FAA Powerplant Written Practice Test

What solvent is commonly used to clean accessible condensers and coil cases in a magneto?

1. Alcohol

2. Acetone

3. Mineral spirits

4. Water

The correct answer is: Acetone

The correct choice is acetone, which is commonly used as a solvent for cleaning accessible condensers and coil cases in a magneto due to its effectiveness in removing oils, grease, and other contaminants without leaving a residue. Acetone has a low boiling point and evaporates quickly, making it an excellent choice for cleaning electrical components where moisture must be avoided. Using acetone helps to ensure the proper functioning of the magneto by preventing dirt and debris from affecting the electrical contacts and the overall performance of the system. Though other solvents like alcohol, mineral spirits, and water may also be used for cleaning, they may not provide the same level of efficiency or compatibility with the materials found within magneto components. For instance, alcohol can evaporate too slowly and might not be as effective in removing certain residues. Mineral spirits can leave an oily residue, which is undesirable in electrical systems. Water, while useful for cleaning, can promote corrosion or cause electrical shorts if not thoroughly dried, making acetone a more suitable choice for this specific application.