NACE CP 2 Quiz 2 Questions & Answers 100% Correct

If 5.0 A of battery current passes through the outside leads of a 4-wire current span spaced at 30 m (100 ft), resulting in a voltage drop of 5.0 mV with the test current applied and of 1 mV without the test current, what is a the calibration factor of the current span? A. 0.00025 A/mV B. 4.0 A/mV C. 1.25 A/mV D. 5.0 A/mV - ANSWER-C. 1.25 A/mV I = 5 A EC = 5 mV ENC = 1 mV K = I/(EC - ENC) = 5 A/(5 mV - 1 mV) = 1.25 A/mV Polarized potentials are measured A. when the rectifiers are ON B. just after the rectifiers are turned OFF C. after the rectifiers are left off for several days D. just after the Rectifiers are turned ON - ANSWER-B. just after the rectifiers are turned OFF Polarization is determined by A. Subtracting the ON from the instant OFF potential B. Measuring the instant OFF potential C. Subtracting the instant OFF from the Native (free corroding) potential D. Substracting the IR drop from the ON potential - ANSWER-C. Subtracting the instant OFF from the Native (free corroding) potential Current pickup on a pipeline is indicated when