ABYC Systems Certification Practice Exam

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• What may happen to an air-conditioner starting capacitor if it is exposed to constant line voltage?
• What is the effect of using wire sizes that are too small in a marine electrical system?
• Is a standard household-type relief valve suitable for hot water tanks?
• Where should an accumulator tank be located in a potable water system?
• At what percentage of nominal working pressure should the relief valve be set?
• How are wire connections regulated in marine applications?
• Are gear pumps self-priming?
• What function does a holding tank vent line serve?
• How many portable (USCG Type B-1) fire extinguishers must be present on a boat that is between 26 and 40 feet in length?
• What special provision must be included for a sewage y-valve when the discharge seacock is not lockable?
• What is the maximum allowable distance between supports for hydraulic lines?
• Which plastic material is advisable for sewage holding tanks?
• What safety factor should be used for determining necessary restraining forces for the installation of a holding tank?
• Which of the following materials is FDA approved for contact use in potable systems?
• Which of the following is an acceptable material for contact use in potable water systems?
• Which type of anti-freeze is toxic and not allowed for cooling potable water?
• Tech A states that fuel tank sending units must have a dedicated negative ground wire. Tech B claims there are exceptions. Who is correct?
• Which device is specifically designed to allow waste to be unloaded from a holding tank?
• What must be ensured for an electric steering system upon powering up?
• When selecting a fuse for a bilge blower installation, what is the most important factor to consider?
• What might happen if a diaphragm pump is allowed to run dry?
• According to ABYC, must all battery chargers indicate output current status?
• Which type of capacitor contributes to improved energy efficiency in motors?
• Which gas is classified as LPG?
• What type of pump is typically used for flushing a toilet?
• What is the maximum unsupported length of cable allowed for connection to batteries?
• Which component is essential if a fuel tank outlet is above the fuel distribution line level?
• At what pressure should the LPG fuel supply line and fittings be tested?
• Which type of pump typically requires less maintenance?
• What is the main factor determining the allowed voltage drop for most applications?
• What is the maximum pressure that a desalinator can impart to a storage tank?
• An air conditioning condensate drain on a gasoline powered vessel should be located:
• Exhaust blowers on diesel boats are primarily used to:
• What type of short-circuit protection is required for battery banks with over 2200 CCA or 500 AH ratings?
• True or False: It is allowable for a fuel tank to be in contact with bilge water as long as it is constructed of a corrosion-resistant material.
• Why must careful consideration be given to the location and routing of inlet and discharge lines for manual flush toilets?
• What happens if the air filter in a compressor pump is not maintained?
• What is the relative size difference between AC supply and return ducts?
• What type of fire occurs with flammable liquids, oils, grease, and gasses?
• What is the minimum gauge required for connecting battery charger and inverter cases back to the engine negative terminal or bus?
• What precaution must be taken when installing a brass fitting into an aluminum fuel tank?
• Electric steering must complete its full range of travel within which time period against 500 ft. lbs opposing torque?
• Which component is most likely to not be ignition protected?
• What temperature range can pumps tolerate exposure to without damage?
• Are diaphragm pumps self-priming?
• What is the minimum inside diameter required for fuel fill hose?
• True or False: Inverters with integral AC outlets must contain an embedded GFCI.
• When calculating holding tank size, how many flushes per day are included in the calculation?
• What is a critical measure to take to avoid pumping efficiency loss?
• A seacock may be installed instead of a siphon break to prevent discharge and back siphoning. True or False?
• A technician routing a fuel hose within an engine room should use which type of hose?
• What is the only allowable use case for a check valve in a bilge pump system?
• What is the maximum allowable pressure for a storage tank and vent system?
• For tubing measurement, which dimension is primarily used?
• What type of LPG system line pressure is limited to a maximum of 3.5 kPa?
• What is the minimum distance for installing hose clamps from the end of a fuel hose?
• Is CNG considered lighter than air?
• What is defined as "minimum retained (hydraulic) system performance"?
• Which of the following components must be vented in a sewage system?
• True or False: If a portable toilet is secured and fitted with a deck pump-out fitting and vent it qualifies as a type III device.
• When is an ELCI or RCD required to be installed?
• What is the function of a flapper valve in a diaphragm pump?
• Diesel tank inspection openings must be of what minimum size and located where?
• Which type of fittings can fail due to vibration fatigue when used with metal LPG tubing?
• According to ABYC A-24, how should a CO monitor be installed?
