TCEQ Wastewater (Class D) License Prep Exam Questions and Complete Solutions.

TCEQ Wastewater (Class D) License Prep Exam Questions and Complete Solutions Minimum velocity required to keep solids in suspension? - Answer: 2ft/sec Minimum required velocity a inverted siphon requires? - Answer: 3ft/sec Two most common pipe materials used in the collection system? - Answer: Clay & PVC OSHA minimum standards for shoring, sloping, or trench boxes are? - Answer: 5ft or deeper If the trench is _____ or deeper, use a portable ladder or other means of exit. - Answer: 4ft or deeper The ladder most extend ____ feet above the trench and be secured. - Answer: 3ft Ladders must be within ____ feet of trench workers and not more than ____ feet apart. - Answer: 25ft, 50ft The excavation spoil must be at least? - Answer: 2ft from the edge of the trench Which type of pump is most often used in a lift station? - Answer: Centrifugal Pump What is CMOM? - Answer: Capacity, management, operations, and maintenance Install water lines no closer to a water line than ____ feet - Answer: 9ft Chlorine helps ______ grease, making it easy to skim - Answer: Congeal The magnetic meter works by the law of ________ - Answer: Induction How often do you calibrate flow measuring devices? - Answer: Annually Primary clarifiers should remove _____ percent of the incoming BOD - Answer: 35% Primary sludge is about ________% water and _______% solids - Answer: 94-96% water, and 4-6% solids Primary clarifiers should remove ____ % of the BOD and _____% of the settleable solids - Answer: 35%, 90-95% Usual blanket depth in a secondary clarifier is no more than ____ of the sidewall depth - Answer: 1/4 When sludge is within _____ inches of the slot, withdraw sludge - Answer: 18 inches Microorganisms including bacteria, protozoa, fungi, and microscopic animals, feed on the organic waste and can remove_________% of the BOD from wastewater - Answer: 92-99% A return sludge pumping system must be capable of pumping at least ______ gpd/sf but not more than______ gpd/sf - Answer: 200gpd/sf, 400gpd/sf What are the two ways to maintain the microorganism balance? - Answer: Food to Microorganism ratio (F/M) & Mean Cell Residence Time (MCRT)