NACE CP 2 Quiz 1 Questions and answers

NACE CP 2 Quiz 1 Questions and answers The elements of a corrosion cell include which of the following? 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 An environment where cathodic protection is NOT effective is A. liquid B. soil D. steel in concrete Reference electrodes include which of the following? 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 The cathodic protection criteria for steel includes which of the following? 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 D. -1116 mVCSE When cathodic protection is applied to a corroding steel surface, it shifts the corrosion cell potential as follows: A. No change in potential C. Cathode more positive D. Anode more positive Cathodic protection polarizes A. the open circuit potential of the structure anode to the structure cathode 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 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 C. meter is reading incorrectly D. meter scale should be changed Polarization occurs A. at the anode surface only B. at the cathode surface only D. in the metallic path Which of the following are depolarizers? 1. Dissolved oxygen 2. Increased electrolyte velocity 3. Bacteria action 4. Current pickup on the metal Which of the following factors affect polarization? What is the current required to protect an underground bare steel tank that is 3 m (9.8 ft) in diameter and 5 m (16.4 ft) long in resistivity of 10,000 ohm-cm assuming 10.76 mA/m2 (1 mA/ft2) will provide protection? A. 471 mA B. 543 mA D. 754 mA The current requirement for cathodic protection of a structure will increase with a