• Hydraulic system components shall not be installed in areas where the operating temperature exceeds what degree Fahrenheit?
• For how long must a bilge pump be capable of continual operation at design voltage and maximal amperage?
• What is another name for a vented loop that prevents back siphoning by breaking suction yet allowing normal flow when pressurized?
• If a battery charger is installed more than 7 inches away from the battery bank, what is required?
• To reduce the possibility of rupture due to freezing, all A/C overboard discharge lines above the water line shall be self-draining within what distance of the hull?
• What safety measure should be taken when storing LPG cylinders?
• Is it true or false that boats under 26 feet may be equipped with a bucket on a lanyard instead of a Class A fire extinguisher?
• How many hose clamps are recommended for use on all fuel fill lines?
• Is it true or false that a holding tank vent line must have a constant rise from the tank to the vent fitting?
• What is the minimum inside diameter for a fuel fill system?
• When inspecting fuel hoses, which of the following is not a requirement?
• What characteristic makes flexible impeller pumps particularly suited for marine applications?
• True or False: It is permissible to use the grounded conductor from a fuel tank sender unit as the grounding conductor for the tank.
• What is the load test requirement for seacock assemblies?
• What is the minimal distance required between a holding tank vent fitting and any opening into an accommodation space?
• What is the minimal allowed separation between fuel tank ventilation and fuel fill openings and compartment ventilation openings?
• By what percentage does a start capacitor typically increase motor torque?
• What is an acceptable height for dropping fully filled portable fuel tanks without leaks occurring?
• What should be monitored to ensure compliance with federal holding tank regulations?
• Which of the following is true regarding the fuel fill cap?
• Can Bilge Blower motors tolerate a 10% voltage drop when sizing DC cables?
• Which material is NOT allowable for contact use in potable water systems?
• True or False: Most GFCI's are inherently ignition protected.
• If a vessel has both upper and lower helm stations, how should the hydraulic systems be configured?
• What must be done to prevent the ingress of sea water into a potable water tank?
• What is the maximum amount of fuel that may leak before additional tests are required?
• In its natural form, is LPG non-toxic and has no smell?
• True or False: Pre-wired battery chargers with isolated outputs require overcurrent protection on both positive and negative outputs.
• What might happen to OC protection on a compressor pump if the air filter is excessively dirty?
• What are the reference evaporation and condensing temperatures for AIR cooled air conditioning compressors?
• What is the smallest wire gauge allowed by ABYC if not sheathed or inside equipment housing?
• What colors should portable gasoline and diesel fuel tanks be respectively?
• What should be used to ensure a secure connection for raw water intake hoses?
• What percentage of steering arm full travel must be retained in minimum retained hydraulic performance?
• If power is drawn from the output of a battery switch, is independent overcurrent protection required according to ABYC?
• Which ABYC standard specifies minimum clean agent fire extinguisher sizes for various engine compartment sizes?
• What connection method is preferred for flexible hose to fittings in sewage systems?
• Which of the following statements about fuel tank vents is correct?
• What is the biggest advantage of a diaphragm pump over an impeller pump?
• Which component is prohibited to be fitted with liquefied gas entry in LPG systems?
• The device used to prevent raw water from siphoning into the boat is known as:
• When considering the distance between supports for hydraulic lines, what is the maximum distance acceptable?
• What role does the accumulator tank play in a water system?
• For A/C return air ducts, should the cabin intake be mounted high or low?
• Which of the following is NOT one of the main categories of pump types?
• Which of the following is NOT a component of LPG?
• What are three names typically ascribed to the check-valve in diaphragm pumps?
• Why is it hazardous to have a fuel tank outlet situated above the height of fuel distribution and return lines?
• What specification is required for flexible air ducts in AC systems?
• To prevent backfilling with sewage, where should a toilet diaphragm pump be located in relation to the holding tank?
• True or False: Flexible fuel fill hose may be USCG A1, A1-15, A2, B1, B1-15, or B2 standards.
• Which type of thread do ball valve assemblies (seacock assemblies) typically use?
• What is the maximum allowable output pressure from an LPG pressure regulator?
• What is a common consequence of improper routing of sewage inlet and discharge lines?
• What is the maximum pressure rating for all components of LPG systems?
• Can air conditioning systems that service engine rooms also serve accommodation spaces?
• When troubleshooting a fuel supply problem, which tool should be used to measure fuel pump inlet restriction?
