ABYC Marine Electrical Certification Exam Review questions with
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verified detailed answers || ||
How often (in inches) shall wire bundles be supported? - ✔✔Every 18 inches.
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What type of clamps are to be used for supporting wire bundles when routed over
|| || || || || || || || || || || || || || ||
engines and machinery? - ✔✔Insulated Metallic Hanger Clamps
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What tensile force must a 10 Gauge crimp connector withstand for one minute? -
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✔✔40 lbs (E-11 Table XV) || || || ||
What is the max allowed unsupported cable length for battery cables? - ✔✔36 inches
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T or F: Running AC and DC conductors together is allowed so long as the AC
|| || || || || || || || || || || || || || || ||
conductors are sheathed. - ✔✔True || || || ||
The most common electrical circuit problem in marine applications is:
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A. Short circuits
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B. Too much continuity
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C. Unwanted open
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D. Inter circuit Short - ✔✔C. Unwanted open
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The primary by-product of excessive electrical resistance is:
|| || || || || || ||
A. Increased Amperage
|| ||
B. Increased Voltage
|| ||
C. Reduced Ambient Temperature
|| || ||
,D. Heat - ✔✔D. Heat
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One HP = how many watts? - ✔✔1 HP = 746 Watts
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What is the preferred tool for tracing shorted and open circuits?
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A. Ohm meter
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B. Amp clamp
|| ||
C. Volt meter
|| ||
D. TDR (time-domain reflectometer) - ✔✔D. TDR (time-domain reflectometer)
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A technician is installing a cable run from the batteries to the main DC panel board on
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a boat as part of a refit. The boat has a 12-volt system and the distance form the panel
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to the batteries is 15 ft. The maximum current draw from the panel is calculated at 90
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amps. What guage cable should be used (minimum)? - ✔✔0 AWG
|| || || || || || || || || || ||
DC grounded conductors on new boats that are also equipped with AC systems should
|| || || || || || || || || || || || || ||
use what color insulated wire? - ✔✔Yellow
|| || || || || ||
What is the smallest guage wire allowed for unsheathed wire runs through the boat? -
|| || || || || || || || || || || || || || ||
✔✔16 AWG ||
T or F: Compared to deep cycle (house) batteries, cranking batteries will have thicker
|| || || || || || || || || || || || || ||
lead plates to facilitate the higher, short-duration current draws. - ✔✔False. Start
|| || || || || || || || || || || ||
batteries have a greater number of thinner plates within each cell.
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Which type of battery generally recharges faster? Deep cycle or cranking? -
|| || || || || || || || || || || ||
✔✔Cranking
,What tool and common household staple are used to clean battery terminals? -
|| || || || || || || || || || || || ||
✔✔Wire brush and backing soda. || || || ||
Why might a fully-discharged wet-cell type battery freeze? - ✔✔Most of the sulfuric
|| || || || || || || || || || || || ||
acid has been absorbed into the lead plates, leaving mostly water in the electrolyte.
|| || || || || || || || || || || || ||
Batteries must be secured to prevent movement of more than ______ inches in any
|| || || || || || || || || || || || || ||
direction when a pulling force of _____ or _____, whichever is less, is applied
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through the center of gravity of the battery for how long? - ✔✔1 inch, 90 lbs or 2x the
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battery weight, for 1 minute in each direction.
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T or F: it is ok to install batteries directly below an uninterrupted fuel line? - ✔✔True
|| || || || || || || || || || || || || || || ||
What provision must be in place on any fuel line located within 12 inches of a battery
|| || || || || || || || || || || || || || || || ||
terminals? - ✔✔Must be protected with dielectric insulating material
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Define: Battery reserve capacity = the number of minutes that a new, fully charged
|| || || || || || || || || || || || || ||
battery at ______ degrees F can be continuously discharged at ______ amps while
|| || || || || || || || || || || || ||
maintaining _____ volts (for a 12 v battery) - ✔✔80 F, 25 Amps, 10.5 Volts
|| || || || || || || || || || || || || ||
According to ABYC, what is the minimum battery reserve capacity? - ✔✔90 minutes
|| || || || || || || || || || || ||
Define: Marine Cranking Amps = the discharge load, in amperes, that a new, fully-
|| || || || || || || || || || || || ||
charged battery at _____ degrees F can deliver for ______ seconds while
|| || || || || || || || || || || ||
maintaining a voltage of _____ volts (for a 12 v battery). - ✔✔32 degrees F, 30
|| || || || || || || || || || || || || || || ||
seconds, 7.2V ||
Define: Cold Cranking Amps = the discharge load, in amperes, that a new, fully-
|| || || || || || || || || || || || ||
charged battery at _____ degrees F can deliver for ______ seconds while
|| || || || || || || || || || || ||
, maintaining a voltage of _____ volts (for a 12 v battery). - ✔✔0 degrees F, 30 || || || || || || || || || || || || || || || ||
seconds, 7.2V ||
What is the largest guage wire that may be connected to a bettery with wing-nuts? -
|| || || || || || || || || || || || || || || ||
✔✔8 AWG ||
Per ABYC E-10, a battery switch must be installed in the positive conductor from each
|| || || || || || || || || || || || || || ||
battery bank with a CCA rating greater than ____ (or greater than _____ Ah if CCA
|| || || || || || || || || || || || || || || ||
rating not available). - ✔✔800 CCA or 100 Ahr (exceptions: electronic equipment with
|| || || || || || || || || || || ||
battery backed memories; safety equipment such as bilge pumps, alarms, CO
|| || || || || || || || || || || ||
detectors, bilge blowers; battery chargers; I'm pressed current systems.
