1. A water system classified as “less than 100 GPM” typically serves:
A. Large municipalities
B. Industrial facilities only
C. Small communities or private systems
D. Regional water authorities
ANSWER : C
Explanation:
Systems under 100 GPM usually serve small communities, private
developments, campgrounds, or rural facilities, not large municipal or
industrial systems.
2. Which component is primarily responsible for moving water from the
well to the distribution system?
A. Pressure tank
B. Pump
C. Chlorinator
D. Storage reservoir
ANSWER : B
Explanation:
The pump provides the mechanical energy required to move water from the
source into the system.
3. The most common pump used in deep wells is a:
A. Jet pump
B. Centrifugal pump
,C. Submersible pump
D. Diaphragm pump
ANSWER : C
Explanation:
Submersible pumps are installed below the water level and are ideal for deep
wells due to efficiency and reduced cavitation.
4. What is the main purpose of a pressure tank in a small water system?
A. Store disinfectant
B. Reduce pump cycling
C. Filter contaminants
D. Increase water temperature
ANSWER : B
Explanation:
Pressure tanks reduce frequent pump starts, extending pump life and
maintaining consistent pressure.
5. Static water level is best described as:
A. Water level during pumping
B. Water level after pump shutdown
C. Depth of pump intake
D. Depth of casing
ANSWER : B
Explanation:
Static water level is the natural level of water in the well when the pump is
not running.
6. Drawdown refers to:
A. Depth of well casing
B. Difference between static and pumping water levels
,C. Pump horsepower
D. Total system pressure
ANSWER : B
Explanation:
Drawdown is the drop in water level caused by pumping.
7. Which treatment method is most commonly required for small water
systems?
A. Fluoridation
B. Chlorination
C. Reverse osmosis
D. Ion exchange
ANSWER : B
Explanation:
Chlorination is the most widely used and cost-effective disinfection method for
small systems.
8. The primary purpose of disinfection is to:
A. Improve taste
B. Remove sediment
C. Kill harmful microorganisms
D. Reduce hardness
ANSWER : C
Explanation:
Disinfection is essential to destroy bacteria, viruses, and pathogens that cause
waterborne disease.
9. What is the minimum recommended chlorine residual in a distribution
system?
, A. 0.1 mg/L
B. 0.2 mg/L
C. 0.5 mg/L
D. 2.0 mg/L
ANSWER : B
Explanation:
A minimum free chlorine residual of 0.2 mg/L helps ensure ongoing
disinfection in the system.
10. Which chemical is commonly used to adjust low pH in water systems?
A. Chlorine
B. Lime
C. Alum
D. Fluoride
ANSWER : B
Explanation:
Lime (calcium hydroxide) raises pH and reduces corrosion in acidic water.
11. Low pH water can cause:
A. Scaling
B. Biological growth
C. Corrosion
D. Increased hardness
ANSWER : C
Explanation:
Acidic water is corrosive and can damage pipes and fixtures.
12. A well log provides information about:
A. Monthly water bills
B. Aquifer characteristics
A. Large municipalities
B. Industrial facilities only
C. Small communities or private systems
D. Regional water authorities
ANSWER : C
Explanation:
Systems under 100 GPM usually serve small communities, private
developments, campgrounds, or rural facilities, not large municipal or
industrial systems.
2. Which component is primarily responsible for moving water from the
well to the distribution system?
A. Pressure tank
B. Pump
C. Chlorinator
D. Storage reservoir
ANSWER : B
Explanation:
The pump provides the mechanical energy required to move water from the
source into the system.
3. The most common pump used in deep wells is a:
A. Jet pump
B. Centrifugal pump
,C. Submersible pump
D. Diaphragm pump
ANSWER : C
Explanation:
Submersible pumps are installed below the water level and are ideal for deep
wells due to efficiency and reduced cavitation.
4. What is the main purpose of a pressure tank in a small water system?
A. Store disinfectant
B. Reduce pump cycling
C. Filter contaminants
D. Increase water temperature
ANSWER : B
Explanation:
Pressure tanks reduce frequent pump starts, extending pump life and
maintaining consistent pressure.
5. Static water level is best described as:
A. Water level during pumping
B. Water level after pump shutdown
C. Depth of pump intake
D. Depth of casing
ANSWER : B
Explanation:
Static water level is the natural level of water in the well when the pump is
not running.
6. Drawdown refers to:
A. Depth of well casing
B. Difference between static and pumping water levels
,C. Pump horsepower
D. Total system pressure
ANSWER : B
Explanation:
Drawdown is the drop in water level caused by pumping.
7. Which treatment method is most commonly required for small water
systems?
A. Fluoridation
B. Chlorination
C. Reverse osmosis
D. Ion exchange
ANSWER : B
Explanation:
Chlorination is the most widely used and cost-effective disinfection method for
small systems.
8. The primary purpose of disinfection is to:
A. Improve taste
B. Remove sediment
C. Kill harmful microorganisms
D. Reduce hardness
ANSWER : C
Explanation:
Disinfection is essential to destroy bacteria, viruses, and pathogens that cause
waterborne disease.
9. What is the minimum recommended chlorine residual in a distribution
system?
, A. 0.1 mg/L
B. 0.2 mg/L
C. 0.5 mg/L
D. 2.0 mg/L
ANSWER : B
Explanation:
A minimum free chlorine residual of 0.2 mg/L helps ensure ongoing
disinfection in the system.
10. Which chemical is commonly used to adjust low pH in water systems?
A. Chlorine
B. Lime
C. Alum
D. Fluoride
ANSWER : B
Explanation:
Lime (calcium hydroxide) raises pH and reduces corrosion in acidic water.
11. Low pH water can cause:
A. Scaling
B. Biological growth
C. Corrosion
D. Increased hardness
ANSWER : C
Explanation:
Acidic water is corrosive and can damage pipes and fixtures.
12. A well log provides information about:
A. Monthly water bills
B. Aquifer characteristics
