1|Page
ABYC Marine Electrical Certification 2025 Exam||
NEWEST EXAM WITH RATIONALES|| GUARANTEED
EXCELLENCE!!!
An electrical diode is a component that:
a. Is found in alternators
b. Is found in galvanic isolators
c. Is found in battery isolators
d. All of the above are correct - ANSWER-d. All of the
above are correct
Voltage drop could be used to test for a bad starter cable.
To test the cable a technician would use the DVOM and
check voltage at what two points?
a. At both ends of the cable
b. The battery terminals
c. The positive cable at starter and engine block (ground)
d. At the starter solenoid and engine block (ground) -
ANSWER-a. At both ends of the cable
An ampere is a measurement of:
a. Power
b. Resistance
c. Potential to do work
,2|Page
d. Current Flow - ANSWER-d. Current Flow
T or F: On an AC and DC combined panel that it affixed
with screws, the energized AC parts on the back of the
panel must be covered. - ANSWER-True.
What is the best way to prevent corrosion on a battery
cable
a. Use WD 40
b. Use corrosion block
c. Heat shrink the entire battery post
d. Use pure copper lugs - ANSWER-b. Use corrosion
block
T or F: A shunt is a conductor of known resistance placed
in series with a circuit to indicate current flow by
measurement of the voltage drop across this conductor. -
ANSWER-True
A light circuit uses a 12 volt battery to power a bulb which
uses 2.5 amps of power. How many watts Is the light
bulb?
a. 10 W
b. 20 W
,3|Page
c. 30 W
d. 40 W - ANSWER-c. 30 W
A branch circuit for DC power can have overcurrent
protection not to exceed _____ of conductor ampacity.
a. 125%
b. 135%
c. 150%
d. Not required - ANSWER-c. 150% (see 11.10.1.5.2)
When combining batteries in DC installation, which
statement is NOT true.
a. two 12 volt batteries connected in series will give 24
volts.
b. two 12 volt batteries connected in parallel will give 12
volts
c. When connected in series, AmpHrs is increased.
d. When connected in series, AmpHrs stays the same. -
ANSWER-c. When connected in series AmpHrs is
increased.
On a vessel with 1 charging source ABYC requires
sustaining DC loads for _____ minutes:
, 4|Page
a. 30
b. 60
c. 90
d. 120 - ANSWER-c. 90 minutes
A customer has a 600 Ah 'house' battery bank and wants
to recharge with the highest amperage (standard flooded
batteries are being used). How high amperage is
reasonable?
a. 200 amps
b. 150 amps
c. 100 amps
d. 50 amps - ANSWER-b. 150 amps (25% of capacity)
While out cruising (away from the dock), batteries on a
typical cruiser have what percentage of charge?
a. 0 - 100%
b. 25 - 75%
c. 50 - 100%
d. 50 - 85% - ANSWER-d. 50 - 85%
ABYC Marine Electrical Certification 2025 Exam||
NEWEST EXAM WITH RATIONALES|| GUARANTEED
EXCELLENCE!!!
An electrical diode is a component that:
a. Is found in alternators
b. Is found in galvanic isolators
c. Is found in battery isolators
d. All of the above are correct - ANSWER-d. All of the
above are correct
Voltage drop could be used to test for a bad starter cable.
To test the cable a technician would use the DVOM and
check voltage at what two points?
a. At both ends of the cable
b. The battery terminals
c. The positive cable at starter and engine block (ground)
d. At the starter solenoid and engine block (ground) -
ANSWER-a. At both ends of the cable
An ampere is a measurement of:
a. Power
b. Resistance
c. Potential to do work
,2|Page
d. Current Flow - ANSWER-d. Current Flow
T or F: On an AC and DC combined panel that it affixed
with screws, the energized AC parts on the back of the
panel must be covered. - ANSWER-True.
What is the best way to prevent corrosion on a battery
cable
a. Use WD 40
b. Use corrosion block
c. Heat shrink the entire battery post
d. Use pure copper lugs - ANSWER-b. Use corrosion
block
T or F: A shunt is a conductor of known resistance placed
in series with a circuit to indicate current flow by
measurement of the voltage drop across this conductor. -
ANSWER-True
A light circuit uses a 12 volt battery to power a bulb which
uses 2.5 amps of power. How many watts Is the light
bulb?
a. 10 W
b. 20 W
,3|Page
c. 30 W
d. 40 W - ANSWER-c. 30 W
A branch circuit for DC power can have overcurrent
protection not to exceed _____ of conductor ampacity.
a. 125%
b. 135%
c. 150%
d. Not required - ANSWER-c. 150% (see 11.10.1.5.2)
When combining batteries in DC installation, which
statement is NOT true.
a. two 12 volt batteries connected in series will give 24
volts.
b. two 12 volt batteries connected in parallel will give 12
volts
c. When connected in series, AmpHrs is increased.
d. When connected in series, AmpHrs stays the same. -
ANSWER-c. When connected in series AmpHrs is
increased.
On a vessel with 1 charging source ABYC requires
sustaining DC loads for _____ minutes:
, 4|Page
a. 30
b. 60
c. 90
d. 120 - ANSWER-c. 90 minutes
A customer has a 600 Ah 'house' battery bank and wants
to recharge with the highest amperage (standard flooded
batteries are being used). How high amperage is
reasonable?
a. 200 amps
b. 150 amps
c. 100 amps
d. 50 amps - ANSWER-b. 150 amps (25% of capacity)
While out cruising (away from the dock), batteries on a
typical cruiser have what percentage of charge?
a. 0 - 100%
b. 25 - 75%
c. 50 - 100%
d. 50 - 85% - ANSWER-d. 50 - 85%
