ABYC Marine Electrical Certification Exam Review Questions and Answers(A+ Solution guide)

How often (in inches) shall wire bundles be supported? - Answer-Every 18 inches. What type of clamps are to be used for supporting wire bundles when routed over engines and machinery? - Answer-Insulated Metallic Hanger Clamps What tensile force must a 10 Gauge crimp connector withstand for one minute? - Answer-40 lbs (E- 11 Table XV) What is the max allowed unsupported cable length for battery cables? - Answer-36 inches T or F: Running AC and DC conductors together is allowed so long as the AC conductors are sheathed. - Answer-True The most common electrical circuit problem in marine applications is: A. Short circuits B. Too much continuity C. Unwanted open D. Inter circuit Short - Answer-C. Unwanted open The primary by-product of excessive electrical resistance is: A. Increased Amperage B. Increased Voltage C. Reduced Ambient Temperature D. Heat - Answer-D. Heat One HP = how many watts? - Answer-1 HP = 746 Watts What is the preferred tool for tracing shorted and open circuits? A. Ohm meterB. Amp clamp C. Volt meter D. TDR (time-domain reflectometer) - Answer-D. TDR (time-domain 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)? - Answer-0 AWG DC grounded conductors on new boats that are also equipped with AC systems should use what color insulated wire? - Answer-Yellow What is the smallest guage wire allowed for unsheathed wire runs through the boat? - 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. - 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? - Answer-Cranking What tool and common household staple are used to clean battery terminals? - Answer-Wire brush and backing soda. Why might a fully-discharged wet-cell type battery freeze? - Answer-Most of the sulfuric acid has been absorbed into the lead plates, leaving mostly water in the electrolyte. 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? - Answer-1 inch, 90 lbs or 2x the battery weight, for 1 minute in each direction. T or F: it is ok to install batteries directly below an uninterrupted f