ABYC DIESEL ENGINE Systems Certification Exam Review Verified Questions and Answers 100% Already Graded A+ Excel

ABYC DIESEL ENGINE Systems Certification Exam Review Verified Questions and Answers 100% Already Graded A+ Excel A dirty air filter may cause: -a decrease in fuel consumption -white exhaust smoke -a loss of power -hotter exhaust temperatures - CORRECT 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 - CORRECT ANSWER-carbon monoxide Which of the following type wet exhaust below the waterline? -phase cancellation muffler -waterlift -surge tube -inline muffler - CORRECT 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 - CORRECT 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 - CORRECT 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 - CORRECT 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 -propylene glycol -as per manufacturer's specification -Benzene - CORRECT ANSWER-as per manufacturer's specification Premature failure of a pump drive belt may be caused by: -corrosion on the drive surfaces of the pulley -incorrect impeller -excessive coolant concentration -lack of belt dressing - CORRECT ANSWER-corrosion on the drive surfaces of the pulley The owner complains that the throttle handle will not hold position. What adjustment might correct this problem? -neutral detent adjustment -throttle friction adjustment at the control head -lubricate the cable -engine throttle lever adjustment - CORRECT ANSWER-throttle friction adjustment at the control head* The first component to check when testing a 12-volt direct current starting circuit is the -switch -regulator -battery -wiring - CORRECT ANSWER-battery An average charging circuit voltage on a 12-volt lead acid system is ________. -7.5 to 8.4 -11.5 to 13.3 -13.8 to 14.8 -14.9 to 16.1 - CORRECT ANSWER-13.8 to 14.8 Compared to gasoline, diesel fuel is more susceptible to -microbe contamination -algae growth contamination -phase separation -silicate dropout - CORRECT ANSWER-microbe contamination The most frequent cause of diesel engine problems is due to -improper air source -engine improperly tuned -fuel contamination -high operating temperature - CORRECT ANSWER-fuel contamination A leak in piping connections between the turbocharger and engine intake manifold could cause the engine to -miss -burn oil -emit dark or black exhaust -overheat - CORRECT ANSWER-emit dark or black exhaust What color smoke indicates excessive lube oil consumption in a diesel engine? -blue -white -black -gray - CORRECT ANSWER-blue Black soot around the engine compartment openings might indicate which of the following? Dirty fuel filter Insufficient engine room ventilation Improper fuel pump timing High exhaust back pressure - CORRECT ANSWER-Insufficient engine room ventilation If the engine does not achieve full rpm, which of these tests would be the LAST to be performed? Compression check Engine room depression test Boost pressure test Fuel inlet restriction test - CORRECT ANSWER-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. Which of the following is the MOST likely cause? Hose has disconnected Hose has been crushed Air inlet duct is underwater Blower motor armature bearings are seizing - CORRECT ANSWER-Blower motor armature bearings are seizing