Texas Class C Surface Water Exam Review
1. A chemical commonly used to raise pH is:
A) Chlorine
B) Lime (Soda ash)
C) Fluoride
D) Ammonia
Answer: B) Lime (Soda ash)
2. A chlorinator setting is 35 lbs/day. If the flow being chlorinated is 1.15 MGD, the
chlorine dosage is:
A) 2.5 mg/L
B) 3.0 mg/L
C) 3.65 mg/L
D) 4.2 mg/L
Answer: C) 3.65 mg/L
3. A chlorine cylinder valve is thought to be leaking. If ammonia vapor is passed near
the valve, the presence of a leak would be indicated by:
A) Yellow smoke
B) White smoke
C) Blue smoke
D) No visible sign
Answer: B) White smoke
4. A chlorine residual in water can be determined by using the reagent:
,A) Phenol red
B) Methyl orange
C) DPD (diethyl-p-phenylenediamine)
D) Litmus solution
Answer: C) DPD (diethyl-p-phenylenediamine)
5. A disease that cannot be contracted by drinking contaminated water is:
A) Cholera
B) Typhoid
C) Malaria
D) Dysentery
Answer: C) Malaria
6. A flow of 1.55 ft³ per second is ___ gpm:
A) 550 gpm
B) 625 gpm
C) 696 gpm
D) 750 gpm
Answer: C) 696 gpm
7. A grab sample represents the quality of the water when:
A) Throughout the day
B) Only when the sample was taken
C) For the entire week
D) During peak flow periods
,Answer: B) Only when the sample was taken
8. A hypochlorinator is used to feed ___ into a water supply:
A) Chlorine gas
B) Hypochlorite solution
C) Ammonia
D) Fluoride
Answer: B) Hypochlorite solution
9. A major cause of pump and motor shaft coupling wear is:
A) Excessive lubrication
B) High water pressure
C) Misalignment between pumps and motor flanges
D) Low voltage supply
Answer: C) Misalignment between pumps and motor flanges
10. A non-permit confined space by OSHA standards means a confined space that:
A) Requires a permit for entry
B) Does not contain or have the potential to contain any hazard capable of causing
death
C) Contains toxic gases
D) Has limited access points
Answer: B) Does not contain or have the potential to contain any hazard capable of
causing death
11. A pH reading of 6.0 in raw water indicates the sample is:
, A) Basic
B) Neutral
C) Acidic
D) Alkaline
Answer: C) Acidic
12. A pH value of 7.0 is considered to be:
A) Acidic
B) Basic
C) Neutral
D) Highly alkaline
Answer: C) Neutral
13. A pneumatic ejector lifts water from low points to higher levels. The device used
to achieve this is:
A) Centrifugal pump
B) Air compressor
C) Vacuum pump
D) Hydraulic pump
Answer: B) Air compressor
14. A pump may be damaged if it is started with the discharge valve closed, and the
pump is a(n):
A) Centrifugal pump
B) Submersible pump
C) Positive displacement pump
1. A chemical commonly used to raise pH is:
A) Chlorine
B) Lime (Soda ash)
C) Fluoride
D) Ammonia
Answer: B) Lime (Soda ash)
2. A chlorinator setting is 35 lbs/day. If the flow being chlorinated is 1.15 MGD, the
chlorine dosage is:
A) 2.5 mg/L
B) 3.0 mg/L
C) 3.65 mg/L
D) 4.2 mg/L
Answer: C) 3.65 mg/L
3. A chlorine cylinder valve is thought to be leaking. If ammonia vapor is passed near
the valve, the presence of a leak would be indicated by:
A) Yellow smoke
B) White smoke
C) Blue smoke
D) No visible sign
Answer: B) White smoke
4. A chlorine residual in water can be determined by using the reagent:
,A) Phenol red
B) Methyl orange
C) DPD (diethyl-p-phenylenediamine)
D) Litmus solution
Answer: C) DPD (diethyl-p-phenylenediamine)
5. A disease that cannot be contracted by drinking contaminated water is:
A) Cholera
B) Typhoid
C) Malaria
D) Dysentery
Answer: C) Malaria
6. A flow of 1.55 ft³ per second is ___ gpm:
A) 550 gpm
B) 625 gpm
C) 696 gpm
D) 750 gpm
Answer: C) 696 gpm
7. A grab sample represents the quality of the water when:
A) Throughout the day
B) Only when the sample was taken
C) For the entire week
D) During peak flow periods
,Answer: B) Only when the sample was taken
8. A hypochlorinator is used to feed ___ into a water supply:
A) Chlorine gas
B) Hypochlorite solution
C) Ammonia
D) Fluoride
Answer: B) Hypochlorite solution
9. A major cause of pump and motor shaft coupling wear is:
A) Excessive lubrication
B) High water pressure
C) Misalignment between pumps and motor flanges
D) Low voltage supply
Answer: C) Misalignment between pumps and motor flanges
10. A non-permit confined space by OSHA standards means a confined space that:
A) Requires a permit for entry
B) Does not contain or have the potential to contain any hazard capable of causing
death
C) Contains toxic gases
D) Has limited access points
Answer: B) Does not contain or have the potential to contain any hazard capable of
causing death
11. A pH reading of 6.0 in raw water indicates the sample is:
, A) Basic
B) Neutral
C) Acidic
D) Alkaline
Answer: C) Acidic
12. A pH value of 7.0 is considered to be:
A) Acidic
B) Basic
C) Neutral
D) Highly alkaline
Answer: C) Neutral
13. A pneumatic ejector lifts water from low points to higher levels. The device used
to achieve this is:
A) Centrifugal pump
B) Air compressor
C) Vacuum pump
D) Hydraulic pump
Answer: B) Air compressor
14. A pump may be damaged if it is started with the discharge valve closed, and the
pump is a(n):
A) Centrifugal pump
B) Submersible pump
C) Positive displacement pump
