Question 170Electricity & Electronics - Assistant Engineer

The correct answer is C) it may imbed metallic particles into coil insulation. High-pressure compressed air should not be used to clean electric motors or controller equipment because the force of the air blast can drive small metallic particles from the surface of the equipment into the insulation of the coils and windings. This can lead to short circuits and potential damage to the electrical components. The other answer choices are incorrect because they do not directly address the issue of metallic particle contamination, which is the primary concern with using high-pressure air for this type of cleaning.