Pass Benchmark: 70% • Standard: USCG NMC / 46 CFR
USCG Engine Refrigeration (Supplementary) (Set 3)
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Question 1 of 30
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.
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30 MCQs #1 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. #2 An arrow stamped on the valve body of a water regulating valve indicates which of the following? #3 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. #4 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. #5 Constant superheat is maintained at the evaporator coil outlet of a refrigeration system or unit by the action of what device? #6 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? #7 In addition to the indicated gauge pressure, what other information is presented on the compound gauge for the hypothetical refrigerant illustrated? GS-RA-16 #8 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. #9 During the initial cooling down of a box temperature in a refrigeration system, which of the devices listed is used to prevent excessive gas pressure at the compressor suction for the purpose of prevention of overloading of the compressor driver? #10 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? #11 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. #12 When the relief valve opens on a refrigeration compressor discharge line, it discharges high pressure refrigerant vapor to what location? #13 In the illustrated refrigeration system, what is the proper name for the component labeled "A"? GS-RA-12
Illustration GS-RA-12: the U.S. Coast Guard has not released this illustration. #14 What is the purpose of running a refrigeration compressor in short intermittent spurts or throttling the suction isolation valve when starting the system after a prolonged shutdown? #15 In a refrigeration system, what component is installed directly downstream of the thermal expansion valve? #16 In a dry-type direct expansion refrigeration evaporator, what is true concerning the evaporator coils? #17 Zinc plates commonly found in refrigeration systems and used as sacrificial anodes are located where? #18 Seawater or low temperature central fresh water is typically provided to a ship's stores refrigeration plant for what purpose? #19 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. #20 When checking zinc plates, or pencil Zincs in the refrigerating system condenser, what should you do? #21 If there is a "large" release of R-134a refrigerant gas in a confined area, which of the following statements would be true? #22 Inhalation of high concentrations of chlorofluorocarbon refrigerants (CFCs) may have which of the following effects? #23 The FIRST thing to do to ensure that a refrigeration unit will not start while undergoing repairs is to do what? #24 In the presence of an open flame or hot surfaces, chlorinated fluorocarbon refrigerants decomposes and form what chemical substance? #25 Alkylbenzene ISO 32 cSt synthetic refrigerant oil is miscible and suitable to use with which of the following refrigerants? #26 Which of the following substances is normally classified as a low pressure refrigerant? #27 What is the color coding for a storage container of R-134a refrigerant? #28 In the illustrated refrigeration system, what is the proper name for the component labeled "A"? GS-RA-12
Illustration GS-RA-12: the U.S. Coast Guard has not released this illustration. #29 What is the drive arrangement of refrigeration compressor shown in figure "B" of the illustration? GS-RA-41 #30 If a liquid drying agent is used in a refrigeration system already equipped with a solid drying agent, the liquid drying agent will cause what type of reaction?
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