Question 2:

Pitting failure can occur anywhere in the boiler, particularly in economizers, superheaters, reheaters, and the nonheated portions of water wall tubes. One of the methods used to control pitting in boilers is to:

A - Blanket the boiler with oxygen during shutdown periods B - Keep the boiler full of chemically treated water C - Ensure that the deaerator is operated to effectively add oxygen to the feed water D - Eliminate the residual of oxygen scavenger chemicals in the boiler water Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________

Question 3:

Cathodic protection is the use of indirect current from an external source to oppose the discharge of corrosion current from cathodic areas of a metal structure immersed in a conducting medium or electrolyte such as soil and water.

A - True B - False Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________

Question 4:

Pitting in boiler metal is caused by:

A - Carbon dioxide B - Chlorides C - Oxygen D - Ammonia Correctness Rule: Single Correct Answer Required Answer(s) Given: C Correct Answer(s): C Marked as: Correct _______________________________________________

Question 5:

Based on the galvanic series chart shown, which combinations of metals listed would have the least tendency for galvanic corrosion when joined?

A - Gold and tin B - Nickel and Monel C - Nickel and zinc D - Steel and magnesium Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________

Question 6:

Acidic water is commonly neutralized with:

A - Amines and nitrates B - Lime and soda ash C - Chlorides or sulphates D - Magnesium or gypsum Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________

Question 7:

Impressed current systems are commonly used where large currents are required. Direct current is discharged through one or more anodes into the:

A - Thermoelectric generators B - Electrolyte C - Low resistance backfill D - Structure requiring protection Correctness Rule: Single Correct Answer Required Correct Answer(s): D Marked as: Incorrect _______________________________________________

Question 8:

Sacrificial anodes are made of materials like:

A - Zinc or magnesium B - Nickel or chromium C - Copper or aluminum D - Graphite or titanium Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 9:

Cathodic protection current must be:

A - Stray current B - Direct current C - Alternating current D - Indirect current Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________

Question 10:

Of the following, which is NOT a typical application of galvanic anodes?

A - External protection of vessels that are partly filled with water B - Protection of short, well-coated buried pipelines C - Hot spot (small areas of high corrosion) protection on bare buried pipelines. D - Internal protection of vessels that are partly filled with water Correctness Rule: Single Correct Answer Required Correct Answer(s): A Marked as: Incorrect Question 1:

Passivating inhibitors function by:

A - Being added to a system to neutralize acids B - Being electrodeposited onto mechanical parts C - Forming precipitates on cathodic areas, which slow down the corrosion reactions D - Causing the metal to corrode, creating a protective oxide film Correctness Rule: Single Correct Answer Required Answer(s) Given: D Correct Answer(s): D Marked as: Correct _______________________________________________

Question 2:

Cathodic protection can only be applied to the surface of the metal exposed to the:

A - Anodic areas of the structure B - Same electrolyte as the anode C - External current running through the vessel D - All of the above Correct Answer(s): B Marked as: Incorrect _______________________________________________

Question 3:

Cathodic protection current must be:

A - Direct current B - Stray current C - Alternating current D - Indirect current Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 4:

The most common source of current for an impressed current system is a rectifier, which transforms

A - AC into DC B - Alternating current into AC C - AC into indirect current D - DC into AC Correctness Rule: Single Correct Answer Required Correct Answer(s): A Marked as: Incorrect _______________________________________________

Question 5:

Cathodic protection is the use of indirect current from an external source to oppose the discharge of corrosion current from cathodic areas of a metal structure immersed in a conducting medium or electrolyte such as soil and water.

A - True B - False Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________

Question 6:

Which of the following metals is found the highest on the galvanic series chart?

A - Zinc B - Steel C - Copper D - Nickel Correctness Rule: Single Correct Answer Required Answer(s) Given: D Correct Answer(s): D Marked as: Correct _______________________________________________

Question 7:

Cooling water systems are excellent areas for corrosion to take place. All of the following are factors that contribute to corrosion in cooling water systems except:

A - High and low temperatures B - An oxygen-saturated system C - A drop in pH to low levels D - The absence of dissolved solids in the raw water makeup Correctness Rule: Single Correct Answer Required Answer(s) Given: D Correct Answer(s): D Marked as: Correct _______________________________________________

Question 8:

Before disconnecting piping under cathodic protection, it is important to shut off the cathodic protection or install a jumper across the intended gap. In most plants, the disturbing of cathodic protection requires a:

A - Backhoe B - Plant shutdown C - Hot Work permit D - All of the above Correctness Rule: Single Correct Answer Required Answer(s) Given: C Correct Answer(s): C Marked as: Correct _______________________________________________

Question 9:

Based on the chart shown here, which of the combinations of metals listed would have the greatest tendency for galvanic corrosion when joined?

