Page 1 of 385
TEXAS WASTEWATER OPERATOR C PREP
EXAM Q. BANK | {LATEST 2026/ 2027 UPDATE}
COMPLETE ACTUAL AND AUTHENTIC EXAM |
BRAND NEW!
A treatment plant has two primary clarifiers. Each has a diameter of
36 ft. and a depth of 10 ft. If the design flow is 1.0 MGD, find the
surface loading on each clarifier in gal./ft.2/day. Assume the flow is
equally split between two clarifiers.
a. 350
b. 492
c. 725
d. 983
b. 492
3.14 x 18 ft x 18 ft = 1,017 ft2 (each clarifier surface)
1.0 mgd / 2 clarifiers = 500,000 gals (each clarifier mgd)
500,000 gals / 1,017 ft2 = 492 gals/ft2/day
,Page 2 of 385
What is the relationship between the F/M ratio and the MCRT for a
particular plant when the aeration basin detention time is a constant
value?
a. These two control parameters are unrelated.
b. When one increases the other increases.
c. When one increases the other decreases.
d. It is a direct relationship.
c. When one increases the other decreases.
Essentially, when there is less food available per microorganism, the
microorganisms stay in the system for a longer period of time (longer
MCRT) as they consume the limited food source more slowly.
When testing for hazardous atmospheres always check ________ first.
a. oxygen
b. carbon monoxide
c. hydrogen sulfide
d. time
a. oxygen
,Page 3 of 385
A crucible and filter weigh 22.1389 grams. After filtering 25 ml of the
sample through the filter, and then drying, desicating and weighing
them, the crucible, filter, and sample weigh 22.1437 grams. How many
mg/L of suspended solids are in the sample?
a. 132 mg/L
b. 154 mg/L
c. 185 mg/L
d. 192 mg/L
d. 192 mg/L
22.1437 g - 22.1389 g = 0.0048 g
0.0048 g * 1000 mg/g = 4.8 mg
(4.8 mg * 1000 ml/L) / 25 ml = 192 mg/L
When a sample of a plant unit influent is collected at any time, and a
sample of the effluent is collected corresponding to the unit's
detention time, the sample is a ________.
, Page 4 of 385
a. grab
b. composite
c. timed grab
d. all of the above
c. timed grab
The TCEQ requires scales and a ________ onsite at a chlorination
facility.
a. BCSA
b. SCBA
c. SABC
d. SBCA
b. SCBA
For safe working conditions equip basins, walkways, and ladders with
________.
a. gas detectors
b. guardrails
TEXAS WASTEWATER OPERATOR C PREP
EXAM Q. BANK | {LATEST 2026/ 2027 UPDATE}
COMPLETE ACTUAL AND AUTHENTIC EXAM |
BRAND NEW!
A treatment plant has two primary clarifiers. Each has a diameter of
36 ft. and a depth of 10 ft. If the design flow is 1.0 MGD, find the
surface loading on each clarifier in gal./ft.2/day. Assume the flow is
equally split between two clarifiers.
a. 350
b. 492
c. 725
d. 983
b. 492
3.14 x 18 ft x 18 ft = 1,017 ft2 (each clarifier surface)
1.0 mgd / 2 clarifiers = 500,000 gals (each clarifier mgd)
500,000 gals / 1,017 ft2 = 492 gals/ft2/day
,Page 2 of 385
What is the relationship between the F/M ratio and the MCRT for a
particular plant when the aeration basin detention time is a constant
value?
a. These two control parameters are unrelated.
b. When one increases the other increases.
c. When one increases the other decreases.
d. It is a direct relationship.
c. When one increases the other decreases.
Essentially, when there is less food available per microorganism, the
microorganisms stay in the system for a longer period of time (longer
MCRT) as they consume the limited food source more slowly.
When testing for hazardous atmospheres always check ________ first.
a. oxygen
b. carbon monoxide
c. hydrogen sulfide
d. time
a. oxygen
,Page 3 of 385
A crucible and filter weigh 22.1389 grams. After filtering 25 ml of the
sample through the filter, and then drying, desicating and weighing
them, the crucible, filter, and sample weigh 22.1437 grams. How many
mg/L of suspended solids are in the sample?
a. 132 mg/L
b. 154 mg/L
c. 185 mg/L
d. 192 mg/L
d. 192 mg/L
22.1437 g - 22.1389 g = 0.0048 g
0.0048 g * 1000 mg/g = 4.8 mg
(4.8 mg * 1000 ml/L) / 25 ml = 192 mg/L
When a sample of a plant unit influent is collected at any time, and a
sample of the effluent is collected corresponding to the unit's
detention time, the sample is a ________.
, Page 4 of 385
a. grab
b. composite
c. timed grab
d. all of the above
c. timed grab
The TCEQ requires scales and a ________ onsite at a chlorination
facility.
a. BCSA
b. SCBA
c. SABC
d. SBCA
b. SCBA
For safe working conditions equip basins, walkways, and ladders with
________.
a. gas detectors
b. guardrails
