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Inspection 3.1u & 3.2u > Corrosion > Flashcards

Corrosion Flashcards

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1
Q
  1. A pre dive briefing should include:

a. Length of dive
b. Tide conditions
c. Inspection information and why
d. None of the above

A

C

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2
Q
  1. Which of the following methods for removing marine growth is the least detrimental to the surface of the structure.

a. Water jet
b. Pneumatic grinder
c. Hydraulic grinder
d. Needle gun

A

A

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3
Q
  1. The rate of the marine growth will increase if:

a. The water temperature rises
b. The depth of water is increased
c. The the depth of water is deacreased
d. None of the above

A

A

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4
Q
  1. The maximum water depth that pneumatic entrainment of abrasives can be efficiently be used is:

a. 3m
b. 30m
c. 50m
d. 120m

A

B

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5
Q
  1. For the ideal inspection programme on a production platform.

a. Close down the platform for a given period
b. Inspect known defects and possible defects
c. Do it as long as the money is available
d. Do as quickly as possible

A

B

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6
Q
  1. What’s the difference between hard and soft marine growth

a. The depth that it grows
b. Density of the growth
c. Rate of the growth
d. Colour of the growth

A

B

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7
Q
  1. Radiography in underwater inspection is:

a. Harmful
b. Never used
c. Requires access to both sides of the test piece
d. Is excellent for planar defect detection

A

C

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8
Q
  1. Marine growth is influenced by

a. Depth
b temperature
c. Both
d. Neither

A

C

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9
Q
  1. It’s necessary to establish a procedure covering the sections on inspection activity because:

a. Otherwise inspection itens will be overlooked
b. Equipment needs to be prepared in advanced
c. It will make it quicker
d. Logical procedures are essential prerequisite for efficient operations

A

D

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10
Q
  1. Corrosion can be defined as

a. Physical breakdown of material
b. Oxidation of material
c. Surface rust
d. Metal reverting to its original state

A

D

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11
Q
  1. The galvanic series in seawater is

a. A list of metal that’s corrode in seawater
b. A list of metal in order of increasing tendency to corrode in seawater
c. A list of noble and less noble metals
d. A list of metal that react with one another when placed in seawater

A

B

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12
Q
  1. The cathode is

a. Positive and protected
b. Negative and protected
c. Positive and corrodes
d. Negative and corrodes

A

A

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13
Q
  1. General corrosion differs from pitting corrosion because

a. There is always more general than pitting corrosion
b. Pitting corrosion is more significant
c. In general corrosion the anodic áreas shift around
d. General corrosion only occurs at depths below 20m

A

B

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14
Q
  1. The desired PH level to inhibit corrosion is:

a. 8
b. 10
c. 12
d. 14

A

D

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15
Q
  1. A brass bolt is fitted into an aluminium plate, what will be the result

a. It will remain secure as brass does not corrode
b. The brass will corrode and the bolt will fail
c. The aluminium will corrode
d. Both will corrode equally as they are in contact

A

C

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16
Q
  1. Marine growth may cause

a. Galvanic corrosion
b. Erosion corrosion
c. General corrosion
d. Crevice corrosion

A

D

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17
Q
  1. The rate of corrosion will be increased by

a. A rise in the ph level
b. Stagnation of the water
c. Increase in temperature
d. Increase in the amount of light

A

C

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18
Q
  1. Cathodic protection is described as

a. A series of sacrificial anodes placed on a structure
b. The establishment of a preferential corrosion cell sympathetic to the material to be protected
c. The application of an external current equal to or greater than all of the microscopic cell currents all the steel surface
d. The suppression of corrosion

A

B

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19
Q
  1. Sacrificial anodes may be made of

a. Zinc
b. Magnesium
c. Aluminium
d. All of the above

A

D

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20
Q
  1. With relation to the structure it is protecting a sacrificial anode should be

a. More noble
b. Well insulated
c. Less noble
d. Similar

A

C

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21
Q
  1. Impressed current anodes are energised up to

a. 240 volts AC, 13 amps
b. 90 volts DC, 340 amps
c. 80 volts DC, 1000 amps
d. 60 volts DC, 600 amps

A

C

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22
Q
  1. When cathodic protection is employed to prevent corrosion of a metal surface, that surface is

a. The anode
b. The cathode
c. Radioactive
d. None of the above

A

B

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23
Q
  1. Anodes in the impressed current system may be made of

a. Zinc
b. Magnesium
c. Aluminium
d. Niobium

A

D

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24
Q
  1. The negative terminal of the generator in a impressed current system should be attached to

a. The anode
b. The earth anchorage away from the structure
c. The insulated conductor
d. The structure

