Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR
USCG Refrigeration & Air Conditioning (Set 17)
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Question 1 of 30
Which of the illustrated valves is used to gain access to a hermetic system and features a Schrader core valve which is unseated by the core depressor of hose fitting when attached? Illustration GS-RA-69 Illustration GS-RA-69: the U.S. Coast Guard has not released this illustration.
Browse Questions in Set 17
30 MCQs #1 Which of the illustrated valves is used to gain access to a hermetic system and features a Schrader core valve which is unseated by the core depressor of hose fitting when attached? Illustration GS-RA-69
Illustration GS-RA-69: the U.S. Coast Guard has not released this illustration. #2 Which of the illustrated devices would be the LEAST accurate for the purposes of weighing-in a refrigerant charge? Illustration GS-RA-45 #3 Which of the following illustrated expansion valves is designed to maintain a constant evaporator pressure rather than a constant evaporator superheat? Illustration GS-RA-24
Illustration GS-RA-24: the U.S. Coast Guard has not released this illustration. #4 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? Illustration GS-RA-13
Illustration GS-RA-13: the U.S. Coast Guard has not released this illustration. #5 Why is a purge recovery unit typically fitted on low-pressure centrifugal chillers? #6 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? #7 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? #8 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. #9 In a refrigeration system, the valve shown in the illustration is used for what purpose? Illustration GS-RA-14
Illustration GS-RA-14: the U.S. Coast Guard has not released this illustration. #10 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. #11 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. #12 If the valve labeled "D" in the illustration is a suction service valve, what will the port labeled "7" be connected to? Illustration GS-RA-08
Illustration GS-RA-08: the U.S. Coast Guard has not released this illustration. #13 Refrigeration system isolation valves are specially designed with a backseat, as well as a front seat. For what purpose are these valves designed in this way? #14 In addition to the indicated gauge pressure, what other information is presented on the compound gauge for the hypothetical refrigerant illustrated? Illustration GS-RA-16 #15 What is the purpose of the pressure transducer as shown in the illustration? Illustration GS-RA-17
Illustration GS-RA-17: the U.S. Coast Guard has not released this illustration. #16 Which lettered component, shown in the illustration, indicates the location of the receiver? Illustration GS-RA-12
Illustration GS-RA-12: the U.S. Coast Guard has not released this illustration. #17 During normal operation, traditionally, how has most of the refrigerant released to the atmosphere from low-pressure systems? #18 The device shown in the illustration which is used for removing moisture from the liquid refrigerant in the system is labeled with what letter? Illustration GS-RA-12
Illustration GS-RA-12: the U.S. Coast Guard has not released this illustration. #19 Which of the following dehydrators or combination filter/driers features a core that can be replaced when the desiccant becomes saturated with moisture? Illustration GS-RA-10 #20 In the illustrated refrigeration system, what is the proper name for the component labeled "A"? Illustration GS-RA-12
Illustration GS-RA-12: the U.S. Coast Guard has not released this illustration. #21 What is the drive arrangement of refrigeration compressor shown in figure "B" of the illustration? Illustration GS-RA-41 #22 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? Illustration GS-RA-01 #23 After the refrigerant has been recovered, leaks repaired if necessary, the system ideally should undergo a dehydration evacuation prior to recharging with refrigerant. As shown in the illustration, besides the vacuum pump suction manifold isolation valve being opened, what would be the proper valve positions to accomplish and prove the evacuation? Illustration GS-RA-51
Illustration GS-RA-51: the U.S. Coast Guard has not released this illustration. #24 Which of the following is true concerning the class "D" air conditioning system shown in the following illustration? Illustration GS-RA-42
Illustration GS-RA-42: the U.S. Coast Guard has not released this illustration. #25 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. #26 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? #27 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? Illustration GS-RA-28
Illustration GS-RA-28: the U.S. Coast Guard has not released this illustration. #28 If the evaporator coil horizontal return line of a container refrigeration system is less than 0.875" (2.21 cm) in diameter (considered small); the thermostatic expansion valve sensing bulb should be attached where on the return line? #29 Which of the listed statements describes the method used to determine the amount of superheat present in the suction gas leaving the evaporator coil? Illustration GS-RA-16 #30 Of the various possible methods shown in the illustration, which is the correct method of attaching a TXV feeler bulb to a small large line (7/8" and larger) with a horizontal run? Illustration GS-RA-50
Illustration GS-RA-50: the U.S. Coast Guard has not released this illustration.
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