Practice Exam Questions And Correct

ABYC Marine Systems Technician Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

Q1. According to ABYC standards, the minimum ignition protection requirement applies to equipment installed in which area?

• Above deck
• Accommodation spaces
• Gasoline engine compartments
• Lazarette

Answer: C

Rationale: Ignition-protected equipment is required in gasoline machinery

spaces to prevent explosion hazards from fuel vapors.

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Q2. The minimum gauge of grounding conductors for DC systems on boats

is determined primarily by:

• Length of the conductor
• Voltage rating
• Material of conductor
• Expected fault current

Answer: D

Rationale: ABYC bases conductor sizing on how much fault current the

grounding conductor must safely carry.

Q3. ABYC recommends fuel system hoses used in gasoline systems be

rated:

A. SAE J1171

• SAE J1527 Type A1

C. USCG 5/16-A

D. UL 142

Answer: B

Rationale: Type A1 hose is required for gasoline systems due to low

permeation and flame resistance.

Q4. A bonding system on a vessel is primarily intended to: 2 / 4

• Provide DC negative return
• Enhance fuel efficiency
• Minimize galvanic corrosion
• Support AC grounding only

Answer: C

Rationale: Bonding equalizes electrical potential between underwater

metals to reduce galvanic activity.

Q5. According to ABYC E-11, the DC negative must be connected to AC

grounding at:

• Battery positive terminal
• Bilge pump negative
• The grounding bus at one single point
• Engine block only

Answer: C

Rationale: A single-point connection prevents circulating currents and

improves fault-clearing performance.

Q6. The minimum required ventilation rate for an enclosed gasoline tank

compartment is based on:

• Manufacturer preference
• Number of fuel tanks 3 / 4

• Compartment volume
• Hose diameter

Answer: C

Rationale: Ventilation airflow is calculated according to compartment

volume to ensure vapor clearing.

Q7. According to ABYC standards, shore power inlets must be rated for:

• DC only
• 15 amps
• 125 V only
• Marine-grade locking connectors

Answer: D

Rationale: Marine-grade locking inlets prevent accidental disconnection

and water intrusion.

Q8. An isolation transformer on a boat is used to:

• Step up voltage
• Step down current
• Prevent galvanic currents from shore power
• Maintain battery charge

Answer: C

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