A

D

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25
25. Impressed current anodes should be switched off a. 6h in every 24h b. One week in a month c. Never d. When it may be a hazard
D
26
26. An inspection of a cathode protection system will be normally include the structure and a. Major pipelines up to 20m from its base b. All pipelines up to 200m from its base c. Nothing else d. Pipeline connections
A
27
27. A CP meter measures a. A corrosion that has taken place b. The wall thickness of the steel c. The potential to corrode d. Corrosion rate
C
28
28. The expected range of readings for unprotected steel in seawater is a. -500 to -600mV b. -800 to -900mV c. -450to -640mV d. -450 to -600mV
C
29
29. The potential reading of -100mV would indicate that material test was a. Heavily corroding steel b. Zinc/ magnesium anode c. Monel d. Silver
C
30
30. The stainless steel prods on a corrosion potential meter forms what part of the galvanic cell a. The anode b. The cathode c. The electrolyte d. The electrical path
D
31
31. For inspection dives with a CP meter a. Calibration is not required b. Calibration should be done before dive c. Calibration should be done after the dive d. Calibration should be done before and after the dive
D
32
32. A reading of -700mV on a steel structure would indicate a. The structure was adequately protected b. The meter was faulty c. The was inadequate local protection d. The structure was unprotected
C
33
33. When using a proximity meter the reference half cell should a. Be in direct contact with the structure b. Be at least 300mm from the steel structure c. Be as close as possible without making contact d. Never be used
C
34
34. Which of the following is considered to be the highest reading a. -600mV b. -700mV c. -650 mV d. -900mV
D
35
35. What’s used to measure the corrosion rate on a steel structure ? a. MPI b. A scan unit c. UT meter d. CP meter
D
36
36. The corrosion rate of steel will increase a. If the water temperature increases b. If the water temperature decreases c. Water temperature doesn’t affect the corrosion rate of steel d. If the water was freshwater
A
37
37. Corrosion will start if a. Ph is to high b. Ph is too low c. Metal is electrochemical environment d. If one metal is more noble than another
B
38
38. With reference to galvanic series which produces more electricity a. Silver and lead b. Copper and lead c. Copper and silver d. Silver and aluminium
D
39
39. Impressed current anodes can be made of a. Niobium and tungsten and lead b. Niobium and silver and lead c. Niobium and silver and aluminium d. Niobium and titanium
D
40
40. Impressed current anodes are used on platforms a. To increase the electrical flow b. To reduce the weight loading c. To use less power and maintenance d. To reduce the electrical flow
B
41
41. What method is used to determine internal corrosion a. CP meter b. MPI c. A scan presentation d. Visual inspection
C
42
2. Which of the following methods for removing marine growth is the least detrimental to the surface of the structure. a. Water jet b. Pneumatic grinder c. Hydraulic grinder d. Needle gun
A
43
3. The rate of the marine growth will increase if: a. The water temperature rises b. The depth of water is increased c. The the depth of water is deacreased d. None of the above
A
44
4. The maximum water depth that pneumatic entrainment of abrasives can be efficiently be used is: a. 3m b. 30m c. 50m d. 120m
B
45
5. For the ideal inspection programme on a production platform. a. Close down the platform for a given period b. Inspect known defects and possible defects c. Do it as long as the money is available d. Do as quickly as possible
B
46
6. What’s the difference between hard and soft marine growth a. The depth that it grows b. Density of the growth c. Rate of the growth d. Colour of the growth
B
47
7. Radiography in underwater inspection is: a. Harmful b. Never used c. Requires access to both sides of the test piece d. Is excellent for planar defect detection
C
48
8. Marine growth is influenced by a. Depth b temperature c. Both d. Neither
C
49
9. It’s necessary to establish a procedure covering the sections on inspection activity because: a. Otherwise inspection itens will be overlooked b. Equipment needs to be prepared in advanced c. It will make it quicker d. Logical procedures are essential prerequisite for efficient operations
D
50
10. Corrosion can be defined as a. Physical breakdown of material b. Oxidation of material c. Surface rust d. Metal reverting to its original state
D
51
11. The galvanic series in seawater is a. A list of metal that’s corrode in seawater b. A list of metal in order of increasing tendency to corrode in seawater c. A list of noble and less noble metals d. A list of metal that react with one another when placed in seawater
B
52
12. The cathode is a. Positive and protected b. Negative and protected c. Positive and corrodes d. Negative and corrodes
B
53
