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A comprehensive set of questions and answers related to abyc marine electrical certification. It covers various aspects of marine electrical systems, including battery charging, alternator operation, and inverter usage. Valuable for individuals preparing for abyc marine electrical certification exams or seeking to enhance their knowledge of marine electrical systems.
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What is the max voltage to charge most gell cell batteries? - correct answer 14. volts Range of specific gravity in fully charged 12v battery? - correct answer 1.260 to
Fully Charged battery is _____ volts. - correct answer 12. Batteries create ______ gas. - correct answer Hydrogen Two twelve volt batteries in parallel will create ________ volts - correct answer 12.6 (amperage doubles) Two 12V batteries in series creates _______ volts, but amperage remains the same - correct answer 24V This type of battery is characterized by thicker plates and is meant for moderate loads for long periods. - correct answer Deep Cycle This appliance is used to derive 12v from 24v system (or visa versa) and equalize batteries charge and discharge rates. - correct answer Battery Equalizer Battery boxes must be _______________ due to release of gasses. - correct answer vented overboard Over time switching solenoids tend to wear out creating an open circuit and .... - correct answer One of the batteries does not charge and goes dead.
A drop in specific gravity of _____ (from the other cells) on a battery test is indicative of a bad cell. - correct answer 0. Battery charger selection should be based on __________ type. - correct answer Battery Bulging battery sides and a rotten egg smell are signs of what? - correct answer Over charging Best practice to prevent corrosion on battery terminals is what? - correct answer Spray a dry film corrosion inhibitor. Wing nuts are allowed on battery terminals for wires ______ AWG and smaller. - correct answer 8 The battery switch rating shall equal the amps of the connected overcurrent protection or the ________ whichever is less. - correct answer Feeder Cable In a flooded cell battery, fluid should be checked. - correct answer Frequently Batteries in a state of ______ can freeze and become a potential hazard [go boom]. - correct answer Discharge Circuit Breakers should be of the _______ variety. - correct answer trip free When can connections to batteries can be made with spring loaded (alligator) fasteners? - correct answer Never Batteries must be securely installed and allow no more than ______ (inches)of movement in any direction - correct answer 1"
A traditional load test requires placing a load equal to ____% of the batteries CCA for ______ seconds. - correct answer 50%, 15 seconds A ________ tester is often required by manufacturers to determine battery replacement - correct answer Conductance A _______ is what changes the AC power from the alternator to usable DC power. - correct answer rectifier (bridge rectifier) An AC leakage of up to _______ past the diodes of an alternators rectifier is considered normal. - correct answer 0.4 V The following are part of an Alternator except __________ Stator Rotor AIC Voltage regulator Rectifier - correct answer AIC When mounting an alternator, proper consideration should be made for - correct answer •Wire Guage •Alternator RPM •Alternator voltage sensing & Cable connection •Proper belt tension/pulley alignment On a battery charger/inverter output the DC case ground should be no more than ______ Guage size less than DC current carrying conductor - correct answer 1 Class T fuses are considered what? - correct answer Slow Blow
When testing a battery charger a rise of _______ under load, from your battery baseline indicates charger is operable. - correct answer 0.5 V When selecting a location to install a battery chargers/inverter consideration should be made for what?
True or false? A galvanic isolators blocks low level AC current - correct answer False, it blocks DC, AC will flow through