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ABYC MARINE ELECTRICAL
CERTIFICATION EXAM 2025
LATEST REAL QUESTIONS AND
CORRECT ANSWERS GRADE A
Strain relief shall be provided for all wiring passing through the battery charger case to relieve strain on terminals, splices or internal wiring. Unless a strain relief method is integral with the case for wiring passing through, a means to achieve strain relief shall be installed within inches of the case. a. 3 " b. 5 " c. 6 " d. 10 " - CORRECT ANSWER✔✔c. 6 " (A-31.6.1) What is a possible problem with installing a new solid state Voltage regulator to replace a manual one? a. Overcurrent protection will have to match new amperage draw from device. b. There could be severe radio interference from the new device.
c. Reverse influx could result, and diodes will have to be installed to modify voltage flow. d. None of the above - CORRECT ANSWER✔✔b. There could be severe radio interference from the new device. (T or F) Impedance can be defined as the total resistance flow in a D.C. system - CORRECT ANSWER✔✔F (impedance refers to AC systems) When installing a starter over current protection must be within inches of the battery. A. 7" B. 40" C. 72" D. None of the above - CORRECT ANSWER✔✔D. None of the above A neutral safety switch is used for: a. Safely switching between forward and reverse without damaging transmission b. Not allowing the engine to start with gear in neutral
b. Excessive amperage c. Insulation temperature rating too low d. Corroded connection - CORRECT ANSWER✔✔c. Insulation temperature rating too low How many conductors may be attached to a single terminal stud? a. 1 b. 2 c. 3 d. 4 - CORRECT ANSWER✔✔d. 4 Each installed battery shall not move more than one inch in any direction when pulling force of ______ lbs or twice battery weight is applied. a. 60 b. 70 c. 80 d. 90 e. 100 - CORRECT ANSWER✔✔d. 90
Multi wire plugs and receptacles used in conjunction with harness type wiring systems shall incorporate means except: a. wire nuts b. molded connectors c. insulation grips d. extended terminal barrels e. all the above - CORRECT ANSWER✔✔a. wire nuts Solenoids are often used as: a. resistors b. capacitors c. remotely activated switches d. voltage regulating devices - CORRECT ANSWER✔✔c. remotely activated switches How often (in inches) shall wire bundles be supported? - CORRECT ANSWER✔✔Every 18 inches.
A. Increased Amperage B. Increased Voltage C. Reduced Ambient Temperature D. Heat - CORRECT ANSWER✔✔D. Heat One HP = how many watts? - CORRECT ANSWER✔✔1 HP = 746 Watts What is the preferred tool for tracing shorted and open circuits? A. Ohm meter B. Amp clamp C. Volt meter D. TDR (time-domain reflectometer) - CORRECT ANSWER✔✔D. TDR (timedomain reflectometer) 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)? - CORRECT ANSWER✔✔0 AWG DC grounded conductors on new boats that are also equipped with AC systems should use what color insulated wire? - CORRECT ANSWER✔✔Yellow What is the smallest guage wire allowed for unsheathed wire runs through the boat? - CORRECT ANSWER✔✔16 AWG T or F: Compared to deep cycle (house) batteries, cranking batteries will have thicker lead plates to facilitate the higher, short-duration current draws. - CORRECT ANSWER✔✔False. Start batteries have a greater number of thinner plates within each cell. Which type of battery generally recharges faster? Deep cycle or cranking? - CORRECT ANSWER✔✔Cranking What tool and common household staple are used to clean battery terminals? - CORRECT ANSWER✔✔Wire brush and backing soda.
ANSWER✔✔80 F, 25 Amps, 10.5 Volts According to ABYC, what is the minimum battery reserve capacity? - CORRECT ANSWER✔✔90 minutes
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). - CORRECT ANSWER✔✔32 degrees F, 30 seconds, 7.2V 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). - CORRECT ANSWER✔✔0 degrees F, 30 seconds, 7.2V What is the largest guage wire that may be connected to a bettery with wing-nuts? - CORRECT ANSWER✔✔8 AWG 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). - CORRECT ANSWER✔✔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.
