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Texas Basic Waste Water Operations Final Exam Review - Statistics
General Stats
- This quiz has been taken 116 times
- The average score is 17 of 30
Answer Stats
| Question | Answer | % Correct |
|---|---|---|
| When an accidental discharge, bypass, or spill occurs, the discharger must notify the TCEQ within ________ hours. | 24 | 91%
|
| Each person contributes about ________ lbs of BOD daily. | 0.17 | 88%
|
| The primary purpose of returning sludge in the activated sludge process is to have enough ________ in the aeration basin to match the food supply. | microorganisms | 82%
|
| A ladder must be within ________ feet of anyone in the trench. | 25 | 79%
|
| Protecting Texas water from contamination requires ________ of wastewater. | all of the above | 79%
|
| The primary causes of wastewater stoppage are ________. | roots and grease | 79%
|
| An administrative penalty for discharge violations can be up to ________ per day. | $25,000 | 76%
|
| An ultrasonic flow monitoring device works on the principle of ________. | sonar | 76%
|
| Organic loading is the pounds per day of ________ per acre-feet or 1,000 cubic feet of media. | BOD | 68%
|
| Examples of waterborne pathogens are ________. | typhoid, cholera, and dysentery | 68%
|
| Excavations ________ feet or deeper should be shored, shielded, or sloped. | 5 | 65%
|
| The pH scale ranges from ________ to ________. | 0/14 | 62%
|
| A simple method of determining when to waste from an activated sludge plant is the ________. | 30-minute settling test | 62%
|
| A weir is an obstruction placed in a channel causing the water to ________. | back up | 62%
|
| Aerobic digestion is an ________ process whereby the aerobic bacteria consume themselves. | endogenous | 62%
|
| When sludge in an Imhoff tank is near ________ inches of the slot, withdraw sludge. | 18 | 56%
|
| Examples of point source discharges are ________. | municipal, industrial, and agricultural wastewater treatment facilities | 56%
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| Imhoff tanks are ________ story units with ________ compartments. | 2/3 | 53%
|
| Ponding on a trickling filter is caused by ________. | all of the above | 53%
|
| Organic loading of a stabilization pond is about ________ pounds of BOD/acre/day with a detention time of at least ________ days. | 35/30 | 50%
|
| In a well operated anaerobic digester, the methane gas content is about ________. | 65-75% | 50%
|
| Gas chlorinator feed rates are indicated by the ________ in pounds per day. | rotameter | 50%
|
| One surface acre of ponds provides treatment for about ________ people. | 300 | 44%
|
| When chlorine is used, the effective disinfectant is ________. | HOCl | 44%
|
| How many square feet are in the end section of a 24-inch wastewater pipe? | 3.14 square feet | 38%
|
| The most important problem prevented by monitoring or restricting industrial waste is ________. | worker exposure | 35%
|
| A sedimentation tank is 80 feet long, 40 feet wide, and 16 feet deep. What is the detention time, in hours, at a flow rate of 1.8 MGD? | 5.1 hours | 29%
|
| How many cubic yards of dirt are removed from a trench 600 feet long, 4 feet wide, and 8 feet deep? | 711 cubic yards | 29%
|
| The normal operator controls on an activated sludge process are ________. | RAS, WAS, and DO | 29%
|
| A wastewater treatment plant treats 1,800,000 gallons per day, using chlorine at 10 mg/L dosage. How many pounds of chlorine are used per day? | 150 pounds | 21%
|
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