NACE CP2 Exam With 100% Correct And Verified Answers, Exams of Advanced Education

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NACE CP2 Exam With 100% Correct And

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NACE 2008 Student Manual! START OF CHAPTER 1 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 - Correct Answer-d Metal loss or corrosion occurs at the A) cathode B) anode C) electronic path D) metallic path - Correct 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 - Correct Answer-c True or False (t or f): Ions exist only in the electrolyte? - Correct 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 - Correct Answer-c At the cathodic surface in a corrosion cell, the electrons from the ____ meet ____ ions from the solution. A) cathode, hydrogen B) cathode, OH- C) anode, hydrogen D) anode, OH- - Correct 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 - Correct Answer-a True or false Is oxidation necessarily associated with oxygen? - Correct 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 - Correct 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 - Correct 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 - Correct 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 - Correct 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 - Correct 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 - Correct Answer-c What is the most common iron ore? A) hemophite B) hematite C) magnesium D) calcium E) aluminum - Correct Answer-b True or false Iron is considered thermodynamically unstable? - Correct Answer-t True or false Gold is more noble than zinc? - Correct Answer-t Which of the following metals is most active? A) magnesium B) copper C) iron D) nickel

E) platinum - Correct 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 - Correct Answer-d The driving force for electrochemical corrosion is ____ A) current B) voltage C) resistance D) ohms E) siemens-cm - Correct 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 - Correct 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 - Correct 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 - Correct Answer-e

The ____ expresses the exact electromotive force of a cell in terms of the activities of products and reactants of the cell A) Ernest Equation B) Faraday Equation C) Ohm's Law Equation D) Nernst Equation E) Uniform Equation - Correct Answer-d Given the Nernst Equation, using the Valence of Common Metals Table, and using the partial Standard emf Series of Metals solve: What is the potential of zinc in a 0.01 molar zinc chloride solution at 25C? A) -0.892V B) -0.287V C) -0.827V D) -0.297V E) -0.889V - Correct Answer-c E= -0.763 + (0.059/2) * log (0.71 *0.01/1) = -0.827V Standard conditions for pure metals in the emf series are based on one unit activity of metal ions in the electrolyte at ___ C with no impurities in the metal or electrolyte and with reference to a standard ____ electrode. A) 25, hydrogen B) 35, hydrogen C) 25, CSE D) 35, CSE E) 25, SSC F) 35, SSC - Correct Answer-a The ____ the concentration of metal ions in the electrolyte, the ____ the metal. A) lower, less active B) higher, less active C) lower, more active D) higher, less active - Correct Answer-b

In reference to the temperature in a corrosion cell, in most cases, electrode at the _____ temperature becomes the ____ A) lower, anode B) higher, cathode C) lower, cathode D) higher, anode - Correct Answer-d During metal fabrication of structures, highly stressed areas of a metal will tend to be at ____ energy levels, thus more ____ than less stressed areas A) higher, active B) lower, active C) higher, inactive D) lower, inactive - Correct Answer-a True or False (t or f): Corrosion cells may form because of differences in the electrolyte - Correct Answer-t ____ cells are responsible for much of the corrosion that take place in soils, particularly in bare or poorly coated pipe A) concentration B) steady state C) carbon D) dynamic E) telluric - Correct Answer-a In many cases in naturally occurring soils, a portion of pipe lying in the more _____ soil is the ____ and in the less ____soil is the ___. A) inductive, anode / inductive, cathode B) inductive, cathode / inductive, anode C) conductive, anode / conductive, cathode D) conductive, cathode /conductive, anode - Correct Answer-c The two most common types of concentration cells involved in promoting corrosion are ____ and ____. A) oxygen, nonmettalic ion B) oxygen, calcium C) lack of oxygen, metal ion D) oxygen, metal ion - Correct Answer-d