What does "trip free" breaker mean? - CORRECT ANSWER✔✔Resetting mechanism cannot overrid over current interrupting mechanism. (Note: some residential breakers are not trip free) 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 - CORRECT ANSWER✔✔C. 14.1 V When testing a wet-cell battery with a hydrometer, what threshold is used to determine a bad cell? - CORRECT ANSWER✔✔0.050 points of specific gravity below other cells = bad cell. When testing a wet-cell battery with a hydrometer, what reading indicates a fully charged battery? - CORRECT ANSWER✔✔1.260 - 1.285 (temperature dependent)
When testing a fully charged start battery for capacity with a load tester, what % of CCA rating should be induced by the load to test resulting voltage? - CORRECT ANSWER✔✔50% Most engine-driven alternators are optimally spun at what percentage of engine RPMs? A. Between 10% and 50% B. Less than 10% C. Between 150% and 200% D. Greater than 200% - CORRECT ANSWER✔✔C. Between 150% and 200% T or F: A battery charger case shall be tied to the DC negative output terminal at the battery charger. - CORRECT ANSWER✔✔False. the battery charger case shall be tied to the engine negative terminal/bus, along with the negative output terminal of the battery charger, not at the battery charger case itself., Why do battery chargers require a separate case connection to main AC grounding bus and Engine negative / DC grounding bus? - CORRECT
How far above bilge water level must a battery charger be mounted? - CORRECT ANSWER✔✔24 inches or more (unless waterproof!) How far away from a gasoline tank must a pre-wired battery charger's AC connection plug be located? - CORRECT ANSWER✔✔At least 24 inches T or F: All marine inverters shall utilize an internal or external GFCI on their AC outlets. - CORRECT ANSWER✔✔False. (only when installed in location that required GFCI per ABYC E-11) T or F: most GFCI outlets can be used in a gasoline engine room - CORRECT ANSWER✔✔False. Most are not ignition protected. T or F: Because the shore power connection is a power source, the neutral conductor should be tied to ground at the point where it comes in to the boat (shore power cable connection) - CORRECT ANSWER✔✔False. Shore power neutral is tied to ground on the shore side.
Tech A says that voltage supplied to the rotor controls the alternator output voltage. Tech B says that the alternator output is proportional to the rotor voltage. Which is correct, A, B, Both or Neither? - CORRECT ANSWER✔✔Both. Tech A says that AC and DC are able to run together down the same conductor. Tech B says this is technically impossible. Which is correct, A, B, neither or both? - CORRECT ANSWER✔✔Tech A According to ABYC, what is the maximum distance allowed between a boat's shore power connection and the main overcurrent protection device? - CORRECT ANSWER✔✔10' What is an ELCI and where is it required to be installed? - CORRECT ANSWER✔✔Equipment Leakage Current Interrupter - within 10 feet of shore power connection unless an isolation transformer is located within 10' of shore power connection. T or F: When more than one option for shore power inlet is installed on a boat, the shore power neutrals shall be tied together on the boat. -
C. Be connected to the engine common positive terminal or its bus D. Be tied to the battery isolator - CORRECT ANSWER✔✔B. Not be grounded on the boat If a customer complains about receiving shocks from her boat when shore power is active, the technican should first test: A. Polarity check of shore cord B. Polarity check of the battery system C. Current Leakage Test D. Converter voltage check - CORRECT ANSWER✔✔A. Polarity check of shore cord 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 - CORRECT 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 - CORRECT ANSWER✔✔C. An open neutral What is a likely cause of non-functioning galvanic isolator? A. a shorted isolator diode B. Improper current rating of the isolator diode C. An on-board neutral-to-ground connection D. All of the above are possible - CORRECT ANSWER✔✔D. All of the above are possible An "open Neutral" conductor in a 240V/120V shore power system will most likely show up as: A. Nuisance tripping of the AC main breaker B. Nuisance tripping of an appliance branch circuit breaker C. A loud humming noise emitted from the TV
