ABYC MARINE ELECTRICAL (ACTUAL 2025/2026)
CERTIFICATION 270 QUESTIONS WITH 100% DETAILED
VERIFIED ANSWERS A+ GRADE
A 2000 watt inverter is operating inverting at 100% effeciency.
With 12.6 volts, how many amps is the inverter drawing from
the battery bank?
a. 120 amps
b. 123 amps
c. 137 amps
d. 158 amps - <<,Answers>>>d. 158 amps
1f an inverter also serves as a battery charger it shall also
meet the requirements of:
a. ABYC A-20 Battery Charging Devices
b. ABYC E-6 Refrigeration Equipment installation
c. A-16 Electric Navigational lighting
d. All of the above - <<,Answers>>>a. ABYC A-20 Battery
Charging Devices
Which of the following is not a correct installation practice for
an inverter installation?
a. a ventilated dry, accessible location
b. where ambient temperature does not exceed 30 degrees C
c. away from heat sources such as dry exhaust
,d. directly over batteries - <<,Answers>>>d. directly over
batteries
Which is the primary function on an inverter?
a. Convert AC to DC
b. Convert DC to AC
c. Act as a fixed voltage DC power supply
d. None of the above - <<,Answers>>>b. Convert DC to AC
Which is the primary function of a converter?
a. Convert AC to DC
b. Convert DC to AC
c. Convert DC to DC
d. Act as a fixed voltage DC power supply
e. Answer C & D are correct - <<,Answers>>>e. Answer C & D
are correct
When a customer complains of low inverter AC output voltage,
the first thing the technician should do is:
a. test with an RMS voltmeter
b. replace the inverter
c. test with a calibrated averaging voltmeter
d. readjust the customer's voltmeter - <<,Answers>>>a. test
with an RMS voltmeter
,Technician A says inverter AC backfeeding is caused by
improper switching of an external power source. Technician B
says that backfeeding is caused by DC reversed polarity. Which
technician is correct?
a. Technician A
b. Technician B
c. Neither A nor B
d. Both A and B - <<,Answers>>>c. Neither A nor B
Which is not a correct mode of operation of an inverter?
a. inverting mode
b. transfer mode
c. charging mode
d. blocking mode - <<,Answers>>>d. blocking mode
When an inverter is producing AC power, the inverter output
neutral conductor should be
a. connected to the boats AC ground
b. floating above ground
c. greater than 25,000 ohms below ground
d. greater than 25,000 ohms above ground - <<,Answers>>>a.
connected to the boats AC ground
A sine wave for "Shore Power" AC has an RMS value of 120
volts. What is its peak value?
a. 120 Volts
, b. 169 Volts
c. 208 Volts
d. 240 Volts - <<,Answers>>>b. 169 Volts
For proper inverter operation it is important to do all of the
following except
a. adequately size inverter output for connected loads
b. provide AC overcurrent circuit protection
c. provide DC overcurrent circuit protection
d. use large cranking batteries - <<,Answers>>>d. use large
cranking batteries
The inverter DC grounding conductor may be one size smaller
than than the minimum size conductor required for the DC
current carrying conductors providing the overcurrent
protection device in the DC positive conductor is rated no
greater than __________ of the ampacity of the DC grounding
conductor and the conductor is no smaller than 16 AWG.
A. 100%
B. 120%
C. 125%
D. 135% - <<,Answers>>>D. 135% (see A-31.6.5.1.2, exception)
A 2000 watt inverter is operating at 50% capacity with a 90%
effeciency rating. With a battery voltage of 12.6 volts how many
amps is the inverter drawing from the battery bank?
a. 89 amps
CERTIFICATION 270 QUESTIONS WITH 100% DETAILED
VERIFIED ANSWERS A+ GRADE
A 2000 watt inverter is operating inverting at 100% effeciency.
With 12.6 volts, how many amps is the inverter drawing from
the battery bank?
a. 120 amps
b. 123 amps
c. 137 amps
d. 158 amps - <<,Answers>>>d. 158 amps
1f an inverter also serves as a battery charger it shall also
meet the requirements of:
a. ABYC A-20 Battery Charging Devices
b. ABYC E-6 Refrigeration Equipment installation
c. A-16 Electric Navigational lighting
d. All of the above - <<,Answers>>>a. ABYC A-20 Battery
Charging Devices
Which of the following is not a correct installation practice for
an inverter installation?
a. a ventilated dry, accessible location
b. where ambient temperature does not exceed 30 degrees C
c. away from heat sources such as dry exhaust
,d. directly over batteries - <<,Answers>>>d. directly over
batteries
Which is the primary function on an inverter?
a. Convert AC to DC
b. Convert DC to AC
c. Act as a fixed voltage DC power supply
d. None of the above - <<,Answers>>>b. Convert DC to AC
Which is the primary function of a converter?
a. Convert AC to DC
b. Convert DC to AC
c. Convert DC to DC
d. Act as a fixed voltage DC power supply
e. Answer C & D are correct - <<,Answers>>>e. Answer C & D
are correct
When a customer complains of low inverter AC output voltage,
the first thing the technician should do is:
a. test with an RMS voltmeter
b. replace the inverter
c. test with a calibrated averaging voltmeter
d. readjust the customer's voltmeter - <<,Answers>>>a. test
with an RMS voltmeter
,Technician A says inverter AC backfeeding is caused by
improper switching of an external power source. Technician B
says that backfeeding is caused by DC reversed polarity. Which
technician is correct?
a. Technician A
b. Technician B
c. Neither A nor B
d. Both A and B - <<,Answers>>>c. Neither A nor B
Which is not a correct mode of operation of an inverter?
a. inverting mode
b. transfer mode
c. charging mode
d. blocking mode - <<,Answers>>>d. blocking mode
When an inverter is producing AC power, the inverter output
neutral conductor should be
a. connected to the boats AC ground
b. floating above ground
c. greater than 25,000 ohms below ground
d. greater than 25,000 ohms above ground - <<,Answers>>>a.
connected to the boats AC ground
A sine wave for "Shore Power" AC has an RMS value of 120
volts. What is its peak value?
a. 120 Volts
, b. 169 Volts
c. 208 Volts
d. 240 Volts - <<,Answers>>>b. 169 Volts
For proper inverter operation it is important to do all of the
following except
a. adequately size inverter output for connected loads
b. provide AC overcurrent circuit protection
c. provide DC overcurrent circuit protection
d. use large cranking batteries - <<,Answers>>>d. use large
cranking batteries
The inverter DC grounding conductor may be one size smaller
than than the minimum size conductor required for the DC
current carrying conductors providing the overcurrent
protection device in the DC positive conductor is rated no
greater than __________ of the ampacity of the DC grounding
conductor and the conductor is no smaller than 16 AWG.
A. 100%
B. 120%
C. 125%
D. 135% - <<,Answers>>>D. 135% (see A-31.6.5.1.2, exception)
A 2000 watt inverter is operating at 50% capacity with a 90%
effeciency rating. With a battery voltage of 12.6 volts how many
amps is the inverter drawing from the battery bank?
a. 89 amps
