Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR

USCG Motor Plants & Auxiliary Boilers (Set 17)

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Question 1 of 30

In an auxiliary diesel engine, one reason for knurling the piston skirt is to __________.

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30 MCQs

#1 In an auxiliary diesel engine, one reason for knurling the piston skirt is to __________. #2 If an auxiliary diesel engine equipped with an electric starting system cranks very slowly after repeated attempts to start, the cause could be a/an __________. #3 On small diesel engines, a noticeable decrease in the time interval between the replacement of the lube filter cartridge indicates __________. #4 High exhaust temperature and black smoke exhausting from an auxiliary diesel engine can be caused by __________. #5 In a medium-speed marine propulsion engine equipped with direct admission air starting valves, the cylinders without air starting valves fire first because the __________. #6 Which internal combustion engine starting system uses a vane type fluid motor? #7 Which of the following operating characteristics of the Bendix drive friction clutch is associated with a Bendix drive starter? #8 Intercoolers installed on starting air compressors, reduce the possibility of __________. #9 The purpose of an oil mist detector in a main propulsion diesel engine is to warn of __________. #10 One advantage of a vacuum feed sight glass indicator used on cylinder lubricators over the discharge side liquid filled type sight glass is __________. #11 Mechanical lubricators for diesel engine cylinders are usually small reciprocating pumps which are __________. #12 The rate of cylinder lubricating oil metered to each cylinder of a large, low-speed, main propulsion diesel engine is __________. #13 A 'Blotter test' is a test performed on the lube oil of a diesel engine which can determine ______. #14 If the analysis of used lube oil indicates a high content of iron particles, this could indicate __________. #15 A decrease in the flash point of diesel engine lube oil indicates the lube oil has become __________. #16 A bronze bearing liner with a lead-tin flashing has a milky-white color over most of its surface and some areas of exposed bronze. The white coloring indicates __________. #17 A dirty lube oil strainer can result in __________. #18 Oil oxidation, as a result of excessively high lube oil temperature, is harmful to a diesel engine because __________. #19 Oil analysis for a crosshead type diesel engine indicates the TBN of the crankcase lubricating oil is increasing. This is most likely associated with which of the following? #20 When is fuel injected into a cylinder of diesel engines? #21 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 __________. #22 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 __________. #23 Heavy fuel oils generally have an upper average ash content of 0.1% by weight. Which of the following conditions could be expected if the ash content increases above this amount? #24 The temperature of the contaminated fuel oil fed to the centrifuge shown in the illustration should be __________. Illustration MO-0012 #25 The greatest difference between the centrifuge bowl shown in the illustration and that of a tubular bowl, with straight, vertical, interior surfaces, is that the illustrated unit __________. Illustration MO-0012 #26 The device labeled "D", as shown in the illustration, is the bowl __________. Illustration MO-0112 #27 The area indicated by the letter "W", shown in the illustration is correctly termed the __________. Illustration MO-0112 #28 What terminates the sludge discharge cycle of the device shown in the illustration? Illustration MO-0112 #29 After removing the bowl hood of the device shown in the illustration, excessive quantities of sludge are visible. Which of the following statements represents the approach to rectify the situation? Illustration MO-0112 #30 Differential needle valves used in fuel injectors are directly closed by __________.

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