Pass Benchmark: 70% • Standard: USCG NMC / 46 CFR
USCG Engine Refrigeration (Supplementary) (Set 8)
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Question 1 of 30
Excessive moisture being collected in the purge unit of a low pressure refrigeration system could indicate which probable condition?
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30 MCQs #1 Excessive moisture being collected in the purge unit of a low pressure refrigeration system could indicate which probable condition? #2 Minor repairs may be performed on low pressure refrigerant systems without recovering the refrigerant charge if the pressure in the system is raised to atmospheric. How may this be accomplished? #3 The most cost-effective method of recovering refrigerant from a low pressure chiller with more than 500 lbs of refrigerant and to meet EPA requirements is to recover the refrigerant using what protocol? #4 As shown in the illustrated flow diagram for a self-contained recovery unit designed for the recovery of refrigerants from high pressure appliances as defined by the EPA Clean Air Act rules, what is the functional purpose of the item labeled "FS2"? GS-RA-32
Illustration GS-RA-32: the U.S. Coast Guard has not released this illustration. #5 Using the device shown in the illustration, which of the following statements is true when adding refrigerant as a vapor to the low side of the refrigeration system. GS-RA-01 #6 Personnel servicing refrigeration systems and subject to the exposure to commonly used refrigerants should wear what type of personal protective equipment? #7 In the presence of an open flame or hot surfaces, chlorinated fluorocarbon refrigerants decomposes and form what chemical substance? #8 When opening or closing compressor service and line isolation valves on a typical refrigeration system that is fitted with packed valves, what must you do? #9 When pumping down an air conditioning system to test the low pressure cutout switch, assuming that the compressor is running, what should be done to initiate the test? #10 When recovering the remaining R-134a refrigerant from the centrifugal chiller shown in the illustration as a vapor using the recovery unit's compressor, in addition to opening valves "1a", "1b", and the compressor suction and discharge isolation valves, which of the following would be the correct valve lineup? See Illustration GS-RA-28
Illustration GS-RA-28: the U.S. Coast Guard has not released this illustration. #11 The compressor used in a water-cooled air conditioning system is short cycling. A service check determines that the suction pressure remains above the normal cut-in point during cycling and that the discharge pressure rapidly builds up to the cut-out point while running and gradually falls to the cut-in point during the off cycle. What is likely the cause? #12 Using the illustrated chart giving the boiling point of moisture at various depths of vacuum, with an ambient temperature of 72 °F, what depth of vacuum would be associated with the BEST chance of achieving a dehydration evacuation with a deep vacuum pump? Illustration GS-RA-56
Illustration GS-RA-56: the U.S. Coast Guard has not released this illustration. #13 The surging that occurs in a centrifugal air conditioning compressor is a result of what conditions? #14 In an air conditioning system, low discharge head pressure associated with a reciprocating compressor can be the result of what condition? #15 Coast Guard Regulations (46 CFR Part 58) require a method for the relieving pressure of an over pressurized refrigeration system. Which of the following statements complies with these Regulations? #16 Coast Guard Regulations (46 CFR Part 113) require refrigerated spaces that can be locked from the outside and that cannot be opened from the inside to have an audible alarm. Where is the audible alarm required to be? #17 With regards to shipboard refrigeration systems, after July 1, 1992, what action became illegal? #18 Refillable tanks used to ship CFC and HCFC refrigerants or used to recover these refrigerants must meet the standards of what entity? #19 According to 46 CFR, Part 58, for protection purposes, what is required of all refrigeration systems? #20 What would be an example of a small appliance as defined in the EPA Clean Air Act rules? #21 Which best defines a "Type I" small refrigeration appliance according to the EPA Regulations Section 608? #22 If you find the pressure of a refrigeration system containing a Class I or Class II refrigerant to be opened for the accomplishment of repairs is 0 psig, what must be done? #23 EPA Clean Air Act rules permit refrigerant to be released to the atmosphere under which of the following conditions? #24 All shipboard personnel responsible for the maintenance and repair of air conditioning systems using refrigerants covered under the EPA Clean Air Act venting prohibition, must be certified through an approved Environmental Protection Agency (EPA) program to do which of the following? #25 When recovering R-12 from a small appliance with a working compressor, using a recovery device manufactured after November 15, 1993, what percentage of the remaining charge must be removed from the system? #26 Persons recovering refrigerant from small appliances must be certified as what type of technician under the EPA Clean Air Act rules? #27 According to the EPA Clean Air Act rules, what is true concerning refrigerant leaks in a small hermetically sealed shipboard water cooler with a 20 ounce charge weight? #28 Within the territorial limits of the United States, violations of the Clean Air Act of 1990, that includes the intentional release of R-11, R-12, R-22 and other related class I or class II substances may result in fines for each violation per day of what amount? #29 Referring to illustrated diagram, what type of HVAC system is shown? GS-RA-09
Illustration GS-RA-09: the U.S. Coast Guard has not released this illustration. #30 Referring to illustrated diagram, what type of HVAC system is shown? GS-RA-42
Illustration GS-RA-42: the U.S. Coast Guard has not released this illustration.
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