CP-TESTER QUIZ CHAPTER 3

Question 1

Compared to magnesium anode’s, zinc anode tend to have a

Answer 1

Less negative open circuit potential

Question 2

Compared to zinc anode’s, magnesium anodes and high resistivity soil

Answer 2

Will deliver a higher current

Question 3

A constant voltage rectifier is normally adjusted by changing

Answer 3

Secondary transformer taps

Question 4

In an impressed current system

Answer 4

The rectifier positive terminal is connected to the anodes

Question 5

Which is a more active metal

Answer 5

New steel in freshwater

Question 6

The quantity of polarization is determined by

Answer 6

Off-native structure to electrolyte potential

Question 7

The polarized potential criterion of -850 mVcse for cathodic protection is for which metal

Answer 7

Steel

Question 8

The criterion of -850 mV is referenced to which electrode

Answer 8

Copper-copper sulfate

Question 9

Typically I cathodic protection rectifier will have

Answer 9

Transformer, rectifying element,volt meter and ammeter

Question 10

A commonly used galvanic anode materials for steel is

Answer 10

Magnesium

Question 11

Galvanic anodes are generally used where

Answer 11

A small amount of current is required

Question 12

In a galvanic anode installation,the

Answer 12

Buried wire between the anode and structure receives cothodic protection

Question 13

Compared to magnesium anodes, zinc anodes

Answer 13

Have a more noble open circuit potential

Question 14

Compared to zinc anode’s of the same size and shape, magnesium anode’s

Answer 14

Will deliver higher current in a high soil resistivity

Question 15

If the external circuit resistance of a constant voltage rectifier increases by two times, the following will occur

Answer 15

The current will be reduced by one half

Question 16

In an impressed current system

Answer 16

The positive terminal of the DC power source is connected to the
Anode’s

Question 17

The criterion for cothodic protection of -850 mV applies to which of the following conditions

Answer 17

Only steel or cast iron

Referenced to a copper copper sulfate electrode

Question 18

When the cathodic protection current is interrupted the difference in potential with current applied and that instant off potential is the

Answer 18

IR drop

Question 19

Which of the following will likely reduce the current requirement for cathodic protection

Answer 19

Decreased oxygen

Question 20

Compared to an impressed current system, a galvanic anode system in soil has the following advantage

Answer 20

No external power is required