ABYC Electrical Exam Graded A+
A customer complains about a reverse polarity problem. All of the following are likely
causes of the problem except:
A. Improperly wired shore power cord
B. improperly wired shore power inlet receptacle
C. an open neutral
D. reversal of the hot and neutral conductors in the AC panel feeder cable - ANSWER-
C. an open neutral
A customer complains that certain electronic components (fed from a panel board)
malfunction during engine cranking. Probable causes are all of the following except:
A. Undersized conductor feeding the panelboard
B. Faulty battery switch
C. Undersized cranking battery
D. Undersized DC grounding conductor - ANSWER-B. Faulty battery switch
A customer complains that his generator will start from the local control panel at the
generator, but not from the remote control panel at the helm location. of the choices
given, the most probable cause for this would be:
A. Bad generator starter solenoid
B. low voltage atet starter battery
C. excessive voltage drop across the remote starter switch
D. loose battery cable clamp at the starter battery - ANSWER-C. excessive voltage drop
across the remote starter switch
A dropped neutral conductor in a 240/120 V shore power system will most likely show
up as:
A. nuisance tripping of the AC main breaker
B. nuisance tripping of an appliance branch circuit breaker
C. A loud humming noise emitting from an on board television.
D. burned out 120 V appliances - ANSWER-D. burned out 120 V appliances
A proper test to verify the integrity of the shore power ground to the boats AC grounding
bus (no galvanic isolator) is:
A. Measure resistance between the shore power grounding conductor and AC
grounding bus
B. Plug in shore power cord and measure voltage between hot and neutral
C. Connect hot conductor to shore power ground
D. Check reverse polarity indicator - ANSWER-A. Measure resistance between shore
power grounding conductor and AC grounding bus.
A reverse polarity indicator should be connected between:
A. Neutral and ground
B. AC Ground and DC negative
, C. Hot and ground
D. Hot and neutral - ANSWER-A. Neutral and Ground
A Tech is installing a the cable run from batteries to the main DC panel board. The
boat's nominal voltage is 12 DC. The distance from the batteries tot eh panel is 15'. THe
max amp draw is 90 amps. According to ABYC what is the minimum wire gauge
allowed?
A. 0 AWG
B. 2 AWG
C. 4 AWG
D. 6 AWG - ANSWER-A. 0 AWG
A technican is installing the 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 from the panel
to the batteries is 15 ft. the max current draw from he panel is calculated at 90 amps.
What gauge cable should be used at minimum to maintain compliance?
A. 0 AWG
B. 2 AWG
C. 4 AWG
D. 6 AWG - ANSWER-A. 0 AWG
A true RMS volt meter is required to accurately check output voltage from a/an:
A. Non-sinusoidal inverter
B. isolation transformer
C. inverter DC input
D. galvanic isolator - ANSWER-A. non-sinusoidal inverter
A voltage regulator controls which of the following?
A. Alternator rotor internal resistance
B. Alternator AC ripple voltage
C. A battery's self discharge rate
D. Alternator field voltage - ANSWER-D. Alternator field voltage
ABYC Standard _________ applies to inverters.
A. E-2
B. A-27
C. A-28
D. A-31 - ANSWER-D. A-31
AC receptacles may be used for DC service based on ABYC as long as they are:
A. rated for proper current
B. labeled appropriately for the supplied service
C. rated for proper voltage requirements
D. never be used for DC service - ANSWER-D. never be used for DC service
A customer complains about a reverse polarity problem. All of the following are likely
causes of the problem except:
A. Improperly wired shore power cord
B. improperly wired shore power inlet receptacle
C. an open neutral
D. reversal of the hot and neutral conductors in the AC panel feeder cable - ANSWER-
C. an open neutral
A customer complains that certain electronic components (fed from a panel board)
malfunction during engine cranking. Probable causes are all of the following except:
A. Undersized conductor feeding the panelboard
B. Faulty battery switch
C. Undersized cranking battery
D. Undersized DC grounding conductor - ANSWER-B. Faulty battery switch
A customer complains that his generator will start from the local control panel at the
generator, but not from the remote control panel at the helm location. of the choices
given, the most probable cause for this would be:
A. Bad generator starter solenoid
B. low voltage atet starter battery
C. excessive voltage drop across the remote starter switch
D. loose battery cable clamp at the starter battery - ANSWER-C. excessive voltage drop
across the remote starter switch
A dropped neutral conductor in a 240/120 V shore power system will most likely show
up as:
A. nuisance tripping of the AC main breaker
B. nuisance tripping of an appliance branch circuit breaker
C. A loud humming noise emitting from an on board television.
D. burned out 120 V appliances - ANSWER-D. burned out 120 V appliances
A proper test to verify the integrity of the shore power ground to the boats AC grounding
bus (no galvanic isolator) is:
A. Measure resistance between the shore power grounding conductor and AC
grounding bus
B. Plug in shore power cord and measure voltage between hot and neutral
C. Connect hot conductor to shore power ground
D. Check reverse polarity indicator - ANSWER-A. Measure resistance between shore
power grounding conductor and AC grounding bus.
A reverse polarity indicator should be connected between:
A. Neutral and ground
B. AC Ground and DC negative
, C. Hot and ground
D. Hot and neutral - ANSWER-A. Neutral and Ground
A Tech is installing a the cable run from batteries to the main DC panel board. The
boat's nominal voltage is 12 DC. The distance from the batteries tot eh panel is 15'. THe
max amp draw is 90 amps. According to ABYC what is the minimum wire gauge
allowed?
A. 0 AWG
B. 2 AWG
C. 4 AWG
D. 6 AWG - ANSWER-A. 0 AWG
A technican is installing the 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 from the panel
to the batteries is 15 ft. the max current draw from he panel is calculated at 90 amps.
What gauge cable should be used at minimum to maintain compliance?
A. 0 AWG
B. 2 AWG
C. 4 AWG
D. 6 AWG - ANSWER-A. 0 AWG
A true RMS volt meter is required to accurately check output voltage from a/an:
A. Non-sinusoidal inverter
B. isolation transformer
C. inverter DC input
D. galvanic isolator - ANSWER-A. non-sinusoidal inverter
A voltage regulator controls which of the following?
A. Alternator rotor internal resistance
B. Alternator AC ripple voltage
C. A battery's self discharge rate
D. Alternator field voltage - ANSWER-D. Alternator field voltage
ABYC Standard _________ applies to inverters.
A. E-2
B. A-27
C. A-28
D. A-31 - ANSWER-D. A-31
AC receptacles may be used for DC service based on ABYC as long as they are:
A. rated for proper current
B. labeled appropriately for the supplied service
C. rated for proper voltage requirements
D. never be used for DC service - ANSWER-D. never be used for DC service
