Electrometallurgy and Corrosion MCQ Questions and Answers | Metallurgical Engineering Page-6 section-1

51.
Which of the following metal does not resists the corrosion process?

A. Fe

B. Ni

C. Cu

D. Pb

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52.
For oxide layer to be protective, the Pilling Bedworth ratio should be

A. close to 1

B. less than 0.5

C. nearly 5

D. greater than 10

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53.
AI₂O₃ + 6H⁺ = 3H₂O + 2Al, ΔG° = 897.3 kJ, where hydrogen ion concentration is unity. The reaction potential of the above reaction under standard state will be

A. - 155 V

B. - 1.40 V

C. 1.65 V

D. 1.75 V

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54.
Match applications in Group 1 with the commonly used corrosion protection methods in Group 2.

Group 1 Group 2

P. Sea going vessel 1. Inorganic coating

Q. Undergrciund pipeline 2. Sacrificial anode

R. Electric traction tower 3. Aluminium paint

S. Electric poles 4. Impressed current

5. Galvanising

A. P-2, Q-4, R-5, S-3

B. P-2, Q-3, R-5, S-1

C. P-1, Q-2, R-5, S-4

D. P-4, Q-3, R-1, S-2

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55.
Match the following:

P. Sensitization 1. Phosphating

Q. Sacrificial anode 2. Anodic protection

R. Nickel plating 3. Cathodic protection

S. Conversion coating 4. Stainless steel

A. P-4, Q-3, R-2, S-1

B. P-1, Q-2, R-3, S-4

C. P-2, Q-3, R-4, S-1

D. P-3, Q-2, R-1, S-4

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56.
Displacement of metal stands for

A. A metal will displace from solution

B. The ions of a metal more noble than itself

C. Displacement increases with increased separation between metals in the series

D. All are correct

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57.
The following is employed as sacrificial anode to provide cathodic protection to ships, pipelines and storage tanks :

A. Iron

B. Copper

C. Nickel

D. Magnesium

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Group 1	Group 2
P. Sea going vessel	1. Inorganic coating
Q. Undergrciund pipeline	2. Sacrificial anode
R. Electric traction tower	3. Aluminium paint
S. Electric poles	4. Impressed current
	5. Galvanising

P. Sensitization	1. Phosphating
Q. Sacrificial anode	2. Anodic protection
R. Nickel plating	3. Cathodic protection
S. Conversion coating	4. Stainless steel

Electrometallurgy and Corrosion MCQ Questions and Answers | Metallurgical Engineering

51. Which of the following metal does not resists the corrosion process?

Answer & Solution

52. For oxide layer to be protective, the Pilling Bedworth ratio should be

Answer & Solution

53. AI2O3 + 6H+ = 3H2O + 2Al, ΔG° = 897.3 kJ, where hydrogen ion concentration is unity. The reaction potential of the above reaction under standard state will be

Answer & Solution

Answer & Solution

55. Match the following: P. Sensitization 1. Phosphating Q. Sacrificial anode 2. Anodic protection R. Nickel plating 3. Cathodic protection S. Conversion coating 4. Stainless steel

Answer & Solution

56. Displacement of metal stands for

Answer & Solution

57. The following is employed as sacrificial anode to provide cathodic protection to ships, pipelines and storage tanks :

Answer & Solution

51.
Which of the following metal does not resists the corrosion process?

52.
For oxide layer to be protective, the Pilling Bedworth ratio should be

53.
AI₂O₃ + 6H⁺ = 3H₂O + 2Al, ΔG° = 897.3 kJ, where hydrogen ion concentration is unity. The reaction potential of the above reaction under standard state will be

55.
Match the following:

P. Sensitization 1. Phosphating

Q. Sacrificial anode 2. Anodic protection

R. Nickel plating 3. Cathodic protection

S. Conversion coating 4. Stainless steel

56.
Displacement of metal stands for

57.
The following is employed as sacrificial anode to provide cathodic protection to ships, pipelines and storage tanks :