Examstudypoints

 Q 1. Dry corrosion is also called as *

a) Immersed Corrosion

b) Electrochemical corrosion

c) Wet corrosion

d) None of these

Q 2. In the case bent pipe the corrosion takes place is_________ *

a) Corrosion by Oxygen

b) concentration cell corrosion

c) galvanic cell corrosion

d) None of the above

Q 3. Larger the area of anode compared to cathode will lead to *

Slower corrosion

Faster corrosion

Corrosion remains constant

None of the above

Q 4. Voltaic cells generate electricity by *

spontaneous redox reaction

non spontaneous redox reaction

sublimation reaction

thermochemical reaction

Q 5.Dangerous form of the corrosion amongst the following is *

a) Pitting corrosion

b) Soil corrosion

c) Water line corrosion

d) Galvanic corrosion

Q 6.In the case of impressed current method DC is applied _____ *

In the direction direction of corrosion current

In the opposite detection of corrosion current

Cant say

None of these

Q 7.. Highly oxygenated part becomes --------whereas less oxygenated part becomes -------- in the corrosion. *

Anode, cathode

Cathode, anode

Anode, Anode

Cathode, cathode

Q 8. Which of the following is an example of corrosion? *

a) Rusting of iron

b) Tarnishing of silver

c) Liquefaction of ammonia

d) Rusting of iron and tarnishing of silver

Q 9. Which of the following is the most stable state of metal? *

a) Ore of metal

b) Pure metal

c) Corroded metal

d) Metal ion

Q 10 Higher is the impurities in the metal, is the rate of corrosion. *

a) faster

b) slower

c) moderate

d) slowest

Q 11. Select the incorrect statement from the following option. *

a) Replacement of corroded equipment is time-consuming

b) Corrosion causes contamination of product

c) Corrosion increases the electrical conductivity of metals

d) Corrosion causes leakage of toxic liquid or gases

Q 12. Leakage of inflammable gas from a corroded pipe can cause ___________ *

a) Acidity

b) Alkalinity

c) Turbidity

d) Fire hazards

Q 13. Sherardizing means diffusion of ______ in the base metal. *

a. Cr

b. Zn

c. Al

d. all of the above

Q 14.In the electroplating of copper electrolyte should be used is *

a. CuSO4

b. CuCl2

c. NiCl4

d. Both a and b

Q 15. What is/ are the application of metal cladding? *

a. Aircraft industry

b. electrical industry

c. both a and b

d. none of the above

Q 16. out of the following metals which doesn't show active passive behavior *

a. Fe

b. Al

c. Ti

d. Ni

Q17. If one ship is sailing is standing in water for a very log duration , which part will corrode first? *

a) part which is immersed in water

B) part which is above the water

C) whole ship will corrode

D) ship will not corrode

Q18. Which of the following metal is used as a sacrificial anode? *

a) Zinc

b) Copper

c) Silver

d) Gold

Q19. Which method uses the diffusion technique of a coating to form the protective layer? *

a. Electroplating

b. Hot dipping

c. Metal cladding

d. Cementation

Q20. The alkali and alkaline earth metals l forms oxide film. *

a. Porous

b. Nonporous

c. Unstable

d. Volatile

Q21. The process of galvanizing is ------------ *

a. Coating of iron on Zn

b. Coating of Sn on iron

c. Coating of iron On tin

d. None of these

Q22.If the coating metal is lower placed in galvanic series than the base metal, then the coating is *

a. Cathodic coating

b. Anodic coating

c. Hot dipping

d. Electroless coating

Q23.If the metal or alloy is of larger (grain size), then the rate of corrosion is --------- *

a. Increases

b. Decreases

c. Remains constant

d. None of these

Q24. If the Ratio of P. B.R is greater than then type of oxide is *

Protective

Non Protective

Unstable

Volatile

Q25.Al Corrodes minimum at *

11

5.5

9

6.5

Back

Submit

Never submit passwords through Google Forms.

This content is neither created nor endorsed by Google. Report Abuse - Terms of Service - Privacy Policy

 Forms