Chapter 3

Question 1

Cathodic protection is achieved by

Answer 1

making the structure the cathode of a direct current circuit

Question 2

Define Anode

Answer 2

corroding structure- point where current is discharged

Question 3

define cathode

Answer 3

protected structure - point where current is picked up

Question 4

_________ is the conductive medium between anode and cathode.

Answer 4

electrolyte

Question 5

Name the two methods of cathodic protection

Answer 5

Galvanic anode and impressed current

Question 6

What are the three types of rectifiers?

Answer 6

constant current-current output remains constant independent of circuit resistances

constant voltage- DC voltage remains constant

Constant structure to electrolyte potential - current and voltage vary to maintain a constant potential

Question 7

What is the required potential when using CSE(copper/copper sulfate)

Answer 7

-850mv

Question 8

Current interruption, reference electrode placement and coupons are all methods of

Answer 8

IR drop correction

Question 9

Underground aluminum and copper structures require

_________ mv of polarization.

Answer 9

100 mv of polarization

Question 10

Offshore platforms require a minimum of _____ (V or MV) using a _____ electrode.

Answer 10

800mv or .8 Volts

silver/silver chloride