What is the most common of the cathodic depolarizers, that can maintain and promote a cathodic reaction? A) CO B) oxygen C) carbon D) OH- E) Hydrogen - Correct Answer-b Most corrosion on pipelines is on the ____ portion of the pipe A) sides B) top C) bottom - Correct Answer-c If a pipe is running through a section of pavement and through a section of non pavement: A) anode is the metal outside the pavement, the cathode is the metal under the pavement B) anode is the metal under the pavement, the cathode is the metal outside the pavement C) cathode is the metal under the pavement, the anode is the metal outside the pavement - Correct Answer-b In a metal ion concentration cell, the surface in contact with ____ concentration of metal ions acts as the ____ A) lower, anode B) lower, cathode C) higher, anode D) higher cathode - Correct Answer-a Theoretically, the potential of a structure changes by about ____mV for each pH unit A) 40 B) 50 C) 20 D) 70 E) 60 - Correct Answer-e The corrosion potential of a metal might be -500mV in an environment with a pH of 7, but the corrosion potential might be ____ at a pH of 8? A) -440mV B) -660mV

C) -300mV D) -560mV - Correct Answer-d True or false (t or f) an acidic pH can be harmful to concrete, such as reinforced concrete structures? - Correct Answer-t A pH of less than ____ is considered to be harmful to concrete? A) 4 B) 6 C) 5 D) 2 E) 8 - Correct Answer-c The rate of corrosion is directly ____ to ____ flow? A) inproporinate, current B) inproporinate, voltage C) proportional, voltage D) proportional, current - Correct Answer-d If a 1 Amp CP system must last 40 years and the electrochemical equivalent for silicon chromium cast iron anodes is 0.75 lb/A-yr, how many pounds of anodes are needed? A) 50lbs B) 35lbs C) 25 lbs D) 45lbs E) 30lbs - Correct Answer-e All things being equal, the greater the magnitude of the difference between two voltages of metals, the ____ the current flow and rate of corrosion A) higher B) lower - Correct Answer-a True or False ( t or f) Magnesium will corrode at a slower rate when connected to steel rather than zinc? - Correct Answer-f Which reference electrode is considered a primary reference electrode because it is used to determine the potential of other secondary reference electrodes that are better suited for field use?

A) CSE

B) Ag/AgCI C) Calomel D) Zinc E) SHE - Correct Answer-e Most common used reference electrode for measuring potentials of underground structures? A) CSE B) Ag/AgCI C) Calomel D) Zinc E) SHE - Correct Answer-a True or false (t or f) The potential of a reference electrode in the sun can decrease from 10 to 50mV versus an electrode kept in the dark? - Correct Answer-t Which reference electrode is mostly commonly used in seawater? A) CSE B) Ag/AgCI C) Calomel D) Zinc E) SHE - Correct Answer-b Which reference electrode is mostly commonly used in concrete structures? A) CSE B) Ag/AgCI C) Calomel D) Zinc E) SHE - Correct Answer-b Which of the following is primarily a laboratory electrode? A) CSE B) Ag/AgCI C) Calomel D) Zinc - Correct Answer-c

When doing a structure to electrolyte potential , the structure is connected via the _____ terminal and the reference is connected via the _____ terminal A) negative , positive B) positive, negative - Correct Answer-b A potential of -0.810Vcse converted to Calomel (SCE) A) +0.306 sce B) -0.750 sce C) -0.735 sce - Correct Answer-c A potential of -0.810Vcse converted to Ag/AgCI (SSC) A) +0.306 ssc B) -0.735 ssc C) -0.750 ssc - Correct Answer-c A potential of -0.810Vcse converted to Zinc (ZRE) A) +0.306 zre B) -0.735 zre C) -0.750 zre - Correct Answer-a True or False (t or f) The potential of a STATIONARY reference electrode should be checked from time to time with a portable reference electrode that is known to be accurate under "no current" conditions. - Correct Answer-t As current is impressed on a metal over time, where does polarization occur? A) at the anode and the cathode B) at the anode C) at the cathode - Correct Answer-a Polarization _____ the potential difference between the anode and the cathode and by Ohm's Law, the current ___ and the corrosion rate ____ until an equilibrium is reached A) lowers, drops, decreases B) increases, increases, decreases C) lowers, increases, decreases D) lowers, drops, decreases - Correct Answer-d

