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

USCG Motor Plants & Auxiliary Boilers (Set 6)

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Question 1 of 30

Injection pressure in a common rail fuel system is controlled by __________.

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30 MCQs

#1 Injection pressure in a common rail fuel system is controlled by __________. #2 According to the illustration, initial timing of fuel injection into the cylinder is controlled with the component that is identified as the letter _________. Illustration MO-0097 #3 According to the illustration, fuel cutoff timing in the cylinder is controlled with the component that is identified as the letter _________. Illustration MO-0097 #4 The amount of fuel delivered by a unit injector is controlled by the __________. #5 In a unit injector, an upper helix and lower helix are machined in the lower part of the plunger for __________. #6 The control rack to a unit injector regulates fuel delivery by __________. #7 A normally operating diesel engine is shutdown by __________. #8 Load control on a diesel engine is accomplished by __________. #9 Diesel engine automated control systems may utilize sensing devices of dual function, with sensing ranges providing both alarm and engine shut down capability. Which of the key points listed would only require an alarm sensor? #10 Which of the following statements describes the operation of the circuit shown in the illustration? Illustration MO-0114 #11 The device represented by the symbol "B" in the illustration is used to __________. Illustration MO-0115 #12 In the reversing reduction gear shown in the illustration, the forward and reverse main pinions are in constant mesh with the main gear. This means the __________. Illustration MO-0085 #13 Reduction gear casings are vented in order to __________. #14 A diesel engine with a full speed of 1000 RPM drives a propeller at 300 RPM. What is the speed reduction ratio? #15 The main engine thrust bearing shown in the illustration contains how many thrust shoes? Illustration MO-0121 #16 What type of bearing is shown in the illustration? Illustration MO-0120 #17 The minimum speed an engine must attain before ignition can occur depends upon __________. #18 Heat for igniting the fuel oil in the cylinder of a diesel engine is generated by the __________. #19 The main operating characteristic of diesel engines which distinguishes them from other internal combustion engines is the __________. #20 Theoretical perfect combustion in a diesel engine yields by-products of __________. #21 The formation of carbon monoxide in diesel exhaust gases is reduced by __________. #22 Turbulence of the compressed air charge in a diesel engine cylinder increases __________. #23 In a diesel engine, after ignition of the fuel occurs, but before the piston reaches TDC, there is little change in the cylinder __________. #24 In the starting process of a diesel engine, the main object is to attain the compression conditions sufficient to __________. #25 The greatest turbulence in a diesel engine cylinder is created by the __________. #26 What is the term given to the process of breaking up fuel oil into very fine particles for better combustion? #27 Proper atomization of fuel in diesel engine combustion chambers will __________. #28 Fuel oil penetration into the cylinder of a diesel engine is __________. #29 Fuel droplets injected into a diesel engine cylinder must have adequate penetration to __________. #30 Maintaining the proper fuel oil temperature will result in __________.

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