ABYC MARINE ELECTRICAL 2025
EXAM QUESTIONS WITH CORRECT
ANSWERS
While there's some variation among countries, in North America the preferred colors for
120-volt AC are ___.
A. red, blue, and black
B. white, light blue, and brown
C. black, white, and green
D. red, orange, and blue - Answer-C. black, white, and green
If conductor color coding is not enough, alternative labeling may be used for DC
conductors as long as a ___ is provided in the boat's documentation.
A. line diagram
B. general note or sheet note
C. clear photograph of the newly installed labeling
D. wiring diagram or wiring legend - Answer-D. wiring diagram or wiring legend
When AC and DC conductors converge at the back of panelboards, the use of ___
insulation for DC negative conductors gives a quick and distinctive differentiation
between DC negative and AC hot conductors. - Answer-Yellow
The insulation on grounding conductors should be either ___.
A white or yellow
B blue or light blue
C green or green with a yellow stripe
D black or black with a red stripe - Answer-C green or green with a yellow stripe
A time-domain reflectometer (TDR) can confirm continuity and ___.
A pinpoint the location of a short or open circuit
B decrease the electrical conductivity of a material
C display the amount of resistance present in a circuit
D repair any short circuits that may be present - Answer-A pinpoint the location of a
short or open circuit
Most wiring-related problems occur ___.
A. at the power source
B. at termination points
C. in short runs
D. in long runs - Answer-B. at termination points
, For battery cable gauge sizes, the tool of choice for terminations is referred to as a ___,
which leaves a square crimp on the terminal.
A. battery connector
B. signal generator
C. box cutter
D. box crimper - Answer-D. box crimper
Minimal support for wire bundles should occur at least every ___ inches, according to
Standard E-11.14.4.1.9. - Answer-18 inches
DC derating tables for voltage drop are specified for both a ___ % and ___% maximum
voltage drop. - Answer-3% and a 10%
Voltage drop is not considered with AC because ___.
A. voltage drop does not occur in AC circuits
B. the length of wire runs for AC circuits is not typically long enough to be a significant
factor for performance
C. it is canceled out by the other phases of current which are not present in DC circuits
D. AC circuit conductors have better insulation than DC circuit conductors - Answer-B.
the length of wire runs for AC circuits is not typically long enough to be a significant
factor for performance
Conductors used for lighting, other than navigation lights, and other circuits where
voltage drop is not critical, shall be sized for a voltage drop not to exceed ___. -
Answer-10%
When AC and DC conductors are run together, AC conductors shall be ___.
A. rated for a much higher voltage than the DC conductors
B. present in a 3:1 ratio to DC conductors
C. bundled around the DC conductors to provide insulation for the DC conductors
D. sheathed separately from DC conductors - Answer-D. sheathed separately from DC
conductors
No more than ___ terminals shall be secured to any one terminal stud. - Answer-Four
Most technicians think of the ungrounded conductor as ___ when working with either
AC or DC circuits.
A. the AC neutral
B. not normally current-carrying
C. the negative return conductor
D. the hot wire - Answer-D. the hot wire
A disadvantage of a time-domain reflectometer (TDR) is that it will not ___.
A. function on short runs
EXAM QUESTIONS WITH CORRECT
ANSWERS
While there's some variation among countries, in North America the preferred colors for
120-volt AC are ___.
A. red, blue, and black
B. white, light blue, and brown
C. black, white, and green
D. red, orange, and blue - Answer-C. black, white, and green
If conductor color coding is not enough, alternative labeling may be used for DC
conductors as long as a ___ is provided in the boat's documentation.
A. line diagram
B. general note or sheet note
C. clear photograph of the newly installed labeling
D. wiring diagram or wiring legend - Answer-D. wiring diagram or wiring legend
When AC and DC conductors converge at the back of panelboards, the use of ___
insulation for DC negative conductors gives a quick and distinctive differentiation
between DC negative and AC hot conductors. - Answer-Yellow
The insulation on grounding conductors should be either ___.
A white or yellow
B blue or light blue
C green or green with a yellow stripe
D black or black with a red stripe - Answer-C green or green with a yellow stripe
A time-domain reflectometer (TDR) can confirm continuity and ___.
A pinpoint the location of a short or open circuit
B decrease the electrical conductivity of a material
C display the amount of resistance present in a circuit
D repair any short circuits that may be present - Answer-A pinpoint the location of a
short or open circuit
Most wiring-related problems occur ___.
A. at the power source
B. at termination points
C. in short runs
D. in long runs - Answer-B. at termination points
, For battery cable gauge sizes, the tool of choice for terminations is referred to as a ___,
which leaves a square crimp on the terminal.
A. battery connector
B. signal generator
C. box cutter
D. box crimper - Answer-D. box crimper
Minimal support for wire bundles should occur at least every ___ inches, according to
Standard E-11.14.4.1.9. - Answer-18 inches
DC derating tables for voltage drop are specified for both a ___ % and ___% maximum
voltage drop. - Answer-3% and a 10%
Voltage drop is not considered with AC because ___.
A. voltage drop does not occur in AC circuits
B. the length of wire runs for AC circuits is not typically long enough to be a significant
factor for performance
C. it is canceled out by the other phases of current which are not present in DC circuits
D. AC circuit conductors have better insulation than DC circuit conductors - Answer-B.
the length of wire runs for AC circuits is not typically long enough to be a significant
factor for performance
Conductors used for lighting, other than navigation lights, and other circuits where
voltage drop is not critical, shall be sized for a voltage drop not to exceed ___. -
Answer-10%
When AC and DC conductors are run together, AC conductors shall be ___.
A. rated for a much higher voltage than the DC conductors
B. present in a 3:1 ratio to DC conductors
C. bundled around the DC conductors to provide insulation for the DC conductors
D. sheathed separately from DC conductors - Answer-D. sheathed separately from DC
conductors
No more than ___ terminals shall be secured to any one terminal stud. - Answer-Four
Most technicians think of the ungrounded conductor as ___ when working with either
AC or DC circuits.
A. the AC neutral
B. not normally current-carrying
C. the negative return conductor
D. the hot wire - Answer-D. the hot wire
A disadvantage of a time-domain reflectometer (TDR) is that it will not ___.
A. function on short runs
