ABYC Corrosion questions with verified answers
__________ are electrical conductors in which current is carried by ions rather
than by free electrons. Ans✓✓✓-Electrolytes
____________ is the destructive alteration of metal by reachtion with its
environment. Ans✓✓✓-Corrosion
A galvanic isolator allows AC current to pass through?
a. True
b. False
c. Cannot be determined, need more information Ans✓✓✓-A. True
A manganese bronze propeller has a soft, porous and red surface. Which of the
following is not the cause of dezincification?
a. Cathodic overprotection
b. Simple electrochemical corrosion
c. Galvanic corrosion
d. Stray current attack Ans✓✓✓-A. Cathodic overprotection
A molecule is two or more combined atoms of
a. Different atoms
b. The same atom
c. Both of these are correct
d. Neither of these are correct Ans✓✓✓-C. Both
,A reference potential reading in excess of -1100 mV indicates what? Ans✓✓✓-
Excessive cathodic protection.
A reverse polarity indicator is placed between which two wires? Why? Ans✓✓✓-
White neutral and green grounding.
If the black hot and white neutral are reversed, electricity will flow through the
white neutral illuminating the indicator light and leaving through the green
grounding conductor.
ABYC E2, the potential range, for full protection, of a fiberglass boat is:
a. -500mV to -900mV
b. -550mV to -1100mV
c. -800mV to -1100mV
d. -950MV to -1100mV Ans✓✓✓-B. -550mV to -1100mV
An atom becomes positive ion when it loses a valance electron
a. True
b. False
c. Cannot be determined, need more information Ans✓✓✓-A. True
An atom will become a positive ion when:
a. Gains electrons
b. Loses electrons
c. When it has a covalent bond
d. When it forms a solution Ans✓✓✓-B. Loses electrons
, An isolation transformer works through electromagnetic _________. Ans✓✓✓-
Induction
Atoms are made of Ans✓✓✓-protons, neutrons, electrons
Atoms become more stable by sharing electrons. This is called ______ bonding.
a. Polar
b. Covalent
c. Ionic
d. Electrostatics Ans✓✓✓-B. Covelant
Atoms that have gained or lost an electron are known as Ans✓✓✓-Ions
Bonding systems should utilize a _____ green wire to ensure all underwater
fittings are a the same potential. The vessel does not have a lightning protection
system.
a. #6
b. #8
c. #10
d. #12 Ans✓✓✓-B. #8 AWG green
Bonding wires shall be at least #__ AWG Ans✓✓✓-#8 AWG
Cathode protection systems shall be capable of inducing and mainting a minimum
negative shift of Ans✓✓✓-200mV
__________ are electrical conductors in which current is carried by ions rather
than by free electrons. Ans✓✓✓-Electrolytes
____________ is the destructive alteration of metal by reachtion with its
environment. Ans✓✓✓-Corrosion
A galvanic isolator allows AC current to pass through?
a. True
b. False
c. Cannot be determined, need more information Ans✓✓✓-A. True
A manganese bronze propeller has a soft, porous and red surface. Which of the
following is not the cause of dezincification?
a. Cathodic overprotection
b. Simple electrochemical corrosion
c. Galvanic corrosion
d. Stray current attack Ans✓✓✓-A. Cathodic overprotection
A molecule is two or more combined atoms of
a. Different atoms
b. The same atom
c. Both of these are correct
d. Neither of these are correct Ans✓✓✓-C. Both
,A reference potential reading in excess of -1100 mV indicates what? Ans✓✓✓-
Excessive cathodic protection.
A reverse polarity indicator is placed between which two wires? Why? Ans✓✓✓-
White neutral and green grounding.
If the black hot and white neutral are reversed, electricity will flow through the
white neutral illuminating the indicator light and leaving through the green
grounding conductor.
ABYC E2, the potential range, for full protection, of a fiberglass boat is:
a. -500mV to -900mV
b. -550mV to -1100mV
c. -800mV to -1100mV
d. -950MV to -1100mV Ans✓✓✓-B. -550mV to -1100mV
An atom becomes positive ion when it loses a valance electron
a. True
b. False
c. Cannot be determined, need more information Ans✓✓✓-A. True
An atom will become a positive ion when:
a. Gains electrons
b. Loses electrons
c. When it has a covalent bond
d. When it forms a solution Ans✓✓✓-B. Loses electrons
, An isolation transformer works through electromagnetic _________. Ans✓✓✓-
Induction
Atoms are made of Ans✓✓✓-protons, neutrons, electrons
Atoms become more stable by sharing electrons. This is called ______ bonding.
a. Polar
b. Covalent
c. Ionic
d. Electrostatics Ans✓✓✓-B. Covelant
Atoms that have gained or lost an electron are known as Ans✓✓✓-Ions
Bonding systems should utilize a _____ green wire to ensure all underwater
fittings are a the same potential. The vessel does not have a lightning protection
system.
a. #6
b. #8
c. #10
d. #12 Ans✓✓✓-B. #8 AWG green
Bonding wires shall be at least #__ AWG Ans✓✓✓-#8 AWG
Cathode protection systems shall be capable of inducing and mainting a minimum
negative shift of Ans✓✓✓-200mV
