Texas Wastewater Class B Practice Exam

What could cause excessive power consumption by a pump?

1. Proper calibration of the pump

2. Dirty filters

3. Worn bearings and worn impeller

4. Increased viscosity of fluid

The correct answer is: Worn bearings and worn impeller

Excessive power consumption by a pump can be attributed to several factors, one of which is the condition of its components. Worn bearings and a worn impeller can lead to increased friction and reduced efficiency. As these components deteriorate, the pump has to work harder to maintain the desired flow rate, which results in higher energy consumption. The impeller, being the main part that moves the fluid, is crucial for pump performance; any wear can impede its ability to effectively move the fluid, thus requiring more power. While other factors like dirty filters and increased fluid viscosity can also contribute to higher power consumption, the specific mechanical issues presented in worn bearings and an impeller are direct mechanical deficiencies that significantly increase power requirements. Proper calibration of the pump typically ensures optimal performance and does not contribute to excess power use when functioning correctly.