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Nace CP 1 > Day 2 Quiz > Flashcards

Day 2 Quiz Flashcards

1
Q

Cations are

A

Positively charged ions

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2
Q

Anions are

A

Negatively charged ions

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3
Q

Which of the following is true about an electro chemical corrosion cell

A. as polarization decreases current will decrease

B. as polarization increase current will decrease

C. as polarization increases there is no change in current

D. as polarization decreases there is a decrease in driving voltage

A

B

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4
Q

The weight of any material deposited on the cathode or released from the anode is

A. Directly proportional to the current

B. Directly proportional to the total resistance

C. Inversely proportional to the current

D. inversely proportional to resistance

A

A

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5
Q

Oxidation

A. increases the negative charge of an atom or compound

B. decreases the positive charge of an atom or compound

C. is independent of reduction

D. occurs when the electrons are lost from an atom or compound

A

D

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6
Q

Electro chemical corrosion requires

A. an anode

B. a cathode

C. an electrolyte

D. a metallic path

Choose all that apply

A

A
B
C
D

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7
Q

In an anodic process

A. positively charged ions leave the anode and enter the electrolyte

B. electrons flow through the electronic path from cathode to anode

C. negatively charged ions leave the anode and enter the electrolyte

D. positively charged ions leave the cathode and enter the electrolyte

A

A

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8
Q

Electrochemical reaction consists of

A. an oxidation half reaction

B. a reduction half reaction

C. ionic movement in the electrolyte

D. electron a movement in the metallic path

Choose all that apply

A

A
B
C
D

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9
Q

Resistance is measured in

A

Ohms

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10
Q

In a corrosion cell electrons flow in the direction of

A. anode to cathode through the electrolyte

B. anode to cathode through the metallic path

C. cathode to anode through the electrolyte

D. cathode to anode through the metallic path

A

B

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11
Q

Conventional current is in the direction of

A. anode to cathode through the electrolyte

B. anode to cathode through the metallic path

C. cathode to anode through the electrolyte

D. anode to cathode through the electronic path

A

A

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12
Q

The reduction reaction that occurs in electro chemical reaction

A. occurs at the anode

B. occurs at the cathode

C. involves the loss of electrons

D. involves a gain of electrons

Choose all that apply

A

B

D

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13
Q

In a galvanic series the more active metals

A. are more cathodic metals than Noble medals

B. will corrode if connected to a less active metals

C. will not corrode if connected to a less active metal

D. are generally resistant to corrosion

A

B

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14
Q

In a corrosion cell which of the following is not required

A. oxygen

B. cathode

C. Anode

D. electrolyte

A

A

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15
Q

The portion of the metal that is corroding is called the

A. cathode

B. anode

C. metallic path

D. insulated cable

A

B

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16
Q

At the anode in an electrochemical corrosion cell

A. electrons leave the anode and enter the electrolyte

B. positively charged ions leave the anode and enter the electrolyte

C. electrons leave the cathode and enter the electrolyte

D. negatively charged ions leave the anode and enter the electrolyte

A

B

17
Q

Reactions in the electrochemical corrosion cell consist of the following

A. oxidation

B. reduction

C. electron transfer through the electrolyte

D. Ion transfer through the electronic path

Choose all that apply

A

B

18
Q

In a galvanic series compared to noble metals the more active metals

A. are resistant to corrosion

B. Are cathodic to the noble metals

C. have a tendency to corrode more easily

D. have a less negative potential

A

C

19
Q

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

A. no external power is required

B. current can easily be adjusted

C. Are more suitable for high resistivity soil

D. has a high current capacity

A

A

20
Q

Compared to magnesium anodes zinc anodes tend to have a

A. Lower efficiency

B. Less negative open circuit potential

C. A higher current in higher resistivity soil

D. A lower life expectancy

A

B

21
Q

In an impressed current system

A. the rectifier negative terminal is connected to the anode

B. the rectifier positive terminal is connected to the anode

C. the rectifier positive terminal is connected to the structure

D. conventional current in the electrolyte goes from the structure to the anodes

A

B

22
Q

The quantity of polarization is determined by which of the following structure to electrolyte potentials

A. on

B. off

C. difference between on and off

D. difference between off and native

A

D

23
Q

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

A. aluminum

B. copper

C. steel

D. lead

A

C

24
Q

The criterion of -850 mV is reference to which electrode

A. calomel

B. copper copper sulfate

C. silver silver chloride

D. zinc

A

B

25
Q

A commonly used galvanic anode materials for steel is

A: chromium

B. graphite

C. mixed metal oxide

D. magnesium

A

D

26
Q

Galvanic anodes are generally used where

A. a large amount of current is required

B. soil resistivity is high

C. a small amount of current is required

D. control of current is required

A

C

27
Q

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

A. any metal in the galvanic series

B. only steel or cast-iron

C. reference to copper copper sulfate electrode

D. referenced to silver silver chloride electrode

Choose all that apply

A

B

C

28
Q

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

A polarization

B. polarized potential

C. IR drop

D. Cathode potential

A

C

29
Q

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

A. Increased temperature

B. Increased velocity of the electrolyte

C. Presence of sulfate reducing bacteria

D. Decreased oxygen

A

D

Nace CP 1 (4 decks)

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