ABYC Air Conditioning & Refrigeration Certification Practice Exam

Browse all practice questions for the ABYC Air Conditioning & Refrigeration Certification Practice Exam. Search by topic, open any question and review its full explanation, then test yourself in the practice quiz.

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Convection is the heat transfer that moves fluids and carries thermal energy in heating and cooling systemsWhat type of heat transfer occurs due to the movement of fluids?How long does it take to fully evacuate a small A/C system with a dual-stage vacuum pumpUsing a high-quality dual-stage vacuum pump, how long will it take to fully evacuate a small A/C system?How to Decrease Resistance Between MT1 and MT2 Terminals in a TRIACTo decrease the measured resistance between the MT1 and MT2 terminals of a TRIAC, which terminals should be connected?Learn the Best Ways to Secure Supply Air Ducts EffectivelyWhat is the proper way to secure supply air ducts?Phosgene Gas Risks in Refrigeration Systems: What You Need to KnowPhosgene gas can be produced in a refrigeration system by which action?The Real Impact of a Dirty Filter on Refrigeration SystemsWhat is the effect of a dirty filter in a refrigeration system?Understanding Air-Cooled Condenser Problems and Compressor Head PressureWhat issue can result from air in the condenser or dust-clogged fins in an air-cooled condenser?Understanding BTUs: Heating Your Aquarium and Air Conditioning InsightsHow many BTUs would it take to raise the temperature of my aquarium (25 gallons) from 60 degrees to 72 degrees?Understanding Compressor Noises: What Does a Knocking Sound Mean?What is the most likely cause when a knocking sound is heard and the compressor is non-functional?Understanding Enthalpy and Its Role in HVAC SystemsWhat is the term for the total amount of heat in one pound of a substance, expressed in BTU's per mass?Understanding Heat Transfer: Convection, Conduction, and Radiation ExplainedWhat term describes the process of heat transfer through radiation?Understanding Latent Heat in Air Conditioning and Refrigeration SystemsThe heat required to change a liquid into a vapor is called _____ heat.Understanding Latent Heat in HVAC ConceptsWhat is the term for the amount of heat energy that must be removed to change 1 lb of solid into 1 lb of liquid?Understanding Latent Heat of Vaporization in Refrigeration SystemsHow much heat energy is needed to change 1 lb of liquid into 1 lb of vapor at the same temperature?Understanding Mean Temperature Differences in Heat ExchangeWhat calculates the mean difference between the temperature of a fluid receiving heat and a fluid yielding heat?Understanding Refrigerant Migration in Air Conditioning SystemsWhat phenomenon causes refrigerant to move through the system to the compressor crankcase during the off-cycle?Understanding Seawater Flow Rates for Marine Air Conditioning SystemsHow many gallons of sea water flow are queried for every 12,000 BTU's (1 Ton) of air conditioning?Understanding Static Pressure and Its Role in HVAC SystemsWhich term refers to the normal force per unit area at a small hole in a duct wall?Understanding the Critical Role of the Evaporator in Refrigeration CyclesIn a refrigeration cycle, the evaporator's role is to:Understanding the Environmental Impact of R-22 in Air Conditioning and RefrigerationWhich refrigerant is especially known for being phased out due to environmental concerns?Understanding the Essential Role of the Four-Way Valve in Heat PumpsWhat is the significance of the 'four way valve' in heat pump systems?Understanding the Function of a Hard Start Kit in HVAC SystemsThe purpose of a hard start kit is to:Understanding the Impact of Excessive Bends in Air DuctingWhat is the likely result of excessive bends in air ducting?Understanding the Impact of Oil Around Refrigerant Fittings in Air Conditioning SystemsWhat could be indicated by observing oil around refrigerant fittings?Understanding the Importance of Oil Level in Dual-Stage Vacuum PumpsWhat should be checked regularly to maintain a dual-stage vacuum pump's performance?Understanding the K Factor in Heat Transmission and Energy EfficiencyWhat term describes the coefficient of heat transmission in BTU, per area, per thickness, per temperature delta per time?Understanding the Latent Heat of Fusion for Freshwater IceWhat is the latent heat of fusion for freshwater ice?Understanding the Location and Function of the Low-Pressure Cutout SwitchWhere would you find the low-pressure cutout switch?Understanding the Sublimation Process in Air Conditioning and RefrigerationWhat process involves changing from a solid to a gas without becoming a liquid?Understanding the wiring of a KLIXON overload protection device with a motorHow should a typical 2-pin KLIXON overload protection device be wired with the motor's common terminal?What Safety Precautions Should You Take When Working with Refrigerants?What is a safety precaution when working with refrigerants in enclosed spaces?Why a suction line accumulator protects a compressor in marine air conditioning and refrigeration systemsWhat device is used to intercept liquid refrigerant in the suction line to protect the compressor?
