ABYC Marine Electrical Certification
Day 2 Test Questions and Answers
A _______ is what changes the AC power from the alternator to usable DC power. -
Answer-rectifier (bridge rectifier)
An AC leakage of up to _______ past the diodes of an alternators rectifier is considered
normal. - Answer-0.4 V
The following are part of an Alternator except __________
Stator
Rotor
AIC
Voltage regulator
Rectifier - Answer-AIC
When mounting an alternator, proper consideration should be made for - Answer-•Wire
Guage
•Alternator RPM
•Alternator voltage sensing & Cable connection
•Proper belt tension/pulley alignment
On a battery charger/inverter output the DC case ground should be no more than
______ Guage size less than DC current carrying conductor - Answer-1
Class T fuses are considered what? - Answer-Slow Blow
When testing a battery charger a rise of _______ under load, from your battery baseline
indicates charger is operable. - Answer-0.5 V
When selecting a location to install a battery chargers/inverter consideration should be
made for what? - Answer-■Bilge levels, water, splash
■Adequate ventilation
■Ignition Protection (where required)
■Never install over batteries
Metal cased chargers/inverters must have a ________ ground at the case. - Answer-AC
and DC
Typical charging range of a battery is? - Answer-12.6 to 14.1
Battery charging systems should sense __________. - Answer-at battery.
, Solar panel systems need ______ to prevent back feeding. - Answer-blocking diodes
Due variable outputs of up to 20V, solar panels require what? - Answer-Voltage
regulator
Battery banks should be discharged at no more than ____% - Answer-50%
The efficiency loss through inverters is typically between ____ & ______ - Answer-5%
and 15%
Appropriate GFCI for inverters is determined by what? - Answer-The manufacturer
The ratio for converting AC to DC is? - Answer-11 to 1 (11:1)
Inverters should be chosen carefully with primary concern for what? - Answer-Output
capacity
On the AC output side of an investor is is important to provide isolated what? - Answer-
Hot and neutral bus bars
Since inverters do not provide a true sine wave best device to "see" is a DVOM with....?
- Answer-true RMS (root mean square)
What is the preferred tool to test sine waveform? - Answer-oscilloscope
Reverse polarity indicator has a _____ ohm resistor. - Answer-25k resistor at 120v/60hz
True or False?
Harmonic distortion can cause GFCI to not work properly. - Answer-True
New galvanic isolators should be _______ to avoid monitoring - Answer-Fail safe or self
monitoring
What is the max voltage to charge most gell cell batteries? - Answer-14.1 volts
Range of specific gravity in fully charged 12v battery? - Answer-1.260 to 1.285
Fully Charged battery is _____ volts. - Answer-12.6
Batteries create ______ gas. - Answer-Hydrogen
Two twelve volt batteries in parallel will create ________ volts - Answer-12.6 (amperage
doubles)
Two 12V batteries in series creates _______ volts, but amperage remains the same -
Answer-24V
Day 2 Test Questions and Answers
A _______ is what changes the AC power from the alternator to usable DC power. -
Answer-rectifier (bridge rectifier)
An AC leakage of up to _______ past the diodes of an alternators rectifier is considered
normal. - Answer-0.4 V
The following are part of an Alternator except __________
Stator
Rotor
AIC
Voltage regulator
Rectifier - Answer-AIC
When mounting an alternator, proper consideration should be made for - Answer-•Wire
Guage
•Alternator RPM
•Alternator voltage sensing & Cable connection
•Proper belt tension/pulley alignment
On a battery charger/inverter output the DC case ground should be no more than
______ Guage size less than DC current carrying conductor - Answer-1
Class T fuses are considered what? - Answer-Slow Blow
When testing a battery charger a rise of _______ under load, from your battery baseline
indicates charger is operable. - Answer-0.5 V
When selecting a location to install a battery chargers/inverter consideration should be
made for what? - Answer-■Bilge levels, water, splash
■Adequate ventilation
■Ignition Protection (where required)
■Never install over batteries
Metal cased chargers/inverters must have a ________ ground at the case. - Answer-AC
and DC
Typical charging range of a battery is? - Answer-12.6 to 14.1
Battery charging systems should sense __________. - Answer-at battery.
, Solar panel systems need ______ to prevent back feeding. - Answer-blocking diodes
Due variable outputs of up to 20V, solar panels require what? - Answer-Voltage
regulator
Battery banks should be discharged at no more than ____% - Answer-50%
The efficiency loss through inverters is typically between ____ & ______ - Answer-5%
and 15%
Appropriate GFCI for inverters is determined by what? - Answer-The manufacturer
The ratio for converting AC to DC is? - Answer-11 to 1 (11:1)
Inverters should be chosen carefully with primary concern for what? - Answer-Output
capacity
On the AC output side of an investor is is important to provide isolated what? - Answer-
Hot and neutral bus bars
Since inverters do not provide a true sine wave best device to "see" is a DVOM with....?
- Answer-true RMS (root mean square)
What is the preferred tool to test sine waveform? - Answer-oscilloscope
Reverse polarity indicator has a _____ ohm resistor. - Answer-25k resistor at 120v/60hz
True or False?
Harmonic distortion can cause GFCI to not work properly. - Answer-True
New galvanic isolators should be _______ to avoid monitoring - Answer-Fail safe or self
monitoring
What is the max voltage to charge most gell cell batteries? - Answer-14.1 volts
Range of specific gravity in fully charged 12v battery? - Answer-1.260 to 1.285
Fully Charged battery is _____ volts. - Answer-12.6
Batteries create ______ gas. - Answer-Hydrogen
Two twelve volt batteries in parallel will create ________ volts - Answer-12.6 (amperage
doubles)
Two 12V batteries in series creates _______ volts, but amperage remains the same -
Answer-24V
