ABYC Systems- American Boat and Yacht
Council EXAM LATEST 2026-2027
QUESTIONS AND 100% Verified ANSWERS
1. According to ABYC H-23, what is the minimum required height
above the waterline for a raw water intake through-hull fitting
located in the side of the hull?
A) 4 inches
B) 6 inches
C) 10 inches
D) 12 inches
Answer: D) 12 inches
Explanation: ABYC H-23 requires raw water intake openings in the hull side to be at least
12 inches (305 mm) above the waterline at maximum load, unless the fitting is equipped
with a proper seacock and anti-siphon protection.
2. Which type of hose is required for a flexible section in a
gasoline fuel fill line per ABYC H-24?
A) USCG Type A1 or A2
B) USCG Type B1 or B2
C) Any fuel-resistant hose with wire reinforcement
D) Non-metallic hose meeting SAE J1527
Answer: A) USCG Type A1 or A2
Explanation: ABYC H-24 requires fuel fill hoses to be USCG Type A1 for below-deck or
A2 for above-deck applications, as they provide fire resistance and fuel vapor
permeability limits.
,3. What is the maximum allowable voltage drop for a bilge pump
circuit that is critical for safety, per ABYC E-11 (applied to
systems)?
A) 3%
B) 5%
C) 10%
D) 15%
Answer: A) 3%
Explanation: ABYC E-11 (incorporated into systems knowledge) requires a maximum 3%
voltage drop for critical safety circuits such as bilge pumps, navigation lights, and
electronic engine controls.
4. According to ABYC H-2 (Ventilation of Boats Using Gasoline), a
natural ventilation system must have at least how many exhaust
ducts?
A) 1
B) 2
C) 3
D) 4
Answer: B) 2
Explanation: ABYC H-2 requires at least two exhaust ducts (one on each side of the
vessel) for natural ventilation, in addition to intake ducts, to properly evacuate fuel
vapors from the bilge.
,5. For a marine sanitation device (MSD) Type I, what is the
maximum allowable fecal coliform count per 100 milliliters of
treated discharge?
A) 1,000
B) 1,000,000
C) 200
D) 0
Answer: A) 1,000
Explanation: ABYC H-33 references USCG standards: Type I MSDs may discharge treated
waste with fecal coliform not exceeding 1,000 per 100 mL, with no visible solids.
6. What is the minimum required diameter for a portable fire
extinguisher discharge outlet in a machinery space per ABYC A-1?
A) ½ inch
B) ⅝ inch
C) ¾ inch
D) 1 inch
Answer: C) ¾ inch
Explanation: ABYC A-1 specifies that fixed fire extinguishing system nozzles must have a
minimum orifice diameter of ¾ inch (19 mm) for proper agent distribution in engine
compartments.
7. According to ABYC P-1 (Propulsion Systems), a propeller shaft
that passes through a stuffing box must have what minimum
clearance from the hull cutless bearing?
A) 0.010 inches
B) 0.020 inches
, C) 0.062 inches
D) 0.125 inches
Answer: C) 0.062 inches
Explanation: ABYC P-1 requires a minimum clearance of 1/16 inch (0.0625 in) between
the shaft and the cutless bearing to allow proper water lubrication and prevent binding.
8. What is the required burst pressure rating for a raw water
cooling hose (wet exhaust) installed below the waterline per ABYC
P-1?
A) Equal to maximum engine coolant pressure
B) 2 × maximum expected operating pressure
C) 4 × maximum expected head pressure or 30 psi, whichever is greater
D) 10 × maximum expected pressure
Answer: C) 4 × maximum expected head pressure or 30 psi, whichever is greater
Explanation: ABYC P-1 requires raw water hoses below waterline to have a burst
pressure of at least 4 times the maximum head pressure (or 30 psi min) to prevent
catastrophic failure.
9. Per ABYC H-23 (Potable Water Systems), what material is
prohibited for use in drinking water systems?
A) Copper
B) Stainless steel 316L
C) Lead-containing solder or brass with >0.25% lead
D) Reinforced PVC
Answer: C) Lead-containing solder or brass with >0.25% lead
Explanation: ABYC H-23 prohibits materials containing lead that can leach into potable
water; therefore solder and brass with high lead content are not allowed.
