Download ABYC MARINE ELECTRICAL CERTIFICATION Exam Practice Test Bank With 500 Real Exam Practice and more Exams Public Health in PDF only on Docsity!
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ABYC MARINE ELECTRICAL CERTIFICATION Exam Practice
Test Bank With 500 Real Exam Practice Questions and Correct
Verified Answers| ABYC MARINE ELECTRICAL
CERTIFICATION Prep (Latest!)
C. 14.1 V ......answer.....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 0.050 points of specific gravity below other cells = bad cell. ......answer.....When testing a wet-cell battery with a hydrometer, what threshold is used to determine a bad cell?
1.260 - 1.285 (temperature dependent) ......answer.....When testing a wet-cell battery with a hydrometer, what reading indicates a fully charged battery? 50% ......answer.....When testing a fully charged start battery for capacity with a load tester, what % of CCA rating should be induced by the load to test resulting voltage? C. Between 150% and 200% ......answer.....Most engine-driven alternators are optimally spun at what percentage of engine RPMs? A. Between 10% and 50% B. Less than 10% C. Between 150% and 200% D. Greater than 200% False. the battery charger case shall be tied to the engine negative terminal/bus, along with the negative output terminal of the battery charger, not at the battery charger case itself., ......answer.....T or F: A battery charger case shall be tied to the DC negative output terminal at the battery charger. In case of an internal short to the case, the AC grounding wire would not carry enough current. ......answer.....Why do battery chargers require a separate case connection to main AC grounding bus and Engine negative / DC grounding bus?
False. (only when installed in location that required GFCI per ABYC E-11) ......answer.....T or F: All marine inverters shall utilize an internal or external GFCI on their AC outlets. False. Most are not ignition protected. ......answer.....T or F: most GFCI outlets can be used in a gasoline engine room False. Shore power neutral is tied to ground on the shore side. ......answer.....T or F: Because the shore power connection is a power source, the neutral conductor should be tied to ground at the point where it comes in to the boat (shore power cable connection) Both. ......answer.....Tech A says that voltage supplied to the rotor controls the alternator output voltage. Tech B says that the alternator output is proportional to the rotor voltage. Which is correct, A, B, Both or Neither? Tech A ......answer.....Tech A says that AC and DC are able to run together down the same conductor. Tech B says this is technically impossible. Which is correct, A, B, neither or both? 10' ......answer.....According to ABYC, what is the maximum distance allowed between a boat's shore power connection and the main overcurrent protection device?
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Equipment Leakage Current Interrupter - within 10 feet of shore power connection unless an isolation transformer is located within 10' of shore power connection. ......answer.....What is an ELCI and where is it required to be installed? False, they must be isolated to prevent shock hazard at the unutilizd shore power connector pins. ......answer.....T or F: When more than one option for shore power inlet is installed on a boat, the shore power neutrals shall be tied together on the boat. At least 135% of isloator's nominal rating. (A-28.11.1) ......answer.....What ampacity is required for wire and terminals connecting a galvanic islolator? Ampacity < 20 Amps, voltage drop across terminals < 50 mV @ 20 A flow, no separation with a one- minute pull of 6 lb force. ......answer.....What is the general rule for use of friction connectors?
