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

USCG Steam Plants (Boilers & Turbines) (Set 27)

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Question 1 of 30

Water retained in the lube oil system of a main propulsion turbine installation is undesirable because it __________.

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30 MCQs

#1 Water retained in the lube oil system of a main propulsion turbine installation is undesirable because it __________. #2 A cloudy or milky appearing lube oil sample, taken from the main lubricating oil system could be caused by __________. #3 Which of the following would contribute to the formation of an oil and water emulsion, in addition to acid formation? #4 Which of the following conditions may exist if you detect an excessive amount of metal particles on a main engine lube oil strainer magnet? #5 Which of the following types of bearings are used as line shaft bearings? #6 Babbitt is a metal alloy commonly used for lining __________. #7 The splits located in the halves of main reduction gear bearings are aligned at an angle to the horizontal in order to resist __________. #8 Most main propulsion reduction gear bearings are __________. #9 Which of the devices listed is commonly used to compensate for the expansion and minor misalignments occurring between the main turbine rotor and the reduction gear? #10 Which of the following statements is true concerning the coupling shown in the illustration? Illustration SE-0001 #11 The part shown in the illustration would be located between which of the following components of a modern geared turbine main propulsion unit? Illustration SE-0001 #12 The purpose of the main reduction gears is to __________. #13 What is the significance of pinion deflection in the operation of reduction gears? #14 The component labeled "II", as shown in the illustration, is called the __________. Illustration SE-0013 #15 The reduction gear shown in the illustration is a/an __________. Illustration SE-0013 #16 Regarding main reduction gears, when high speed first reduction pinions and gears are connected to low speed pinions and gears, each contained in a sequential portion of the gear housing, the reduction gear unit is known as __________. #17 As found in a reduction gear drive system, thrust bearings serve to __________. #18 In the thrust bearing assembly illustrated the total oil clearance can be correctly decreased by __________. Illustration SE-0007 #19 In the diagrammatic arrangement of the thrust bearing, shown in the illustration, the direction of shaft rotation and the direction of thrust are indicated respectively by arrows __________. Illustration SE-0012 #20 A Kingsbury, or pivot shoe type thrust bearing, can bear much greater loads per square inch of working surface than can parallel surface bearings because provisions are made in the Kingsbury bearing __________. #21 The base ring shown in the illustration is identified by the letter __________. Illustration SE-0012 #22 Which of the statements listed applies to the quill shaft shown in the illustration? Illustration SE-0005 #23 Which of the following operational practices is helpful in avoiding the accumulation of condensate in the main reduction gear casing? #24 99. The most practical method of determining the condition of a shaft bearing while the shaft is in operation is to __________. #25 00. Which of the listed operational checks should be made "continuously" on the main propulsion reduction gears? #26 Which immediate action should you take when the temperature of one line shaft bearing increases above its normal operating temperature? #27 The most practical method of determining the condition of a shaft bearing while the shaft is in operation is to __________. #28 Which of the following would cause the dowel or locking lip of a split-type, precision insert, main bearing to shear and allow the bearing to rotate with the journal? #29 If a line shaft bearing begins to overheat, the shaft speed should be reduced. If overheating persists, you should then __________. #30 While a vessel is underway the low pressure turbine high-speed pinion is damaged. The pinion is then removed from the gear train. Under these circumstances, the main unit is capable of which speed and direction?

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