|| || || || || || || ||
What is the minimum ampere interrupting capacity (AIC) for main overcurrent
|| || || || || || || || || || ||
protection on a battery bank rated at 12 V, 1500 CCA? - ✔✔AIC = 5000 Amps (E-11
|| || || || || || || || || || || || || || || || ||
table IV-A) ||
What is the minimum ampere interrupting capacity (AIC) for main overcurrent
|| || || || || || || || || || ||
protection on a battery bank rated at more than 2200 CCA or more than 500 Ahr? -
|| || || || || || || || || || || || || || || || ||
✔✔AIC = 2X mnfg's short-circuit rating or 100X nominal Ahr rating.
|| || || || || || || || || ||
T or F: it is ok to mount a battery switch inside an engine room, because ABYC startes
|| || || || || || || || || || || || || || || || ||
that it must be located as close to the batteries as practical. - ✔✔False. "Readily
|| || || || || || || || || || || || || || || ||
accessible" defines entry into the engine room in an emergency as dangerous - use a
|| || || || || || || || || || || || || || ||
remote battery switch. || ||
Explain the "7-40-72" rule - ✔✔Overcurrent protection must be located withing 7
|| || || || || || || || || || || ||
inches of the power source unless contained within a sheath, in which case it may be
|| || || || || || || || || || || || || || || ||
up to 40 inches away. If the power source is a battery and the conductors are
|| || || || || || || || || || || || || || || ||
sheathed, OC may be up to 72 inches away. || || || || || || || ||
|| || || || || || || ||
verified detailed answers || ||
How often (in inches) shall wire bundles be supported? - ✔✔Every 18 inches.
|| || || || || || || || || || || ||
What type of clamps are to be used for supporting wire bundles when routed over
|| || || || || || || || || || || || || || ||
engines and machinery? - ✔✔Insulated Metallic Hanger Clamps
|| || || || || || ||
What tensile force must a 10 Gauge crimp connector withstand for one minute? -
|| || || || || || || || || || || || || ||
✔✔40 lbs (E-11 Table XV) || || || ||
What is the max allowed unsupported cable length for battery cables? - ✔✔36 inches
|| || || || || || || || || || || || ||
T or F: Running AC and DC conductors together is allowed so long as the AC
|| || || || || || || || || || || || || || || ||
conductors are sheathed. - ✔✔True || || || ||
The most common electrical circuit problem in marine applications is:
|| || || || || || || || ||
A. Short circuits
|| ||
B. Too much continuity
|| || ||
C. Unwanted open
|| ||
D. Inter circuit Short - ✔✔C. Unwanted open
|| || || || || || ||
The primary by-product of excessive electrical resistance is:
|| || || || || || ||
A. Increased Amperage
|| ||
B. Increased Voltage
|| ||
C. Reduced Ambient Temperature
|| || ||
,D. Heat - ✔✔D. Heat
|| || || ||
One HP = how many watts? - ✔✔1 HP = 746 Watts
|| || || || || || || || || || ||
What is the preferred tool for tracing shorted and open circuits?
|| || || || || || || || || ||
A. Ohm meter
|| ||
B. Amp clamp
|| ||
C. Volt meter
|| ||
D. TDR (time-domain reflectometer) - ✔✔D. TDR (time-domain reflectometer)
|| || || || || || || ||
A technician is installing a cable run from the batteries to the main DC panel board on
|| || || || || || || || || || || || || || || ||
a boat as part of a refit. The boat has a 12-volt system and the distance form the panel
|| || || || || || || || || || || || || || || || || || ||
to the batteries is 15 ft. The maximum current draw from the panel is calculated at 90
|| || || || || || || || || || || || || || || || ||
amps. What guage cable should be used (minimum)? - ✔✔0 AWG
|| || || || || || || || || || ||
DC grounded conductors on new boats that are also equipped with AC systems should
|| || || || || || || || || || || || || ||
use what color insulated wire? - ✔✔Yellow
|| || || || || ||
What is the smallest guage wire allowed for unsheathed wire runs through the boat? -
|| || || || || || || || || || || || || || ||
✔✔16 AWG ||
T or F: Compared to deep cycle (house) batteries, cranking batteries will have thicker
|| || || || || || || || || || || || || ||
lead plates to facilitate the higher, short-duration current draws. - ✔✔False. Start
|| || || || || || || || || || || ||
batteries have a greater number of thinner plates within each cell.
