Modern Theory Principles and Applications MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Modern Theory Principles and Applications, a fundamental topic in the field of Corrosion Engineering. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Modern Theory Principles and Applications MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Modern Theory Principles and Applications mcq questions that explore various aspects of Modern Theory Principles and Applications problems. Each MCQ is crafted to challenge your understanding of Modern Theory Principles and Applications principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Corrosion Engineering tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Modern Theory Principles and Applications MCQs are your pathway to success in mastering this essential Corrosion Engineering topic.

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Modern Theory Principles and Applications MCQs | Page 2 of 9

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Q11.
An electrochemical reaction is always a combination of oxidation half-cell and a reduction of half-cell.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (a).True
Q12.
What is the cathodic and anodic reactions respectively of Cu-Ag system?

a.

Ag ==> Ag⁺² + 2e and Cu⁺² + 2e ==> Cu

b.

Cu ==> Cu⁺² + 2e and Ag ==> Ag⁺² + 2e

c.

2Ag⁺¹ + 2e ==> 2Ag and Cu ==> Cu⁺² + 2e

d.

2Ag ==> 2Ag⁺¹ + 2e and Cu⁺² + 2e ==> Cu

Discuss
Answer: (c).2Ag⁺¹ + 2e ==> 2Ag and Cu ==> Cu⁺² + 2e
Q13.
Which of the following diagrams shows the stability of metals over a range of pH and potential of a system?

a.

Phase diagrams

b.

Pourbaix diagrams

c.

Phase diagrams and Pourbaix diagrams

d.

Colling curves

Discuss
Answer: (b).Pourbaix diagrams
Q14.
Which of the following is/are the applications of Pourbaix diagrams?

a.

Predicting the spontaneous direction of reactions

b.

To reduce corrosion attack

c.

To reduce corrosion attack, to predict the direction of spontaneous reaction and to estimate the composition of corrosion product

d.

To estimate the composition of corrosion product

Discuss
Answer: (c).To reduce corrosion attack, to predict the direction of spontaneous reaction and to estimate the composition of corrosion product
Q15.
Which of the following is/are the limitations of Pourbaix diagrams?

a.

Rate of reaction is can’t be predicted

b.

It neglects the impurities of working conditions

c.

Stability of metallic species is predicted

d.

Rate of reaction is not predicted and it neglects the impurities of working conditions

Discuss
Answer: (d).Rate of reaction is not predicted and it neglects the impurities of working conditions
Q16.
What is meant by an anode?

a.

An electrode at which reduction process takes place

b.

An electrode at which oxidation process takes place

c.

An electrode at which neither the oxidation nor reduction takes place

d.

An electrode at which both oxidation and reduction takes place

Discuss
Answer: (b).An electrode at which oxidation process takes place
Q17.
Which of the following is correct regarding Polarization?

a.

It is the deviation from equilibrium potential

b.

It results from the change in net current flow

c.

Magnitude is measured in terms of overvoltage

d.

It is the deviation from equilibrium potential that occurred due to the change in net current flow and its magnitude is measured in terms of overvoltage

Discuss
Answer: (d).It is the deviation from equilibrium potential that occurred due to the change in net current flow and its magnitude is measured in terms of overvoltage
Q18.
What is the symbol of overvoltage?

a.

Alpha (α)

b.

Beta (β)

c.

Eta (η)

d.

Delta (Δ)

Discuss
Answer: (c).Eta (η)
Q19.
Exchange current density is the current per unit area of either oxidation or reduction process at the equilibrium.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (a).True
Q20.
What is the formula to calculate rate of oxidation or rate of reduction during equilibrium?

a.

r₀=rʀ=i₀nF

b.

r₀=rʀ=i₀/nF

c.

r₀=rʀ=i₀n/F

d.

r₀=rʀ=nF/i₀

Discuss
Answer: (b).r₀=rʀ=i₀/nF
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