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  • What is the function of a receiver in a refrigeration system?
  • What air movement is standard for heat pumps?
  • What process is critical for the maintenance of an AC system involving refrigerant?
  • What is the effect of high or low voltage on a sealed compressor?
  • What is the term for a vapor in contact with a liquid?
  • What component is critical for preventing backflow in an A/C system?
  • A direct-acting low-pressure switch opens its contacts on?
  • What does sub-cooling refer to in refrigeration?
  • What term is used to describe a refrigerant's moisture content monitoring device within a sight glass?
  • What term describes the temperature at which heat removal initiates a phase change from vapor to liquid?
  • At what height should A/C discharge ducts be located within a cabin?
  • When charging an A/C system through the low-side service valve, what should the valve stem position be?
  • Which type of pump is known to be self-priming?
  • What condition is detected when an A/C system struggles to maintain set temperatures?
  • What component is responsible for controlling the flow rate of refrigerant into the evaporator?
  • How must air handling units installed at floor level discharge air?
  • To convert Watts into BTUs, by what factor should Watts be multiplied?
  • A TRIAC is:
  • True or False: An empty refrigerant container can be used as a recovery container if only one type of refrigerant is stored.
  • Which term describes a condition of stable equilibrium of vapor and liquid?
  • What is the heat added to a vapor by the work done on it during compression called?
  • Which type of heat can a technician physically feel during their work?
  • What should be done immediately if refrigerant gets in your eye?
  • What is the most common problem with marine electrical wiring?
  • How often should a sea-strainer be cleaned?
  • What kind of heat produces a change in state without a change in temperature?
  • Food refrigerators are designed to maintain temperatures of _____ degrees F.
  • What is the minimal distance on the outside of the hull between A/C condensate discharge outlet and engine exhaust outlet?
  • What is the energy required to melt a 1-ton block of freshwater ice in 24 hours?
  • If ten pounds of refrigerant gives up 20 BTUs of heat per pound in a water-cooled condenser, what is the leaving water temperature if the incoming water is at 80 degrees F?
  • Which temperature scale uses absolute zero as a reference?
  • What is the term used for heat added to a vapor after all the liquid has been vaporized?
  • What type of valves is best for a thru-hull installation?
  • What is referred to as the vertical tube that carries refrigerant from a lower to a higher level?
  • Which type of heat transfer does not require a medium (e.g., air or water)?
  • What is the correct air discharge point for floor-mounted air handling units?
  • In a refrigeration system, what is meant by "static pressure"?
  • What toxic gas is produced as a result of burning freon?
  • Which device uses both a dry and wet bulb thermometer to determine relative humidity?
  • What is the primary function of a metering device in a refrigeration system?
  • What is the primary role of a contactor in an air conditioning system?
  • In a refrigeration system, what does superheat refer to?
  • Which is a potential environmental effect of refrigerant leaks?
  • What term describes heat transfer without an intervening medium?
  • On which side of a compressor is the low pressure switch located, and what does it do?
  • Which device acts as a safety mechanism by intercepting liquid refrigerant before it reaches the compressor?
  • Which windings of a motor will indicate the highest ohms readings?
  • Why is it not advisable to oversize an A/C system?
