ABYC Marine Electrical Certification Exam Review!

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 meter B. 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 Cra