ABYC ELECTRICAL STUDY questions and
answers with solutions
the reverse polarity indicator is an LED with 2 legs. One of these legs have a resistor of -
ANSWER 25k Ohms
Anodes used in cathodic protection systems shall be - ANSWER painted with a protective barrier
coating
oil pressure and temperature gauges are - ANSWER installed in series
what type of element are in series - ANSWER the switches
voltage regulator ( inbetween output and breaker) - ANSWER controls alternator field voltage
isolator transformer - ANSWER cleans signal
how much is the increase in torque for the capacitor - ANSWER 250%
RPM modify - ANSWER from the govner
commutator - ANSWER a slip ring that serves to reverse the direction in which an electrical
current flows from the generator
armature - ANSWER the iron the coil goes on
excitation (ac alternator generators) - ANSWER on the rotor
,voltage - ANSWER difference in potiental
for sailboats the top of the lighting rod should be - ANSWER 6in above everything else on the
mast and filed to a sharp point
independent breaker to - ANSWER activate inverter
ohm meter reads - ANSWER amps AC only
single phase - ANSWER needs netural
ground fault - ANSWER if electricity leaks from intended paths in these 2 wires ( ac hot and
neutral)
battery isolator - ANSWER charge batteries with 1 alternator
galvanic isolator - ANSWER blocks bad DC currents
only at the source of power - ANSWER the neutral and ground should be connected
the minimum amp circuit breaker that should be used to protect a 120v water heater circuit
with a 1600-watt element would be rated at________amps. - ANSWER 15
when testing for excessive EMF emission near a conductor or appliance, the tool of choice -
ANSWER gauss meter
, the primary problem with using a series circuit to supply multiple loads is - ANSWER voltage
drop through the circuit will be excessive
based on this section, the most common electrical circuit problem in marine applications is -
ANSWER unwanted open
the primary by-product of excessive electrical resistance is - ANSWER heat
one horsepower equals - ANSWER 746 watts
excessive electrical resistance can be caused by - ANSWER undersized wires,loose connections
and corrosion
gauss meter - ANSWER helps detect sources of magnetic interference that affect electronic
compasses,autopliots and others
an intercircuit short circuit - ANSWER is one which unwanted conductors , such as an errant
screw, completes a circuit in ways it wasn't designed to be connected
time-domain reflectometer - ANSWER can pinpoint the location of short circuts and open
circuits
BASED ON ABYC STANDARDS, A 1,000 WATT 120VAC WATER HEATER, WHOSE SUPPLY CABLE
HAS 105C THERMAL RATING, IS RUN OUTSIDE OF THE ENGINE ROOM AND IS NOT BUNDLED
WITH ANY OTHER CONDUCTORS. WHAT MINIMUM SIZE WIRE GAUGE WILL BE REQUIRED TO
SERVICE THIS CIRCUIT? - ANSWER 16 gauge
WHICH OF THE FOLLOWING COMPONENTS DOES NOT REQUIRE OVERCURRENT PROTECTION? -
ANSWER STARTER MOTOR
answers with solutions
the reverse polarity indicator is an LED with 2 legs. One of these legs have a resistor of -
ANSWER 25k Ohms
Anodes used in cathodic protection systems shall be - ANSWER painted with a protective barrier
coating
oil pressure and temperature gauges are - ANSWER installed in series
what type of element are in series - ANSWER the switches
voltage regulator ( inbetween output and breaker) - ANSWER controls alternator field voltage
isolator transformer - ANSWER cleans signal
how much is the increase in torque for the capacitor - ANSWER 250%
RPM modify - ANSWER from the govner
commutator - ANSWER a slip ring that serves to reverse the direction in which an electrical
current flows from the generator
armature - ANSWER the iron the coil goes on
excitation (ac alternator generators) - ANSWER on the rotor
,voltage - ANSWER difference in potiental
for sailboats the top of the lighting rod should be - ANSWER 6in above everything else on the
mast and filed to a sharp point
independent breaker to - ANSWER activate inverter
ohm meter reads - ANSWER amps AC only
single phase - ANSWER needs netural
ground fault - ANSWER if electricity leaks from intended paths in these 2 wires ( ac hot and
neutral)
battery isolator - ANSWER charge batteries with 1 alternator
galvanic isolator - ANSWER blocks bad DC currents
only at the source of power - ANSWER the neutral and ground should be connected
the minimum amp circuit breaker that should be used to protect a 120v water heater circuit
with a 1600-watt element would be rated at________amps. - ANSWER 15
when testing for excessive EMF emission near a conductor or appliance, the tool of choice -
ANSWER gauss meter
, the primary problem with using a series circuit to supply multiple loads is - ANSWER voltage
drop through the circuit will be excessive
based on this section, the most common electrical circuit problem in marine applications is -
ANSWER unwanted open
the primary by-product of excessive electrical resistance is - ANSWER heat
one horsepower equals - ANSWER 746 watts
excessive electrical resistance can be caused by - ANSWER undersized wires,loose connections
and corrosion
gauss meter - ANSWER helps detect sources of magnetic interference that affect electronic
compasses,autopliots and others
an intercircuit short circuit - ANSWER is one which unwanted conductors , such as an errant
screw, completes a circuit in ways it wasn't designed to be connected
time-domain reflectometer - ANSWER can pinpoint the location of short circuts and open
circuits
BASED ON ABYC STANDARDS, A 1,000 WATT 120VAC WATER HEATER, WHOSE SUPPLY CABLE
HAS 105C THERMAL RATING, IS RUN OUTSIDE OF THE ENGINE ROOM AND IS NOT BUNDLED
WITH ANY OTHER CONDUCTORS. WHAT MINIMUM SIZE WIRE GAUGE WILL BE REQUIRED TO
SERVICE THIS CIRCUIT? - ANSWER 16 gauge
WHICH OF THE FOLLOWING COMPONENTS DOES NOT REQUIRE OVERCURRENT PROTECTION? -
ANSWER STARTER MOTOR
