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American Boat and Yacht Council (ABYC) Electrical Systems: Questions and Answers, Exams of Biology

Howard Community CollegeBiology

A comprehensive q&a resource covering various aspects of boat electrical systems, as per abyc standards. it delves into topics such as battery configurations, shore power systems, grounding, and generator maintenance, offering valuable insights for students and professionals in marine engineering or electrical systems.

Typology: Exams

2024/2025

Available from 05/13/2025

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American Boat and Yacht
Council ABYC Electrical
questions and answers
higher voltage increased capacity - answer 2 or More batteries connected in series
provides_________, or in parallel to provide_________
hydrogen - answer Batteries gas of what
the engine negative terminal or the DC main negative bus - answer If an AC system is
installed the main AC system grounding bus shall be connected to what?
isolation transformer isolates all current crying AC system conductors and the AC
drowning conductor, Polarization transformers do not isolate the AC grounding
conductor. - answer Difference between an isolation transformer and polarization
transformer
800 100 - answer A battery switch shall be installed in the positive conductors from
each battery or battery bank with a CCA rating greater than _____amperes or _____Ah if
CCA is unavailable
green white - answer with 120Volt systems, the _______ and ________ get tied together at
an AC power source, but only at a source of AC power.
the inverter is operating in AC production mode - answer Inverters are only tied
together when......
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American Boat and Yacht

Council ABYC Electrical

questions and answers

higher voltage increased capacity - answer 2 or More batteries connected in series provides_________, or in parallel to provide_________ hydrogen - answer Batteries gas of what the engine negative terminal or the DC main negative bus - answer If an AC system is installed the main AC system grounding bus shall be connected to what? isolation transformer isolates all current crying AC system conductors and the AC drowning conductor, Polarization transformers do not isolate the AC grounding conductor. - answer Difference between an isolation transformer and polarization transformer 800 100 - answer A battery switch shall be installed in the positive conductors from each battery or battery bank with a CCA rating greater than _____amperes or _____Ah if CCA is unavailable green white - answer with 120Volt systems, the _______ and ________ get tied together at an AC power source, but only at a source of AC power. the inverter is operating in AC production mode - answer Inverters are only tied together when......

10 feet - answer A standard based issue states that in shore power systems overcorrect protection be located no more than ______ from the point of inlet into the boat Metal straps or clamps - answer All AC cables from the shore power inlet to the main shore power breakers shall be in conduit or supported by means of____________ neutrals - answer Boats with more than one shore power inlet should never connect ________ together from multiple inlets. Galvanic isolator - answer What is the only device permitted to be installed in series with the AC grounding conductor 6 - answer Durring an installation of an galvanic isolator conductors shall be supported and/or clamped to relive strain within ______inches of isolator case 135 - answer The galvanic isolator shall be provided with wiring terminals or wire leads for connection, having an ampacity that is __________ percent of its nominal rating. step up or step down voltage from one side of the transformer to the other - answer Isolation transformers offer engineers the ability to do what? automatically deals with dock-side polarity issues - answer What does a polarization transformer automatically do? Ungrounded black grounded white - answer Reverse polarity indicating devices shall respond to the reversal of the ____________ and ________ conductors.

1 megohm or more - answer An acceptable reading when using a megommeter to test winding insulation is 600volts - answer Where AC and DC conductors are run together or installed in the same terminal box or enclosure the DC conductors shall have a minimum insulation voltage of... balanced - answer multiple legs on 240 volt systems must be.... increases - answer As generator load increases, the rotor field winding voltage also _________. Output is proportional to input low engine rpm - answer Low generator output is usually caused by what? 7 40 - answer Based on Standard A-27 and E-11 non-self limiting generators will need overcorrect protection at either _______ inches or _______ inches from there output terminals. same - answer in a series circuit the amperage draw in the circuit will be the _______ through out the circuit current flow - answer If voltage increases, there will be an increase in _______ decrease - answer If resistance increases, amperage will _________ short circuit to ground - answer The ____________________ is when the hot leas to a device has found a path to ground before current has reached the device.

TDR - answer Tool used to confirm continuity but also pinpoint the location of short circuits and open circuits When you replace old wire the correct process is.... - answer label old wire and fold back out of the way of new wire 18 - answer minimal support for wire bundles should occur at least every _____ inches 36 - answer A notable exception to the 18-inch rule is that for battery cabling, at the battery end, Standard E-11 allows for up to ____inches of unsupported cable. 16 - answer Minimum size of conductors shall be at least _____AWG 18 - answer ________AWG conductors may be used if included with other conductors in a sheath and do not extend more than 30 inches outside the sheath green and white - answer In AC shore power systems the ________ and the _______ wires are tied together only at a source of AC power the inverter is operating in AC production mode - answer Inverters are only tided together when ............ galvanic isolator - answer what is the only device permitted to be installed in series with the AC grounding conductor.

  • answer The galvanic isolator shall be connected in series with the shore power cable in a manner that no other ground conductor will bypass the isolator back to the shore power ground.

slow blow - answer Class T fuses are considered to be the "_______" type to handle amperage surges attributed to motor load start up current draws blocking diods - answer wind generators and solar pannels need _________________ installed in there output conductors 5 15 - answer efficiency loss through inverters is typically between _____% and _______% 100 - answer Backfeed protection shall operate within ______miliseconds of the disconnection of the input AC power source synchronized - answer AC power sources shall be ______________ before paralleling 600 - answer Conductors for AC systems shall have a minimum rating of ______volts 300 - answer Flexible cords for AC systems shall have a minimum rating of _______V 600 - answer Conductors for AC systems shall have a minimum rating of ______volts decrease - answer if resistance increases, amperage must ________ increase - answer if resistance decreases, and voltage remains constant, then average must _____ 10,000 - answer Alternators have a "redline" of approximately ______rpm