• Which of the following is the most suitable method for a water hose attachment?
• Raw water intakes are best fitted with which type of hose?
• Which component's temperature limitation is 170 °F?
• What is the minimum allowable pressure for a fuel tank vent system?
• Which of the following is NOT a type of pump typically used in marine sanitation systems?
• In HVAC systems, what does the acronym HACR specifically refer to?
• How far from the engine exhaust system output must evaporator condensate drains terminate?
• What is one requirement for materials used in portable fuel tanks?
• True or False: If space prevents direct connection of thru-hull fittings to the hull, a single non-flexible component may be installed.
• Are LPG and propane considered the same substance?
• If a CO detector alarm can be muted, how long will the mute last?
• Which property is essential for fuel tank materials to ensure durability in marine environments?
• Are piston pumps self-priming?
• Which material is most susceptible to "crevice" corrosion?
• Which factor could lead to a malfunction in a diaphragm pump for toilets?
• What should be used to secure rigid PVC to minimize vibration effects in sewage systems?
• What component is needed for a battery charger to effectively ground its chassis?
• True or False: Storage tank inlet caps must be retained to prevent loss.
• What type of pump is typically used for oil pumping?
• Which of the following mechanical factors affects pump efficiency?
• What type of material is banned for the construction of gasoline fuel tanks in marine applications?
• Which of the following is NOT a requirement for marine fuel tank installations according to ABYC?
• In the context of sewage treatment systems, what does a type III device refer to?
• True or False: Condensate drain lines shall have a trap installed.
• How many BTUs per hour are equivalent to 1 Watt?
• What is the minimal allowable distance above a flat horizontal surface for a fuel tank to be mounted?
• Which of the following is NOT a potential cause of fire in a marine sanitation system?
• What issue is polyester resin known for in terms of fiberglass usage?
• True or False: Helm displacement refers to the amount of hydraulic fluid output per helm revolution.
• Do electrical resistance heating elements installed in air handling systems require over-temperature protection devices?
• What is needed in fuel systems to prevent siphoning action?
• True or False: Metal LPG tubing shall be connected with "long nut" type flare fittings.
• Which type of pump can typically produce the highest pressures?
• What is the potential danger of a liquid drain without an installed trap that exits above the waterline?
• Is LPG lighter than air and does it rise when released?
• According to technician comments, which statement is correct regarding Carbon Monoxide monitors?
• The primary function of a vented loop in a plumbing system is to:
• True or False: Potable water systems must be equipped with a drain.
• What are the two common names for the check-valve used in a diaphragm pump?
• What type of pump is typically used for bilge pumps?
• What indicates that a battery charger is properly wired to prevent overcurrent issues?
• When bleeding a hydraulic system, what factors should a technician consider?
• What is the designed operating temperature range for carbon monoxide detectors?
• True or False: Harmonic distortion of AC output waveform from some inverters may interfere with proper GFCI operation.
• Are AC wire sizes determined by ampacity or voltage drop according to ABYC?
• What is a common use for a smoke bomb in marine applications?
• Do all marine power inverters need to employ an isolation transformer?
• What is the purpose of the conductor connecting battery charger and inverter cases back to the engine negative terminal?
• Which method is not an acceptable way to separate a fresh water flushing system from a potable water system?
• What condition is indicated by a visible pink color on an underwater bronze alloy fitting?
• What is the name given to the complete system including toilets, hoses, pipes, holding tanks and fittings designed to receive, retain, vent and pump out sewage?
• True or False: The storage tank vent may be used for filling purposes.
• Is it true or false that a CO detector must be installed on all boats with an enclosed accommodation space?
• "Hammering" or pulsation in a potable water system can be prevented by adding which component?
• Which of the following is a characteristic of gel cell batteries compared to flooded cell batteries?
• What does a diaphragm pump primarily rely on to control fluid flow?
• Which types of pumps can typically pass small solids?
• What is the maximum allowed temperature that a heat source may produce in a compartment containing LPG appliances?
• What is a key performance indicator for hydraulic system operations regarding pressure usage?
• What is the purpose of overcurrent protection in marine electrical systems?
• A high-pressure shut-down safety mechanism is required for refrigerant systems with more than how much refrigerant weight?
• True or False: The end fittings for flexible LPG hose must be permanently attached.
• What is the purpose of a bonding conductor in relation to a fuel tank?
• What should be considered when setting the relief valve for a water system?
• What does HACR stand for in relation to electrical systems?
