Pass Benchmark: 70% • Standard: USCG NMC / 46 CFR
USCG Engine Refrigeration (Supplementary) (Set 4)
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Question 1 of 30
The device shown in the illustration which is used for removing moisture from the liquid refrigerant in the system is labeled with what letter? GS-RA-12 Illustration GS-RA-12: the U.S. Coast Guard has not released this illustration.
Browse Questions in Set 4
30 MCQs #1 The device shown in the illustration which is used for removing moisture from the liquid refrigerant in the system is labeled with what letter? GS-RA-12
Illustration GS-RA-12: the U.S. Coast Guard has not released this illustration. #2 Which of the following dehydrators or combination filter/driers features a core that can be replaced when the desiccant becomes saturated with moisture? GS-RA-10 #3 The fluid used as a source of actuating power against the underside of the unloader power element piston of the refrigeration compressor capacity control mechanism illustrated is obtained from where? GS-RA-13
Illustration GS-RA-13: the U.S. Coast Guard has not released this illustration. #4 A box solenoid valve used in a multi-box refrigeration system is operated by electro- magnetic action by what control device? #5 Which of the following electrically operated refrigeration system valves would be most appropriate for use as a 2 position diverting hot gas bypass solenoid valve? GS-RA-19
Illustration GS-RA-19: the U.S. Coast Guard has not released this illustration. #6 Which of the following statements is true? GS-RA-12
Illustration GS-RA-12: the U.S. Coast Guard has not released this illustration. #7 A container unit's microprocessor-controlled temperature controller is set at -28.9 ° C, appropriate for a frozen cargo of ice cream. In this mode of operation, according to the illustrated temperature controller functional diagrams, what should be the operational status of the unit if the actual box temperature is -18.0 ° C? GS-RA-035
Illustration GS-RA-035: the U.S. Coast Guard has not released this illustration. #8 What is the purpose of the low pressure cut-out switch as used as a primary controller for a refrigeration system or unit? #9 As shown in the illustrated refrigeration system piping schematic diagram with the various accessories and controls and equipped with an air-cooled condenser with high side pressure controls, what statement is true concerning the fan cycling control pressure switch? GS-RA-39
Illustration GS-RA-39: the U.S. Coast Guard has not released this illustration. #10 If it is necessary to increase the operating head pressure of the refrigeration system using the device shown in the illustration, what should be done? GS-RA-14
Illustration GS-RA-14: the U.S. Coast Guard has not released this illustration. #11 In a refrigeration system, the valve shown in the illustration is used for what purpose? GS-RA-14
Illustration GS-RA-14: the U.S. Coast Guard has not released this illustration. #12 The set point adjustment of the device shown in the illustration is made by rotating what component? GS-RA-14
Illustration GS-RA-14: the U.S. Coast Guard has not released this illustration. #13 Which of the following illustrated expansion valves is designed to maintain a constant evaporator pressure rather than a constant evaporator superheat? GS-RA-24
Illustration GS-RA-24: the U.S. Coast Guard has not released this illustration. #14 Refrigeration system isolation valves are specially designed with a back-seat, as well as a front-seat. For what purpose are these valves designed in this way? #15 In addition to the indicated gauge pressure, what other information is presented on the compound gauge for the hypothetical refrigerant illustrated? GS-RA-16 #16 Which lettered component, shown in the illustration, indicates the location of the receiver? GS-RA-12
Illustration GS-RA-12: the U.S. Coast Guard has not released this illustration. #17 As shown in the illustrated LP centrifugal chiller pressure maintenance system, what is its functional purpose? GS-RA-40
Illustration GS-RA-40: the U.S. Coast Guard has not released this illustration. #18 What is the purpose of the pressure transducer as shown in the illustration? GS-RA-17
Illustration GS-RA-17: the U.S. Coast Guard has not released this illustration. #19 If the valve labeled "D" in the illustration is a suction service valve, what will the port labeled "7" be connected to? GS-RA-08
Illustration GS-RA-08: the U.S. Coast Guard has not released this illustration. #20 The rupture disc on a low pressure centrifugal refrigeration unit is used as an over pressure protection device and is set to relieve at 15 psig and is most likely to lift when the compressor is idle? Where is the rupture disc located? #21 Which of the lettered components shown in the illustration indicates the high pressure cutout? GS-RA-12
Illustration GS-RA-12: the U.S. Coast Guard has not released this illustration. #22 When the relief valve opens on a refrigeration compressor discharge line, it discharges high pressure refrigerant vapor to what location? #23 Zinc plates commonly found in refrigeration systems and used as sacrificial anodes are located where? #24 Seawater or low temperature central fresh water is typically provided to a ship's stores refrigeration plant for what purpose? #25 Heat is removed from the refrigerant circulating through the refrigeration system, shown in the illustration, by which component? GS-RA-12
Illustration GS-RA-12: the U.S. Coast Guard has not released this illustration. #26 When checking zinc plates, or pencil Zincs in the refrigerating system condenser, what should you do? #27 Through which of the components shown in the illustration is flash gas formation a normal occurrence? GS-RA-25
Illustration GS-RA-25: the U.S. Coast Guard has not released this illustration. #28 In the multi-evaporator refrigeration system shown in the illustration, what is the proper name for the valve labeled "29"? GS-RA-12
Illustration GS-RA-12: the U.S. Coast Guard has not released this illustration. #29 Rather than design an infinite variety of thermostatic expansion valve sizes to accommodate different capacities for heat removal, some manufacturers use a few standard valve body sizes in conjunction with what other feature? #30 Which of the following illustrated expansion valves is designed to maintain a constant evaporator pressure rather than a constant evaporator superheat? GS-RA-24
Illustration GS-RA-24: the U.S. Coast Guard has not released this illustration.
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