How often (in inches) shall wire bundles be supported? -
Correct answer - Every 18 inches.
What type of clamps are to be used for supporting wire bundles
when routed over engines and machinery? - Correct answer -
Insulated Metallic Hanger Clamps
What tensile force must a 10 Gauge crimp connector withstand
for one minute? - Correct answer - 40 lbs (E-11 Table XV)
DC grounded conductors on new boats that are also equipped
with AC systems should use what color insulated wire? -
Correct answer - Yellow
,What is the smallest guage wire allowed for unsheathed wire
runs through the boat? - Correct answer - 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. - Correct answer - False. Start
batteries have a greater number of thinner plates within each
cell.
What is the max allowed unsupported cable length for battery
cables? - Correct answer - 36 inches
T or F: Running AC and DC conductors together is allowed so
long as the AC conductors are sheathed. - Correct answer -
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 - Correct answer - C. Unwanted open
The primary by-product of excessive electrical resistance is:
,A. Increased Amperage
B. Increased Voltage
C. Reduced Ambient Temperature
D. Heat - Correct answer - D. Heat
One HP = how many watts? - Correct answer - 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) - Correct answer - 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)? - Correct answer - 0 AWG
, Which type of battery generally recharges faster? Deep cycle or
cranking? - Correct answer - Cranking
What tool and common household staple are used to clean
battery terminals? - Correct answer - Wire brush and backing
soda.
Why might a fully-discharged wet-cell type battery freeze? -
Correct answer - 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? - Correct answer - 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? - Correct answer - True
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