Water Supply Systems Overview
MOBILE WATER SUPPLY 2026 ACTUAL QUESTIONS
AND APPROVED ANSWERS WITH COMPLETE
SOLUTION
1. Which is a condition that occurs when a pump is ran too fast and you hear a pinging
noise?
capitulation
drawdown
overdraw
cavitation
2. A 4-log inactivation, such as with viruses, is how much removal?
96%
99%
99.9%
99.99%
3. The inlet side of the pump is commonly called the
Cone
Adapter
Influencer
Suction
4. Chlorine gas normally comes in:
150lb and ton cylinders
Bulk Trucks
150lb and 2 ton boxes
10lb and 50lb cylinders
, 120lb and 2 ton cylinders
5. If excessive leakage is observed from a packing gland, the operator should
Adjust the gland to achieve a slow, steady drip
, Remove the packing gland
Tighten the gland until no leakage is observed
Do nothing
6. Trihalomethanes (THM's) are primarily a concern in?
Hard Water
Water before chlorine disinfection treatment
Water after chlorine disinfection treatment
Lakes and Reservoirs
7. The flow characteristics of a water pipeline can be reduced by;
tuberculation
pumping
air release valves
looping
8. Trihalomethanes are ______________.
an acute (immediate) health risk
a chronic (long-term) health risk
an aesthetic water quality problem
not a significant concern
9. A venturi is being used to measure the flow rate in a cooling water system. As the
water flows from the throat to the discharge of the venturi, water pressure will
________________; and volumetric flow rate will ___________ _.
increase; remain the same
increase; decrease
decrease; remain the same
decrease; decrease
, 10. Percolation of water is sometimes refered to as ________________ _.
interception
throughfall
groundwater recharge
return flow
11. Where are Coliform bacteria primarily present?
Amphibian stomachs
Human and warm-blooded animal intestinal tracts
Stormwater
Agricultural runoff
None of the above
12. In order to ensure effective disinfection and maintain a safe level of residual chlorine
in treated water, what must be considered when determining the appropriate
chlorine dosage?
Total chlorine demand
Initial water temperature
pH level of the water
Presence of organic matter
13. Chlorine used in disinfecting pipelines in a tablet or powdered form is called what?
Sodium hypochlorite
Sodium hypochloride
Calcium hypochlorite
Calcium hypochloride
14. What is the primary reason for using Sodium Thiosulfate in water sampling
procedures?
To enhance the growth of bacteria
MOBILE WATER SUPPLY 2026 ACTUAL QUESTIONS
AND APPROVED ANSWERS WITH COMPLETE
SOLUTION
1. Which is a condition that occurs when a pump is ran too fast and you hear a pinging
noise?
capitulation
drawdown
overdraw
cavitation
2. A 4-log inactivation, such as with viruses, is how much removal?
96%
99%
99.9%
99.99%
3. The inlet side of the pump is commonly called the
Cone
Adapter
Influencer
Suction
4. Chlorine gas normally comes in:
150lb and ton cylinders
Bulk Trucks
150lb and 2 ton boxes
10lb and 50lb cylinders
, 120lb and 2 ton cylinders
5. If excessive leakage is observed from a packing gland, the operator should
Adjust the gland to achieve a slow, steady drip
, Remove the packing gland
Tighten the gland until no leakage is observed
Do nothing
6. Trihalomethanes (THM's) are primarily a concern in?
Hard Water
Water before chlorine disinfection treatment
Water after chlorine disinfection treatment
Lakes and Reservoirs
7. The flow characteristics of a water pipeline can be reduced by;
tuberculation
pumping
air release valves
looping
8. Trihalomethanes are ______________.
an acute (immediate) health risk
a chronic (long-term) health risk
an aesthetic water quality problem
not a significant concern
9. A venturi is being used to measure the flow rate in a cooling water system. As the
water flows from the throat to the discharge of the venturi, water pressure will
________________; and volumetric flow rate will ___________ _.
increase; remain the same
increase; decrease
decrease; remain the same
decrease; decrease
, 10. Percolation of water is sometimes refered to as ________________ _.
interception
throughfall
groundwater recharge
return flow
11. Where are Coliform bacteria primarily present?
Amphibian stomachs
Human and warm-blooded animal intestinal tracts
Stormwater
Agricultural runoff
None of the above
12. In order to ensure effective disinfection and maintain a safe level of residual chlorine
in treated water, what must be considered when determining the appropriate
chlorine dosage?
Total chlorine demand
Initial water temperature
pH level of the water
Presence of organic matter
13. Chlorine used in disinfecting pipelines in a tablet or powdered form is called what?
Sodium hypochlorite
Sodium hypochloride
Calcium hypochlorite
Calcium hypochloride
14. What is the primary reason for using Sodium Thiosulfate in water sampling
procedures?
To enhance the growth of bacteria
