ABYC Marine Electrical Exam Prep Free practice test →

Free ABYC Marine Electrical Practice Questions

10 free, exam-style ABYC Marine Electrical Certification (ABYC Marine Electrical) practice questions with answers and explanations. No signup required. Work through them below, then take the full free ABYC Marine Electrical practice test to study every exam domain.

These 10 free ABYC Marine Electrical questions are organized by exam domain, so you can see how each part of the ABYC Marine Electrical Certification blueprint is tested. Reveal the answer and explanation under each question.

Domain 1: A-24 Carbon Monoxide Detection Systems on Boats (standard)

Question 1

A 12-volt DC bilge pump motor draws 6 amps while running. What is the power consumed by the motor?

  1. 2 watts
  2. 18 watts
  3. 72 watts
  4. 0.5 watts
Show answer & explanation

Correct answer: C - 72 watts

Domain 2: A-27 Alternating Current Generator Sets (standard)

Question 2

A technician is sizing the conductor for a vessel's navigation lights. To remain compliant with ABYC E-11, the maximum allowable voltage drop for this circuit is:

  1. 10%, because lighting circuits are treated as non-critical
  2. 3%, because navigation lights are a critical circuit
  3. 5%, the general default for all DC circuits
  4. There is no voltage-drop limit if the wire meets the ampacity table
Show answer & explanation

Correct answer: B - 3%, because navigation lights are a critical circuit

Question 3

On a boat that also has an AC system, what is the ABYC-recommended color for a DC negative (grounded) conductor?

  1. Black
  2. Yellow
  3. Green
  4. White
Show answer & explanation

Correct answer: B - Yellow

Domain 3: A-28 Galvanic Isolators (standard)

Question 4

An ungrounded conductor runs directly from the positive battery terminal. It is NOT enclosed in a sheath, conduit, or junction box. According to ABYC E-11, what is the maximum distance the overcurrent protection device may be located from the battery?

  1. 7 inches (175 mm)
  2. 40 inches (1.02 m)
  3. 72 inches (1.83 m)
  4. No protection is required on the conductor itself
Show answer & explanation

Correct answer: A - 7 inches (175 mm)

Question 5

During an installation review, a surveyor tests battery restraint by applying a pulling force through the battery's center of gravity. Per ABYC E-10, the battery must not move more than 1 inch when subjected to a force equal to:

  1. Twice the battery weight, applied with no upper force limit
  2. The full weight of the battery in each direction
  3. Twice the battery weight or 90 pounds, whichever is less
  4. 90 pounds in the vertical direction only
Show answer & explanation

Correct answer: C - Twice the battery weight or 90 pounds, whichever is less

Question 6

A galvanic isolator is being installed in the AC shore power grounding (green) conductor. Per ABYC A-28, the isolator and its connections must have a current rating of at least:

  1. 100% of the shore power circuit rating
  2. 125% of the shore power circuit rating
  3. 150% of the shore power circuit rating
  4. 135% of the shore power circuit rating
Show answer & explanation

Correct answer: D - 135% of the shore power circuit rating

Domain 4: A-31 Battery Chargers and Inverters (standard)

Question 7

Two identical 12-volt, 100 amp-hour batteries are connected in series to supply a 24-volt system. What is the resulting voltage and capacity of the bank?

  1. 12 volts and 200 amp-hours
  2. 24 volts and 100 amp-hours
  3. 24 volts and 200 amp-hours
  4. 12 volts and 100 amp-hours
Show answer & explanation

Correct answer: B - 24 volts and 100 amp-hours

Domain 6: E-2 Cathodic Protection Systems (standard)

Question 8

An Equipment Leakage Circuit Interrupter (ELCI) is being installed at the main shore power disconnect. To meet ABYC E-11, the device must trip within which of the following limits?

  1. 30 mA leakage within 100 milliseconds
  2. 5 mA leakage within 100 milliseconds
  3. 30 mA leakage within 1 second
  4. 100 mA leakage within 30 milliseconds
Show answer & explanation

Correct answer: A - 30 mA leakage within 100 milliseconds

Question 9

A 120-volt shore power system does not have an isolation transformer or polarization transformer installed. ABYC E-11 requires which of the following to be present?

  1. A galvanic isolator rated at 135% of the inlet ampacity
  2. An ELCI with a 5 mA trip threshold
  3. A second grounding conductor sized one size larger
  4. A reverse-polarity indicator that signals continuously
Show answer & explanation

Correct answer: D - A reverse-polarity indicator that signals continuously

Domain 8: E-11 AC and DC Electrical Systems on Boats (standard)

Question 10

A boat is powered solely by an inboard diesel engine with no gasoline appliances aboard. Which statement about ignition protection of the electrical components in the engine space is correct per ABYC E-11?

  1. Ignition protection is generally not required for a diesel-only space
  2. Every marine engine space must use ignition-protected components without exception
  3. Ignition protection is required only for AC components, not DC
  4. Ignition protection is required only above the waterline
Show answer & explanation

Correct answer: A - Ignition protection is generally not required for a diesel-only space

The rest of the ABYC Marine Electrical blueprint

The ABYC Marine Electrical exam also covers these domains. Drill them in the full free practice test:

Ready for the real thing?

Practice hundreds more ABYC Marine Electrical questions with instant scoring, weak-area drills, and full exam simulations.

Start the free practice test See pricing