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

USCG General Subjects (Auxiliaries & Systems) (Set 10)

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Question 1 of 30

In a closed-loop process control system featuring negative feedback, what is the function of the error detector within the controller?

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30 MCQs

#1 In a closed-loop process control system featuring negative feedback, what is the function of the error detector within the controller? #2 What type of primary element for a pressure transmitter would be most suitable for measuring oil-fired boiler furnace and forced-draft pressures? #3 Which of the following rotational shaft speed sensors produces a digital signal? #4 Concerning the start-up of plain bearings utilizing the three modes of hydrodynamic lubrication, what is the correct sequence of modes from start-up through coming up to operational speed? #5 Which of the following bearing types would be an example of a rolling-element bearing which substitutes fluid friction for rolling contact friction? #6 A dented race in an antifriction bearing could be caused by __________. #7 In a compression type automatic grease cup, the lubricant is forced into the bearing by __________. #8 A roller bearing should normally be filled to what fraction of its space cavity? #9 A ball or roller bearing has an interference fit with the shaft upon which it is being installed with a hydraulic or arbor press. Upon what surface should the sleeve of the press be applied? #10 A ball or roller bearing has an interference fit with the housing in which it is being installed with a hydraulic or arbor press. Upon what surface should the sleeve of the press be applied? #11 A roller bearing has an interference fit with the shaft upon which it is being installed. What thermal method of mounting the bearing would be most appropriate? #12 Rolling element bearings may experience fatigue failure after a length of service. What is the first evidence of the beginnings of fatigue failure? #13 What is the primary indication of a grease lubricated bearing that is over-lubricated in terms of the quantity of grease in the housing? #14 Which of the following statements concerning antifriction bearings installed on pumps is true? #15 If the distilling plant first stage absolute pressure is higher than normal, while the second stage absolute pressure remains satisfactory, the probable fault is due to __________. #16 Scale formation in a flash-type evaporator is usually found in the __________. #17 Small droplets of water entrained in the flashed vapor produced in a flash-type evaporator are removed by the __________. #18 The brine level in the second-stage of a flash-type evaporator is determined in part by the feed rate, the rate of evaporation in both stages, and the __________. #19 Which of the tools listed must be used when retightening the plate type heat exchangers used in the device shown in the illustration? Illustration MO-0110 #20 While circulating heated sulfuric acid through a feed water heater of a flash evaporator for the purposes of scale removal, what would be the indication of the continued presence of scale? #21 When should mechanical cleaning of feed water heater tubes be accomplished? #22 What procedure can be used to reduce the rate of scale formation on the heating surfaces of a flash evaporator while still maintaining the desired rate of distillate production? #23 While circulating heated sulfuric acid through a feed water heater of a flash evaporator for the purposes of scale removal, what would be the indication of successful removal of the scale? #24 What is used to prevent contamination of a potable water system supplying a plumbing fixture such as a galley sink from a backup of sewage sanitary drains? #25 What type of disinfection system has the disadvantage that it would fail to provide residual disinfectant in the potable water? #26 Which of the following desalination plants will always require a sterilizer when providing water to a potable water system? #27 Which of the following statements concerning the arrangements of a potable water system is true? #28 On most commercial cargo vessels with a relatively small crew size and few users of the potable water system, how is the potable water system pressure maintained? #29 What is the primary purpose of the lead-lag arrangement of the two potable water pumps supporting a typical potable water system? #30 What design feature is used to minimize potable water wastage associated with hot water distribution piping for a potable water system?

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