|| || || || || || || || || ||
Which type of battery generally recharges faster? Deep cycle or cranking? -
|| || || || || || || || || || || ||
✔✔Cranking
,What tool and common household staple are used to clean battery terminals? -
|| || || || || || || || || || || || ||
✔✔Wire brush and backing soda. || || || ||
Why might a fully-discharged wet-cell type battery freeze? - ✔✔Most of the sulfuric
|| || || || || || || || || || || || ||
acid has been absorbed into the lead plates, leaving mostly water in the electrolyte.
|| || || || || || || || || || || || ||
Batteries must be secured to prevent movement of more than ______ inches in any
|| || || || || || || || || || || || || ||
direction when a pulling force of _____ or _____, whichever is less, is applied
|| || || || || || || || || || || || || ||
through the center of gravity of the battery for how long? - ✔✔1 inch, 90 lbs or 2x the
|| || || || || || || || || || || || || || || || || || ||
battery weight, for 1 minute in each direction.
|| || || || || || ||
T or F: it is ok to install batteries directly below an uninterrupted fuel line? - ✔✔True
|| || || || || || || || || || || || || || || ||
What provision must be in place on any fuel line located within 12 inches of a battery
|| || || || || || || || || || || || || || || || ||
terminals? - ✔✔Must be protected with dielectric insulating material
|| || || || || || || ||
Define: Battery reserve capacity = the number of minutes that a new, fully charged
|| || || || || || || || || || || || || ||
battery at ______ degrees F can be continuously discharged at ______ amps while
|| || || || || || || || || || || || ||
maintaining _____ volts (for a 12 v battery) - ✔✔80 F, 25 Amps, 10.5 Volts
|| || || || || || || || || || || || || ||
According to ABYC, what is the minimum battery reserve capacity? - ✔✔90 minutes
|| || || || || || || || || || || ||
Define: Marine Cranking Amps = the discharge load, in amperes, that a new, fully-
|| || || || || || || || || || || || ||
charged battery at _____ degrees F can deliver for ______ seconds while
|| || || || || || || || || || || ||
maintaining a voltage of _____ volts (for a 12 v battery). - ✔✔32 degrees F, 30
|| || || || || || || || || || || || || || || ||
seconds, 7.2V ||
Define: Cold Cranking Amps = the discharge load, in amperes, that a new, fully-
|| || || || || || || || || || || || ||
charged battery at _____ degrees F can deliver for ______ seconds while
|| || || || || || || || || || || ||
, maintaining a voltage of _____ volts (for a 12 v battery). - ✔✔0 degrees F, 30 || || || || || || || || || || || || || || || ||
seconds, 7.2V ||
What is the largest guage wire that may be connected to a bettery with wing-nuts? -
|| || || || || || || || || || || || || || || ||
✔✔8 AWG ||
Per ABYC E-10, a battery switch must be installed in the positive conductor from each
|| || || || || || || || || || || || || || ||
battery bank with a CCA rating greater than ____ (or greater than _____ Ah if CCA
|| || || || || || || || || || || || || || || ||
rating not available). - ✔✔800 CCA or 100 Ahr (exceptions: electronic equipment with
|| || || || || || || || || || || ||
battery backed memories; safety equipment such as bilge pumps, alarms, CO
|| || || || || || || || || || || ||
detectors, bilge blowers; battery chargers; I'm pressed current systems.
|| || || || || || || ||
What is the minimum ampere interrupting capacity (AIC) for main overcurrent
|| || || || || || || || || || ||
protection on a battery bank rated at 12 V, 1500 CCA? - ✔✔AIC = 5000 Amps (E-11
|| || || || || || || || || || || || || || || || ||
table IV-A) ||
What is the minimum ampere interrupting capacity (AIC) for main overcurrent
|| || || || || || || || || || ||
protection on a battery bank rated at more than 2200 CCA or more than 500 Ahr? -
|| || || || || || || || || || || || || || || || ||
✔✔AIC = 2X mnfg's short-circuit rating or 100X nominal Ahr rating.
|| || || || || || || || || ||
T or F: it is ok to mount a battery switch inside an engine room, because ABYC startes
|| || || || || || || || || || || || || || || || ||
that it must be located as close to the batteries as practical. - ✔✔False. "Readily
|| || || || || || || || || || || || || || || ||
accessible" defines entry into the engine room in an emergency as dangerous - use a
|| || || || || || || || || || || || || || ||
remote battery switch. || ||
Explain the "7-40-72" rule - ✔✔Overcurrent protection must be located withing 7
|| || || || || || || || || || || ||
inches of the power source unless contained within a sheath, in which case it may be
|| || || || || || || || || || || || || || || ||
up to 40 inches away. If the power source is a battery and the conductors are
|| || || || || || || || || || || || || || || ||
sheathed, OC may be up to 72 inches away. || || || || || || || ||
