Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR
USCG Motor Plants & Auxiliary Boilers (Set 7)
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Question 1 of 30
A diesel engine operating at a light load, when compared to operating at heavy load has an air/fuel ratio that is __________.
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30 MCQs #1 A diesel engine operating at a light load, when compared to operating at heavy load has an air/fuel ratio that is __________. #2 As engine RPM is increased from idle speed to full load speed, which of the conditions listed will decrease? #3 The time between injection and ignition of the fuel is known as __________. #4 When is fuel injected into a cylinder of diesel engines? #5 For a given fuel, a change in the compression ratio will affect the ignition lag by which of the listed means? #6 The rate of pressure rise during the period following fuel ignition in a diesel engine is influenced by the length of the ignition delay period and the __________. #7 The pressure in an operating diesel engine cylinder continues to rise for a short period after the piston passes top dead center as a result of the __________. #8 Which statement about diesel engine combustion is true? #9 Fuel combustion in a diesel engine cylinder should begin just before the piston reaches top dead center and should __________. #10 On the cylinder indicator diagram illustrated, the dotted line indicated as 'L' is describing the _________. Illustration MO-0033 #11 Which area of the indicator diagram illustrated, indicates the afterburning period in a diesel engine cylinder? Illustration MO-0033 #12 Item labeled 'R' as shown in section 6 of the illustration is identified as the __________. Illustration MO-0025 #13 In the illustrated engine, the fuel camshaft gear drive housing is indicated as letter __________. Illustration MO-0003 #14 In a large, slow-speed, main propulsion diesel engine, which of the parts listed is under tension when the engine is running? #15 In the diesel engine illustrated, what part is under compression when firing is taking place in a particular cylinder? Illustration MO-0003 #16 In diesel engines designed with a crosshead, the motion of the piston rod can be described as __________. #17 In a large slow-speed propulsion diesel engine, the side thrust on the crosshead is the direct result of _____. #18 While underway, which of the following would be the FIRST step in reversing a direct reversing large, slow-speed, main propulsion, diesel engine? #19 In a large slow-speed propulsion diesel engine, the force applied to the piston is __________. #20 Cast iron pistons used in large propulsion diesel engines are constructed with __________. #21 Which of the following procedures should be carried out when a large, low-speed, diesel engine is operated with one cylinder secured? #22 During maneuvering operations for a direct reversing large, low-speed, main propulsion diesel engine, which of the following actions is used to stop the shaft from turning prior to changing the engine rotation for a vessel with moderate headway? #23 The line identified as "I" in the illustration is used to __________. Illustration MO-0066 #24 Valve cages are used on some large diesel engines to __________. #25 A diesel engine crankcase ventilation system __________. #26 A safety crankcase cover differs from other diesel engine access doors in that it is fitted with a __________. #27 According to the illustration, fuel delivery to the cylinder is terminated and controlled with the component that is identified as the letter _________. Illustration MO-0097 #28 There are two glands provided where the piston rod exits the cylinder shown in the illustration. The purpose of the top gland is to __________. Illustration MO-0083 #29 The diesel engine shown in the illustration, the exhaust manifold is indicated by the letter __________. Illustration MO-0003 #30 The opening of an exhaust valve on a modern, large, low-speed, main propulsion diesel engine, may be actuated by __________.
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