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 6 of 9

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Q51.
Which of the following electrochemical methods is/are used to determine the corrosion rate?

a.

Tafel extrapolation

b.

Linear polarization

c.

Tafel extrapolation and linear polarization

d.

Neither Tafel extrapolation nor linear polarization

Discuss
Answer: (c).Tafel extrapolation and linear polarization
Q52.
The applied current cathodic polarization curve of a corroding metal is non-linear at low currents, but it becomes linear at higher currents on a semilogarithmic plot.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (b).False
Q53.
Which of the following is/are the advantages of Tafel extrapolation?

a.

It can measure extremely low corrosion rates

b.

It can be used for continuously monitoring the corrosion rate of a system

c.

It can be used for continuously monitoring the corrosion rate of a system with high accuracy and measures extremely low corrosion rates

d.

It can be performed rapidly with high accuracy

Discuss
Answer: (c).It can be used for continuously monitoring the corrosion rate of a system with high accuracy and measures extremely low corrosion rates
Q54.
Which of the following is/are the limitations of Tafel extrapolation?

a.

For reasonable accuracy, the Tafel region must be extended

b.

It can be applied to systems containing one reduction process only

c.

Much interference from concentration polarization

d.

It can be applied to systems containing one reduction process, for reasonable accuracy the Tafel region must be extended and there will be much interference from concentration polarization

Discuss
Answer: (d).It can be applied to systems containing one reduction process, for reasonable accuracy the Tafel region must be extended and there will be much interference from concentration polarization
Q55.
What is the range of current density around corrosion potential that will observe that the applied current density is a linear function of the electrode potential?

a.

10 mV more noble or active around corrosion potential

b.

5 mV more noble or active around corrosion potential

c.

10 V more noble or active around corrosion potential

d.

5 V more noble or active around corrosion potential

Discuss
Answer: (a).10 mV more noble or active around corrosion potential
Q56.
What is the formula to determine the slope of linear polarization curve?

a.

ΔE/Δi =[2.3*icorr*(βa+βb)]/[βa*βb]

b.

ΔE/Δi=[βa+βb]/[2.3*icorr*(βa*βb)]

c.

ΔE/Δi=[βa*βb]/[2.3*icorr*(βa+βb)]

d.

ΔE/Δi=[2.3*icorr*(βa*βb)]/[βa+βb]

Discuss
Answer: (c).ΔE/Δi=[βa*βb]/[2.3*icorr*(βa+βb)]
Q57.
Which of the following industries uses Tafel extrapolation or linear polarization to measure low corrosion rates?

a.

Nuclear industries

b.

Pharmaceutical industries

c.

Food processing industries

d.

Nuclear, pharmaceutical and food processing industries

Discuss
Answer: (d).Nuclear, pharmaceutical and food processing industries
Q58.
Which of the following is/are correct regarding the given figure?

a.

It is a reversible cell with unit activity

b.

Copper and zinc are cathode and anode respectively

c.

It is a reversible cell of Cu-Zn system with standard cell potential of 1.10V, copper and zinc are cathode and anode respectively

d.

The standard cell potential is 1.10V

Discuss
Answer: (c).It is a reversible cell of Cu-Zn system with standard cell potential of 1.10V, copper and zinc are cathode and anode respectively
Q59.
What are the cathodic and anodic reactions respectively of a given Cu-Zn system?

a.

Cu ==> Cu⁺² + 2e and Zn⁺² + 2e ==> Zn

b.

Cu⁺² + 2e ==> Cu and Zn ==> Zn⁺² + 2e

c.

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

d.

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

Discuss
Answer: (b).Cu⁺² + 2e ==> Cu and Zn ==> Zn⁺² + 2e
Q60.
What is the overall standard cell potential of a given Cu-Fe system?

a.

+0.78V

b.

-0.14V

c.

-0.78V

d.

+0.14

Discuss
Answer: (a).+0.78V
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