13. General corrosion differs from pitting corrosion because a. There is always more general than pitting corrosion b. Pitting corrosion is more significant c. In general corrosion the anodic áreas shift around d. General corrosion only occurs at depths below 20m
B
54
14. The desired PH level to inhibit corrosion is: a. 8 b. 10 c. 12 d. 14
D
55
15. A brass bolt is fitted into an aluminium plate, what will be the result a. It will remain secure as brass does not corrode b. The brass will corrode and the bolt will fail c. The aluminium will corrode d. Both will corrode equally as they are in contact
C
56
16. Marine growth may cause a. Galvanic corrosion b. Erosion corrosion c. General corrosion d. Crevice corrosion
D
57
17. The rate of corrosion will be increased by a. A rise in the ph level b. Stagnation of the water c. Increase in temperature d. Increase in the amount of light
C
58
18. Cathodic protection is described as a. A series of sacrificial anodes placed on a structure b. The establishment of a preferential corrosion cell sympathetic to the material to be protected c. The application of an external current equal to or greater than all of the microscopic cell currents all the steel surface d. The suppression of corrosion
B
59
19. Sacrificial anodes may be made of a. Zinc b. Magnesium c. Aluminium d. All of the above
D
60
20. With relation to the structure it is protecting a sacrificial anode should be a. More noble b. Well insulated c. Less noble d. Similar
C
61
21. Impressed current anodes are energised up to a. 240 volts AC, 13 amps b. 90 volts DC, 340 amps c. 80 volts DC, 750 amps d. 60 volts DC, 600 amps
D
62
22. When cathodic protection is employed to prevent corrosion of a metal surface, that surface is a. The anode b. The cathode c. Radioactive d. None of the above
B
63
23. Anodes in the impressed current system may be made of a. Zinc b. Magnesium c. Aluminium d. Niobium
D
64
24. The negative terminal of the generator in a impressed current system should be attached to a. The anode b. The earth anchorage away from the structure c. The insulated conductor d. The structure
D
65
25. Impressed current anodes should be switched off a. 6h in every 24h b. One week in a month c. Never d. When it may be a hazard
D
66
26. An inspection of a cathode protection system will be normally include the structure and a. Major pipelines up to 20m from its base b. All pipelines up to 200m from its base c. Nothing else d. Pipeline connections
A
67
27. A CP meter measures a. A corrosion that has taken place b. The wall thickness of the steel c. The potential to corrode d. Corrosion rate
C
68
28. The expected range of readings for unprotected steel in seawater is a. -500 to -600mV b. -800 to -900mV c. -400 to -650mV d. -450 to -600mV
C
69
29. The potential reading of -100mV would indicate that material test was a. Heavily corroding steel b. Zinc/ magnesium anode c. Monel d. Silver
C
70
30. The stainless steel prods on a corrosion potential meter forms what part of the galvanic cell a. The anode b. The cathode c. The electrolyte d. The electrical path
D
71
31. For inspection dives with a CP meter a. Calibration is not required b. Calibration should be done before dive c. Calibration should be done after the dive d. Calibration should be done before and after the dive
D
72
32. A reading of -700mV on a steel structure would indicate a. The structure was adequately protected b. The meter was faulty c. The was inadequate local protection d. The structure was unprotected
C
73
33. When using a proximity meter the reference half cell should a. Be in direct contact with the structure b. Be at least 300mm from the steel structure c. Be as close as possible without making contact d. Never be used
C
74
34. Which of the following is considered to be the highest reading a. -600mV b. -700mV c. -650 mV d. -900mV
D
75
35. What’s used to measure the corrosion rate on a steel structure ? a. MPI b. A scan unit c. UT meter d. CP meter
D
76
36. The corrosion rate of steel will increase a. If the water temperature increases b. If the water temperature decreases c. Water temperature doesn’t affect the corrosion rate of steel d. If the water was freshwater
A
77
37. Corrosion will start if a. Ph is to high b. Ph is too low c. Metal is electrochemical environment d. If one metal is more noble than another
B
78
38. With reference to galvanic series which produces more electricity a. Silver and lead b. Copper and lead c. Copper and silver d. Silver and aluminium
D
79
39. Impressed current anodes can be made of a. Niobium and tungsten and lead b. Niobium and silver and lead c. Niobium and silver and aluminium d. Niobium and titanium
D
80
40. Impressed current anodes are used on platforms a. To increase the electrical flow b. To reduce the weight loading c. To use less power and maintenance d. To reduce the electrical flow
B
81
41. What method is used to determine internal corrosion a. CP meter b. MPI c. A scan presentation d. Visual inspection
C

Inspection 3.1u & 3.2u (8 decks)

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