Texas Class D Water Test
Study online at https://quizlet.com/_bn3ng1
1. Who is authorized to remove a lock and tag placed on Only the person who
a piece of equipment to isolate it for maintenance? placed the lock and tag
2. In addition of an emergency residual pressure of 20 35 psi
psi, what is the minimum normal operating pressure a
public water supply system should maintain?
3. What is the minimum distance separating installed 9 feet
water mains from any sewer lines or other possible
contaminated lines?
4. What is the minimum distance required to separate 50 feet
grazing livestock and septic tanks from a public well?
5. What color does the sample turn when the DPD Red
reagent is added to water containing chlorine?
6. A system is operating at a flow rate of 2.2 MGD. A 176 pounds
chlorine dose of 10 mg/L is required to maintain a
disinfectant residual of 0.4 mg/L. Calculate the daily
chlorine demand in pounds.
7. A tank with 1 foot of water above a pressure gauge at 0.433 psi
the bottom will register a reading of:
8. Pipe and fittings used in public water systems may not 0.25%, 0.2%
contain more than ____% lead or solder and flux may
not contain more than ____% lead.
9. Chlorine tablets (Calcium hypochlorite) should not Petroleum
come in contact with ________ based products due to
the violent reaction that will result.
10.
, Texas Class D Water Test
Study online at https://quizlet.com/_bn3ng1
What is the condition called which affects young chil-
dren and is caused by high nitrate levels in drinking
water? (choose all that apply)
11. How much does one gallon of water weigh? 8.34 lbs
12. How many hours does the system operator have to
contact the state regulatory authority by phone if a
contamination event occurs in a public water system
at 8:00 Monday morning and the administrative office
closes at 4:00 p.m.?
13. After disinfecting a newly installed water main, bacte- 1,000
riological samples are required to be collected every
____ feet along the new line.
14. For water to be considered Potable, it: (choose all that Contains a chlorine resid-
apply): ual, Is free of pathogens,
Coliform free
15. Which choice(s) below is/are sources of groundwater? Aquifer
(choose all that apply)
16. Which waterborne diseases below may be spread by Typhoid, hepatis, dysen-
water that has not been properly disinfected? (choose tery, crypto, cholera.
all that apply)
17. A Texas Class D Water Operator cannot renew his li- 250
cense if he operates a groundwater treatment system
with _____ service connections.
18. What is the purpose of installing a check valve on the Prevent damage to the
discharge side of a centrifugal pump? pump motor when not in
operation
Study online at https://quizlet.com/_bn3ng1
1. Who is authorized to remove a lock and tag placed on Only the person who
a piece of equipment to isolate it for maintenance? placed the lock and tag
2. In addition of an emergency residual pressure of 20 35 psi
psi, what is the minimum normal operating pressure a
public water supply system should maintain?
3. What is the minimum distance separating installed 9 feet
water mains from any sewer lines or other possible
contaminated lines?
4. What is the minimum distance required to separate 50 feet
grazing livestock and septic tanks from a public well?
5. What color does the sample turn when the DPD Red
reagent is added to water containing chlorine?
6. A system is operating at a flow rate of 2.2 MGD. A 176 pounds
chlorine dose of 10 mg/L is required to maintain a
disinfectant residual of 0.4 mg/L. Calculate the daily
chlorine demand in pounds.
7. A tank with 1 foot of water above a pressure gauge at 0.433 psi
the bottom will register a reading of:
8. Pipe and fittings used in public water systems may not 0.25%, 0.2%
contain more than ____% lead or solder and flux may
not contain more than ____% lead.
9. Chlorine tablets (Calcium hypochlorite) should not Petroleum
come in contact with ________ based products due to
the violent reaction that will result.
10.
, Texas Class D Water Test
Study online at https://quizlet.com/_bn3ng1
What is the condition called which affects young chil-
dren and is caused by high nitrate levels in drinking
water? (choose all that apply)
11. How much does one gallon of water weigh? 8.34 lbs
12. How many hours does the system operator have to
contact the state regulatory authority by phone if a
contamination event occurs in a public water system
at 8:00 Monday morning and the administrative office
closes at 4:00 p.m.?
13. After disinfecting a newly installed water main, bacte- 1,000
riological samples are required to be collected every
____ feet along the new line.
14. For water to be considered Potable, it: (choose all that Contains a chlorine resid-
apply): ual, Is free of pathogens,
Coliform free
15. Which choice(s) below is/are sources of groundwater? Aquifer
(choose all that apply)
16. Which waterborne diseases below may be spread by Typhoid, hepatis, dysen-
water that has not been properly disinfected? (choose tery, crypto, cholera.
all that apply)
17. A Texas Class D Water Operator cannot renew his li- 250
cense if he operates a groundwater treatment system
with _____ service connections.
18. What is the purpose of installing a check valve on the Prevent damage to the
discharge side of a centrifugal pump? pump motor when not in
operation
