Engine · 623 questions

Refrigeration AC - USCG Exam Questions

Refrigeration cycles and components, compressors, refrigerants, and marine air conditioning systems.

Every question below is a real U.S. Coast Guard exam question with four choices. Answer one and the correct choice is revealed instantly, with the USCG reference and illustration where the question uses one.

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All Refrigeration AC questions

Questions 601–623 of 623 · page 7 of 7

#1014 Referring to illustrated diagram, what type of HVAC system is shown? Illustration GS-RA-09 illustration
#1015 What common feature is found on both liquid-desiccant and solid-desiccant cargo-hold dehumidification systems?
#1016 In the illustrated terminal reheat multiple zone system, what statement represents the functioning of the summer outside air duct thermostat? Illustra... illustration
#1017 Referring to the illustrated dual duct multiple zone HVAC system, how is the space temperature directly controlled? Illustration GS-RA-43 illustration
#1018 In the illustrated single zone HVAC system, what statement represents the relationship between the exhaust, outside air and recirculation dampers? Ill... illustration
#1019 In the illustrated single zone HVAC system, what prevents the simultaneous flow of steam through the preheat coil and flow of chilled water through th... illustration
#1020 Referring to the illustrated psychrometric chart, under what conditions are the dry bulb, wet bulb, and dew point temperatures for air all equal in va... illustration
#1021 Referring to the illustrated psychrometric chart, suppose during the cooling season that air passes over a cooling coil with a mean surface temperatur... illustration
#1022 Referring to the illustrated psychrometric chart, if the dry bulb temperature is 70oF and the relative humidity is 40%, what is the absolute humidity?... illustration
#1023 Referring to the illustrated psychrometric chart, suppose air at a dry-bulb temperature of 60oF and a relative humidity of 52% passes over a heating c... illustration
#1024 Which of the following thermometers provides a remote display of temperature on a rotary dial scale and works on the principle of thermal expansion?
#1025 In a two-stage centrifugal air conditioning system such as the one illustrated, the liquid refrigerant passes from the condenser directly to what comp... illustration
#1026 By what criteria are hard hats (protective helmets) rated?
#1027 In a refrigeration system, once the gauge manifold hoses are attached to the compressor service valve connections and properly purged, what should be...
#1028 What could be the cause of water hammer in a steam heating system?
#1029 Personnel servicing refrigeration systems and subject to exposure to commonly used refrigerants should wear what type of personal protective equipment...
#1030 The illustrated hydraulic pump graphic symbol is used to depict a __________. illustration
#1031 A digital multimeter is set up as an ohmmeter. What does a display reading of "OL" ohms as read across the ends of a wire conductor indicate?
#1032 The minimum length of dimension "C" shown in the illustration is __________. illustration
#1033 An evaporator coil of a single evaporator, air-cooled refrigerator is accumulating excessive frost due to a failure of the defrost mechanism. If the r...
#1034 Which of the following illustrated expansion valves is designed to maintain a constant evaporator pressure rather than a constant evaporator superheat... illustration
#1035 The designation '1/4-20' describes __________.
#1036 In the illustrated DC machine, which is configured as a generator, what is the purpose of the interpoles? illustration

Refrigeration AC questions: what to expect

Q How many Refrigeration AC questions are in the Engine pool?

There are 623 Refrigeration AC questions on this site, every one released by the U.S. Coast Guard or taken from the National Maritime Center's sample examinations, with its correct answer. The exam draws its Refrigeration AC module from the same pool.

Q What score do I need to pass the Refrigeration AC module?

Most USCG exam modules, including Refrigeration AC, require 70 percent to pass. Rules of the Road modules require 90 percent.

Q Are these the real USCG Refrigeration AC exam questions?

Yes. They are the published U.S. Coast Guard questions, matched to the National Maritime Center's 2026 sample examinations. Answer any question to see the correct choice, the USCG reference and the illustration where the question uses one.

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The Engine pool holds the current U.S. Coast Guard questions for engineering credentials, from QMED ratings through DDE and Assistant Engineer up to Chief. Answer any question to see the correct choice instantly.