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Review ( Question & Answers ) Latest 2025
Every 18 inches. - CORRECT ANSWER ✅How often (in inches) shall wire bundles be supported? Insulated Metallic Hanger Clamps - CORRECT ANSWER ✅What type of clamps are to be used for supporting wire bundles when routed over engines and machinery? 40 lbs (E-11 Table XV) - CORRECT ANSWER ✅What tensile force must a 10 Gauge crimp connector withstand for one minute? 36 inches - CORRECT ANSWER ✅What is the max allowed unsupported cable length for battery cables? True - CORRECT ANSWER ✅T or F: Running AC and DC conductors together is allowed so long as the AC conductors are sheathed. C. Unwanted open - CORRECT ANSWER ✅The most common electrical circuit problem in marine applications is: A. Short circuits B. Too much continuity C. Unwanted open D. Inter circuit Short
Review ( Question & Answers ) Latest 2025
D. Heat - CORRECT ANSWER ✅The primary by-product of excessive electrical resistance is: A. Increased Amperage B. Increased Voltage C. Reduced Ambient Temperature D. Heat 1 HP = 746 Watts - CORRECT ANSWER ✅One HP = how many watts? D. TDR (time-domain reflectometer) - CORRECT ANSWER ✅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) 0 AWG - CORRECT ANSWER ✅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)?
Review ( Question & Answers ) Latest 2025
1 inch, 90 lbs or 2x the battery weight, for 1 minute in each direction. - CORRECT ANSWER ✅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 ANSWER ✅T or F: it is ok to install batteries directly below an uninterrupted fuel line? Must be protected with dielectric insulating material - CORRECT ANSWER ✅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 ANSWER ✅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 ANSWER ✅According to ABYC, what is the minimum battery reserve capacity? 32 degrees F, 30 seconds, 7.2V - CORRECT ANSWER ✅Define: Marine Cranking Amps = the discharge load, in amperes, that a new, fully-
Review ( Question & Answers ) Latest 2025
charged battery at _____ degrees F can deliver for ______ seconds while maintaining a voltage of _____ volts (for a 12 v battery). 0 degrees F, 30 seconds, 7.2V - CORRECT ANSWER ✅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 ANSWER ✅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 ANSWER ✅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 ANSWER ✅What is the minimum ampere interrupting capacity (AIC) for main overcurrent protection on a battery bank rated at 12 V, 1500 CCA?
Review ( Question & Answers ) Latest 2025
B. 14.5 V
C. 14.1 V
D. 13.2 Vll 0.050 points of specific gravity below other cells = bad cell. - CORRECT ANSWER ✅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 ANSWER ✅When testing a wet-cell battery with a hydrometer, what reading indicates a fully charged battery? 50% - CORRECT ANSWER ✅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? C. Between 150% and 200% - CORRECT ANSWER ✅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%
Review ( Question & Answers ) Latest 2025
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., - CORRECT ANSWER ✅T or F: A battery charger case shall be tied to the DC negative output terminal at the battery charger. In case of an internal short to the case, the AC grounding wire would not carry enough current. - CORRECT ANSWER ✅Why do battery chargers require a separate case connection to main AC grounding bus and Engine negative / DC grounding bus? No smaller than 1 size below the DC current carrying conductors between the charger and batteries - provided OC protection on positive DC output is no greater than 135% of DC grounding cable ampacity and conductor is no smaller than 16 AWG. - CORRECT ANSWER ✅What is the minimal wire size required for a battery charger case connection to DC ground/engine negative? Class T fuse rated for appropriate AIC - CORRECT ANSWER ✅What device is typically found to satisfy the required OC protection between a battery charger and the batteries? Batteries will feed back into solar array or wind generator coil and discharge (possibly damage). Note: many voltage regulators have integral blocking diodes. - CORRECT ANSWER ✅What may happen to a
Review ( Question & Answers ) Latest 2025
alternator output is proportional to the rotor voltage. Which is correct, A, B, Both or Neither? Tech A - CORRECT ANSWER ✅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? 10' - CORRECT ANSWER ✅According to ABYC, what is the maximum distance allowed between a boat's shore power connection and the main overcurrent protection device? Equipment Leakage Current Interrupter - within 10 feet of shore power connection unless an isolation transformer is located within 10' of shore power connection. - CORRECT ANSWER ✅What is an ELCI and where is it required to be installed? False, they must be isolated to prevent shock hazard at the unutilizd shore power connector pins. - CORRECT ANSWER ✅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. At least 135% of isloator's nominal rating. (A-28.11.1) - CORRECT ANSWER ✅What ampacity is required for wire and terminals connecting a galvanic islolator?
Review ( Question & Answers ) Latest 2025
Ampacity < 20 Amps, voltage drop across terminals < 50 mV @ 20 A flow, no separation with a one-minute pull of 6 lb force. - CORRECT ANSWER ✅What is the general rule for use of friction connectors?
