Maintenance Technician Practice Test 2025 – 400 Free Practice Questions to Pass the Exam

The best choice for lubricating electric motors is non-conductive, high-temperature grease. This type of lubricant is specifically formulated to withstand the elevated temperatures that electric motors can generate during operation. It helps reduce friction between moving parts, which is critical for maintaining efficient motor function and prolonging the lifespan of the motor.

Additionally, being non-conductive is crucial, as it prevents any risk of electrical shorts that could occur if the lubricant were to conduct electricity. This contributes to the overall safety and reliability of the motor's operation. Non-conductive, high-temperature greases are also typically designed to adhere well to surfaces and resist washout from moisture or contaminants, ensuring they provide ongoing protection in demanding environments.

Other lubricants, such as water-based grease or petroleum jelly, may not offer the same high-temperature resistance or could potentially carry a risk of electrical conduction, making them less suitable for use in electric motors. Silicone spray, while useful in various applications for its moisture-displacing properties, does not provide the necessary thickness needed for effective lubrication under the mechanical stresses present in motors.