Depolarizers include: I dissolved oxygen II microbiological activity III water flow A) only I B) only II C) I and II D) I, II , III - Correct Answer-d The name for the current that exists during the steady state of polarization is called the _____ of the system A) telluric current B) dynamic current C) corrosion current D) mixed potential current E) closed current - Correct Answer-c The potential normally measured between the polarized cathode potential and the polarized anode potential A) mixed potential B) corrosion potential C) corrosion current D) open circuit potential - Correct Answer-a _____ are the potentials of the cathode and anode when the corrosion current is zero A) mixed potentials B) corrosion potentials C) corrosion current potentials D) open circuit potentials - Correct Answer-d ______ is the result of the reaction steps at the structure/electrolyte interface including the actual transfer of charge A) activation polarization B) concentration polarization C) mixed polarization D) reactant polarization - Correct Answer-a In concentrated acids, _______ polarization predominates A) activation polarization

B) concentration polarization C) mixed polarization D) reactant polarization - Correct Answer-a _______ is the result of reaction steps involving the diffusion of reactants up to the reaction products away from the reaction surface A) activation polarization B) concentration polarization C) mixed polarization D) reactant polarization - Correct Answer-b Anything that causes a depletion of available reactants or a buildup of reaction products results in a ____ in the reaction rate and an _____ in concentration polarization. A) decrease, increase B) increase, decrease - Correct Answer-a If the slowest step in the overall process involves waiting for arrival of reactants or the removal of reaction products, the reaction is under __________ control. A) activation polarization B) concentration polarization - Correct Answer-b If the slowest step in the overall reaction process is is on the metal surface or in the charge transfer reaction the process is under _____ A) activation polarization B) concentration polarization - Correct Answer-a __________ usually predominates in electrolytes where the concentration of the reactants is low, as with dilute solutions, or there is a buildup of reaction products from activation polarization or in stagnant environments. A) activation polarization B) concentration polarization - Correct Answer-b As polarization ____ , current _____ A) increases, decreases B) decreases, decreases C) increases, increases D) decreases, increases - Correct Answer-c

An increase in ions will result in a ____ in resistivity A) increase B) decrease - Correct Answer-b The effect of current concentrated on a small area will be ____ than the effect of the same amount of current on a ____ area. A coated structure will polarize more rapidly than a bare structure A) larger, larger B) less, larger C) greater, smaller D) smaller, smaller E) greater, larger - Correct Answer-e True or False (t or f) A small anode and a large cathode is desirable - Correct Answer-f A(n) ____ in temperature has a tendency to ____ chemical reactions, which _____ the electrodes and _____ current A) increase, increase, depolarizes, increases B) increase, increase, depolarizes, decrease C) decrease, decrease, polarize, increase D) decrease, increase, polarize, decrease - Correct Answer-a A(n) ____ in temperature results in a(n) ____ in polarization A) increase, decrease B) increase, increase C) decrease, increase D) decrease, decrease - Correct Answer-c ____ movement results in a ____ in polarization and a(n) _____ in current A) decreased, decrease, decrease B) decreased, increase, decrease C) increased, increase, decrease D) increased, decrease, decrease E) increased, increase, increase - Correct Answer-d A(n) _____ in the metal ion concentration of the anode metal results in a(n) ____ in polarization of the anode and a(n) ____ in current

A) increase, decrease, decrease B) decrease, decrease, decrease C) decrease, increase, decrease D) increase, increase, decrease E) decrease, decrease, increase - Correct Answer-e Polarization of the cathode can be affected by the concentration of cathodic reactants, such as _____ or _____ ions A) CO2, OH- B) oxygen, OH- C) carbon, OH- D) oxygen, hydrogen - Correct Answer-d In regards to cathodic reactants, a(n) _____ in the concentration of either of the reactants of oxygen or hydrogen will _____ polarization of the cathode and _____ current and vice versa A) increase, decrease, decrease B) decrease, decrease, decrease C) increase, decrease, increase D) increase, increase, decrease E) decrease, decrease, increase - Correct Answer-c Passivity can be defined as the A) gain of chemical reactivity B) polarization of chemical reactivity C) loss of chemical reactivity D) depolarization of molecular reactivity E) polarization of molecular reactivity - Correct Answer-c The ____ region is when a slight increase in corrosion potential causes the corrosion current to increase A) transpassive B) passive C) nonpassive D) active - Correct Answer-d The ____ region is when the corrosion potential increases to a certain point, however, the corrosion current suddenly decreases and remain essentially constant A) transpassive B) passive