• What is a consequence of using an incorrect type of sanitation hose?
• Why is calcium buildup dangerous for a siphon break?
• According to ABYC, which of the following considerations is NOT required for evaporator condensate drains?
• What should be checked when inspecting fuel hoses for safety?
• Excessive heat in an engine room can lead to:
• What provision should be made when using rigid PVC for sewage systems?
• What is the maximum allowable pressure in a fuel tank vent system?
• In which of the following applications is a gear pump most likely utilized?
• How often should sewage be treated in a no-discharge zone if a treatment system is present?
• True or False: Each desalinator must be equipped with an automatic shutoff salinity detector.
• True or False: Impeller pumps are typically self-priming.
• True or False: Impeller pumps may be damaged by running dry.
• What thickness is recommended for holding tanks made of linear or cross-linked polyethylene?
• What must each LPG appliance contain in regard to supply lines from the cylinder locker?
• How long must there be no measurable drop in pressure when testing an installed LPG system?
• Is a pressure gauge a mandatory component for every LPG system?
• Are systems using LPG cylinders designed to admit liquefied gas into other parts of the system allowed?
• What volume of human waste is used per flush when calculating holding tank size?
• What device is used to separate potable water from other water systems?
• Is it true or false that diesel machinery in protected spaces on gasoline boats must automatically shut down upon discharge of a fixed fire extinguishing system?
• Which of the following is necessary to prevent collapse in raw water intake hosing?
• Which class of devices is excluded from overcurrent protection?
• True or False: Flexible fuel vent hose inside an engine room should meet USCG Type A1, A1-15, or A2 standards.
• What is the primary purpose of installing a pressure gauge in an LPG system?
• Which condition can lead to decreased efficiency in an HVAC system?
• What percentage increase in motor torque is generally provided by a start capacitor?
• In which three areas on a boat must electrical devices be "ignition protected"?
• What preventive measure is essential for winterizing a water heater?
• What is the minimum inside diameter of vent openings in the fuel tank?
• What does pink discoloration on a bronze fitting indicate?
• True or False: A shut-off valve is required in gravity feed fuel systems.
• What type of device is required at the LPG manifold in systems with multiple cylinders?
• How does harmonic distortion affect inverters?
• If a diesel fuel filter with a plastic sight bowl is installed in an engine space, what additional feature is desirable?
• What type of shut-off valve is recommended for safety at engine fuel inlet over long distances?
• On a mechanical cable over sheave steering system, which factor is NOT taken into account for cable clamp attachment?
• Can centrifugal pumps be damaged by running dry?
• If a gasoline tank is made of stainless steel, what is the maximum allowable capacity according to ABYC requirements?
• Is it permissible to have more than one wire per terminal connector?
• What type of overcurrent protection is needed for wires leading from an ammeter shunt in a positive DC conductor?
• What is the "7-40-72" rule for DC overcurrent protection?
• What electrical connection should be made to a battery charger case/chassis?
• True or False: Storage tanks must be equipped with a vent.
• What is the minimum schedule for plastic and metal fuel fill pipe?
• What rate of static pressure must a storage tank withstand?
• What term describes the corrosion that occurs on stainless fixtures underwater due to lack of oxygen?
• What should portable gas containers be capable of withstanding with regard to lifting handles?
• What happens to bronze alloy fittings exposed to stray currents?
• For maximum safety, fuel lines should be made of which material?
• Which organization must approve composite materials used for the construction of portable water tanks?
• What is the equation for approximating flooding rate for a below-waterline hole?
• What main function does a seacock valve serve in a bilge pump system?
• What is the minimum distance between support clamps for refrigerant piping?
• Why is it advisable to use plastic fittings with plastic holding tanks?
• Is it acceptable for a battery charger to have exposed wiring?
• Where must the pressure gauge be installed in LPG systems?
• True or False: ABYC and USCG do not require double hose clamps on thru-hull fittings, but ISO "CE" standards do.
• A portable fuel tank must have a base/height ratio that won't upset if tilted to how many degrees?
• What is the maximum distance allowed between the main shore power disconnect circuit breaker and the shore power inlet before additional protection is needed?
• When installing a windlass, which of the following should NOT be considered?
• How quickly must electric steering systems be operational after powering up?
• What is the minimum diameter required for a removable holding tank's vent line?
• What type of pump is typically used for toilet flushing?
• At what pressure should the low-side relief valve of an LPG system discharge?