  • What is defined as the transfer of heat by the movement of fluids or air?
  • In the context of HVAC systems, what does the term "total heat" refer to?
  • What does MBH stand for in relation to heat measurement?
  • When is it acceptable for items like blowers and fans to be unprotected?
  • What is an electromagnetic relay that typically closes the circuit to the compressor called?
  • What is the function of superheat in a refrigeration system?
  • Which type of refrigerant is most commonly used today due to its low environmental impact?
  • How is the volume of a substance per unit mass defined?
  • What is the term for the weight of water vapor in a given amount of air?
  • A customer reports that the cabin is too cold while the A/C system is running continuously. What is a likely cause?
  • Compressors have large in-rush currents and therefore rely on a start relay, commonly called a?
  • Which winding of a motor is most likely to indicate the highest ohms reading?
  • What is the correct order for pumping down a refrigeration system?
  • Hard start kits would have what components?
  • A _______ might indicate a sign of system blockage.
  • Which of the following can be a major consequence of a leaking A/C system?
  • A technician notices air bubbles visible through the clear section of a raw-water sea strainer. What is the most likely cause?
  • What is the recommended action for a plugged air filter in an A/C system?
  • Where should condensate drains from evaporators not terminate?
  • Why is it important to maintain proper air flow in refrigeration systems?
  • What is the portion of a refrigeration system where compression and condensation occurs?
  • What is defined as the sum of all partial pressures in a mixture of gases?
  • If an electrical pump is installed on an A/C system, what type of rating is required?
  • What type of equipment should boats have to ensure safe usage of electrical components in A/C systems?
  • Which component controls the flow rate based on the superheat at the evaporator outlet?
  • What is a common cause of motor winding insulation breakdown?
  • What is the function of a vapor barrier in insulation?
  • What are some possible manifestations from an overly dirty A/C air filter?
  • Which part of a refrigeration system is responsible for removing heat from the refrigerant?
  • What device on a heat pump reverses the flow of refrigerant when switching between cooling and heating?
  • How many microns equal one inch of mercury vacuum?
  • Why should A/C condensate drain hose not be discharged into the engine room bilge area?
  • Is it permissible to recover multiple types of refrigerant gases in a single recovery cylinder?
  • In what direction should thru-hull scoops for A/C cooling water face?
  • What aspect of A/C maintenance is vital to prevent corrosion?
  • What is likely to be the issue if low suction and discharge pressure are found, but high superheat and partial frosting on the evaporator unit are present?
  • Which device is commonly used for overcurrent protection in HVAC systems?
  • Which term describes the actual temperature of refrigerant vapor at the evaporator exit compared to the saturated vapor temperature?
  • What is the term for pressure measured with a base of zero?
  • Items such as blowers and fans must be shrouded, covered, caged, or otherwise protected unless?
  • Which component is critical for the proper function of a refrigeration system during the cooling cycle?
  • Which statement about the windings of a motor is correct?
  • Why must an A/C system be evacuated before brazing?
  • What type of air ducts are most common in AC systems?
  • What size air ducts would be used with a 12,000 BTU/hr unit?
  • On marine AC systems, return air ducts should be?
  • In what direction should the slots of a thru-hull scoop be oriented on a powerboat?
  • What is the impact of small air ducts in a cooling system?
  • In what type of boat should A/C condensate not be drained directly into the bilge?
  • Refrigeration lines should be secured every how many inches?
  • What is Absolute Zero in Celsius?
  • What might cause very small pin-hole leakage near the output fitting of a metallic-body centrifugal cooling water pump?
  • What is a common indication that a refrigeration system is overcharged?
  • Approximately how many BTUs of A/C can a standard 120V 30A circuit produce?
  • What is the best tool for checking the windings of a compressor?
  • What temperature range is recommended for a food refrigerator?
  • What is the main purpose of the expansion valve in a refrigeration system?
  • What is the significance of the standard air density of 0.075 lbs/ft³?
  • What does a low pressure reading on the suction side of a system typically indicate?
  • What is the purpose of a trap in refrigerant piping?
