ABYC MARINE ELECTRICAL EXAM |ACTUAL
QUESTIONS AND VERIFIED ANSWERS|BRAND NEW
2026-2027 UPDATE|GRADED A+
Question 1
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
Question 2
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%
Question 3
The ___ defines how much amperage a fuse or breaker can be subjected to without
locking or welding itself into the permanently closed position.
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,A. maximum working cycle
B. nominal rating
C. maximum allowable charge
D. AIC rating
CORRECT ANSWER
D. AIC rating
Question 4
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
Question 5
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
2
@THE STUDY VAULT
, C. Branch
Question 6
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
Question 7
___ 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
Question 8
3
@THE STUDY VAULT
, 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)
Question 9
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
Question 10
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
4
@THE STUDY VAULT
QUESTIONS AND VERIFIED ANSWERS|BRAND NEW
2026-2027 UPDATE|GRADED A+
Question 1
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
Question 2
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%
Question 3
The ___ defines how much amperage a fuse or breaker can be subjected to without
locking or welding itself into the permanently closed position.
1
@THE STUDY VAULT
,A. maximum working cycle
B. nominal rating
C. maximum allowable charge
D. AIC rating
CORRECT ANSWER
D. AIC rating
Question 4
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
Question 5
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
2
@THE STUDY VAULT
, C. Branch
Question 6
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
Question 7
___ 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
Question 8
3
@THE STUDY VAULT
, 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)
Question 9
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
Question 10
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
4
@THE STUDY VAULT