C) nonpassive D) active - Correct Answer-b The ____ region occurs if the potential is increased sufficiently thus current again increases A) transpassive B) passive C) nonpassive D) active - Correct Answer-a For the active (or nonpassivating) metal, as corrosion potential _____, corrosion current ____, more or less logarithmically (or linearly on a semi- log graph). A) increases, increases B) decreases, decreases C) increases, decreases D) decreases, increases - Correct Answer-a This type of film which forms naturally on most metals when they are exposed to the air, can provide substantial protection against further attack by many environments A) ore B) oxide C) reductant D) selimum - Correct Answer-b Type of corrosion with an even loss of metal over the entire area or a large area of the structure A) Galvanic attack B) intergranular attack C) selective leaching D) velocity phenomena E) pitting F) crevice corrosion G) uniform attack - Correct Answer-g This type of corrosion occurs where two tightly spaced surfaces - either two metals or a metal and nonmetal - are exposed to a corroding environment. Holes, gasket surfaces, lap joints, surface deposits, and crevices are likely places for this type of corrosion. A) Galvanic attack B) intergranular attack

C) selective leaching D) velocity phenomena E) pitting F) crevice corrosion G) uniform attack - Correct Answer-f This corrosion occurs when two dissimilar metals are connected. The potential of the two metals creates a voltage difference, the driving force for corrosion. A) Galvanic attack B) intergranular attack C) selective leaching D) velocity phenomena E) pitting F) crevice corrosion G) uniform attack - Correct Answer-a Localized corrosion that occurs over a small area of the metal surface and leaves holes in the surface. A) Galvanic attack B) intergranular attack C) selective leaching D) velocity phenomena E) pitting F) crevice corrosion G) uniform attack - Correct Answer-e This is a local corrosion attack at the grain boundaries of an alloy. It is caused by a difference in element composition near the boundaries, compared to the rest of the alloy. A) Galvanic attack B) intergranular attack C) selective leaching D) velocity phenomena E) pitting F) crevice corrosion G) uniform attack - Correct Answer-b This type of corrosion involves the certain removal of one of the elements from an alloy. A) Galvanic attack B) intergranular attack

C) selective leaching D) velocity phenomena E) pitting F) crevice corrosion G) uniform attack - Correct Answer-c This corrosion is associated with rapid movement of a corrosive fluid over a metal, removing corrosion products. A) Galvanic attack B) intergranular attack C) selective leaching D) velocity phenomena E) pitting F) crevice corrosion G) uniform attack - Correct Answer-d results from the reaction of the metal with a corrosive environment and the presence of a stress A) Galvanic attack B) intergranular attack C) selective leaching D) velocity phenomena E) environmental cracking F) crevice corrosion G) uniform attack - Correct Answer-d In general, hydrogen is generated in neutral environments at - ____ mV CSE A) 1, B) 1, C) 1, D) 1,200 - Correct Answer-b For aluminum, the polarized potential must be kept below - _____ mV CSE to avoid alkali corrosion A) 1, B) 1, C) 1, D) 1,200 - Correct Answer-d For titanium, the maximum

potential is ____ mV ssc to prevent hydriding A) 800 B) 700 C) 1, D) 1,200 - Correct Answer-b For prestressed concrete, polarized potentials more negative than -____ mV should be avoided A) 1, B) 1, C) 1, D) 1,200 - Correct Answer-a The cracking of a metal under an applied tensile stress in the presence of a corrosive environment A) stress corrosion cracking B) intergranular attack C) selective leaching D) velocity phenomena E) pitting - Correct Answer-a Stress Corrosion Cracking occurs in a narrow potential range of ______ at a pH between ______ , and is more likely at ____ temperatures A) -525 to -725, 5 and 7, more B) -625 to -825, 7 and 9.5, less C) -525 to -725, 8 and 10.5, more D) -625 to 700, 8 and 10.5, less - Correct Answer-c True or False (t or f) MIC exist under non anaerobic conditions (presence of great oxygen) - Correct Answer- f In relation to MIC, consumption of _____ at the structure surface _____ the steel at cathodic areas and permits more rapid consumption of the metal by galvanic corrosion cells A) hydrogen, polarizes B) hydrogen, depolarizes C) OH-, polarizes D) OH-, depolarizes END OF CHAPTER 1 - Correct Answer-b

