Tennessee Wastewater Operator Practice Exam

How many times per week should motors up to 100 hp ideally be started?

1. 2-3 times per week

2. 4-5 times per week

3. 6-7 times per week

4. 1 time per week

The correct answer is: 4-5 times per week

For motors up to 100 horsepower, starting them 4-5 times per week is generally ideal to ensure operational efficiency and to help maintain the health of the motor. Regular start and stop cycles allow the motor components to function within their designed parameters, helping to prevent issues such as overheating, excessive wear, and electrical faults. Starting at this frequency also allows for the motor and connected systems to be tested and maintained periodically. This helps in identifying any potential issues early, ensuring reliable operation in wastewater treatment processes, where consistent performance is critical. Furthermore, motors that are used too infrequently may develop problems with components like bearings and seals due to lack of lubrication, while motors started too often can experience thermal stress and premature wear. Thus, the balance of 4-5 starts per week provides a practical middle ground that fosters both operational reliability and longevity of the equipment.