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

USCG Steam Plants (Boilers & Turbines) (Set 11)

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Question 1 of 30

Which of the following statements represents the significance of the differential pressure existing between the nozzle block and steam chest of a turbo generator equipped with a lifting beam mechanism?

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30 MCQs

#1 Which of the following statements represents the significance of the differential pressure existing between the nozzle block and steam chest of a turbo generator equipped with a lifting beam mechanism? #2 Which of the following is used to hold the poppet valves closed in a turbo generators nozzle control speed regulator? #3 A motor driven synchronizing device, figure "D" shown in the illustration, operated from the generator switchboard, initiates fine adjustments to the steam turbine speed by directly __________. Illustration SE-0009 #4 The maximum temperature rise of oil passing through any reduction gear set, or bearing, should not exceed __________. #5 When the temperature of the main turbine lubricating oil is lowered, an increase will occur in the __________. #6 In order to maintain the required lube oil temperature leaving a lube oil cooler, where an automatic bypass valve is not provided, which of the following operations is correct? #7 In a pressure type main propulsion turbine lubrication system, the lube oil service pumps normally take suction from the main sump and discharge directly to the __________. #8 To assure the main propulsion turbine bearings are receiving the proper lube oil supply, you should check the __________. #9 The term 'separation' as used in oil purification refers to the removal of __________. #10 If contaminated lube oil were allowed to settle undisturbed in a tank, into which layers would the contaminants separate? #11 Lube oil cannot be efficiently filtered i f it¶s __________. #12 According to the illustration, what is the normal function of the component shown? Illustration SE-0010 #13 A common method of preheating main turbine lube oil prior to rolling over the main unit would be to ________. #14 Which of the following types of bearing lubrication schemes can carry the highest unit loading? #15 As lube oil absorbs moisture its dielectric strength can be expected to __________. #16 Which of the following conditions is indicated by oil flowing through a lube oil gravity tank overflow sight glass? #17 The gravity tank in a gravity lube oil system serves to __________. #18 What type of lube oil cooler is shown in the illustration? GS-0122 #19 During high speed operation of the main turbine propulsion unit, the heat absorbed by the lubricating oil is removed by the __________. #20 Which of the following statements is true concerning lube oil coolers? #21 If the main and standby lube oil service pumps of the main engine fail while underway at sea, __________. #22 In a pressure type main propulsion turbine lubrication system, the lube oil service pumps normally take suction from the main sump and discharge directly to the __________. #23 Magnets are installed in the main propulsion turbine lube oil strainers to attract metal particles released through wearing of the __________. #24 As the speed of an oil lubricated ball bearing increases, fluid friction, due to churning, generates heat. This condition may be avoided by __________. #25 Which of the filters listed will deplete the additives in lubricating oil? #26 Turbine lube oil suction strainer baskets have __________. #27 One limiting problem of lube oil filters restricting their use in large lube oil systems is __________. #28 Fine metallic particles, which may originate from wear or failure of the lube oil service pump internal parts, are prevented from contaminating the bearings served by the lube oil system by __________. #29 Of the many impurities commonly found in marine lubricating oil, which of the following CANNOT be removed by a centrifugal purifier at normal operating speeds and temperatures? #30 In order to obtain the best performance with a lube oil purifier, the lube oil inlet temperature should __________.

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