TCEQ Class A Prep Part 1 /TCEQ Class A Water
License Exam Already Passed!!
The MCL for Trihalomethanes in drinking water is - ✔✔✔ANSWER-0.080
mg/l
At room temperatures chlorine gas is - ✔✔✔ANSWER-greenish-yellow , has
pungent odor, and is 2.5 heaver then air
Disease that may be spread by inadequately disinfected water are -
✔✔✔ANSWER-typhoid, cholera, infectious hepatitis, legionnaires disease.
minimum chlorine residuals of free and toral in the far reaches of the distribution
system is - ✔✔✔ANSWER-.2/.5
Parameters that effect coagulation are - ✔✔✔ANSWER-Turbidity, PH and
Alkalinity coagulant and dosage.
Do not work in a trench ________ feet or deeper unless it is protected from cave-in
- ✔✔✔ANSWER-5 feet
Place spoil banks at least ________ feet from the excavation -
,✔✔✔ANSWER-2
dose new water mains with a minimum of ----mg/l or more chlorine for at least
how many hours - ✔✔✔ANSWER-100mg/l-3hours or 25mg/l -24 hours
one bacteriological sample is required for each ------ of new completed main -
✔✔✔ANSWER-1000 feet of line
A cross connection is a physical connection between a public water supply and ? -
✔✔✔ANSWER-1) another supply of unknown or questionable quality 2) any
source that may contain contamination and 3) any water that is treated to a lesser
degree.
maximum spacing between ladders in a trench is - ✔✔✔ANSWER-50 feet
when should a rapid sand filter be backwashed? - ✔✔✔ANSWER-when its
dirty, when water will no longer pass through the filter, loss of head of 6 to 10 feet,
turbidity reading higher than 0.5 NTU
a ditch 4 feet wide , 6 feet deep and 1000 feet long will ve excavated . how many
cubic yards of pipe bedding will be needed to to bed the trech 7 inches deep. -
✔✔✔ANSWER-This is a volume question. so you would multiplied 4 feet by
1000 feet and convert this 7 inches to percent them multiplied that to get your
leanth times with times height . that gives you the cubic feet so you need to devide
by 27 to get the cubic yards 85.9 yd3
, how many gallons will 5000 feet of 18 inch water pipe hold ? -
✔✔✔ANSWER-this is volume question so find the volume of a cylinder.
convert 18 to feet first then 3.14x r squared x 7.48 (1 cubic foot of water) so this
one will look like 3.14x.75x.75.5000x7.48=66057.75 gallons ( round up)
A tank that has a capacity of 700,000 gallons must be disinfected with a dosaged of
50 mg/l of chlorine. how much 65% HTH will it take to achive the same goal -
✔✔✔ANSWER-mgdx8.34.50 is your normal forumal to find lbs of chlorine.
how ever we need that is for 100 % we have 65% so you will need to
.7mgdx8.34x50mg/l /.65 =449.07
The minimum residual water pressure required by Rules and Regulations for
publics water systems (30 TAC Chapter 290 subchapter D ) is -
✔✔✔ANSWER-20 psi under demand conditions
Dead end mains should be flushed every - ✔✔✔ANSWER-month
water hardness is caused by - ✔✔✔ANSWER-calcium and magnesium salts
transpiration is - ✔✔✔ANSWER-the release of water vapor into the air by
plants
The presents of nitrates in water can cause - ✔✔✔ANSWER-blue babies
License Exam Already Passed!!
The MCL for Trihalomethanes in drinking water is - ✔✔✔ANSWER-0.080
mg/l
At room temperatures chlorine gas is - ✔✔✔ANSWER-greenish-yellow , has
pungent odor, and is 2.5 heaver then air
Disease that may be spread by inadequately disinfected water are -
✔✔✔ANSWER-typhoid, cholera, infectious hepatitis, legionnaires disease.
minimum chlorine residuals of free and toral in the far reaches of the distribution
system is - ✔✔✔ANSWER-.2/.5
Parameters that effect coagulation are - ✔✔✔ANSWER-Turbidity, PH and
Alkalinity coagulant and dosage.
Do not work in a trench ________ feet or deeper unless it is protected from cave-in
- ✔✔✔ANSWER-5 feet
Place spoil banks at least ________ feet from the excavation -
,✔✔✔ANSWER-2
dose new water mains with a minimum of ----mg/l or more chlorine for at least
how many hours - ✔✔✔ANSWER-100mg/l-3hours or 25mg/l -24 hours
one bacteriological sample is required for each ------ of new completed main -
✔✔✔ANSWER-1000 feet of line
A cross connection is a physical connection between a public water supply and ? -
✔✔✔ANSWER-1) another supply of unknown or questionable quality 2) any
source that may contain contamination and 3) any water that is treated to a lesser
degree.
maximum spacing between ladders in a trench is - ✔✔✔ANSWER-50 feet
when should a rapid sand filter be backwashed? - ✔✔✔ANSWER-when its
dirty, when water will no longer pass through the filter, loss of head of 6 to 10 feet,
turbidity reading higher than 0.5 NTU
a ditch 4 feet wide , 6 feet deep and 1000 feet long will ve excavated . how many
cubic yards of pipe bedding will be needed to to bed the trech 7 inches deep. -
✔✔✔ANSWER-This is a volume question. so you would multiplied 4 feet by
1000 feet and convert this 7 inches to percent them multiplied that to get your
leanth times with times height . that gives you the cubic feet so you need to devide
by 27 to get the cubic yards 85.9 yd3
, how many gallons will 5000 feet of 18 inch water pipe hold ? -
✔✔✔ANSWER-this is volume question so find the volume of a cylinder.
convert 18 to feet first then 3.14x r squared x 7.48 (1 cubic foot of water) so this
one will look like 3.14x.75x.75.5000x7.48=66057.75 gallons ( round up)
A tank that has a capacity of 700,000 gallons must be disinfected with a dosaged of
50 mg/l of chlorine. how much 65% HTH will it take to achive the same goal -
✔✔✔ANSWER-mgdx8.34.50 is your normal forumal to find lbs of chlorine.
how ever we need that is for 100 % we have 65% so you will need to
.7mgdx8.34x50mg/l /.65 =449.07
The minimum residual water pressure required by Rules and Regulations for
publics water systems (30 TAC Chapter 290 subchapter D ) is -
✔✔✔ANSWER-20 psi under demand conditions
Dead end mains should be flushed every - ✔✔✔ANSWER-month
water hardness is caused by - ✔✔✔ANSWER-calcium and magnesium salts
transpiration is - ✔✔✔ANSWER-the release of water vapor into the air by
plants
The presents of nitrates in water can cause - ✔✔✔ANSWER-blue babies
