BGAS Grade 2/3 Model Multiple Choice question & answers - Part 1

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1.  Corrosion is defined as :

a) Rusting of Cathode

b) Oxidation of iron in contact with water

c) Degradation of a material by chemical or electrochemical means

d) Break down of metal by hydrogen

 




2. What is an electrolyte?

a) It is a mixture of Salts and water

b) A substance which will conduct electricity and cause rusting

c) Oxidation liquid which will attack steel

d) A substance which will conduct a current and be broken down by it.

 

3. The degradation of material by chemical or electrochemical means is:

a) Pickling followed by passivation

b) Acid cleaning

c) Corrosion

d) An Electrolyte

 

4. Is the electrical circuit in a corrosion reaction?

a) AC

b) DC

c) Negative charge

d) Positive Charge

 

5. Hydrogen is evolved at

a) The anode at all times

b) The cathode at all times

c) The cathode as a by-product of the corrosion reaction

d) The anode as corrosion takes place

 

6. Positively charged area 

a) Anode

b) Cathode

c) Electrolyte

d) Electron

 

7. Negatively charged area

a) Anode

b) Cathode

c) Electrolyte

d) Electron

 

8. What are three elements needed for corrosion to occur?

a) Hydrogen, Oxygen, Water

b) Electron, Proton, Neutron

c) Anode, Cathode, Electrolyte

d) Temperature, Salt, Acid

 

9. Water will be drawn through the film and the resulting solution builds up a pressure under the film forced to form

a) Blister

b) Micron

c) Sulphates

d) Chloride

 

10. Hygroscopic blisters are called

a) Sulphates

b) Chlorides

c) Pinhead size water filled

d) Corrosion

 

11. Presence of oxygen into the Cathodic reaction the Number of Hydroxyl ions doubles

a) Sulphates

b) Double the corrosion rate

c) Pinhead size water filled

d) Corrosion not occur

 

12. Another name for the Galvanic List, is

a) The Corrosion list

b) Electro Negative List 

c) Electrical Corrosive properties series

d) Electro motive Forces Series

 

13. Two examples of hygroscopic salts would be

a) Iron phosphates and Iron Chromates

b) Iron Chordates and Iron Oxides

c) Iron Sulphates and Iron Chlorides

d) Iron Sulphates and Iron Silicates

 

14. If Zinc and Aluminium were in close contacts, in the presence or electrolyte

a) Aluminium would corrode

b) They would corrode equally

c) Zinc would corrode

d) None of the above

 

15. MEM’s are also known as

a) Moisture Enriched Materials

b) Metal Eating Microbes

c) Maximum Evolved Moistures

d) Material Electron Mobility

 

16. SRB’s are also known as

a) Salts Reducing Bacteria

b) Substrate Reducing Bacteria

c) Solid Reducing Bacteria

d) Sulphur Reducing Bacteria

 

17. The factors which can affect the rate corrosion are

a) Temperature, Time and Coating system

b) Bi-Metallic contact, Hygroscopic Salts and Bacteria

c) Coating system, Pipe diameter and Ultra Violet Light

d) Blasting Grades, Rust Grades and surface profile

 

18. The thickness of Mill scale is

a) 25 µm to 100 µm

b) 100 to 150 m

c) Zero

d) Dependent upon the material thickness

 

19. The three compressed oxides which from Mill scale are

a) Iron Oxide, Rust and Iron Sulphate

b) Wusite (FeO), Hematite (Fe3O4) and Magnetite (Fe2O3)

c) Iron sulphate, Iron Chloride and Iron Phosphate

d) RSC, RSJ and RSA

 

20. Name of sub atomic particles

a) Proton, Neutron, Electron

b) Micron, poron, Moron

c) Wusite, Hematite and Magnetite

d) Anode, Cathode, Electrolyte

 

21. Which of the following is the best noble metal?

a) Magnesium

b) Tungsten

c) Mill scale

d) Zinc

 

22. Which is cathode in corrosion?

a) Water

b) Oxygen

c) Substrate

d) Electrons released

 

23. Which one is more noble?

a) Silver

b) Steel

c) Magnesium

d) Zinc

 

24. Fe++ is ______________

a) An atom

b) Molecule

c) Iron Ion

d) Iron Substrate

 

25. Which one is not a compound in mill scale?

a) FeO

b) Fe2O3

c) Fe2 O4

d) Fe3O4

  

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