Electrometallurgy and Corrosion MCQ Questions and Answers

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

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Answer & Solution

Answer: Option D

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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

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Answer & Solution

Answer: Option D

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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

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Answer & Solution

Answer: Option C

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34

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

A) Pt B) Co C) None D) can't decide

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Answer & Solution

Answer: Option B

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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

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Answer & Solution

Answer: Option A

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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

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Answer & Solution

Answer: Option C

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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

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Answer & Solution

Answer: Option B

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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

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Answer & Solution

Answer: Option C

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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

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Answer & Solution

Answer: Option A

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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

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Answer & Solution

Answer: Option A

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Electrometallurgy and Corrosion MCQ Questions and Answers | Metallurgical Engineering