START OF CHAPTER2:

Corrosion of the metal will cease once the applied cathodic protection current _______ the corrosion current. A) equals B) equals or exceeds C) falls below - Correct Answer-b As the potentials of the ___ sites polarize toward the potentials of the ____ sites, corrosion current is ____. A) anodic, cathodic, increase B) cathodic, anodic, reduced C) cathodic, anodic, increase D) anodic, cathodic, decrease - Correct Answer-b Polarization occurs in a step-like manner with the more ____ or ____ sites polarizing first. A) positive, anodic B) positive, cathodic C) negative, anodic D) negative, cathodic - Correct Answer-b To mitigate corrosion, all existing cathode sites must be electronegatively polarized to a potential ____ to the open circuit potential of the most ___ ____ potential existing on the structure. A) equal, inactive, cathode B) unequal, active, anode C) unequal, inactive, cathode D) equal, active, anode - Correct Answer-d Polarization of the ____ to the ____ potential of the anodes is the true criterion for eliminating corrosion. A) cathodes, closed circuit B) anodes, closed circuit C) cathodes, open circuit D) anodes, open circuit - Correct Answer-c Bare Pipe: What is the current required to protect an uncoated 30.48 cm (12 in.) diameter

steel pipeline 1,524 m (5,000 ft) in length that is buried in soil with a resistivity of 10,000 Ω-cm? Assume experience has shown that adequate levels of cathodic protection can be achieved from 10.76 mA/m 2 (1 mA/ ft 2 ) of bare surface area. A) 16.8A B) 15.7A C) 14.7A D 13.8A - Correct Answer-b Coated Pipe: What is the current required to protect an uncoated 30.48 cm (12 in.) diameter steel pipeline 1,524 m (5,000 ft) in length that is buried in soil with a resistivity of 10,000 Ω-cm? Assume that 5 percent of the pipe contains holidays or defects in the coating A)0.8538A B) 1.785A C) 0.785A D) 2.754A - Correct Answer-c For a cathodic protection system, a(n) ____ in the cathodic polarization is desired to _____ the current requirement for the structure. A) decrease, increase B) increase, increase C) decrease, decrease D) increase, decrease - Correct Answer-d The current required for cathodic protection generally is _____ in low pH (acids) than in high pH (basic) and neutral environments. A) lower B) greater - Correct Answer-b What two phenomena account for the increase in CP current requirement in low pH environments? A) shift in the negative directions of the structure's open circuit cathode potential / a flattening of cathodic polarization curve for the structure

B) shift in the positive direction of the structure's open circuit cathode potential / a flattening of cathodic polarization curve for the structure - Correct Answer-b The structure's cathodic polarization slope is flattened with _____ acidity because of the increased concentration of reducible _____ ion A) increasing, hydrogen B) decreasing, hydrogen C) increasing, OH- D) decreasing, OH- - Correct Answer-a True or False (t or f) The pH of an electrolyte (soil or water) is USUALLY a neutral 7 - Correct Answer-f _______ (an acid salt) used as a fertilizer tends to decrease pH of the soil. A) calcium sulfate B) ammonium sulfate C) carbon sulfate D) magnesium sulfate - Correct Answer-b _____ in temperature has a depolarizing effect A) increase B) decrease - Correct Answer-a When the rate of reduction reaction is ____, it ____ the level of polarization and _____ the cathodic protection current requirement A) increased, increases, increases B) increased, decreases, decreases C) increased, decreases, increases D) decreased, increases, decreases E) decreased, decreases, decreases - Correct Answer-c Increased temperature will ____ ionization A) increase B) decrease - Correct Answer-a As ionization _____, the electrolyte's conductivity _____, which _____ corrosion current and the amount of cathodic protection current required for adequate protection. A) increases, increases, increases

