Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR
USCG Motor Plants & Auxiliary Boilers (Set 24)
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Question 1 of 30
While underway, a slow-speed diesel engine lube oil sump level slowly begins to decrease. Which of the following should be checked?
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30 MCQs #1 While underway, a slow-speed diesel engine lube oil sump level slowly begins to decrease. Which of the following should be checked? #2 While bunkering heavy fuel, what quick/easy test can one perform onboard to determine the compatibility of 'old' with 'new' fuel? #3 Does sulfur content of heavy fuel oil effect the fuel rate of a diesel engine and why or why not? #4 Catalytic fines comprised of aluminum oxide and/or silicon dioxide are a common contaminant of residual fuels. Which diesel engine components would be most effected by catalytic fines in fuel? #5 Fuel combustion in a diesel engine cylinder should begin just before the piston reaches top dead center and should __________. #6 During the change over period from residual to distillate fuel the final fuel filters clog at a decreasing time interval. What is the most likely cause? #7 What operational difficulties are associated with fuel incompatibility? #8 A motor vessel has three centrifuges to pre-treat the fuel which can be configured to operate in series, parallel, and series-parallel. A large quantity of water is determined to be present in the fuel. How would you configure the centrifuges to deal with this problem? #9 A motor vessel has two centrifuges to pre-treat fuel to the engine(s) which may be configured to operate in series or parallel. A large quantity of water has been determined to be present in the fuel. What actions would you take to minimize the effect of water prior to fuel injection? #10 In pre-treating fuel oil on a motor vessel, what would you consider the most important factor to prevent high temperature corrosion on an engine's combustion components? #11 When changing over from residual to distillate fuel on a slow-speed diesel main engine, what is a good guideline to follow regarding the change over? #12 When changing over from residual to distillate fuel on a slow-speed diesel propelled vessel, you should limit the rate of temperature change of the fuel in order to prevent what operational difficulty? #13 Your ship is equipped with ALCAP heavy fuel oil purifiers. The watchstander reports excessive water drained from the fuel oil service tank. Which component should he check? #14 On a slow-speed diesel engine vessel equipped with an ALCAP fuel oil purification system, what would be a symptom of an opening solenoid valve leaking by? #15 High cylinder firing pressure, accompanied by low exhaust temperature, can result from __________. #16 Heat damage to fuel injection nozzles can be prevented by avoiding __________. #17 Faulty operation of diesel engine fuel injection nozzles can be a direct cause of __________. #18 Surface irregularities, such as erosion and pitting on injection pump plungers, will __________. #19 While examining a used fuel injection nozzle(s), one finds worn and enlarged orifices. What does this indicate about that cylinder's performance prior to nozzle replacement(s)? #20 Injection lag in a diesel engine may be caused by __________. #21 In the common rail system, excessive pressure in the header may be caused by __________. #22 The diesel engine shown in the illustration, is provided with an auxiliary blower to __________. Illustration MO-0003 #23 A loop or cross scavenged engine utilizes the motion of its pistons and a turbocharger to provide scavenging air. Which of the listed mechanical designs prevents the air under the pistons from being pumped back through the scavenge ports during the piston power stroke? #24 Maintaining the lowest possible scavenging air temperature at all times is not recommended due to the possibility of the __________. #25 Which of the listed problems will happen when the water level of a fire-tube type auxiliary boiler approaches the crown sheet? #26 Which of the following statements concerning fire-tube boilers is correct? #27 Why should the main steam stop valve of an auxiliary boiler be eased off its seat and then gently closed before lighting off? #28 An exhaust gas bypass is installed on a waste heat boiler in order to __________. #29 Waste heat boilers may be equipped with vents on the feedwater heater heads to __________. #30 As shown in the illustration, the component labeled 'E' would be identified as a ______. Illustration MO-0128
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