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Multiple Choice Questions on Forms of Corrosion |
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| Questions 1 - 5 |
Page 1 of 4 |
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1. |
The best way to prevent attack by uniform corrosion is to |
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coat the equipment |
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select the most expensive material for fabrication |
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apply cathodic protection wherever necessary |
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keep a corrosion allowance |
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2. |
When zinc is coupled to steel and corrosion is tested in various environments, which one of the following happens? |
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The corrosion rate of steel increases while that of zinc is decreased |
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The corrosion rate of zinc is increased while that of steel is decreased |
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| The corrosion rates of both decrease | ||
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The corrosion rates of both increase |
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3. |
Steel plates with aluminum rivet are exposed to seawater for ten weeks. What would happen to aluminum rivets? |
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The rivets would corrode |
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corrosion is partially eliminated |
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The steel plates would corrode |
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Both would corrode |
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4. |
Two dissimilar metals of equal area that are in contact are to be coated but enough coating is on hand with half of the total area. For maximum corrosion protection, which one of the following must be coated? |
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Half of the anode and half of the cathode |
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Only the cathode |
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Only the anode |
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Both anode and cathode |
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5. |
An uncoated pipeline lies in a trench in a undisturbed soil and is covered by a backfill. Would this pipe be subjected to localized corrosion? |
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Yes, aeration cells with high and low oxygen contents would be formed |
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No, the backfill would not allow the pipe to corrode |
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Dry moisture/wet moisture cells would be immediately formed |
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No differential aeration cells can be formed until the soil is disturbed |
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