Basic Wastewater Operator Practice Exam

What is one of the most likely causes of electric motor failure?

1. Running too long

2. Short run times

3. Excessive moisture

4. Dry conditions

The correct answer is: Excessive moisture

One of the most likely causes of electric motor failure is excessive moisture. Motors are typically designed to operate in environments with controlled humidity, and excessive moisture can lead to a range of failures in an electric motor. When moisture enters the motor, it can cause corrosion of electrical components, leading to shorts circuiting or failure of insulation material. This corrosion can degrade both performance and lifespan, resulting in thermal wear and ultimately failure. Moisture can also create an environment conducive to the growth of mold and mildew, which can further impair electrical connections and mechanical operations within the motor. Additionally, moisture can lead to the formation of electrical arcs, which can cause further damage to the motor windings and other internal components. Proper ventilation and environmental control are therefore critical in maintaining the operability and longevity of electric motors to prevent failure due to excess moisture.