  • What type of heat exchanger absorbs latent heat energy and converts refrigerant gas into liquid?
  • What is the amount of heat required to change 1 lb of vapor into 1 lb of liquid at the same temperature known as?
  • When installing a reverse-cycle AC unit below the waterline, the best option for the condensation drain is:
  • What is a common symptom indicating a refrigerant leak in a system?
  • What is the term for any pressure below atmospheric pressure?
  • Which heat transition involves converting a solid directly into a vapor?
  • If a vessel doesn't have a thru-hull for an AC unit on a new install, what should the technician do?
  • Why is nitrogen gas used inside copper tubing when brazing?
  • What is the purpose of a crankcase heater in a refrigeration system?
  • Which location is acceptable for air ducting to be installed in a vessel?
  • After how many years may a refrigerant recovery cylinder be used without needing to be re-tested?
  • What is the correct sequence for evacuating an A/C system?
  • What term describes the decrease in pressure due to friction of a fluid or vapor as it passes through a tube or duct?
  • What is the minimum pull-test requirement for friction-type electrical connectors?
  • What is the order of refrigerant flow beginning with the compressor?
  • What component is typically found on the suction side of a compressor?
  • What does COP stand for in relation to refrigeration systems?
  • What condition is referred to when insufficient airflow causes refrigerant temperature to drop below the freezing point?
  • What causes a direct-acting low-pressure switch to open its contacts?
  • What is a common indication of an internal blockage in refrigerant flow?
  • What is a psychrometric chart used for?
  • What are the typical pressure and temperature values of refrigerant on the high-side and low-side of the metering valve?
  • The recommended sea-water flow, per ton of cooling is GPH:
  • The high-pressure safety control protects which component?
  • When calculating power draw for a motor, what does Tech B suggest should be included for accuracy?
  • What is a common indication of a malfunctioning A/C compressor?
  • Which component removes heat from the refrigerant and which allows it to take on heat?
  • What is the minimum hose size that should be used for condensation drains?
  • What does a trip on the thermal overload device indicate?
  • How often should the oil in a dual-stage vacuum pump be changed?
  • What is the maximum height above waterline for cooling water to exit the thru-hull?
  • What is the amount of heat necessary to change the temperature of 1 pound of a substance by 10 degrees F called?
  • How much larger should an air conditioning return duct be compared to the discharge duct?
  • What happens during a runaway condition in a refrigeration system?
  • What is another name for a start relay used in HVAC systems?
  • How may a compressor intake valve leak be determined?
  • What condition may be indicated by icing of an evaporator and excessive time needed to equalize high and low side system pressures?
  • What is one method used to verify if an A/C system is properly charged?
  • When phasing out R-22, which of the following gases does NOT cause serious damage?
  • What is the primary purpose of a suction line accumulator in an HVAC system?
  • What effect does running a motor at lower than rated voltage have?
  • What is a trademarked device used for compressor overload protection in HVAC systems?
  • Which term best describes the property that represents how much heat a substance can store per unit mass?
  • How many hours is it recommended to allow a high-quality vacuum pump to operate for air conditioning evacuation?
  • How can a leak in a compressor intake valve be identified?
  • Potential relays are often used in reverse cycle units; what is true about them?
  • What happens to the compressor capacity when suction pressure decreases?
  • What type of pressure can be described as the pressure of the refrigerant within the system?
  • Which term refers to the transfer of heat through direct contact within a substance?
  • What device is a resistance heater in parallel with the cooling circuit used for?
  • The capacity of a reciprocating compressor will:
  • What is the purpose of a pumpdown in a refrigeration system?
  • Air handling units installed at floor level must be ducted to discharge air?
  • In a refrigeration cycle, what is the function of the condenser?
  • All of the following are symptoms of a refrigerant leak EXCEPT:
  • At what height should A/C return duct sources be located in the cabin?
  • What does the term "Evaporator Superheat" refer to in air conditioning?
  • What is the ideal height above waterline for cooling water to exit the thru-hull?
