Waste Water Treatment - T09

MCQ in Waste Water Treatment Corrosion control measures (1-15Qs) YouTube Link : https://www.youtube.com/watch?v=wRPlBjKFc1I

30 flashcards · Other · by shankaresh

1. As compare to iron, aluminum has a) higher tendency to oxidize b) less tendency to oxidize c) equal tendency to oxidize d) all of above

   a) higher tendency to oxidize

2. In ______ , a more reactive metal coating reacts instead of the metal below it a) applying a coating that acts as a barrier b) sacrificial protection c) protects the metal from further corrosion d) iron will not rust

   b) sacrificial protection

3. For example, _________ (the iron is coated with a layer of zinc) a) does not react with water b) zinc is used to galvanise iron c) forms an oxide coating d) stops the metal reacting with air or water

   b) zinc is used to galvanise iron

4. In galvanised iron the zinc reacts instead of the iron and therefore the ______ a) protects the metal from further corrosion b) coating itself reacts instead of the metal c) corrosion can be prevented d) iron will not rust

   d) iron will not rust

5. ________ if oxygen and water are present a) iron will only rust b) greasing the metal c) electroplating d) rusting

   a) iron will only rust

6. These chemical reactions between the material and substances in the environment ________ a) lead to the destruction of the materials b) painting the metal c) more reactive metal d) rusting

   a) lead to the destruction of the materials

7. Some materials can be _______ (e.g. by reacting with oxygen or water) a) corroded b) reacts instead of the iron c) rusting d) applying a coating that acts as a barrier

   a) corroded

8. Some ________ (such as water or the air) a) iron will only rust b) aluminium does not need to be coated c) materials chemically react with substances in the environment d) sacrificial protection

   c) materials chemically react with substances in the environment

9. Iron will only rust, if ______ a) protects the metal from further corrosion b) oxygen and water are present c) reacts instead of the iron d) greasing the metal

   b)oxygen and water are present

10. Oxygen and water vapour are both _______ a) aluminium forms its own oxide coating b) found in the air c) aluminium does not need to be coated d) electroplating

    b) found in the air

11. If oxygen (found in the air) is not present, _______ a) iron will not rust b) lead to the destruction of the materials c) reacts instead of the iron d) coating itself reacts instead of the metal

    a) iron will not rust

12. __________ by applying a coating that acts as a barrier a) rusting b) zinc is used to galvanise iron c) corrosion can be prevented d) does not react with water

    c) corrosion can be prevented

13. __________ that protects it from further corrosion a) electroplating b) aluminium forms its own oxide coating c) corrosion d) does not react with water

    b) aluminium forms its own oxide coating

14. Corrosion can be prevented by ____________ (although if the pain chips, rusting will still occur) a) painting the metal b) more reactive metal c) forms an oxide coating d) coating itself reacts instead of the metal

    a) painting the metal

15. Factor influencing corrosion are __________ a)Diffusion b)Temperature c)Conductivity d)All the above

    d)All the above

16. The rate of corrosion can be controlled or reduced by applying ____________ a)Anti-Corrosion Coating b)Acid Treatment c)Sea Water Injection d)None of these

    a)Anti-Corrosion Coating

17. Corrosion protection techniques includes ____________ a)Metal repair putties b)Composite repair components c)Both A&B d) Electrochemical potential

    c)Both A&B

18. Diffusion rates are controlled by___________ a)Conductivity b)Ions types c)Temperature d)Acidity

    c)Temperature

19. PH is a measure of _______ a)water level b)Ions c)Acidity/Alkalinity d)Electrochemical potential

    c)Acidity/Alkalinity

20. Corrosion will not occur in distilled water and the rate of corrosion will be a)Decrease as the conductivity ,Increase due to presence of ions b)Increase as the conductivity ,Increase due to presence of ions c)Decrease as the conductivity ,Decrease due to presence of ions d)Increase as the conductivity ,Decrease due to presence of ions

    b)Increase as the conductivity ,Increase due to presence of ions

21. PH is around 7.5 which mean that the hydrogen ion is ____________ a)Neutral b)Acid c)Base d)None of these

    b)Acid

22. PH 7 is ______________ a)Neutral b)Acid c)Base d)None of these

    a)Neutral

23. The excess hydrogen ions can become involved in the balancing of cathodic reaction which results in the evolution of ________________ a)Nitrogen gas b)Hydrogen gas c)Crude gas d)Hydroxyl gas

    b)Hydrogen gas

24. SCE stands for _______________ a)Saturated Calomel Electrode b)Saturated Carbonate Electrode c)Saturated Chloride Element d)Saturated Cathodic Element

    a)Saturated Calomel Electrode

25. LSI stands for ________________ a)Langelier Soluble Ion b)Langelier Saturation Index c)Langelier Stability Index d) None of these

    b)Langelier Saturation Index

26. Reducing the PH by ________ Unit will bring the water into equilibrium. a)4 b)2 c)3 d)1

    d)1

27. Scale can form and CaCo3 precipitation may occur only ___________ a)if LSI is Zero b) if LSI is positive c)if LSI is Negative d)None of these

    b) if LSI is positive

28. If LSI is close to Zero _______ a)Changes in water quality b)Changes in Temperature c)Evaporation could change the Index d)All the above

    d)All the above

29. If LSI is Negative ________ a)Scale can Form b)Borderline scale potential c)No potential to scale d)All the above

    c)No potential to scale

30. LSI = _______ a)pH - pHs b)pH +pHs c)pH - pH5 d)pH-pH2

    a)pH - pHs