2021 ABYC Marine Electrical - Set Two Page 1 2026-04-09
2021 ABYC Marine Electrical - Set Two
When selecting an inverter, ___ is the primary concern.
A. physical size
B. output capacity
C. connection type
D. power-feed type - correct 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% - correct 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 - correct 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 - correct 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 - correct 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 - correct answer-B. positive
2021 ABYC Marine Electrical - Set Two 1 2021 ABYC Marine Electrical - Set Two.pdf
, 2021 ABYC Marine Electrical - Set Two Page 2 2026-04-09
___ 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 - correct 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 - correct 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 - correct 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.
A. gauss meter
B. oscilloscope
C. DVOM multimeter
D. conductance tester - correct answer-A. gauss meter
When installing an inverter in a split bus application, it is important to provide:
A. An isolated hot bus
B. Large inductive loads
C. An isolated neutral bus
D. Both A and C - correct answer-D. Both A and C
The best fuse type to use for the DC feed to an inverter is:
A. AGC
B. Class T
C. ANL
D. MDL - correct answer-B. Class T
On an inverter that does not provide true sine wave output, low-voltage troubleshooting must
be accomplished with a(n) _______- type DVOM.
A. Analog
B. Average responding
C. True RMS
D. Oscillating - correct answer-C. True RMS
2021 ABYC Marine Electrical - Set Two 2 2021 ABYC Marine Electrical - Set Two.pdf
2021 ABYC Marine Electrical - Set Two
When selecting an inverter, ___ is the primary concern.
A. physical size
B. output capacity
C. connection type
D. power-feed type - correct 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% - correct 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 - correct 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 - correct 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 - correct 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 - correct answer-B. positive
2021 ABYC Marine Electrical - Set Two 1 2021 ABYC Marine Electrical - Set Two.pdf
, 2021 ABYC Marine Electrical - Set Two Page 2 2026-04-09
___ 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 - correct 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 - correct 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 - correct 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.
A. gauss meter
B. oscilloscope
C. DVOM multimeter
D. conductance tester - correct answer-A. gauss meter
When installing an inverter in a split bus application, it is important to provide:
A. An isolated hot bus
B. Large inductive loads
C. An isolated neutral bus
D. Both A and C - correct answer-D. Both A and C
The best fuse type to use for the DC feed to an inverter is:
A. AGC
B. Class T
C. ANL
D. MDL - correct answer-B. Class T
On an inverter that does not provide true sine wave output, low-voltage troubleshooting must
be accomplished with a(n) _______- type DVOM.
A. Analog
B. Average responding
C. True RMS
D. Oscillating - correct answer-C. True RMS
2021 ABYC Marine Electrical - Set Two 2 2021 ABYC Marine Electrical - Set Two.pdf
