Tennessee Wastewater Operator Practice Exam

Where does air compression primarily occur in a rotary lobe blower?

1. Within the blower core

2. At the inlet

3. At the blower discharge

4. In the process tank

The correct answer is: At the blower discharge

Air compression in a rotary lobe blower primarily occurs at the blower discharge. The design of a rotary lobe blower incorporates two rotors that rotate in opposite directions, trapping air between the lobes and subsequently compressing it as the volume decreases. This increase in air pressure happens right before the air exits the blower, which is at the discharge point. When considering the various locations mentioned, the inlet is primarily where air enters the system; therefore, it is not where compression occurs. The blower core is where the operation takes place but does not specifically refer to the actual point of maximum compression. In the process tank, while air may be utilized, it is not the site of compression within the blower itself. Thus, the blower discharge is the correct answer because it is at this point that the air experiences the highest pressure as a result of the compression process taking place inside the blower.