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ABYC Marine Electrical Certification Exam Review Questions and Answers
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ABYC Marine Electrical Certification Exam Review Questions and Answers
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ABYC Marine Electrical Certification Exam ReviewQuestions and Answers
0 AWG Correct Ans-A technician is installing a cable run from the batteries to the main DC
panel board on a boat as part of a refit. The boat has a 12-volt system and the distance form
the panel to the batteries is 15 ft. The maximum current draw from the panel is calculated at
90 amps. What guage cable should be used (minimum)?
Yellow Correct Ans-DC grounded conductors on new boats that are also equipped with AC
systems should use what color insulated wire?
16 AWG Correct Ans-What is the smallest guage wire allowed for unsheathed wire runs
through the boat?
False. Start batteries have a greater number of thinner plates within each cell. Correct Ans-
T or F: Compared to deep cycle (house) batteries, cranking batteries will have thicker lead
plates to facilitate the higher, short-duration current draws.
Cranking Correct Ans-Which type of battery generally recharges faster? Deep cycle or
cranking?
Wire brush and backing soda. Correct Ans-What tool and common household staple are
used to clean battery terminals?
, ABYC Marine Electrical Certification Exam Review
Questions and Answers
Most of the sulfuric acid has been absorbed into the lead plates, leaving mostly water in the
electrolyte. Correct Ans-Why might a fully-discharged wet-cell type battery freeze?
1 inch, 90 lbs or 2x the battery weight, for 1 minute in each direction. Correct Ans-Batteries
must be secured to prevent movement of more than ______ inches in any direction when a
pulling force of _____ or _____, whichever is less, is applied through the center of gravity of
the battery for how long?
True Correct Ans-T or F: it is ok to install batteries directly below an uninterrupted fuel
line?
Must be protected with dielectric insulating material Correct Ans-What provision must be
in place on any fuel line located within 12 inches of a battery terminals?
80 F, 25 Amps, 10.5 Volts Correct Ans-Define: Battery reserve capacity = the number of
minutes that a new, fully charged battery at ______ degrees F can be continuously discharged
at ______ amps while maintaining _____ volts (for a 12 v battery)
90 minutes Correct Ans-According to ABYC, what is the minimum battery reserve capacity?
32 degrees F, 30 seconds, 7.2V Correct Ans-Define: Marine Cranking Amps = the discharge
load, in amperes, that a new, fully-charged battery at _____ degrees F can deliver for ______
seconds while maintaining a voltage of _____ volts (for a 12 v battery).
, ABYC Marine Electrical Certification Exam Review
Questions and Answers
0 degrees F, 30 seconds, 7.2V Correct Ans-Define: Cold Cranking Amps = the discharge
load, in amperes, that a new, fully-charged battery at _____ degrees F can deliver for ______
seconds while maintaining a voltage of _____ volts (for a 12 v battery).
8 AWG Correct Ans-What is the largest guage wire that may be connected to a bettery with
wing-nuts?
800 CCA or 100 Ahr (exceptions: electronic equipment with battery backed memories; safety
equipment such as bilge pumps, alarms, CO detectors, bilge blowers; battery chargers; I'm
pressed current systems. Correct Ans-Per ABYC E-10, a battery switch must be installed in
the positive conductor from each battery bank with a CCA rating greater than ____ (or greater
than _____ Ah if CCA rating not available).
AIC = 5000 Amps (E-11 table IV-A) Correct Ans-What is the minimum ampere interrupting
capacity (AIC) for main overcurrent protection on a battery bank rated at 12 V, 1500 CCA?
AIC = 2X mnfg's short-circuit rating or 100X nominal Ahr rating. Correct Ans-What is the
minimum ampere interrupting capacity (AIC) for main overcurrent protection on a battery
bank rated at more than 2200 CCA or more than 500 Ahr?
False. "Readily accessible" defines entry into the engine room in an emergency as dangerous -
use a remote battery switch. Correct Ans-T or F: it is ok to mount a battery switch inside an
, ABYC Marine Electrical Certification Exam Review
Questions and Answers
engine room, because ABYC startes that it must be located as close to the batteries as
practical.
Overcurrent protection must be located withing 7 inches of the power source unless
contained within a sheath, in which case it may be up to 40 inches away. If the power source
is a battery and the conductors are sheathed, OC may be up to 72 inches away. Correct
Ans-Explain the "7-40-72" rule
Resetting mechanism cannot overrid over current interrupting mechanism. (Note: some
residential breakers are not trip free) Correct Ans-What does "trip free" breaker mean?
C. 14.1 V Correct Ans-The maximum sustained charging voltage acceptable to some gell
cell battery manufacturers is:
A. 13.8 V
B. 14.5 V
C. 14.1 V
D. 13.2 Vll
0.050 points of specific gravity below other cells = bad cell. Correct Ans-When testing a
wet-cell battery with a hydrometer, what threshold is used to determine a bad cell?
1.260 - 1.285 (temperature dependent) Correct Ans-When testing a wet-cell battery with a
hydrometer, what reading indicates a fully charged battery?
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