ABYC Marine Electrical - Set Two questions with verified
answers
___ are used to confirm the integrity of the winding insulation inside a generator
or motor, and can also be used to check everyday appliances for ground leaks to
the case of the equipment.
A. Hydrometers
B. Megohmmeters
C. Multimeters
D. Clamp-on ammeters Ans✓✓✓-B. Megohmmeters
___ of the AC output waveform from some inverters may affect the operation of
some GFCI devices.
A. Harmonic distortion
B. Electromagnetic induction
C. Voltage drop
D. Electronic noise Ans✓✓✓-A. Harmonic distortion
___ shall be provided for switching devices in installations that are not capable of
seamless transfer or parallel operations and to prevent a single bus from being
energized by more than one non-synchronized AC power source simultaneously.
A. Backfeed protection
B. Electrical interlocking
C. Shore-power paralleling
D. Remote monitoring Ans✓✓✓-B. Electrical interlocking
,3. Standard 11.9.3.2 states that a system ___ shall be installed on the main
panelboard if the system is permanently connected to an electric motor, a
generator, or an inverter.
A. backfeed protection device
B. ohmmeter
C. remote monitoring panel
D. voltmeter Ans✓✓✓-D. voltmeter
A ___ is the only device permitted to be installed in series with the AC grounding
conductor. Ans✓✓✓-Galvanic Isolator
A "dropped neutral" conductor in a 240/120V shore power system will most likely
show up as:
A. Nuisance tripping of main AC breaker
B. Nuisance tripping of an appliance branch of circuit breaker
C. A loud humming noise emitting from an onboard television
D. Burned out 120V appliance Ans✓✓✓-D. Burned out 120V appliance
A battery switch shall be installed in the ___ conductor(s) from each battery or
battery bank with a CCA rating greater than 800 amperes or 100 Ah if CCA is
unavailable.
A. neutral
B. positive
C. negative
D. grounded
E. Band Ans✓✓✓-B. positive
, 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
Ans✓✓✓-C. An Open Neutral
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
given choices, which is the most probable cause?
A. Bad generator start solenoid
B. Low voltage at the starter battery
C. Excessive voltage drop across the remote starter switch
D. Loose battery cable clamp at the starter battery Ans✓✓✓-C. Excessive voltage
drop across the remote starter switch
A dropped neutral can cause AC equipment onboard to fail, depending upon how
well-balanced the two "legs" of the system are and what is turned on when the
___ conductor becomes disconnected.
A. ungrounded
B. DC negative return
C. grounding
D. neutral Ans✓✓✓-D. neutral
answers
___ are used to confirm the integrity of the winding insulation inside a generator
or motor, and can also be used to check everyday appliances for ground leaks to
the case of the equipment.
A. Hydrometers
B. Megohmmeters
C. Multimeters
D. Clamp-on ammeters Ans✓✓✓-B. Megohmmeters
___ of the AC output waveform from some inverters may affect the operation of
some GFCI devices.
A. Harmonic distortion
B. Electromagnetic induction
C. Voltage drop
D. Electronic noise Ans✓✓✓-A. Harmonic distortion
___ shall be provided for switching devices in installations that are not capable of
seamless transfer or parallel operations and to prevent a single bus from being
energized by more than one non-synchronized AC power source simultaneously.
A. Backfeed protection
B. Electrical interlocking
C. Shore-power paralleling
D. Remote monitoring Ans✓✓✓-B. Electrical interlocking
,3. Standard 11.9.3.2 states that a system ___ shall be installed on the main
panelboard if the system is permanently connected to an electric motor, a
generator, or an inverter.
A. backfeed protection device
B. ohmmeter
C. remote monitoring panel
D. voltmeter Ans✓✓✓-D. voltmeter
A ___ is the only device permitted to be installed in series with the AC grounding
conductor. Ans✓✓✓-Galvanic Isolator
A "dropped neutral" conductor in a 240/120V shore power system will most likely
show up as:
A. Nuisance tripping of main AC breaker
B. Nuisance tripping of an appliance branch of circuit breaker
C. A loud humming noise emitting from an onboard television
D. Burned out 120V appliance Ans✓✓✓-D. Burned out 120V appliance
A battery switch shall be installed in the ___ conductor(s) from each battery or
battery bank with a CCA rating greater than 800 amperes or 100 Ah if CCA is
unavailable.
A. neutral
B. positive
C. negative
D. grounded
E. Band Ans✓✓✓-B. positive
, 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
Ans✓✓✓-C. An Open Neutral
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
given choices, which is the most probable cause?
A. Bad generator start solenoid
B. Low voltage at the starter battery
C. Excessive voltage drop across the remote starter switch
D. Loose battery cable clamp at the starter battery Ans✓✓✓-C. Excessive voltage
drop across the remote starter switch
A dropped neutral can cause AC equipment onboard to fail, depending upon how
well-balanced the two "legs" of the system are and what is turned on when the
___ conductor becomes disconnected.
A. ungrounded
B. DC negative return
C. grounding
D. neutral Ans✓✓✓-D. neutral