A - Aluminum bronze and tin B - Titanium and copper C - Nickel and zinc D - Nickel and monel Correctness Rule: Single Correct Answer Required Answer(s) Given: C Correct Answer(s): C

Question 10:

Impressed current systems are commonly used where large currents are required. Direct current is discharged through one or more anodes into the:

A - Thermoelectric generators B - Electrolyte C - Low resistance backfill D - Structure requiring protection Correctness Rule: Single Correct Answer Required Answer(s) Given: D Correct Answer(s): D Marked as: Correct

Question 1:

Impressed current systems are commonly used where large currents are required. Direct current is discharged through one or more anodes into the:

A - Low resistance backfill B - Thermoelectric generators C - Electrolyte D - Structure requiring protection Correctness Rule: Single Correct Answer Required Answer(s) Given: D Correct Answer(s): D Marked as: Correct _______________________________________________

Question 2:

Caustic corrosion (caustic gouging) takes place where corrosion products are deposited and is usually found in ______________ areas of the boiler.

A - High heat B - Low fluid level C - Low heat D - High fluid level Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 3:

Cooling water systems are excellent areas for corrosion to take place. All of the following are factors that contribute to corrosion in cooling water systems except:

A - High and low temperatures B - The absence of dissolved solids in the raw water makeup C - A drop in pH to low levels D - An oxygen-saturated system Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________

Question 4:

Cathodic protection is the use of indirect current from an external source to oppose the discharge of corrosion current from cathodic areas of a metal structure immersed in a conducting medium or electrolyte such as soil and water.

A - True B - False Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________

Question 5:

The most common source of current for an impressed current system is a rectifier, which transforms

A - DC into AC B - Alternating current into AC C - AC into indirect current D - AC into DC Correctness Rule: Single Correct Answer Required Answer(s) Given: D Correct Answer(s): D Marked as: Correct _______________________________________________

Question 6:

Which of the following metals is found the highest on the galvanic series chart?

A - Steel B - Copper C - Nickel D - Zinc Correctness Rule: Single Correct Answer Required Answer(s) Given: C Correct Answer(s): C Marked as: Correct _______________________________________________

Question 7:

Pitting in boiler metal is caused by:

A - Oxygen B - Carbon dioxide C - Chlorides D - Ammonia Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 8:

Ammonia has been used for corrosion control in inert gas systems and is an example of:

A - A cathodic inhibitor B - An anodic inhibitor C - A volatile neutralizer D - A passivating inhibitor Correctness Rule: Single Correct Answer Required Answer(s) Given: C Correct Answer(s): C Marked as: Correct _______________________________________________

Question 9:

Based on the chart shown here, which of the combinations of metals listed would have the greatest tendency for galvanic corrosion when joined?

A - Aluminum bronze and tin B - Nickel and zinc C - Titanium and copper D - Nickel and monel Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________

Question 10:

There is one type of corrosion that is most responsible for destructive explosions involving boilers. What is it?

A - Pitting B - Hydrogen damage C - Caustic embrittlement D - Caustic corrosion Correctness Rule: Single Correct Answer Required Answer(s) Given: C Correct Answer(s): C Marked as: Correct Question 1:

The most common source of current for an impressed current system is a rectifier, which transforms

A - Alternating current into AC B - AC into DC C - AC into indirect current D - DC into AC Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________

Question 2:

Cathodic protection is the use of indirect current from an external source to oppose the discharge of corrosion current from cathodic areas of a metal structure immersed in a conducting medium or electrolyte such as soil and water.

A - True B - False Correctness Rule: Single Correct Answer Required Answer(s) Given: B Correct Answer(s): B Marked as: Correct _______________________________________________

Question 3:

Cathodic protection can only be applied to the surface of the metal exposed to the:

A - Anodic areas of the structure B - Same electrolyte as the anode C - External current running through the vessel D - All of the above Correct Answer(s): B Question 4:

Before disconnecting piping under cathodic protection, it is important to shut off the cathodic protection or install a jumper across the intended gap. In most plants, the disturbing of cathodic protection requires a:

A - Backhoe B - Plant shutdown C - Hot Work permit D - All of the above Correct Answer(s): C Question 5:

Pitting failure can occur anywhere in the boiler, particularly in economizers, superheaters, reheaters, and the nonheated portions of water wall tubes. One of the methods used to control pitting in boilers is to:

A - Keep the boiler full of chemically treated water B - Blanket the boiler with oxygen during shutdown periods C - Eliminate the residual of oxygen scavenger chemicals in the boiler water D - Ensure that the deaerator is operated to effectively add oxygen to the feed water Correctness Rule: Single Correct Answer Required Answer(s) Given: A Correct Answer(s): A Marked as: Correct _______________________________________________

Question 6: