CMPR 6007_Gas Compression - Compressor Components 6 page

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:

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 7:

Sacrificial anodes are made of materials like:

A - Graphite or titanium
B - Zinc or magnesium
C - Copper or aluminum
D - Nickel or chromium

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 8:

Passivating inhibitors function by:

A - Being electrodeposited onto mechanical parts
B - Forming precipitates on cathodic areas, which slow down the corrosion reactions
C - Being added to a system to neutralize acids
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 9:

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

A - Low fluid level
B - Low heat
C - High heat
D - High fluid level

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

_______________________________________________

Question 10:

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 - A drop in pH to low levels
B - An oxygen-saturated system
C - The absence of dissolved solids in the raw water makeup
D - High and low temperatures

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

Question 1:

Passivating inhibitors function by:

A - Being electrodeposited onto mechanical parts
B - Causing the metal to corrode, creating a protective oxide film
C - Forming precipitates on cathodic areas, which slow down the corrosion reactions
D - Being added to a system to neutralize acids

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 2:

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

A - Electrolyte
B - Thermoelectric generators
C - Structure requiring protection
D - Low resistance backfill

Correctness Rule: Single Correct Answer Required

Answer(s) Given: C
Correct Answer(s): C
Marked as: Correct

_______________________________________________

Question 3:

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

A - High fluid level
B - Low heat
C - Low fluid level
D - High heat

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
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:

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

A - A passivating inhibitor
B - A volatile neutralizer
C - An anodic inhibitor
D - A cathodic inhibitor

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

_______________________________________________

Question 6:

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

A - Internal protection of vessels that are partly filled with water
B - Hot spot (small areas of high corrosion) protection on bare buried pipelines.
C - Protection of short, well-coated buried pipelines
D - External protection of vessels that are partly filled with water

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
Marked as: Correct

_______________________________________________

Question 7:

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 8:

Pitting in boiler metal is caused by:

A - Chlorides
B - Oxygen
C - Ammonia
D - Carbon dioxide

Correctness Rule: Single Correct Answer Required

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

Correctness Rule: Single Correct Answer Required

Answer(s) Given: D
Correct Answer(s): D
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 - Caustic embrittlement
C - Caustic corrosion
D - Hydrogen damage

Correctness Rule: Single Correct Answer Required

Answer(s) Given: B
Correct Answer(s): B
Marked as: Correct

Date: 2015-12-11; view: 803