ABYC Diesel Certification 2024 accurate Questions & Answers!!

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 after draining the sea water the system is prone to - ANSWER Oxidization Replacement of a failed sea water pump impeller should normally include - ANSWER Checking all downstream components for impeller pieces 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 - ANSWER Exhaust manifold or risers are blocked 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 - ANSWER Neither tech is correct during engine operation a technician notices that the water level is low in the sea water strainer this might indicate which of the following - ANSWER sea water strainer has an air leak and sea water inlet problems The most common cause of low coolant temperature in a closed cooling system is - ANSWER A faulty thermostat Auxiliary heating devices such as cabin heaters and water heaters may require - ANSWER Using a restrictor fitting and installing the device lower than the expansion tank The transfer of heat through the fluid in the cooling system is known as - ANSWER Convection Exhaust gas is leaking into the coolant system may be caused by a defective - ANSWER Cylinder head gasket Coolant conditioner filters should be replaced - ANSWER Follow the manufacturer's recommendation Exhaust gas is leaking into the coolant system may be caused by a - ANSWER Cylinder head gasket What is the maximum cold cranking amps allowed before a battery switches required - ANSWER 800 CCA Starter ground circuit resistance check sho