should be - ANSWER-15 inches thermal efficiency of a diesel engine is such that typical heat converted to useful power is approximately what percent of total heat - ANSWER-36% What is the primary difference between the gasoline-fueled and Jen four stroke cycle and the diesel four-stroke cycle - ANSWER-The intake stroke only brings air into the cylinder Temperature controlled engine room exhaust blowers in a diesel powered boat are primarily used to - ANSWER-Lower engine room temperatures With some diesel engines it is necessary to use what when cold starting - ANSWER-Heat When setting up a piping system for exhaust gases the number of sharp bins should be kept to a minimum to - ANSWER-Prevent excessive exhaust back-pressure Who does not have requirements that apply to exhaust components and hose types - ANSWER-U.s. coast guard What is the most likely exhaust related cause for excessive engine operating temperature - ANSWER-Exhaust elbows that are old and clogged 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 - ANSWER-Siphon break 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? - ANSWER-Tech b If you do not refill the raw water system with a winterizing solution for long-term storage