Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR
USCG Refrigeration & Air Conditioning (Set 7)
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Question 1 of 30
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?
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30 MCQs #1 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? #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 Persons recovering refrigerant from small appliances must be certified as what type of technician under the EPA Clean Air Act rules? #4 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? #5 For safe storage, the maximum allowable temperature to which refrigerant bottles should be exposed is what temperature? #6 Overfilling a refrigerant container is extremely dangerous because of the high pressures generated. The generation of pressure is the result of what? #7 Personnel servicing refrigeration systems and subject to the exposure to commonly used refrigerants should wear what type of personal protective equipment? #8 Why can CFC or HCFC refrigerants leaking into a confined space or in limited surroundings cause suffocation? #9 When repairing a refrigeration system, a swaging tool set would be used to carry out which of the following operations? #10 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? #11 When starting a reciprocating refrigeration compressor that has been shut down for a period of time, you should manually throttle which valve? #12 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? #13 In an air conditioning system, what is the name of the chamber where the duct-work originates? #14 In a two stage centrifugal air conditioning system, the liquid refrigerant passes through the condenser directly to what component? #15 A reheater in an air conditioning system performs what function? #16 What is one benefit of Maintenance of proper air circulation in an air conditioned cargo space? #17 What is the wet bulb temperature of air if the dry bulb temperature of the air is 90 degrees and the relative humidity is 65%? Illustration GS-RA-22
Illustration GS-RA-22: the U.S. Coast Guard has not released this illustration. #18 In general, the thermal bulb for a thermal expansion valve used in a reciprocating air conditioning system is usually charged with what substance? #19 To prevent the unnecessary loading of an air conditioning system while maintaining the designed dry bulb temperature and relative humidity in an air conditioning system, what should be done? #20 Which of the following methods is normally used to control the circulated air temperature of an air conditioning system using chilled water circulation? #21 For the proper control of the air temperature in an air conditioning system using chilled water circulation, which of the listed conditions should remain constant regardless of load changes? #22 Which of the processes listed would be the most satisfactory method to use to lower the humidity of the air being circulated by an air conditioning system? #23 A room humidistat initiates the lowering of the humidity of the conditioned supply air to a space, while the actual process is accomplished by what means? #24 In an air conditioning system, moisture is removed from the air by what means? #25 If outside air at 80 degrees F and 70 percent relative humidity is conditioned, what will be the resulting dew point temperature of the air just before it comes into contact with the cooling coil? Illustration GS-RA-22
Illustration GS-RA-22: the U.S. Coast Guard has not released this illustration. #26 Which of the following is true concerning the class "A" air conditioning system shown in the illustration as used to condition the air of large public spaces? Illustration GS-RA-09
Illustration GS-RA-09: the U.S. Coast Guard has not released this illustration. #27 Concerning the arrangement of equipment and associated hoses shown in the illustration, what statement is true? Illustration GS-RA-59
Illustration GS-RA-59: the U.S. Coast Guard has not released this illustration. #28 To add small amounts of refrigerant to the low side of an air conditioning system, the refrigerant should be introduced through a particular valve and in a particular state. What valve and state combination is correct? #29 To add refrigerant to the high side of an air conditioning system, you should close the king valve and introduce the refrigerant through what valve in what state? #30 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?
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