25 degrees above ambient ......answer.....When measuring temperature to determine potential electrical issues involving excessive connector resistance, what is the threshold for concern? B. Not be grounded on the boat ......answer.....According to the ABYC, the shore-power grounded conductor should: A. Be connected to the AC neutral
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C. An open neutral ......answer.....A customer notes a reverse-polarity problem. All of the following are likely causes, except: A. Improperly wired shore power cord B. Improperly wired shore power inlet receptacle C. An open neutral D. Reversal of the hot and neutral conductors in the AC panel feeder cable D. All of the above are possible ......answer.....What is a likely cause of nonfunctioning galvanic isolator? A. a shorted isolator diode B. Improper current rating of the isolator diode C. An on-board neutral-to-ground connection D. All of the above are possible D. Burned out 120V appliance ......answer.....An "open Neutral" conductor in a 240V/120V shore power system will most likely show up as: A. Nuisance tripping of the AC main breaker B. Nuisance tripping of an appliance branch circuit breaker
C. A loud humming noise emitted from the TV D. Burned out 120V appliance
B. Low voltage at the starter battery C. Excessive voltage drop across the remote starter switch P a g e D. Loose battery cable clamp at the starter battery B. Faulty exciter winding / diode rectifier circuit ......answer.....On a brushless generator, a possible cause for low AC voltage output under load could be: A. High engine RPM B. Faulty exciter winding / diode rectifier circuit C. Faulty output circuit breaker D. Excessively high DC voltage supply
11 | A. Tech A ......answer.....Tech A says the ABYC has pull-test requirement for wiring connecting the generator to onboard circuits. Tech B says pull-test requirements are dictated by the generator manufacture. Which one is correct? A. Tech A B. Tech B C. Both Techs D. Neither Tech True ......answer.....T or F: metal AC panel boards must be grounded.
24 inches (E-11.14.1.3.7.1) ......answer.....When multiple DC conductors are bundled together for a distance of greater than ____ inches, the allowable ampacity of each conductor must be derated based on the table found within standard E- 11 True (E-11.14.1.3.7.2) ......answer.....T or F: The AC grounding conductor shall be permitted to be one size smaller than the current carrying conductors on circuits rated greater than 30 Amps B. Tech B ......answer.....The A says the a faulty circuit breaker could require an overhaul. Tech B says that circuit breakers used in recreational marine applications must be replaced if found defective. Who's right? A. Tech A
B. Tech B C. Both may be correct, depending on circumstances D. Neither B. 3% ......answer.....The maximum allowable voltage drop permitted for panel board DC feeders is: A. 2% B. 3% C. 10% D. 15%
B. Inside an enclosure requiring the use of hand-tools to open ......answer.....All terminations and junctions for AC conductors must be installed: A. in free air to allow for proper ventilation B. Inside an enclosure requiring the use of hand-tools to open C. In conduit D. In snap-covered junction boxes D. TDR ......answer.....Wha is the best tool to use for locating short-circuits? A. Megger B. Amp Clamp C. DVM
D. TDR
A. Cooler ......answer.....High frequency transformers typically run _____ than traditional magnetic transformers. A. Cooler B. Hotter C. Faster D. Slower 6 lbs for 1 minute (E-11.13.2.3) ......answer.....What is the pull-test requirement for DC plug/receptacles?
1500 Watts / 20 A circuit (E-11.8.2.2.1.2) ......answer.....When calculating AC loads for small galley appliances, how many watts should be used for each 20 amp circuit? True ......answer.....T or F: when installing a remote solenoid for switching high- current draws like windlass, bow-thruster, etc, a separate appropriately sized overcurrent protection must be in place for both the low-current and high- current wiring of the solenoid. As the motor heats up, winding resistance increases causing a corresponding decrease in current draw. Fire hazard. Thermal protection device recommended in motors! ......answer.....Describe the reason why a lockedrotor motor may not trip an overcurrent protection device. seven hours (E-11.10.1.3.1) ......answer.....For how long must a motor be able to sustain a locked rotor condition without inducing a fire hazard?
True ......answer.....T or F: if no standard rating OC protection device is available which equals 100% of the allowable current for the conductor being protected, the next larger rating, up to 150% of the conductor ampacity, may bee used - unless the load is a motor. On diesels, the oil pressure sender may be used to switch alternator on/off and the trigger the tachometer. ......answer.....Describe why a non-functional tachometer and charging system on a diesel engine may be caused by a failed oil pressure sending unit. False ......answer.....True or False: AC receptacles may be used for DC service, provided they are properly labeled.
