When faced with a licensing exam, don't struggle with test anxiety! Use the question below and others from our Exam Study Guide series to study and prepare for exam questions. Take a look at this sample wastewater treatment licensing question along with an explanation of the correct answer.Sample question:When using a rotating biological contactor (RBC), which two conditions are required for effective operation?A. The rotating drum(s) must be 50 percent submerged and rotate at a speed greater than 2 rpms.
B. The rotating drum(s) must be 40 percent submerged and rotate at a speed no greater than 1.5 rpms.
C. The rotating
