ABYC CORROSION EXAM
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 - ANSWERS-B. #8 AWG green
The reverse polarity light connects the white and green wires, which we don't
want for corrosion & other issues, but must be present for safety reasons.
Therefore it should have an impedance of at least ________ ohms.
a. 25000
b. 12500
c. 0
d. Less than 5 - ANSWERS-A. 25000 ohms (E-11.6.2.2.4.2)
We have been referencing the galvanic series. Which of the following best
describes it use?
a. Inform us of the potential for interaction between metals
b. Predict corrosion rates of metals
c. Inform us what type of fastener to select
d. Predict what type of electrolyte is needed - ANSWERS-A. Inform us of the
potential for interaction between metals.
,What high performance stainless steel is used for propeller shafting?
a. Nitronic 50
b. Aquamet 17
c. Aquamet 22
d. Monel - ANSWERS-C. Aquamet 22 (Collier Ch 8, pg 69)
The level of cathodic protection is determined by
a. pH levels
b. conductivity measurements
c. Potential measurements
d. continuity measurements - ANSWERS-C. Potential measurements
Which of the following is NOT a type of flow and velocity corrosion?
a. Impingement corrosion
b. Cavitation corrosion
c. Erosion corrosion
d. Crevice corrosion - ANSWERS-D. Crevice corrosion
Which of the following materials would be best for the bolts attaching a bronze
strut to a wood or fiberglass hull vessel?
a. Silicon bronze bolts
b. Yellow brass
c. Stainless steel
d. Galvanized steel - ANSWERS-A. Silicon bronze bolts.
, Which of the following is a marine grade of aluminum?
a. 2000 series
b. 3000 series
c. 5000 series
d. 7000 series - ANSWERS-C. 5000 series
To prevent long-term corrosion of mild steel in a seawater environment, which
of the following coatings would be most effective?
a. Plating with a relatively unstable metal with a significantly more negative
corrosion potential, like zinc or aluminum
b. Plating a highly stable, corrosion-resistant metal like nickel or silver
c. An organic paint containing a high concentration of copper oxide
d. A layer of carbon-epoxy laminate - ANSWERS-A. Plating with a relatively
unstable metal with a significantly more negative corrosion potential, like zinc
or aluminum.
GFCI stands for... - ANSWERS-Ground Fault Circuit Interrupter
T/F A galvanic isolator WILL block stray AC. - ANSWERS-False. A galvanic isolator
WILL NOT block AC. It will only blocks stray DC that is moving through the
green grounding conductor.
T/F An isolation transformer makes a galvanic isolator unnecessary. - ANSWERS-
True.
An isolation transformer works through electromagnetic _________. -
ANSWERS-Induction
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 - ANSWERS-B. #8 AWG green
The reverse polarity light connects the white and green wires, which we don't
want for corrosion & other issues, but must be present for safety reasons.
Therefore it should have an impedance of at least ________ ohms.
a. 25000
b. 12500
c. 0
d. Less than 5 - ANSWERS-A. 25000 ohms (E-11.6.2.2.4.2)
We have been referencing the galvanic series. Which of the following best
describes it use?
a. Inform us of the potential for interaction between metals
b. Predict corrosion rates of metals
c. Inform us what type of fastener to select
d. Predict what type of electrolyte is needed - ANSWERS-A. Inform us of the
potential for interaction between metals.
,What high performance stainless steel is used for propeller shafting?
a. Nitronic 50
b. Aquamet 17
c. Aquamet 22
d. Monel - ANSWERS-C. Aquamet 22 (Collier Ch 8, pg 69)
The level of cathodic protection is determined by
a. pH levels
b. conductivity measurements
c. Potential measurements
d. continuity measurements - ANSWERS-C. Potential measurements
Which of the following is NOT a type of flow and velocity corrosion?
a. Impingement corrosion
b. Cavitation corrosion
c. Erosion corrosion
d. Crevice corrosion - ANSWERS-D. Crevice corrosion
Which of the following materials would be best for the bolts attaching a bronze
strut to a wood or fiberglass hull vessel?
a. Silicon bronze bolts
b. Yellow brass
c. Stainless steel
d. Galvanized steel - ANSWERS-A. Silicon bronze bolts.
, Which of the following is a marine grade of aluminum?
a. 2000 series
b. 3000 series
c. 5000 series
d. 7000 series - ANSWERS-C. 5000 series
To prevent long-term corrosion of mild steel in a seawater environment, which
of the following coatings would be most effective?
a. Plating with a relatively unstable metal with a significantly more negative
corrosion potential, like zinc or aluminum
b. Plating a highly stable, corrosion-resistant metal like nickel or silver
c. An organic paint containing a high concentration of copper oxide
d. A layer of carbon-epoxy laminate - ANSWERS-A. Plating with a relatively
unstable metal with a significantly more negative corrosion potential, like zinc
or aluminum.
GFCI stands for... - ANSWERS-Ground Fault Circuit Interrupter
T/F A galvanic isolator WILL block stray AC. - ANSWERS-False. A galvanic isolator
WILL NOT block AC. It will only blocks stray DC that is moving through the
green grounding conductor.
T/F An isolation transformer makes a galvanic isolator unnecessary. - ANSWERS-
True.
An isolation transformer works through electromagnetic _________. -
ANSWERS-Induction
