NACE CP2 Quiz 1 Questions and Answers (Verified Answers)

NACE CP2 Quiz 1 Questions and Answers (Verified Answers) The elements of a corrosion cell include which of the following? 1. Anode 2. Cathode 3. Electrolyte 4. Electronic Path All of the Above Faraday's Law calculates the A. potential of a metal in seawater B. potential of a metal in the metal ion solution C. metal lost based on the resistance D. metal lost due to current over time D. metal Lost due to current over time An environment where cathodic protection is NOT effective is A. liquid B. soil C. atmospherically exposed surface D. steel in concrete C. atmospherically exposed surface Reference electrodes include which of the following? 1. Copper-copper sulfate 2. Hydrogen 3. Calomel 4. Silver-silver chloride All of the above The stability of a copper-copper sulfate reference electrode does not vary with A. temperature B. exposure to sunlight C. an unsaturated solution of copper ions D. a saturated solution of copper ions D. a saturated solution of copper ions The cathodic protection criteria for steel includes which of the following? 1. A potential of -850 mVCSE or more negative with current applied after IR drop is considered 2. A polarized potential of -850 mVCSE or more negative 3. polarization of 100 mV or greater 4. A polarized potential of -790 mV AgAgCl or more negative All of the above If a potential of -484 mV is measured with respect to a hydrogen electrode, what is a the potential to copper-copper sulfate? A. -168 mVCSE B. -316 mVCSE C. -800 mVCSE D. -1116 mVCSE C. -800 mVCSE E1 + (CF1) = E2 + (CF2) -484 mVCSE + 0 = E2 + (316 mV) E2 = -800 mVCSE When cathodic protection is applied to a corroding steel surface, it shifts the corrosion cell potential as follows: A. No change in potential B. Cathode more negative C. Cathode more positive D. Anode more positive B. Cathode more negative Cathodic protection polarizes A. the open circuit potential of the structure anode to the structure cathode potential B. the open circuit potential of the structure cathode to the structure anode potential C. the open circuit potential of the structure cathode to the CP anode potential D. the open circuit CP anode potential to the structure cathode potential B. the open circuit potential of the structure cathode to the structure anode potential If a digital meter displays a negative value while measuring a voltage across a resistor, it indicated that the A. current is from the positive to the negative meter connection B. current is from the negative to the positive meter connection C. meter is reading incorrectly D. meter scale should be changed B. current is from negative to positive meter connection Polarization occurs A. at the anode surface only B. at the cathode surface only C. at the anode and cathode surfaces D. in the metallic path C. at the anode and cathode surfaces Which of the following are depolarizers? 1. Dissolved oxygen