Explore topic-wise MCQs in Corrosion Engineering.

This section includes 13 Mcqs, each offering curated multiple-choice questions to sharpen your Corrosion Engineering knowledge and support exam preparation. Choose a topic below to get started.

1.

Which of the following is/are the preventions of stray current effect in an underground channel?

A. Use of bus conductor
B. Rearrangement of anodes
C. Use of bus conductor and rearrangement of anodes
D. Neither use of bus conductor nor rearrangements of anodes
Answer» D. Neither use of bus conductor nor rearrangements of anodes
Discussion
2.

Which of the following statements is/are correct about stray current?

A. It usually encountered in cathodic-protection systems
B. It refers to extraneous direct current in the earth
C. Acceleration corrosion will occur at the point where the current enters the soil
D. Stray current refers to extraneous direct current in the earth that usually encountered in cathodic protection systems and accelerated corrosion will occur at the point where current enters the soil
Answer» E.
Discussion
3.

Which of the following is an impressed current anode that is efficient in a marine environment?

A. Platinized titanium
B. Silicon-iron
C. Scrap steel
D. Graphite
Answer» B. Silicon-iron
Discussion
4.

Which of the following is/are the typical sacrificial anodes?

A. Magnesium only
B. Zinc and magnesium
C. Aluminum-tin only
D. Magnesium, Zinc, and aluminum-tin
Answer» E.
Discussion
5.

Which of the following reference electrode is used for cathodic-protection surveys?

A. Standard hydrogen electrode
B. Copper/copper sulfate reference electrode
C. Calomel electrode
D. Either calomel or standard hydrogen electrode
Answer» C. Calomel electrode
Discussion
6.

Which of the metallic structure will require more impressed current density for cathodic protection?

A. Water heaters in hot freshwater
B. Underground pipelines
C. The storage tank of H<sub>2</sub>SO<sub>4</sub>
D. Reinforcement rods
Answer» D. Reinforcement rods
Discussion
7.

Which of the following materials is/are used as backfill around the anode in impressed currents?

A. Coke breeze
B. Gypsum
C. Bentonite
D. Coke breeze, gypsum, and bentonite
Answer» E.
Discussion
8.

Which of the following material is/are used as an impressed-currents anode?

A. Graphite
B. Platinized titanium
C. Silicon-iron
D. Graphite, platinized titanium, and silicon-iron
Answer» E.
Discussion
9.

Which of the following terminal of the power supply should be connected to the metal to be protected?

A. Negative terminal
B. Positive terminal
C. Both positive and negative terminals
D. Either positive or negative terminal
Answer» B. Positive terminal
Discussion
10.

Which of the following is/are the types of cathodic protection?

A. External impressed current supply
B. Sacrificial anode
C. External impressed current supply and sacrificial anode
D. Neither external impressed current supply nor sacrificial anode
Answer» D. Neither external impressed current supply nor sacrificial anode
Discussion
11.

Which of the following cases in which the metal structure is protected?

A. Current passes from metal to electrolyte
B. Current enters it from the electrolyte
C. Electrical contact with dissimilar metals
D. Connecting the positive terminal of the power supply
Answer» C. Electrical contact with dissimilar metals
Discussion
12.

Cathodic protection is achieved by supplying electrons to the metal structure to be protected.

A. True
B. False
Answer» B. False
Discussion
13.

Which of the following is/are the common electrochemical reactions that occur during corrosion?

A. M==&gt;M<sup>+</sup>+ne
B. 2H<sup>+</sup>+2e=&gt;H<sub>2</sub>
C. O<sub>2</sub>+4H<sup>+</sup>+4e==&gt;H<sub>2</sub>O
D. M==&gt;M<sup>+</sup>+ne, 2H<sup>+</sup>+2e=&gt;H<sub>2</sub> and O<sub>2</sub>+4H<sup>+</sup>+4e==&gt;H<sub>2</sub>O
Answer» E.
Discussion