ABYC AIR CONDITIONING AND
REFRIGERATION CERTIFICATION PRACTICE
SCRIPT 2026 TESTED QUESTIONS WITH
ANSWERS
◉ True. Answer: 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.
◉ Prevention of siphoning. Answer: Why must careful consideration
be given to the location and routing of inlet and discharge lines for
manual flush toilets when the "shut-off" merely bleeds air into the
inlet line?
◉ Whenever components are installed below the max heeled water
line - to prevent back flow into the vessel or unintentional siphoning
of untreated effluent overboard.. Answer: When and why must
siphon breaks be installed in a sewage system?
◉ True. Answer: A seacock may be installed instead of a siphon
break to prevent discharge and back siphoning. T or F?
,◉ The handle must be lockable in the direction of the holding tank.
Answer: What special provision must be included for a sewage y-
valve when the discharge seacock is not lockable?
◉ Air Gap, Vacuum Break, Double Check Valve, Dedicated Water
Tank. Answer: Name four ways to separate a fresh water flushing
system from potable water system.
◉ 1.5 inches. Answer: What is the minimum hose ID for use on un-
macerated sewage?
◉ Secure mounting to minimize vibration effect, use flexible hose to
connect to fitting and hull.. Answer: What provisions should be
made if using rigid PVC for sewage?
◉ linear or cross-linked polyethylene, 1/4 inch thick or greater..
Answer: What plastic material is recommended for sewage holding
tanks?
◉ Epoxy and Vinyl Esther are ok, but polyester resin is not because
of susceptibility to osmotic blistering.. Answer: Of the three major
type of Fiberglass Reinforced Plastic (FRP), which one is not
recommended and why?
,◉ 5/8 inch. Answer: A removable holding tank's vent line shall be
what minimum diameter?
◉ 8 lbs. Answer: What is the approximate weight of a gallon of
sewage?
◉ 2X weight of tank and contents when full. Answer: What safety
factor shall be utilized when determining necessary restraining
forces for installation of a holding tank?
◉ neoprene, bonded to tank surface with non-hydroscopic adhesive..
Answer: What material is recommended to be used to prevent chafe
between metallic tanks and tank supports, bracing, etc?
◉ Similar coefficient of thermal expansion - helps prevent leaks..
Answer: Why is it recommended to use plastic fittings with plastic
holding tanks?
◉ 1.5 inch, internal national pipe thread (NPT) - liquid and vapor
tight.. Answer: What type of fitting shall be used for deck pump-out?
◉ True. Answer: True or False: holding tank vent line shall have a
constant rise from the top of the tank to the vent fitting and be as
short as possible.
, ◉ True. Answer: Only anaerobic bacterial produce a smell. T or F?
◉ 24 inches. Answer: What is the minimal distance allowed between
a holding tank vent fitting and any opening into an accommodation
space?
◉ True. Maceration does not reduce bacteria content.. Answer: A
macerator pump is not a Type I, II, or III MSD.
◉ False.. Answer: T or F: All macerator pumps are self-priming
◉ Diaphragm Pump. Answer: What type of pump is used for flushing
a toilet?
◉ True. Answer: Diaphragm pumps are self-priming, T or F?
◉ False. Should be above top of tank to prevent back filling with
sewage when tank is full.. Answer: To facilitate flushing, the toilet
diaphragm pump should be located below the level of the top of the
holding tank.
◉ True. Answer: Federal regulations require that all holding tanks
have a means for indicating when the tank is 3/4 full by volume. T or
F?
REFRIGERATION CERTIFICATION PRACTICE
SCRIPT 2026 TESTED QUESTIONS WITH
ANSWERS
◉ True. Answer: 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.
◉ Prevention of siphoning. Answer: Why must careful consideration
be given to the location and routing of inlet and discharge lines for
manual flush toilets when the "shut-off" merely bleeds air into the
inlet line?
◉ Whenever components are installed below the max heeled water
line - to prevent back flow into the vessel or unintentional siphoning
of untreated effluent overboard.. Answer: When and why must
siphon breaks be installed in a sewage system?
◉ True. Answer: A seacock may be installed instead of a siphon
break to prevent discharge and back siphoning. T or F?
,◉ The handle must be lockable in the direction of the holding tank.
Answer: What special provision must be included for a sewage y-
valve when the discharge seacock is not lockable?
◉ Air Gap, Vacuum Break, Double Check Valve, Dedicated Water
Tank. Answer: Name four ways to separate a fresh water flushing
system from potable water system.
◉ 1.5 inches. Answer: What is the minimum hose ID for use on un-
macerated sewage?
◉ Secure mounting to minimize vibration effect, use flexible hose to
connect to fitting and hull.. Answer: What provisions should be
made if using rigid PVC for sewage?
◉ linear or cross-linked polyethylene, 1/4 inch thick or greater..
Answer: What plastic material is recommended for sewage holding
tanks?
◉ Epoxy and Vinyl Esther are ok, but polyester resin is not because
of susceptibility to osmotic blistering.. Answer: Of the three major
type of Fiberglass Reinforced Plastic (FRP), which one is not
recommended and why?
,◉ 5/8 inch. Answer: A removable holding tank's vent line shall be
what minimum diameter?
◉ 8 lbs. Answer: What is the approximate weight of a gallon of
sewage?
◉ 2X weight of tank and contents when full. Answer: What safety
factor shall be utilized when determining necessary restraining
forces for installation of a holding tank?
◉ neoprene, bonded to tank surface with non-hydroscopic adhesive..
Answer: What material is recommended to be used to prevent chafe
between metallic tanks and tank supports, bracing, etc?
◉ Similar coefficient of thermal expansion - helps prevent leaks..
Answer: Why is it recommended to use plastic fittings with plastic
holding tanks?
◉ 1.5 inch, internal national pipe thread (NPT) - liquid and vapor
tight.. Answer: What type of fitting shall be used for deck pump-out?
◉ True. Answer: True or False: holding tank vent line shall have a
constant rise from the top of the tank to the vent fitting and be as
short as possible.
, ◉ True. Answer: Only anaerobic bacterial produce a smell. T or F?
◉ 24 inches. Answer: What is the minimal distance allowed between
a holding tank vent fitting and any opening into an accommodation
space?
◉ True. Maceration does not reduce bacteria content.. Answer: A
macerator pump is not a Type I, II, or III MSD.
◉ False.. Answer: T or F: All macerator pumps are self-priming
◉ Diaphragm Pump. Answer: What type of pump is used for flushing
a toilet?
◉ True. Answer: Diaphragm pumps are self-priming, T or F?
◉ False. Should be above top of tank to prevent back filling with
sewage when tank is full.. Answer: To facilitate flushing, the toilet
diaphragm pump should be located below the level of the top of the
holding tank.
◉ True. Answer: Federal regulations require that all holding tanks
have a means for indicating when the tank is 3/4 full by volume. T or
F?