Council EXAM LATEST 2026-2027
QUESTIONS AND 100% Verified ANSWERS
1. According to ABYC H-23, what is the minimum required height
above the waterline for a raw water intake through-hull fitting
located in the side of the hull?
A) 4 inches
B) 6 inches
C) 10 inches
D) 12 inches
Answer: D) 12 inches
Explanation: ABYC H-23 requires raw water intake openings in the hull side to be at least
12 inches (305 mm) above the waterline at maximum load, unless the fitting is equipped
with a proper seacock and anti-siphon protection.
2. Which type of hose is required for a flexible section in a
gasoline fuel fill line per ABYC H-24?
A) USCG Type A1 or A2
B) USCG Type B1 or B2
C) Any fuel-resistant hose with wire reinforcement
D) Non-metallic hose meeting SAE J1527
Answer: A) USCG Type A1 or A2
Explanation: ABYC H-24 requires fuel fill hoses to be USCG Type A1 for below-deck or
A2 for above-deck applications, as they provide fire resistance and fuel vapor
permeability limits.
,3. What is the maximum allowable voltage drop for a bilge pump
circuit that is critical for safety, per ABYC E-11 (applied to
systems)?
A) 3%
B) 5%
C) 10%
D) 15%
Answer: A) 3%
Explanation: ABYC E-11 (incorporated into systems knowledge) requires a maximum 3%
voltage drop for critical safety circuits such as bilge pumps, navigation lights, and
electronic engine controls.
4. According to ABYC H-2 (Ventilation of Boats Using Gasoline), a
natural ventilation system must have at least how many exhaust
ducts?
A) 1
B) 2
C) 3
D) 4
Answer: B) 2
Explanation: ABYC H-2 requires at least two exhaust ducts (one on each side of the
vessel) for natural ventilation, in addition to intake ducts, to properly evacuate fuel
vapors from the bilge.
,5. For a marine sanitation device (MSD) Type I, what is the
maximum allowable fecal coliform count per 100 milliliters of
treated discharge?
A) 1,000
B) 1,000,000
C) 200
D) 0
Answer: A) 1,000
Explanation: ABYC H-33 references USCG standards: Type I MSDs may discharge treated
waste with fecal coliform not exceeding 1,000 per 100 mL, with no visible solids.
6. What is the minimum required diameter for a portable fire
extinguisher discharge outlet in a machinery space per ABYC A-1?
A) ½ inch
B) ⅝ inch
C) ¾ inch
D) 1 inch
Answer: C) ¾ inch
Explanation: ABYC A-1 specifies that fixed fire extinguishing system nozzles must have a
minimum orifice diameter of ¾ inch (19 mm) for proper agent distribution in engine
compartments.
7. According to ABYC P-1 (Propulsion Systems), a propeller shaft
that passes through a stuffing box must have what minimum
clearance from the hull cutless bearing?
A) 0.010 inches
B) 0.020 inches
, C) 0.062 inches
D) 0.125 inches
Answer: C) 0.062 inches
Explanation: ABYC P-1 requires a minimum clearance of 1/16 inch (0.0625 in) between
the shaft and the cutless bearing to allow proper water lubrication and prevent binding.
8. What is the required burst pressure rating for a raw water
cooling hose (wet exhaust) installed below the waterline per ABYC
P-1?
A) Equal to maximum engine coolant pressure
B) 2 × maximum expected operating pressure
C) 4 × maximum expected head pressure or 30 psi, whichever is greater
D) 10 × maximum expected pressure
Answer: C) 4 × maximum expected head pressure or 30 psi, whichever is greater
Explanation: ABYC P-1 requires raw water hoses below waterline to have a burst
pressure of at least 4 times the maximum head pressure (or 30 psi min) to prevent
catastrophic failure.
9. Per ABYC H-23 (Potable Water Systems), what material is
prohibited for use in drinking water systems?
A) Copper
B) Stainless steel 316L
C) Lead-containing solder or brass with >0.25% lead
D) Reinforced PVC
Answer: C) Lead-containing solder or brass with >0.25% lead
Explanation: ABYC H-23 prohibits materials containing lead that can leach into potable
water; therefore solder and brass with high lead content are not allowed.
