Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR
USCG Refrigeration & Air Conditioning (Set 15)
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Question 1 of 30
EPA Clean Air Act rules permit refrigerant to be released to the atmosphere under which of the following conditions?
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30 MCQs #1 EPA Clean Air Act rules permit refrigerant to be released to the atmosphere under which of the following conditions? #2 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? #3 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? #4 What would be an example of a small appliance as defined in the EPA Clean Air Act rules? #5 Persons recovering refrigerant from small appliances must be certified as what type of technician under the EPA Clean Air Act rules? #6 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? #7 Which best defines a "Type I" small refrigeration appliance according to the EPA Regulations Section 608? #8 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? #9 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? #10 As shown in the illustrated LP centrifugal chiller high efficiency purge recovery unit piping schematic, what statement is true concerning the vacuum pump? Illustration GS-RA-55
Illustration GS-RA-55: the U.S. Coast Guard has not released this illustration. #11 The air temperature associated with a direct reciprocating air conditioning plant is found to be too warm, and the compressor is not operating. A service check determines the compressor suction pressure to be above the normal cut-in point, with a normal head pressure, and high evaporator superheat. Which of the following could be the cause of this problem? #12 In an air conditioning system, low discharge head pressure associated with a reciprocating compressor can be the result of what condition? #13 The surging that occurs in a centrifugal air conditioning compressor is a result of what conditions? #14 A reciprocating multi-cylinder air conditioning or refrigeration compressor starts cycling on/off. What would one do to prevent cycling? #15 While troubleshooting intermittent failures of the ship service refrigeration system you suspect the problem is with the lube oil pressure differential switch. The recommended course of action would be: #16 The compressor on the ships service refrigeration system starts up but stops after a brief period of running. Subsequent attempts to start it produce no result. What control component would you suspect? #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 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? #20 According to 46 CFR, Part 58, for protection purposes, what is required of all refrigeration systems? #21 While recharging a commercial type refrigerator, with a hermetically sealed compressor with no pressure gauges, what could you use or do to achieve a proper full charge? #22 Which of the illustrated valves is used to gain access to a hermetically sealed system and features a Schrader core valve which is unseated by the core depressor of the hose fitting when attached? Illustration GS-RA-67
Illustration GS-RA-67: the U.S. Coast Guard has not released this illustration. #23 You have completed repairs to a small galley refrigerator which uses a capillary tube and a hermetic compressor. The repairs required complete evacuation of the refrigerant and you find that you do not have a proper scale to weighing the amount of refrigerant you will recharge into the system. As the unit is critical to galley operations you must try and restore it to service. The most prudent course of action would be to do which of the following? #24 Referring to illustrated diagram, what type of HVAC system is shown? Illustration GS-RA-42
Illustration GS-RA-42: the U.S. Coast Guard has not released this illustration. #25 Referring to the illustrated single zone HVAC system diagram, what statement is true concerning the damper controls? Illustration GS-RA-09
Illustration GS-RA-09: the U.S. Coast Guard has not released this illustration. #26 The set point adjustment of the device shown in the illustration is made by rotating what component? Illustration GS-RA-14
Illustration GS-RA-14: the U.S. Coast Guard has not released this illustration. #27 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? Illustration GS-RA-39
Illustration GS-RA-39: the U.S. Coast Guard has not released this illustration. #28 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? Illustration GS-RA-14
Illustration GS-RA-14: the U.S. Coast Guard has not released this illustration. #29 Excessive moisture being collected in the purge unit of a low-pressure refrigeration system could indicate which probable condition? #30 With a service gauge manifold set connected to a refrigerant compressor as shown in the illustration, which arrangement of the gauge manifold set valves and compressor service valves would allow for simultaneous reading of the compressor suction and discharge pressures? Illustration GS-RA-03
Illustration GS-RA-03: the U.S. Coast Guard has not released this illustration.
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