NACE (NATIONAL ASSOCIATION OF CORROSION ENGINEERS)
CP2 EXAM LATEST 2023-2024 REAL EXAM 400+ QUESTIONS
AND CORRECT ANSWERS|AGRADE
Corrosion is an electrochemical process involving
A) flow of protons and electrons
B) flow of neutrons and ions
C) flow of protons and ions
D) flow of electrons and ions
E) flow of resistance and resistivity – ANSWER- d
Metal loss or corrosion occurs at the
A) cathode
B) anode
C) electronic path
D) metallic path – ANSWER- b
What are the four parts of the corrosion cell
A) anode, resistor, electrolyte, metallic path
B) anode, cathode, electron, electronic path
C) anode, cathode, electrolyte, metallic path – ANSWER- c
True or False (t or f):
Ions exist only in the electrolyte? – ANSWER- t
Electrons flow in a corrosion cell by which of the following paths?
A) anode to cathode via electrolyte
B) cathode to anode via electronic path
C) anode to cathode via electronic path – ANSWER- c
At the cathodic surface in a corrosion cell, the electrons from the _ meet ions
from the solution.
A) cathode, hydrogen
B) cathode, OHC) anode, hydrogen
D) anode, OH- – ANSWER- c
Oxidation of the metal occurs at the ___
surfaces and reduction of _ ions occurs at the .
A) anodic, hydrogen, cathodes
B) cathode, OH-, anodic
C) anodic, OH-, cathodes
D) cathode, anodic, electrolyte
E) cathode, hydrogen, electrolyte – ANSWER- a
True or false
Is oxidation necessarily associated with oxygen? – ANSWER- f
Current flow in a corrosion cell flows which path:
A) anode to metallic path to cathode
B) anode to electronic path to cathode
C) cathode to metallic to anode
D) cathode to electrolyte to anode
E) anode to electrolyte to cathode
Voltage is the measure of the electrochemical difference between two electrodes
in an electrolyte – ANSWER- e
_ is the measure of the electrochemical difference between two electrodes in an electrolyte A) current B) resistance C) error D) ohms E) ohms-cm F) voltage – ANSWER- f The _
represents the reversible work to move a unit charge from the electrode surface
through the solution to the reference electrode
A) current potential
B) electrode potential
C) resistance potential
D) ohms potential
E) Faraday potential – ANSWER- b
Metals occur in nature in the form of various chemical compounds referred to as
A) ores
B) anodic metals
C) cathodic metals
D) carbohydrates – ANSWER- a
The amount of energy required by a metal during the refining
process determines the _ or of the metal.
A) current, active state
B) voltage, active state
C) active resistance, voltage
D) resistance, active state
E) current, active resistance – ANSWER- b
During the refining stage of metal the the energy, the more _
the metal and the more tendency it has to corrode.
A) higher, inactive
B) lower, active
C) higher, active
D) lower, inactive – ANSWER- c
What is the most common iron ore?
A) hemophite
B) hematite
C) magnesium
D) calcium
E) aluminum – ANSWER- b
True or false
Iron is considered thermodynamically unstable? – ANSWER- t
True or false
Gold is more noble than zinc? – ANSWER- t
Which of the following metals is most active?
A) magnesium
B) copper
C) iron
D) nickel
E) platinum – ANSWER- a
Electromotive force (emf), is _ in sign and magnitude to the electrode potential of the less the electrode potential of the . A) unequal, cathode, anode B) unequal, anode, cathode C) equal, cathode, anode D) equal, anode, cathode – ANSWER- d The driving force for electrochemical corrosion is
A) current
B) voltage
C) resistance
D) ohms
E) siemens-cm – ANSWER- b
In relation to a corrosion cell, _ is the net transfer of electric charge per unit time A) current B) voltage C) resistance D) ohms E) siemens-cm – ANSWER- a If a metallic path connects two electrodes inside an electrolyte, the difference will
cause a
___ to flow between them
A) current, voltage
B) resistance, current
C) resistance, voltage
D) voltage, current
E) current, resistance – ANSWER- d
The more useful method of organizing metals in order of their tendency to corrode is
A) emf series
B) pgp series
C) nuclear series
D) electron series
E) galvanic series – ANSWER- e
The __ expresses the exact electromotive force of a cell in terms of the activities of
products and reactants of the cell