Pass Benchmark: 70% • Standard: USCG NMC / 46 CFR

USCG Engine General (Supplementary) (Set 11)

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Question 1 of 30

The general purpose of a heat exchanger is to __________.

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30 MCQs

#1 The general purpose of a heat exchanger is to __________. #2 With regard to the relative flow patterns through the tubes and the shell of shell-and- tube heat exchangers, what statement is true? #3 With regard to the number of passes through the tubes of shell-and-tube heat exchangers, what statement is true? #4 If a heat exchanger is designed to cool lubricating oil using sea water as a cooling medium, what statement is true? #5 If a heat exchanger is designed to heat heavy fuel oil using steam as a heating medium, what statement is true? #6 If a heat exchanger is designed to evaporate sea water using diesel engine jacket water as an evaporating medium, what statement is true? #7 If a heat exchanger is designed to condense refrigerant vapor using central cooling fresh water as a condensing medium, what statement is true? #8 What type of flow pattern would be associated with a forced-convection finned-coil heat exchanger such as an air-cooled hydraulic oil cooler? #9 If a seawater-cooled shell-and-tube lubricating oil cooler has the seawater inlet and outlet connections on the opposite end water boxes, in terms of the number of passes, what statement is true? #10 If both the shell-and-tube lube oil cooler and shell-and-tube jacket water cooler of a diesel engine are seawater cooled, what statement is true? #11 Which of the following provisions for thermal expansion for shell-and-tube heat exchangers only requires a single tube sheet located at one end? #12 Which of the following provisions for thermal expansion for shell-and-tube heat exchangers has a tube arrangement featuring a "tube-within-a-tube"? #13 In a shell-and-tube heat exchanger, which of the following tube types would be LEAST susceptible to tube-side fouling? #14 For a given shell diameter and tube sizes for a shell-and-tube heat exchanger, which tube pitch pattern would be the most compact design allowing for the most tubes? #15 For a shell-and-tube heat exchanger, which tube pitch pattern would feature "see- through" lanes and would most easily allow external mechanical cleaning of the tubes? #16 Concerning the baffles of a shell-and-tube heat exchanger, what statement is true? #17 For marine-type shell-and-tube heat exchangers, what is the most common arrangement for baffles? #18 What prevents the two fluids in a plate type heat exchanger from coming into direct contact with each other and mixing? #19 With regard to the flow patterns associated with plate type heat exchangers, which flow pattern is able to achieve counter-flow on opposite sides of each heat exchange plate? #20 What is the most common arrangement for a compact heat exchanger such as that used on an air conditioning cooling coil located in a ventilation supply duct? #21 When placing a shell-and-tube heat exchanger with a removable tube bundle such as a bayonet-tube heavy fuel oil service heater into service, to avoid thermal shock what statement represents the correct operating procedure? #22 When placing a shell-and-tube heat exchanger with a removable tube bundle such as a bayonet-tube heavy fuel oil service heater into service, to prevent water hammer what statement represents the correct operating procedure? #23 When taking a shell-and-tube heat exchanger with a removable tube bundle such as a bayonet-tube type heavy fuel oil service heater out of service, to avoid thermal shock what statement represents the correct operating procedure? #24 When taking a shell-and-tube heat exchanger with a removable tube bundle such as a bayonet-tube heavy fuel oil service heater out of service, to prevent water hammer what statement represents the correct operating procedure? #25 When placing a shell-and-tube heat exchanger with a non-removable tube bundle such as a lube oil cooler with fixed tube sheets into service, to avoid thermal shock what statement represents the correct operating procedure? #26 When placing a shell-and-tube heat exchanger such as a jacket water cooler into service, to insure optimal heat transfer what statement represents the correct operating procedure? #27 When securing a seawater-cooled shell-and-tube heat exchanger for an extended period of time, what statement represents the recommended operating procedure? #28 When shifting heat exchangers such as main engine lube-oil coolers, what statement represents the recommended operating procedure if the shift is to occur during engine operation? #29 Suppose a diesel engine is fitted with seawater-cooled lube oil and jacket water coolers. What statement is true concerning the system operating pressures? #30 What is the primary indication of fouling of a heat exchanger?

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