• When should the output neutral of an inverter/charger be grounded?
• If a fuse is used for additional overcurrent protection near the shore power inlet, what must be true about its AIC?
• How many appliances are allowed to be supplied from a single LPG line according to the regulations?
• Why is a macerator pump not classified as Type I, II, or III MSD?
• What feature must be incorporated into all raw water intake hosing?
• What must be installed if the fuel distribution line length from tank outlet to engine inlet exceeds 12 ft?
• Which of the following is a feature of barbed hose adapters?
• What are two special features required for an AC power transfer switch?
• Which of the following is a true statement about the sewage treatment process?
• What is the primary function of a motor "run" capacitor?
• What two items are necessary for a pump to discharge below the waterline?
• Why is the motor "locked rotor" condition problematic for overcurrent protection?
• Which technician statement regarding evaporator issues is correct?
• For A/C ducts, how high should cool air output "supply" ducts be mounted in the cabin?
• What type of flexible fuel fill hose is permitted inside engine compartments?
• What is the minimum diameter for the dedicated vent at the bottom of an LPG locker?
• Should AC discharge (supply) vents be grilled with metal or wood?
• True or False: Hull penetrations without a seacock must use reinforced pipe or hose that resists kinking and collapse.
• What is the primary function of a check valve in a diaphragm pump?
• What marking must be on pipes or tubes that are not capable of handling hot water?
• How long should a static load test last for portable gas hose connections?
• What is the most commonly used material for potable water systems?
• A Type 1 sanitation system is designed to permit which of the following?
• What are the allowable distances for AC power source overcurrent protection?
• What is an essential requirement for portable water tanks constructed using composite materials?
• Sink drains that exit below the water line are required by ABYC to have what?
• What type of antifreeze is recommended for use in potable water and sanitation systems for winterization?
• What three factors must be known when sizing AC wiring?
• True or False: An LPG locker is required for the storage of an unconnected (reserve) LPG cylinder.
• What is the minimum distance that compartment ventilation and fuel fill/fuel vent openings should be located from each other?
• What is the minimum weight a friction-type electrical connection must withstand on the first pull?
• What is the recommended action if a holding tank is getting full?
• In hydraulic systems, how is proof pressure defined in relation to working pressure?
• The purpose of a battery switch on a boat is to:
• Which winding typically has a higher resistance, motor start winding or run winding?
• What are the trip level and trip time maximums for ELCIs and RCDs?
• What is the operational ambient temperature range for LPG systems?
• What is the required ratio of area to volume for a compartment to be considered "open to atmosphere"?
• If rigid metallic fuel lines are secured to the hull, how must they connect to the engine?
• How far above the bilge water level must a battery charger be installed?
• When and why must siphon breaks be installed in a sewage system?
• According to USCG recommendations, what should all seacocks be fitted with?
• What is the minimum accepted air flow (in cabin feet per minute) over the indoor coil on a heat pump (per ton)?
• What is the minimum hose inner diameter recommended for use on un-macerated sewage?
• What is the maximum allowable pressure for a pressure reducing valve and check valve installed after a shore water connection?
• Copper Tubing is measured primarily by which method?
• What is the static load test limit for portable gas hose connections?
• Where must LPG locker vents be led outboard?
• What is the maximum allowable surface temperature of a pump at an ambient temperature of 140 F?
• Must all inverters have a remote "on-line/standby" indicator located at the main AC distribution panel?
• Which statement is true regarding the production of smell in sewage systems?
• What is the allowable range in microns for a fuel strainer installed at the end of a pickup line inside a gasoline fuel tank?
• What type of fuel distribution line is allowable inside an engine compartment?
• What can excessive calcium buildup in marine sanitation systems lead to?
• True or False: Valves and peacocks for drawing gasoline from a fuel tank are allowed.
• Fuel tanks shall be restrained to prevent movement of more than how many inches?
• Are all macerator pumps self-priming?
• What type of fitting shall be used for a deck pump-out to ensure liquid and vapor tightness?
• If a sight gauge is used on a diesel fuel tank, what must accompany the gauge?
• Which hose characteristic can compromise pump efficiency?
• An electric water heater rated at 1500 Watts on a 120 VAC circuit requires a minimum fuse size of:
• What is the consequence of carrying fuel hoses under bilge water?
• What type of hose should a technician use for a fuel feed line in an engine room?
• What ingredient should never be used to clean brass LPG fittings?