  • What is the equivalent in Watts of 1 BTU per hour?
  • What term refers to the amount of heat energy needed to convert 1 lb of liquid into 1 lb of solid at the same temperature?
  • What is the standard amount of air movement through the indoor coil of a heat pump?
  • What effect do plugged air filters have on a system?
  • What is the standard air density value at sea level and at 700°F?
  • What are possible causes for a slow, steady rise on the micron gauge during evacuation?
  • In a start relay, are the contacts normally open or closed when the system is off?
  • If air bubbles are constantly present in the strainer, what is the most likely cause?
  • At what percentage of total capacity is a recovery storage container considered "Full"?
  • What is the role of the high pressure switch in a compressor?
  • Where should the condensate drain be directed for an air conditioning system installed at the waterline in a wooden powerboat?
  • What is the minimum diameter recommended for A/C condensate drain hose?
  • Which device could be used in conjunction with a static tap to measure pressure differences in a duct?
  • What is the standard measure for BTU's in relation to refrigeration systems?
  • What is the primary function of a compressor in a refrigeration system?
  • What is the role of an evaporator in a refrigeration cycle?
  • Which connection type is considered the most dependable for refrigerant piping?
  • What happens to the refrigerant in the evaporator?
  • An S.A.E flare fitting features a shoulder with what angle?
  • What device is used to visually detect vapor in the liquid line of a refrigerant?
  • Which process requires energy removal for a vapor to condense into a liquid?
  • What is the primary role of a solenoid valve in a refrigeration circuit during the pumpdown process?
  • Which type of pump is most commonly used for seawater condenser cooling?
  • Capacitors must be within what percentage if you need to replace them?
  • What is the consequence of not flushing refrigerant from the eye immediately?
  • During routine maintenance, what should a technician check to ensure system efficiency?
  • True or False: Many A/C manufacturers specify device cooling capacity based on an evaporator temperature of 100 F.
  • What might cause an AC system to cycle on and off frequently?
  • True or False: It is fairly easy to lose 50% of a pump's rated capacity due to bends and lengths of plumbing.
  • How should air ducting be configured for optimal performance?
  • What is defined as the pressure in a moving fluid that can convert pressure energy into kinetic energy?
  • In a refrigeration cycle, what is the effect of a pressure drop occurring in the evaporator?
  • What is a Klixon?
  • What is the maximum distance between support clamps for refrigerant piping?
  • How should drains from wooden boats be handled?
  • What is a static tap used for in a duct system?
  • When can equipment like blowers and fans be installed without protective measures?
  • Which standard should technicians reference for piping?
  • What component in an air conditioning system absorbs latent heat to cool the exit air?
  • What may occur if voltage to a single-phase sealed compressor is too low or high?
  • Which factor is critical for a technician when installing a marine refrigeration unit?
  • Superheat can be defined as:
  • What does 'latent heat' refer to in a refrigeration context?
  • What is the equation that describes total heat energy in a substance?
  • True or False: Refrigerants are generally heavier than air, necessitating ventilation caution in enclosed spaces.
  • Which component is primarily responsible for removing heat from a refrigerant in a marine AC system?
  • How many BTUs are required to melt one pound of ice?
  • Which term best defines the measure of heat energy associated with a phase change of a substance?
  • What should be used to ensure that return air is not sourced from the engine room?
  • What term refers to the heat absorbed by a refrigerant as it changes from liquid to vapor at a given pressure?
  • What is the definition of a BTU?
  • What happens when an A/C system is overcharged?
  • What is the range of temperatures at which a 15 percent silver alloy brazing material will flow?
  • Which of the following best describes superheat?
  • How often should supply air ducts be checked for security?
  • True or False: Although ABYC does not require double hose clamping on thru-hull seacocks, ISO standards and many manufacturers do recommend it.
  • How many BTUs per hour is equal to 1 Watt?
  • What could cause thermal overload device to trip on an A/C system?
  • By approximately how much does a start capacitor increase motor torque?
  • What is the average BTU output of a 1-ton refrigeration system?
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