ABYC Marine Electrical Certification Exam Review Questions with 100% Correct Answers

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 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)? Yellow Correct Answer DC grounded conductors on new boats that are also equipped with AC systems should use what color insulated wire? 16 AWG Correct Answer 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 Answer 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 Answer Which type of battery generally recharges faster? Deep cycle or cranking? Wire brush and backing soda. Correct Answer What tool and common household staple are used to clean battery terminals? Most of the sulfuric acid has been absorbed into the lead plates, leaving mostly water in the electrolyte. Correct Answer 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 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-charged battery at _____ degrees F can deliver for ______ seconds while maintaining a voltage of _____ volts (for a 12 v battery).