NACE CP 2 Quiz 3 with Complete Solutions!

A mitigation control bond should be designed to 1. carry the necessary current 2. restrict the current to that required to mitigate the problem 3. keep the current going in one direction if necessary 4. return the potential on the interfered with structure to its pre-interference state - ANSWER-All of the above A mitigation bond may cause more problems under which of the following conditions? 1. Where the interfering structure bond point is more electropositive than the interfered with structure 2. Where the interfering structure bond point is more more electronegative than the interfered with structure 3. Where there are more than one, or changing, current discharge points 4. Where the interfering structure bond point potential varies from being more electronegative to more electropositive than the i - ANSWER-1, 3 and 4 1. Where the interfering structure bond point is more electropositive than the interfered with structure 3. Where there are more than one, or changing, current discharge points 4. Where the interfering structure bond point potential varies from being more electronegative to more electropositive than the interfered with structure AC voltages on pipelines do NOT result from A. resistive (conductive) coupling B. electrostatic (capacitive) coupling C. electromagnetic induction coupling D. thermodynamic coupling - ANSWER-D. Thermodynamic coupling On a cathodically protected pipeline, AC corrosion can be expected at which current densities? 1. 30 mA/m2 2. 10 A/m2 3. 110 A/m2 4. 200 A/m2 - ANSWER-3 and 4 A close interval potential survey is a test where structure-to-electrolyte potentials are measured A. at 1 to 5 meter spacing along a pipeline B. at 1 to 3 kilometer spacing along a pipeline C. at the quarter points around a large tank D. close to the DC power source - ANSWER-A. At 1 to 5 meter spacing along pipeline The AC voltage-to-ground on a section of pipeline paralleling AND crossing a power line tends to