B) increases, decreases, decreases C) increases, decreases, increases D) decreases, increases, decreases E) decreases, decreases, decreases - Correct Answer-a Oxygen or other oxidizers ____ the current requirements as a result of flattening the cathodic polarization slope A) increase B) decrease - Correct Answer-a True or False (t or f) structures in well aerated soils, such as sand and gravel, require more cathodic protection current than structures surrounded by relatively deaerated soils, such as clay. - Correct Answer-t A(n) _____ in the relative movement between the electrolyte and the structure causes a(n) _____ in current requirement A) increase, decrease B) increase, increase C) decrease, increase D) decrease, decrease - Correct Answer-b True or False (t or f) a ship under way requires less cathodic protection current than a ship at rest - Correct Answer-f To reduce the residual corrosion current to zero, cathodic protection current must be _______ A) disproportionately increased B) disproportionately decreased C) proportionately increased D) proportionately decreased - Correct Answer-a The relationship between applied cathodic protection current and corrosion rate is ____ A) proportional B) disproportional C) logarithmic - Correct Answer-c In regards to amphoteric metals: The formation of ____ ions at the cathode causes the pH of the electrolyte next to

the cathode to become ____. A) hydroxyl, aciditic B) hydrogen, aciditic C) hydroxyl, aciditic D) hydroxyl, alkaline - Correct Answer-d For pipeline coatings, polarized potential values more negative than ____ mV CSE should be avoided. A) -1000 B) -1500 C) -1200 D) -850 - Correct Answer-c Control of External Corrosion on Underground or Submerged Metallic Piping Systems A) SP0170 B) SP0169 C) SP0007 D)SP0175 - Correct Answer-b True or False (t or f) The potential of interest when determining adequate cathodic protection is the polarized potential across the structure/electrolyte interface - Correct Answer-t Figure 2.15 E true = A) Structure to electrolyte potential B) Reference-to-earth resistance C) Pipe-to-earth resistance - Correct Answer-a Figure 2.15 R r,e = A) Structure to electrolyte potential B) Reference-to-earth resistance C) Pipe-to-earth resistance - Correct Answer-b Figure 2.15 R p,e = A) Structure to electrolyte potential

B) Reference-to-earth resistance C) Pipe-to-earth resistance - Correct Answer-c Figure 2.15 (a) Electrical Schematic of the Structure to Electrolyte Measurement Circuit A) Vm = Rm/Rt * Etrue B) Vm= Rt/Rm * Etrue C) Vm = Rt/Etrue * Rm D) Vm = Rm/Etrue *Rm - Correct Answer-a Do you want high or low impedance on your internal circuit of your meter? A) low B) high - Correct Answer-b The IR drop across the electrolyte can be reduced to near zero by placing the reference electrode ____ the structure coating holiday or by ____ the current flow A) far, allowing B) near, interrupting - Correct Answer-b The criterion for cathodically protecting aluminum based on NACE Standard SP0169 is a minimum of ___ mV of polarization as measured between the structure surface and a stable reference electrode contacting the electrolyte. A) 50 B) 75 C) 100 D) 25 - Correct Answer-c True or false (t or f) Aluminum is NOT amphoteric - Correct Answer-f Aluminum corrodes under ____ conditions A) both acid and alkaline B) acidic only C) alkaline only - Correct Answer-a The criteria for the cathodic protection of copper based on NACE Standard SP0169 is a minimum of 100 mV of polarization as measured between the structure surface and a stable reference electrode contacting the electrolyte. A) 50 B) 75

C) 100

D) 25 - Correct Answer-c NACE Standard ____, "Cathodic Protection of Reinforcing Steel in Atmospherically Exposed Concrete Structures," A) SP0169 B) SP0250 C) SP0290 D) SP1000 - Correct Answer-c True or False (t or f) The second criterion for reinforced concrete structures is that that the polarized potential be at least as negative as the potential at the base of the Tafel Slope on an E-Log I curve. - Correct Answer-t In relation to reinforced concrete structures: The E-Log I test is performed by incrementally ____ the cathodic protection current from the installed system. At each interval, the _____ potential of the steel reinforcement is measured relative to a stable reference electrode. A) decreasing, IR drop B) increasing, IR drop - Correct Answer-b In relation to reinforced concrete structures: The third criterion in this standard is that the ____ potential is statistically more ____ than the statistical standard deviation of the native potentials. A) depolarized , positive B) depolarized, negative C) polarized, positive D) polarized, negative - Correct Answer-d Minimum voltage for anerobic soils or soils containing SRB A) -850mV B) -900mV C) -950mV D)-1000mV - Correct Answer-c In relation to E log I: