2024 ABYC Marine Electrical - Set Two Correct Questions & Answers

When selecting an inverter, ___ is the primary concern. A. physical size B. output capacity C. connection type D. power-feed type - ANSWER B. output capacity The efficiency loss through inverters is typically between ___, so a battery charger cannot be powered from one and create a perpetual system. A. 0.5% to 3% B. 5% to 15% C. 20% to 25% D. 35% to 50% - ANSWER B. 5% to 15% The ___ defines how much amperage a fuse or breaker can be subjected to without locking or welding itself into the permanently closed position. A. maximum working cycle B. nominal rating C. maximum allowable charge D. AIC rating - ANSWER D. AIC rating The ABYC requires a(n) ___ in any DC feed from a battery bank with a capacity over 800 CCA. A. battery switch B. grounding cable C. overcurrent protection device D. inverter - ANSWER A. battery switch The main circuit breaker(s) are considered to be the first breaker(s) in a circuit connected in series with the battery. All subsequent breakers, including sub-main breakers, connected in series with a main circuit breaker are considered to be "___ circuit breakers." A. trolling B. backup C. branch D. dedicated - ANSWER C. Branch A battery switch shall be installed in the ___ conductor(s) from each battery or battery bank with a CCA rating greater than 800 amperes or 100 Ah if CCA is unavailable. A. neutral B. positive C. negative D. grounded E. Band - ANSWER B. positive ___ of the AC output waveform from some inverters may affect the operation of some GFCI devices. A. Harmonic distortion B. Electromagnetic induction C. Voltage drop D. Electronic noise - ANSWER A. Harmonic distortion Since some inverters do not necessarily output a true sine waveform of AC, a DVOM that uses a(n) ___ algorithm for interpreting what it "sees" is a must. A. simple recursive B. backtracking C. true root mean square (RMS) D. approximate - ANSWER C. true root mean square (RMS) Gear that functions normally when run from a shore power source but either functions erratically or not at all when run from an inverter (or generator) is almost always a(n) ___ issue. A. subsystem B. wiring C. overheating D. waveform - ANSWER D. waveform A(n) ___ reads the strength of a magnetic field emission and can be used to establish a "safe zone of separation" between inverters and magnetically sensitive equipment.