ABYC Marine Electrical Certification Exam Review Final Questions and Answers Already Graded A+ 100% Excel

ABYC Marine Electrical Certification Exam Review Final Questions and Answers Already Graded A+ 100% Excel How often (in inches) shall wire bundles be supported? - CORRECT ANSWER-Every 18 inches. What type of clamps are to be used for supporting wire bundles when routed over engines and machinery? - CORRECT ANSWER-Insulated Metallic Hanger Clamps What tensile force must a 10 Gauge crimp connector withstand for one minute? - CORRECT ANSWER-40 lbs (E-11 Table XV) What is the max allowed unsupported cable length for battery cables? - CORRECT ANSWER-36 inches T or F: Running AC and DC conductors together is allowed so long as the AC conductors are sheathed. - CORRECT 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 - CORRECT 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 - 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 (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)? - 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. Why might a fully-discharged wet-cell type battery freeze? - CORRECT 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? - CORRECT 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 fuel line? - CORRECT ANSWER-True What provision must be in place on any fuel line located within 12 inches of a battery terminals? - CORRECT ANSWER-Must be protected with dielectric insulating material 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) - CORRECT 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 is the minimum ampere interrupting capacity (AIC) for main overcurrent protection on a battery bank rated at 12 V, 1500 CCA? - CORRECT ANSWER-AIC = 5000 Amps (E-11 table IV-A) What is the minimum ampere interrupting capacity (AIC) for main overcurrent protection on a battery bank rated at more than 2200 CCA or more than 500 Ahr? - CORRECT ANSWER-AIC = 2X mnfg's short-circuit rating or 100X nominal Ahr rating. T or F: it is ok to mount a battery switch inside an engine room, because ABYC startes that it must be located as close to the batteries as practical. - CORRECT ANSWER-False. "Readily accessible" defines entry into the engine room in an emergency as dangerous - use a remote battery switch. Explain the "7-40-72" rule - CORRECT ANSWER-Overcurrent protection must be located withing 7 inches of the power source unless contained within a sheath, in which case it may be up to 40 inches away. If the power source is a battery and the conductors are sheathed, OC may be up to 72 inches away. 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)