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

USCG Motor Plants & Auxiliary Boilers (Set 22)

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Question 1 of 30

What type of clutch is used in the illustrated medium-speed diesel engine reduction gear? Illustration MO-0085

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30 MCQs

#1 What type of clutch is used in the illustrated medium-speed diesel engine reduction gear? Illustration MO-0085 #2 The pinion gear shown in the illustration, is located __________. Illustration MO-0086 #3 What type of clutch is pictured in the illustration? Illustration MO-0089 #4 If oil discharges are detected when the scavenging air receiver drains are blown on a slow-speed, two-stroke, turbocharged, aftercooled engine, what is the most likely oil source? #5 Upon conducting a machinery space round on a main propulsion diesel, you detect a significant amount of water discharge when blowing down the charge air cooler or scavenging air receiver drains. What should you do? #6 Upon conducting a machinery space round on a slow-speed main propulsion diesel, you detect a significant amount of oil discharge when blowing down the scavenging air receiver drains. What should you do? #7 You are asked by the watch or duty engineer to check for any evidence for turbocharger surging. What should you check for? #8 An oil-operated, direct reversing mechanism on a large, low-speed, main propulsion diesel engine, can serve to __________. #9 When starting a diesel engine at temperatures below 70°F, the frictional resistance to turning will be __________. #10 Which of the following test indicators should be considered the most significant factor in determining as to whether or not a diesel-generator's lube oil should be drained and renewed? #11 A diesel engine with a combustion chamber located between the crowns of two pistons is known as a/an __________. #12 Which factor determines the size of the ring dam for a fuel oil centrifugal purifier? #13 The purpose of the interlocked three-way valve shown in the illustration is to __________. Illustration MO-0058 #14 The section of the turbocharger which would be connected to the aftercooler inlet is labeled __________. Illustration MO-0080 #15 Diesel engine jacket water is used in the fresh water distillation process as the __________. #16 A three-way thermostatic control valve regulates the diesel engine cooling water temperature by passing a portion of the water __________. #17 What would be considered a normal temperature increase between the inlet and outlet jacket cooling water of a medium or high-speed diesel engine operating at normal load? #18 Which operating parameter may need to be decreased when running a large main propulsion diesel engine at low load conditions? #19 Using a cooling water temperature of 225°F (107.2°C), instead of 180°F (82.2°C) in an auxiliary diesel engine, will __________. #20 As a general rule, what would be the recommended operating water jacket outlet temperature range for medium-speed marine diesels setup with closed treated fresh water cooling systems and fitted with vented expansion tanks? #21 In a diesel engine closed fresh water cooling system, the cooling water pressure drop through the engine is 10 psig, and the pressure drop through the heat exchanger is 4 psig at maximum flow rates. The cooling water pump must produce a discharge head of at least __________. #22 In a diesel engine jacket water cooler, with sea water cooling the fresh water, the __________. #23 In a diesel engine closed fresh water cooling system employing a radiator, proper water temperature can be obtained by __________. #24 If the jacket water temperature rises rapidly above normal in a diesel engine, you should FIRST __________. #25 The diesel engine shown in the illustration, is provided with an auxiliary blower to __________. Illustration MO-0003 #26 Which of the following statements is correct concerning the operating function of the governor shown in the illustration? Illustration MO-0096 #27 When the timing gear backlash for a Roots-type blower has become excessive, the problem is properly repaired by __________. #28 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? #29 If a single cylinder relief valve on a main propulsion diesel engine begins to lift, but it is not possible to secure the engine, which of the following actions should be taken? #30 What would be the first indication that a tube leak has occurred in area '23'? Illustration MO-0111

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