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

USCG General Subjects (Auxiliaries & Systems) (Set 1)

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Question 1 of 30

If a heat exchanger is designed to condense refrigerant vapor using central cooling fresh water as a condensing medium, what statement is true?

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30 MCQs

#1 If a heat exchanger is designed to condense refrigerant vapor using central cooling fresh water as a condensing medium, what statement is true? #2 The general purpose of a heat exchanger is to __________. #3 Pressure in an operating hydraulic system is developed __________. #4 The by-products of oxidation, as a result of water contamination of hydraulic oil, are generally __________. #5 Energy losses occurring in a hydraulic system are ultimately absorbed by the __________. #6 Energy imparted to the hydraulic fluid in an operating hydraulic system is stored in the __________. #7 The component which is used to thoroughly separate small, fine, dust-like particulate contamination from hydraulic fluid is a/an __________. #8 The portion of a hydraulic hose that determines its overall strength is the __________. #9 To convert a vane type hydraulic pump to a hydraulic motor, which of the following would have to be done? #10 Return lines in a non-pressurized hydraulic system reservoir should enter the tank well below the fluid surface level to __________. #11 If a standard bourdon tube type pressure gauge that is designed to measure and display gauge pressure reads 43.8 psig, what would be the equivalent absolute pressure? #12 What type of direct reading thermometer works on the principle of differential expansion of dissimilar metals as the temperature rises and features a rotary dial scale? #13 If the mercury has become separated in a liquid-in-glass thermometer, what can be done to correct this situation? #14 What statement is true concerning the vent pipes and sounding tubes associated with a vented tank? #15 What statement best represents the characteristics of an innage tape and bob for the purposes of taking a vented tank sounding? #16 What statement best represents the characteristics of innage and ullage tank soundings? #17 For a lubricating oil, what is the relationship between viscosity and temperature? #18 What statement is true concerning viscosity index as it applies to lubricating oils? #19 What type of grease is the most commonly used aboard ship? #20 Which one of the following is a difference between a typical relief valve and a typical safety valve? #21 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? #22 Which of the listed substances can be satisfactorily removed from diesel fuel by centrifuging? #23 For optimum results, centrifugal purification of heavy fuel oil should be accomplished with the fuel at the lowest practicable __________. #24 By what means is biological sewage treatment plant effluent disinfected before discharge overboard? #25 Bottom blow valves are installed on auxiliary water-tube boilers to __________. #26 The tube sheets installed in a fire-tube auxiliary boiler are normally connected by __________. #27 The primary function of a flame safeguard system, as used on an automatically fired auxiliary boiler, is to prevent __________. #28 Back injuries are one of the most common injuries that result in lost work time. What is the proper technique for lifting an object? #29 What type of respiratory protection provides the greatest protection from the various respiratory hazards, is specifically designed for emergency and rescue situations, but has time constraints associated with its use? #30 The size of ball and roller bearings can be identified by the __________.

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