Chapter 3 and 4

Question 0

In a rectifier, the transformer alternating current (AC) to direct current (DC)

Answer 0

False

Question 1

The positive lead of the rectifier is always connected to the structure

Answer 1

False

Question 2

Magnesium, zinc and aluminum are common ICCP anodes

Answer 2

False

Question 3

The Department of Transportation requires use of CP on residential propane tanks

Answer 3

False

Question 4

CP can be used him to come structures, but not submerged structures

Answer 4

False

Question 5

Solar panels rectify AC to DC

Answer 5

False

Question 6

Galvanic and impress current cathodic protection frequently uses the same metals for anodes.

Answer 6

False

Question 7

Per DOT guidelines, water lines must be cathodically protected

Answer 7

False

Question 8

CP cannot be used to protect aboveground storage tanks

Answer 8

It depends

Question 9

Which reference is best suited for soil

Answer 9

CSE

Question 10

Positive lead of the voltmeter should be placed on the structure during the structure to electrolyte reading

Answer 10

True

Question 11

Standard hydrogen electrodes are commonly used in the field

Answer 11

False

Question 12

The three criteria recommended by NACE are

Answer 12

850 applied 850 off 100 mV of polarization

Question 13

The native potential can be calculated by

Answer 13

The polarization from the polarized potential

Question 14

IR drop is calculated by subtracting

Answer 14

Polarized potential from the applied potential

Question 15

IR drop must be considered for the -850 mV polarized criteria

Answer 15

False

Question 16

IR drop must be considered for the -850mV applied criteria

Answer 16

True

Question 17

I R drop must be considered for the 100 mV polarization criteria

Answer 17

False

Question 18

-850mV Applied is the most widely used criteria

Answer 18

True

Question 19

The driving voltage of the cathodic protection system must be greater than what to provide effective cathodic protection

Answer 19

Driving voltage of corrosion cell

Question 20

The sole purpose of the cathodic protection ground bed is too?

Answer 20

Discharge current

Question 21

When cathodic protection current is applied to a structure, which direction does the potential of the structure shift

Answer 21

Active direction also known as negative direction

Question 22

Two methods utilized to produce the Cathodic protection current

Answer 22

Impressed current and galvanic anodes

Question 23

Define CSE

Answer 23

Copper – copper sulfate electrode the most common reference electrode used to take pipe just saw potential readings

Question 24

Define pipe-to-soil potential

Answer 24

The potential of a pipeline at a given location compared to a reference electrode

Question 25

Define the on potential

Answer 25

The potential measurement is taken with the CP system energized

Question 26

Define off or instant-off potential

Answer 26

The potential measurement is taken with the CP system not energized also known as polarized potential

Question 27

How does the use of underground pipe line coatings affect the current requirement to achieve cathodic protection

Answer 27

Hey well coated pipe will need less current to protect the uncoated parts of the pipe

Question 28

What is a possible to protect more miles of large diameter pipe from a single cathodic protection installment than small diameter pipe lines

Answer 28

Per Ohm's law current flow is inversely proportional to total resistance large diameter pipe has a low resistance than small diameter pipe

Question 29

Cathodic despond meant can be avoided if the off-potentials are Below what level

Answer 29

-1.1 V (CSE)

Question 30

Which brownbag construction method will produce a small area for protection provide the least effective on the on the potential compared to remote earth

Answer 30

Close ground bed

Question 31

A plastic material loosely wrapped around a pipeline that blocks the effectiveness of the cathodic protection current is an example of which type of shielding

Answer 31

Insulating barrier

Question 32

A sort of pipeline casing on the pipeline Road crossing which blocks the effectiveness of the cathodic protection current is an example of which shielding

Answer 32

Metallic shielding

Question 33

It is a good idea to ensure that reinforcing wire in concrete be allowed to contact the underlying steel which is under cathodic protection to avoid shielding problems. T or F

Answer 33

False

Question 34

What is cathodic corrosion and give an example

Answer 34

Too much CP applied the alkalinity of the aluminum pipe may become sufficient to break down passive films

Question 35

Which type of cathodic protection system is most likely to cause stray current damage

Answer 35

Impressed

Question 36

Three primary criteria used for cathodic protection of underground or submerged steel piping

Answer 36

-850 mV with CP applied, -850 mV polarized, 100 mV polarization

Question 37

Which of the three criteria is the most widely used for steel structures

Answer 37

-850 mV CSE applied

Question 38

What is the native potential

Answer 38

Potential structure before CP is ever applied

Question 39

How can damage be avoided from hydrogen generated in the cathodic protection process

Answer 39

Avoid potential's more negative the -1.05 to -1.1 mV CSE polarized

Question 40

What is a polarized potential

Answer 40

Potential across the structure electrolyte interface that is the sum of the corrosion potential and the cathodic polarization

Question 41

How was polarized potential measured

Answer 41

Immediately after all current sources have been interrupted

Question 42

How to measure the formation of cathodic polarization for the 100 mV criteria

Answer 42

1. Measure the native potential, 2. Apply CP and allow structure the polarized. 3. Measure the polarized instant off potential. 4. Find the difference of the native and polarized potentials. 5. If greater than 100 mV, criteria is met

Question 43

Describes how to measure the decay of cathodic polarization for the 100 mV criteria

Answer 43

Measure the polarized potential (instant off). De-energize CP system and allow structure to depolarize. Measure the depolarize potential. Find the difference from the polarized and depolarized potentials. If greater than 100 mV, criteria is met

Question 44

Which of the following criteria can also be used on metal other than steel

Answer 44

The 100 mV polarization

Question 45

Why should the 100 mV polarization criteria not be used in areas where intergranular external SCC is suspected

Answer 45

Criteria my place the structure in the range for cracking which is between the native and the -850 mV CSE

Question 46

Which cathodic protection criteria requires the side drain procedure

Answer 46

Net protective current

Question 47

Which cathodic protection criteria are used for copper

Answer 47

The 100 mV polarization

Question 48

Which cathodic protection criteria are used for copper if it is electrically connected to steal

Answer 48

-850 mV CSE with CP applied and -850 mV CSE polarized potential

Question 49

Which cathodic protection criteria is most commonly used for well coated structures that can be cost prohibitive for poorly coated or bear structures

Answer 49

-850 mV CSC with CP applied

Question 50

Which cathodic protection criteria is measured directly after the interruption of all current sources

Answer 50

-850 mV CSE polarized potential

Question 51

According to the text which four criteria should not be utilized in areas of stray current activity

Answer 51

300 mV shift, E log I, 100 mV polarization, Net protective current