CSWIP EXAM UPDATED ACTUAL QUESTIONS AND CORRECT ANSWERS

CSWIP EXAM UPDATED ACTUAL QUESTIONS AND
CORRECT ANSWERS

Question:
1. corrosion can best be defined as:
Answer:
a physical breakdown of a material b oxidation of materials c surface rust D METAL REVERTING TO
ITS ORIGINAL STATE

Question:
2. the galvanic series in seawater is:
Answer:
a a list of metals that corrode in seawater B A LIST OF METALS IN ORDER OF INCREASING
TENDENCY TO CORRODE IN SEAWATER c a list of noble and less noble metals d a list of metals that
react with one another when placed in seawater

Question:
3. the cathode is:
Answer:
A POSITIVE AND PROTECTED b negative and protected c positive and corrodes d negative and
corrodes

Question:
4. general corrosion differs from pitting corroision because:
Answer:
a there is always more general pitting corrosion B PITTING CORROSION IS MORE SIGNIFICANT c in
general corrision on the anodic areas shift around d general corrosion only occurs at depths below 20m

Question:
5. the desired pH level to inhibit corrosion is:
Answer:
a 8 b 10 c 12 D 14

Question:
6. a brass bolt is fitted into an aluminium plate, what will be the result:
Answer:
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

Question:
7. marine growth may cause:
Answer:
a galvanic corrosion b erosion corrosion c general corrosion D CREVICE CORROSION

,Question:
8. the rate of corrosion will be increased by:
Answer:
a a rise in the pH level b stagnation of the water C INCREASE IN TEMPERATURE d increase in the
amount of light

Question:
9. cathodic protection is described as:
Answer:
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 at the steel surface d the
suppression of corrosion

Question:
10. sacrificial anodes may be made of:
Answer:
a zinc b magnesium c aluminium D ALL OF THE ABOVE

Question:
11. with relation to the structure it is protecting, a sacrificial anode should be:
Answer:
a more noble b well insulated C LESS NOBLE d similar

Question:
12. impressed current anodes are energised up to:
Answer:
a 240 volts AC, 13 amps b 90 volts DC, 340 amps c 80 volts DC, 750 amps D 60 volts DC, 600 amps

Question:
13. when cathodic protection is employed to prevent corrosion of a metal surface that surface is:
Answer:
a the anode B THE CATHODE c radioactive d none of the above

Question:
14. anodes in the impressed current system may be made of:
Answer:
a zinc b magnesium c aluminium D NIOBIUM

Question:
15. the negative terminal of the generator in an impressed current system should be attached to:
Answer:
a the anode b the earth anchorage away from the structure c the insulated conductor D the structure

Question:
16. impressed current anodes should be switched off:

, Answer:
a 6 hours in every 24 hours b one week in a month c never D when it may be a hazard

Question:
17. an inspection of a cathode protection system will normally include the structure and:
Answer:
A major pipelines up to 20m from its base b all pipelines up to 200m from its base c nothing else d pipeline
connections

Question:
18. a CP meter measures:
Answer:
a the corrosion that has taken place b the wall thickness of the steel C the potential to corrode d the
corrosion rate

Question:
19. the expected range of readings for unprotected steel in seawater is:
Answer:
a -500 to -600 mV b -800 to -900 mV C -400 to -650 mV d -450 to -600 mV

Question:
20. a potential reading of -100 mV would indicate that the material under test was:
Answer:
a heavily corroding steel b zinc / magnesuim anode C monel d silver

Question:
21. the stainless steel prod on a corrosion potential meter forms what part of the galvanic cell:
Answer:
a the anode b the cathode c the electrolyte D the electrical path

Question:
22. for inspection dives with a CP meter:
Answer:
a calibration is not required b calibration should be done before the dive c calibration should be done after
the dive D calibration should be done before and after the dive

Question:
23. a reading of -700 mV on a steel structure would indicate:
Answer:
a the structure was adequately protected b the meter was faulty C there was inadequate local protection d
the structure was unprotected

Question:
24. when using a proximity meter the reference half cell should:
Answer:
a be in direct contact with the structure b be at least 300mm from the steel surface C be as close as possible
without making contact d never be used