EXAM 2025-2026 QUESTIONS AND CORRECT
DETAILED ANSWERS WITH RATIONALES ||
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<RECENT VERSION>
1. what to look for when visually observing - ANSWER ✓ turbulence,
Floc
distribution
short circuit
2. what is the operators responsibility - ANSWER ✓ visual observation
3. coagulation and Flocculation are pretreatment for what - ANSWER ✓
sedimentaion abd filtration
4. what is tapered energy mixing - ANSWER ✓ the reducing of speeds in each
basin
5. at what PH does all bicarbonate compounds convert to carbonate forms -
ANSWER ✓ 11.3
6. what are lower alkalinity acids - ANSWER ✓ alumn sulfate carbon dioxcide
7. the main reason for using Soda Ash in the softening process is to remove
.....? - ANSWER ✓ non carbonate hardness
8. the finished water leaving the ion exchange unit is considered....? -
ANSWER ✓ Corrosive
,9. if you have a problem in the sedimentaion what should you do - ANSWER
✓ look up stream
10.which of the following is present when the PH is 8.3 - ANSWER ✓
bicarbonate
11.is the Flocculation slower or fast mixing and what does it help - ANSWER
✓ slow practical collision
12.the capacity to neutralize acids - ANSWER ✓ alkalinity
13.for every blank of Alum added blank mg /l of bicarbonate alkalinity must be
available - ANSWER ✓ 1.0 and .045
14.if the hardness is greater then total alkalinity you have - ANSWER ✓
permanent hardness
15.is the CA and MG bond with bicarbonate or carbonate you have - ANSWER
✓ temporary hardness
16.what is reduced in each selective basin as the water goes through and speed
reduces - ANSWER ✓ turbulence (n)
17.why are vertical Flocculation best for use - ANSWER ✓ less maitenance and
non submersible bearings
18.what are types of flocculators - ANSWER ✓ Horizontal pattie or vertical
Flocculation
19.chlorine gas - ANSWER ✓ is highly toxic and can be fatal; is corrosive in
damp surroundings
20.the rules and regulations for public water systems states that distribution
systems must maintain a chlorine residual of - ANSWER ✓ 0.2mg/l of free
chlorine or 0.5mg/l of chloramines in the far reaches of the distribution
system
21.ozone is - ANSWER ✓ toxic to humans
, 22.when a section of water main is replaced, any organic material allowed to
remain inside the pipe will - ANSWER ✓ increase chlorine demand and
decrease chlorine residual
23.Pressure is commonly measured in - ANSWER ✓ Pounds per square inch
(psi)
24.Which ph measurements would indicate that water - ANSWER ✓
Acrid/neutral/basic
6.0;6.9/7.0/8.3
25.Reverse water flow in a distribution system caused by a vacuum in a water
supply main is called - ANSWER ✓ Backsiphonage
26.A centrifugal type pump should never be run empty except momentarily
because - ANSWER ✓ The parts lubricated by water would be damaged
27.A new section of water main has just been laid before it is completely back
filled and put into service several things must be done what is the correct
order for doing them - ANSWER ✓ Pressure test,flush,disinfect,flush collect
bacti sample
28.Check valve on a discharge side of a pump are used to - ANSWER ✓
Prevent water fro, flowing back through the pump when it is shut off
29.The maximum allowable time for samples to be submitted to the laboratory
is - ANSWER ✓ 30hrs
30.An electrochemical means of preventing corrosion on tank surfaces below
the water line - ANSWER ✓ Cathodic protection
31.Underground pipe failures relates to - ANSWER ✓ Improper backfill and
lack of proper bedding
32.Type "c" soil - ANSWER ✓ Always use shoring (1 1/2 to 1-)