ABYC Systems Certification Exam Review Updated Actual Questions and Correct Answers ()

ABYC Systems Certification Exam Review Updated Actual
Questions and Correct Answers (2026-2027)

Question 1.
What is the most often used materials for potable water systems?

Correct Answer: Polyethylene


Question 2.
Name 5 materials allowable for contact use in potable water systems:

Correct Answer: 1. Copper Alloys (incl. bronze, brass and nickel-copper)
2. AISI Type 300 series stainless steel
3. Glass-lined metal
4. FDA approved plastic
5. FDA approved rubber


Question 3.
What device can be used to separate potable water from other water systems?

Correct Answer: Siphon Break


Question 4.
What is the device used to maintain a stable pressure and minimize pump cycling, and
where should it be located?

Correct Answer: Accumulator Tank, after pump/filter and before check-valve


Question 5.
At what what percentage of nominal working pressure shall the relief valve be set?

Correct Answer: 175%


Question 6.
Is a standard household type relief valve acceptable for hot water tanks?

Correct Answer: No, typically these are too high (up to 400% of nominal
pressure)


Question 7.
For the pressure reducing valve and check valve installed after a shore water connection,
what is the maximum allowable pressure?

Correct Answer: nominal working pressure, not to exceed 80 PSI

,Question 8.
Where shall the storage tank be vented?

Correct Answer: overboard


Question 9.
What is the maximum allowable pressure to which the storage tank and vent system be
subjected?

Correct Answer: 3 PSI or mnfg's maximum, which ever is greater.


Question 10.
What temperate range is required for pumps to be able to tolerate exposure?

Correct Answer: -40 °F to +140 °F


Question 11.
When operating at an ambient temperature of 140 F, what is the max allowable surface
temperature of a pump?

Correct Answer: 257 F


Question 12.
Potable water systems must be equipped with a drain. T or F?

Correct Answer: True


Question 13.
Storage tank inlet may also serve as the tank vent. T or F?

Correct Answer: False


Question 14.
Storage tank inlet caps must be retained to prevent loss. T or F?

Correct Answer: True


Question 15.
Storage tanks must be equipped with a vent. T or F?

Correct Answer: True

,Question 16.
Storage tank vent may be used for filling purposes. T or F?

Correct Answer: True


Question 17.
What rate of static pressure must a storage tank withstand?

Correct Answer: At least 1.5X the pressure exerted by the distance from the
tank bottom to the deck fill plate or vent, but not less than 3 PSI.


Question 18.
What is the max pressure that a desalinator can impart to a storage tank?

Correct Answer: 3 PSI


Question 19.
Each desalinator must be equipped with an automatic shutoff salinity detector. T or F?

Correct Answer: True


Question 20.
What marking must be on pipe or tubes that are not capable of handling hot water?

Correct Answer: "For Cold Water Use Only"


Question 21.
What is the test pressure for water heater tank 15 gal or less? over 15 gal but under 120
gal?

Correct Answer: 125 PSI, 300 PSI


Question 22.
What is the max pressure relief valve setting for hot water tanks?

Correct Answer: 175 PSI


Question 23.
What is the max temperature relief setting for hot water tanks?

Correct Answer: 210 F

, Question 24.
What is the max allowable water output temperature for hot water system?

Correct Answer: 125 F


Question 25.
All potable water system connections shall be positioned above the normal bilge water
accumulation level. T or F?

Correct Answer: True


Question 26.
Exposed metallic parts of a potable water system shall have provisions for electrical
bonding. T or F?

Correct Answer: True


Question 27.
For what reason might a holding tank collapse during pump-out?

Correct Answer: Improper venting


Question 28.
What type of MSD (Marine Sanitation Device) discharges effluent with fecal coliform
bacteria count <= 1,000 (per 100 ml) and no suspended solids?

Correct Answer: Type I


Question 29.
What type of MSD (Marine Sanitation Device) discharges effluent with fecal coliform
bacteria count <= 200 (per 100 ml) and <= 150 mg suspended solids per liter?

Correct Answer: Type II


Question 30.
What type of MSD (Marine Sanitation Device) is designed to hold sewage or any waste
derived from sewage?

Correct Answer: Type III