Corrosion Control Knowledge Evaluation

ESD Protective bags are the best option for storing circuit boards. ESD stands for Electrostatic Discharge, which refers to the sudden flow of electricity between two electrically charged objects. Circuit boards are sensitive to ESD and can be damaged if not properly protected. ESD Protective bags are designed to prevent the buildup and discharge of static electricity, providing a safe environment for storing circuit boards. This helps to ensure their integrity and functionality. Brown paper, wax coated, and plastic bags do not offer the same level of protection against ESD, making them less suitable for storing circuit boards.

If an antenna is attached to a tower using incorrectly sized bolts, it can lead to both stress corrosion and fatigue corrosion. Stress corrosion occurs when a material is subjected to tensile stress and a corrosive environment, causing cracks and failure. In this case, the incorrect size of bolts can create stress on the antenna and tower, leading to stress corrosion. Fatigue corrosion, on the other hand, occurs when a material is subjected to repeated stress cycles, causing cracks and failure over time. The incorrect size of bolts can also contribute to fatigue corrosion as the antenna and tower are constantly subjected to stress from wind, vibrations, and other external factors.

All of the above options, chlorides, sulfates, and nitrates, are often found in moisture and can accelerate the corrosive effect. Moisture can act as a catalyst for corrosion, and these substances, when present in the moisture, can further enhance the corrosive process. Chlorides, sulfates, and nitrates are all highly reactive and can promote the breakdown of metal surfaces, leading to accelerated corrosion. Therefore, all three options can contribute to the corrosive effect when present in moisture.

The correct answer is 50% isopropyl alcohol and 50% distilled water. Isopropyl alcohol is commonly used as a cleaning agent for electronic components because it evaporates quickly and leaves no residue. By diluting it with distilled water, it becomes a milder solution that can effectively remove fingerprints from printed circuit boards without causing damage. Commercial cleaners may contain harsh chemicals that can be harmful to the circuit board. Nail polish remover contains acetone, which can also damage the board. Emory paper is an abrasive material used for sanding and would not be suitable for removing fingerprints.

The correct answer is "all of the above". The overall goal of the unit CPCP is to ensure compliance with Occupational Safety and Health Administration, ensure compliance with Environmental Protection Agency, and conserve energy. This means that the unit aims to meet the requirements and regulations set by both the OSHA and EPA, while also promoting energy conservation practices.

Both A and B can cause biochemical corrosion. Secreted corrosive fluids from organisms can corrode the surface beneath their growth, while fungus that holds moisture can also lead to corrosion. Therefore, the combination of both factors can contribute to biochemical corrosion.

The most important element of the CPCP is preventative maintenance inspections. These inspections help identify potential issues before they become major problems, allowing for timely repairs and maintenance. By regularly inspecting the equipment and systems, any signs of corrosion or other issues can be detected early on, preventing costly damages and ensuring the overall efficiency and effectiveness of the CPCP.

Pitting corrosion is a type of corrosion that occurs when localized damage, such as small holes or pits, forms on the surface of aluminum or magnesium. This type of corrosion is often caused by factors such as exposure to corrosive substances or a breakdown in the protective coating. Pitting corrosion can be particularly problematic as it can lead to further degradation of the material and compromise its structural integrity. Therefore, the correct answer is "tiny holes in aluminum or magnesium."

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Filiform corrosion refers to the formation of worm-like tracings under a protective coating. This type of corrosion occurs when moisture penetrates the coating and reacts with the metal surface, leading to the formation of filaments that resemble worms. It is commonly observed in aluminum or magnesium materials and can cause damage to the protective coating and the underlying metal.

A solvent is a type of cleaner that is effective in removing heavy dirt and oil. Solvents are substances that have the ability to dissolve or break down other substances, including dirt and oil. They work by breaking the bonds between the dirt and oil particles, allowing them to be easily wiped or rinsed away. Solvents are commonly used in industrial and commercial cleaning applications where heavy dirt and oil buildup is common, such as in automotive and manufacturing industries.

The correct answer is "of a material caused by a reaction with the environment." This is because corrosion refers to the deterioration of a material, and this deterioration is caused by its reaction with the environment. The environment can include factors such as moisture, oxygen, temperature, and chemicals, which can all contribute to the corrosion process.

Galvanic corrosion is the most common form of attack on ESD-sensitive equipment. Galvanic corrosion occurs when two dissimilar metals are in contact with each other in the presence of an electrolyte, such as moisture. The difference in electrical potential between the two metals leads to the transfer of electrons, causing corrosion on the less noble metal. In the case of ESD-sensitive equipment, the different metals used in its construction can create a galvanic cell, leading to corrosion and potential damage to the equipment.

Fungi and waste products from animals and insects cause biochemical corrosion. This type of corrosion occurs when biological agents, such as microorganisms, break down organic materials and produce corrosive byproducts. These byproducts can react with metals and other materials, leading to corrosion. Therefore, the correct answer is biochemical.

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Modern military circuits are designed to be highly sensitive and efficient, requiring low voltages to operate effectively. This allows for better performance and reliability in complex military systems. A voltage as low as 25 volts is sufficient to power these circuits and ensure their proper functioning.