ABYC Marine Electrical Certification Exam Study Guide | Marine Electrical Questions, Answers & Exam Prep

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2025 ABYC Marine Electrical
Certification Exam


(T or F) Impedance can be defined as the total resistance flow in a D.C. system -
ANSWER ✔ F (impedance refers to AC systems)


1f an inverter also serves as a battery charger it shall also meet the requirements
of:
a. ABYC A-20 Battery Charging Devices
b. ABYC E-6 Refrigeration Equipment installation
c. A-16 Electric Navigational lighting

d. All of the above - ANSWER ✔ a. ABYC A-20 Battery Charging Devices


A 120V hot water heater is rated at 1750 watts. How much current does it use:
a. 12.5 Amps
b. 12.5 Ohms
c. 14.6 Amps

d. 14.6 Volts - ANSWER ✔ c. 14.6 Amps (not Volts!!)


A 2000 watt inverter is operating at 50% capacity with a 90% effeciency rating.
With a battery voltage of 12.6 volts how many amps is the inverter drawing from
the battery bank?
a. 89 amps
b. 99 amps




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c. 109 amps

d. 119 amps - ANSWER ✔ a. 89 amps


A 2000 watt inverter is operating inverting at 100% effeciency. With 12.6 volts,
how many amps is the inverter drawing from the battery bank?
a. 120 amps
b. 123 amps
c. 137 amps

d. 158 amps - ANSWER ✔ d. 158 amps


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)


A customer complains that her generator will start from the local control panel at
the generator, but not from the remote control panel at the helm. Which of the
foillowing is the most probably cause?
A. Bad generator starter solenoid
B. Low voltage at the starter battery
C. Excessive voltage drop across the remote starter switch

D. Loose battery cable clamp at the starter battery - ANSWER ✔ C. Excessive
voltage drop across the remote starter switch




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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)


A customer is complaining about low-voltage at the AC panel. What should you do
first?
A. Re-calibrate the panel meter
B. Check the voltage at the dock pedestal
C. Check the polarity indicator

D. Replace the overcurrent device - ANSWER ✔ B. Check the voltage at the dock
pedestal


A customer notes a reverse-polarity problem. All of the following are likely causes,
except:
A. Improperly wired shore power cord
B. Improperly wired shore power inlet receptacle
C. An open neutral
D. Reversal of the hot and neutral conductors in the AC panel feeder cable -
ANSWER ✔ C. An open neutral


A deep cycle battery is one with an internal design that suits:
a. low amperage long term discharge




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b. high amperage long term discharge
c. low amperage short term discharge

d. high amperage short term discharge - ANSWER ✔ a. low amperage long term
discharge


A diode is a semiconductor that passes current
a. in any direction
b. only with high voltages
c. only in one direction

d. when used as a triggering device - ANSWER ✔ c. only in one direction


A fully charged 12 volt battery, after a period of rest during which nothing has
been put in or taken out, should have a fully charged voltage of:
a. 12.0 - 12.2 volts
b. 12.2 - 12.4 volts
c. 12.4 - 12.6 volts

d. 12.6 - 12.8 volts - ANSWER ✔ d. 12.6 - 12.8 volts


A fully charged battery, at rest will have a voltage of:
a. 12.2
b. 11.5
c. 12.7

d. 13.2 - ANSWER ✔ c. 12.7




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