25 degrees above ambient - CORRECT ANSWER ✅When measuring temperature to determine potential electrical issues involving excessive connector resistance, what is the threshold for concern? B. Not be grounded on the boat - CORRECT ANSWER ✅According to the ABYC, the shore-power grounded conductor should: A. Be connected to the AC neutral B. Not be grounded on the boat C. Be connected to the engine common positive terminal or its bus D. Be tied to the battery isolator A. Polarity check of shore cord - CORRECT ANSWER ✅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
Review ( Question & Answers ) Latest 2025
D. All of the above are possible D. Burned out 120V appliance - CORRECT ANSWER ✅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 D. Burned out 120V appliance True (provided the generator's self-limiting current, AKA "overload current", does not exceed 120% of it's rated current output) - CORRECT ANSWER ✅T or F: Generators that are "self-limiting" do not require overcurrent protection if the conductors used are of sufficient ampacity and sized for maximum current available. Mega ohm meter (AKA "merger"), 1 M Ohm - CORRECT ANSWER ✅What tool is used to test the insulation integrity of a generator windings and what is the generally accepted Mimimal measurement? C. Excessive voltage drop across the remote starter switch - CORRECT ANSWER ✅A customer complains that her generator will start from the local control panel at the generator, but not from the remote
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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 B. Faulty exciter winding / diode rectifier circuit - CORRECT ANSWER ✅On a brushless generator, a possible cause for low AC voltage output under load could be: A. High engine RPM B. Faulty exciter winding / diode rectifier circuit C. Faulty output circuit breaker D. Excessively high DC voltage supply A. Tech A - CORRECT ANSWER ✅Tech A says the ABYC has pull-test requirement for wiring connecting the generator to onboard circuits. Tech B says pull-test requirements are dictated by the generator manufacture. Which one is correct? A. Tech A B. Tech B C. Both Techs
Review ( Question & Answers ) Latest 2025
inches, the allowable ampacity of each conductor must be derated based on the table found within standard E- True (E-11.14.1.3.7.2) - CORRECT ANSWER ✅T or F: The AC grounding conductor shall be permitted to be one size smaller than the current carrying conductors on circuits rated greater than 30 Amps B. Tech B - CORRECT ANSWER ✅The A says the a faulty circuit breaker could require an overhaul. Tech B says that circuit breakers used in recreational marine applications must be replaced if found defective. Who's right? A. Tech A B. Tech B C. Both may be correct, depending on circumstances D. Neither B. 3% - CORRECT ANSWER ✅The maximum allowable voltage drop permitted for panel board DC feeders is: A. 2% B. 3% C. 10% D. 15%
Review ( Question & Answers ) Latest 2025
True - CORRECT ANSWER ✅T or F: Solid (non-stranded) conductors are not allowed for AC wiring anywhere on a boat. False. Auto-reset is not allowed. - CORRECT ANSWER ✅T or F: magnetic transformers with integrated secondary-side overcurrent protection and automatically resetting thermal overload protection are ABYC compliant. C. Continuity - CORRECT ANSWER ✅To test a 120V AC element in a hot water heater, the tech may run a _____ test. A. Voltage B. Capacitance C. Continuity D. Inductance B. Inside an enclosure requiring the use of hand-tools to open - CORRECT ANSWER ✅All terminations and junctions for AC conductors must be installed: A. in free air to allow for proper ventilation B. Inside an enclosure requiring the use of hand-tools to open C. In conduit D. In snap-covered junction boxes
Review ( Question & Answers ) Latest 2025
600 Watts for 15-amp circuit, 1000 Watts for 20-amp circuit (E- 11.13.3.4) - CORRECT ANSWER ✅For a branch circuit supplying both receptacle loads and permanently connected loads, what is the maximum recommended permanent load for 15-amp circuit? For 20- amp circuit? 2 Watts / sq. ft. (E-11.8.2.2.1.1) - CORRECT ANSWER ✅When calculating AC loads, what is the recommended wattage per square foot of living area? 1500 Watts / 20 A circuit (E-11.8.2.2.1.2) - CORRECT ANSWER ✅When calculating AC loads for small galley appliances, how many watts should be used for each 20 amp circuit? True - CORRECT ANSWER ✅T or F: when installing a remote solenoid for switching high-current draws like windlass, bow-thruster, etc, a separate appropriately sized overcurrent protection must be in place for both the low-current and high-current wiring of the solenoid. As the motor heats up, winding resistance increases causing a corresponding decrease in current draw. Fire hazard. Thermal protection device recommended in motors! - CORRECT ANSWER ✅Describe the reason why a locked-rotor motor may not trip an overcurrent protection device.
Review ( Question & Answers ) Latest 2025
seven hours (E-11.10.1.3.1) - CORRECT ANSWER ✅For how long must a motor be able to sustain a locked rotor condition without inducing a fire hazard? True - CORRECT ANSWER ✅T or F: if no standard rating OC protection device is available which equals 100% of the allowable current for the conductor being protected, the next larger rating, up to 150% of the conductor ampacity, may bee used - unless the load is a motor. On diesels, the oil pressure sender may be used to switch alternator on/off and the trigger the tachometer. - CORRECT ANSWER ✅Describe why a non-functional tachometer and charging system on a diesel engine may be caused by a failed oil pressure sending unit. False - CORRECT ANSWER ✅True or False: AC receptacles may be used for DC service, provided they are properly labeled. B. Tech B - CORRECT ANSWER ✅Tech A says that combined AC/DC panel boards are grounded via the DC negative bus. Tech B says that such panel boards should be grounded to the AC grounding bus. Which tech is right? A. Tech A B. Tech B C. Both techs are correct
