ABYC Electrical Questions with 100% Correct Answers

2 or More batteries connected in series provides_________, or in parallel to provide_________ - Answer-higher voltage increased capacity Batteries gas of what - Answer-hydrogen If an AC system is installed the main AC system grounding bus shall be connected to what? - Answerthe engine negative terminal or the DC main negative bus Difference between an isolation transformer and polarization transformer - Answer-isolation transformer isolates all current crying AC system conductors and the AC drowning conductor, Polarization transformers do not isolate the AC grounding conductor. 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 - Answer-800 100 with 120Volt systems, the _______ and ________ get tied together at an AC power source, but only at a source of AC power. - Answer-green white Inverters are only tied together when...... - Answer-the inverter is operating in AC production mode 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 - Answer-10 feet All AC cables from the shore power inlet to the main shore power breakers shall be in conduit or supported by means of____________ - Answer-Metal straps or clamps Boats with more than one shore power inlet should never connect ________ together from multiple inlets. - Answer-neutrals What is the only device permitted to be installed in series with the AC grounding conductor - AnswerGalvanic isolatorDurring an installation of an galvanic isolator conductors shall be supported and/or clamped to relive strain within ______inches of isolator case - Answer-6 The galvanic isolator shall be provided with wiring terminals or wire leads for connection, having an ampacity that is __________ percent of its nominal rating. - Answer-135 Isolation transformers offer engineers the ability to do what? - Answer-step up or step down voltage from one side of the transformer to the other What does a polarization transformer automatically do? - Answer-automatically deals with dock-side polarity issues Reverse polarity indicating devices shall respond to the reversal of the ____________ and ________ conductors. - Answer-Ungrounded black grounded white The total impedance of polarity indicating and production devices connected between normal current carrying conductors and the grounding conductor shall not be less than __________ - Answer-25,000 ohms One tool used to confirm the integrity of electrical supply at the dock is ________________ - Answer-Ideal SureTest In Split 240/120V systems one cause for AC equipment to fail depending on unbalanced legs is..... - Answer-open neutral If there is low voltage at AC generator you should.... - Answer-check voltage, verify correct engine rpm, check all connections and wire termination positions for integrity if there is high voltage at AC generator you should.... - Answer-check frequency for normal range, if possible, adjust voltage regulator and verify correct engine rpm and governor setting if there is erratic voltage at AC generator you should.... - Answer-check slip rings they could be worn or burned if there is erratic frequency at AC generator you should..... - Answer-check for cycling loads, If erratic with all loads off, check governor functionif there is high frequency at AC generator you should.... - Answer-check the governor could be out of adjustment Brushless generators use what - Answer-auxiliary set of windings called exciter windings A device used to confirm the integrity of the winding insulation inside generator or motor is called a - Answer-megohmmeter An acceptable reading when using a megommeter to test winding insulation is - Answer-1 megohm or more 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... - Answer-600volts