Electrometallurgy and Corrosion MCQ Questions and Answers | Metallurgical Engineering Page-4 section-1

31.
From the list given below:
P. Cu
Q. Mg
R. Ni
S. Zn
Two metals which provide cathode protection to steel are:

A. P, R

B. R, S

C. Q, R

D. Q, S

Answer & Solution Discuss in Board Save for Later

32.
Which metals shows P-B ratio greater than 2

A. Fe: 2.16, W: 3.40 & V: 3.18

B. U: 3.05, Mo: 3.4 & Cb: 2.61

C. Si: 2.27, Ta: 2.33 & Sb: 2.35

D. All are correct

Answer & Solution Discuss in Board Save for Later

33.
Physical barriers to corrosion may be applied in the form of coating and films when

A. velocity can't be change

B. temperature can't be change

C. both A and B

D. none of these

Answer & Solution Discuss in Board Save for Later

34.
When Pt and Co are electrically connected, which one gets corroded

A. Pt

B. Co

C. None

D. can't decide

Answer & Solution Discuss in Board Save for Later

35.
Match the principle given in Group I with corresponding corrosion terminology in Group II.

Group I Group II

P. Electrode polarization 1. Dezincification

Q. Passivity 2. Intergranular attack

R. Selective leaching 3. Over voltage

S. Grain boundary precipitation 4. Surface oxide film

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

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

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

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

Answer & Solution Discuss in Board Save for Later

36.
Which of the following is/are the methods for surface preparation for coating application?

A. Sandblasting and chipping

B. Wire brushing and flame cleaning

C. Sandblasting, chipping, wire brushing and flame cleaning

D. Sandblasting, chipping and flame cleaning

Answer & Solution Discuss in Board Save for Later

37.
Which metals/alloys passivates spontaneously in acid solutions containing oxidizers or dissolved oxygen?

A. Copper

B. titanium

C. stainless steel and titanium

D. nickel

Answer & Solution Discuss in Board Save for Later

38.
The Faraday's laws of electrolysis are related to the

A. atomic number of the cation

B. atomic number of the anion

C. equivalent mass of the electrolyte

D. speed of the cation

Answer & Solution Discuss in Board Save for Later

39.
The cathode in an electrochemical cell always carries

A. negative charge

B. positive charge

C. zero charge

D. positive or negative charge depending upon the nature of the cell

Answer & Solution Discuss in Board Save for Later

40.
Two electrolytic cells with CuSO₄ and AgNO₃ solutions are connected in series to a power source. If after 10 minutes the weight of copper (atomic weight 63.5) deposited in the first cell is 63.5 gms, the corrosponding weight of silver (atomic weight 108) deposited in the second cell is . . . . . . . . gms.

A. 108

B. 54

C. 216

D. 81

Answer & Solution Discuss in Board Save for Later

Group I	Group II
P. Electrode polarization	1. Dezincification
Q. Passivity	2. Intergranular attack
R. Selective leaching	3. Over voltage
S. Grain boundary precipitation	4. Surface oxide film

Electrometallurgy and Corrosion MCQ Questions and Answers | Metallurgical Engineering

31. From the list given below: P. Cu Q. Mg R. Ni S. Zn Two metals which provide cathode protection to steel are:

Answer & Solution

32. Which metals shows P-B ratio greater than 2

Answer & Solution

33. Physical barriers to corrosion may be applied in the form of coating and films when

Answer & Solution

34. When Pt and Co are electrically connected, which one gets corroded

Answer & Solution

35. Match the principle given in Group I with corresponding corrosion terminology in Group II. Group I Group II P. Electrode polarization 1. Dezincification Q. Passivity 2. Intergranular attack R. Selective leaching 3. Over voltage S. Grain boundary precipitation 4. Surface oxide film

Answer & Solution

36. Which of the following is/are the methods for surface preparation for coating application?

Answer & Solution

37. Which metals/alloys passivates spontaneously in acid solutions containing oxidizers or dissolved oxygen?

Answer & Solution

38. The Faraday's laws of electrolysis are related to the

Answer & Solution

39. The cathode in an electrochemical cell always carries

Answer & Solution

Answer & Solution

31.
From the list given below:
P. Cu
Q. Mg
R. Ni
S. Zn
Two metals which provide cathode protection to steel are:

32.
Which metals shows P-B ratio greater than 2

33.
Physical barriers to corrosion may be applied in the form of coating and films when

34.
When Pt and Co are electrically connected, which one gets corroded

35.
Match the principle given in Group I with corresponding corrosion terminology in Group II.

Group I Group II

P. Electrode polarization 1. Dezincification

Q. Passivity 2. Intergranular attack

R. Selective leaching 3. Over voltage

S. Grain boundary precipitation 4. Surface oxide film

36.
Which of the following is/are the methods for surface preparation for coating application?

37.
Which metals/alloys passivates spontaneously in acid solutions containing oxidizers or dissolved oxygen?

38.
The Faraday's laws of electrolysis are related to the

39.
The cathode in an electrochemical cell always carries