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Water Distribution Exam Questions with
Answers (100% Correct Answers)
A noisy or vibrating valve may be an indication of what? Answer: Cavitation
The selective destruction or inactivation of pathogenic organisms is Answer:
Disinfection
Pathogenic organisms can be removed from water, killed, or inactivated by
Answer: Filtration
The most commonly used distribution system disinfection is Answer: Free
chlorine
A greenish- yellow gas with a penetrating and distinctive odor, two and a half
times heavier than air is Answer: Chlorine
A brief session to discuss aspects of a job and safety Answer: Tailgate safety
meeting
The most common means of disinfecting drinking water used today to protect
the public's health? Answer: Chlorination
What is the responsibility of water distribution system operators? Answer:
Ensure safe and pleasant drinking water is delivered to everyone's tap
A valve that automatically shuts off the flow into an elevated tank when the
water level in the tank reaches a predetermined level. Answer: Altitude valve
A pump consisting of an impeller fixed on a rotating shaft, that is enclosed in a
casing, and having an inlet and a discharge connection would be called
Answer: Centrifugal pump
What is the MAIN purpose of a water storage facility? Answer: To provide
sufficient supply of water to average daily demands on the water supply system
, 2
When is the best time to take a storage tank out of service? Answer: When
consumption is lowest
Gauges are commonly used on which side of a pump? Answer: Discharge side
A condition which atmospheric or dissolved molecular oxygen is present in the
aquatic environment is called Answer: Aerobic
What is palatable water Answer: Pleasing to the senses (tastes, odors, colors,
and turbidity)
All trenches must be effectively shored at ____ ft. or deeper Answer: 5ft
OSHA defines____________ as a person capable of identifying existing hazards
in the surroundings, or working conditions which are unsanitary, hazardous or
dangerous to employees, and who has authorization to take prompt corrective
measures to eliminate the hazards. Answer: Competent person
Instead of shoring, a trench may be sloped at what ratio? Answer: 2 :1
In what direction should the bell of a pipe be pointed when laying pipe
downhill? Answer: Uphill
When should the first lift of backfill be compacted when laying pipe? Answer:
Up to the horizontal centerline of the pipe
What is the most common type meter used for domestic services? Answer:
Nutating Disc
The combination of the displacement type (low flow) and velocity type (high
flow) meters are called a _____________ meter. Answer: Compound meter
In what year was the Safe Drinking Water Act passed? Answer: 1974
What is the available chlorine of calcium hypochlorite? Answer: 65%
Water Distribution Exam Questions with
Answers (100% Correct Answers)
A noisy or vibrating valve may be an indication of what? Answer: Cavitation
The selective destruction or inactivation of pathogenic organisms is Answer:
Disinfection
Pathogenic organisms can be removed from water, killed, or inactivated by
Answer: Filtration
The most commonly used distribution system disinfection is Answer: Free
chlorine
A greenish- yellow gas with a penetrating and distinctive odor, two and a half
times heavier than air is Answer: Chlorine
A brief session to discuss aspects of a job and safety Answer: Tailgate safety
meeting
The most common means of disinfecting drinking water used today to protect
the public's health? Answer: Chlorination
What is the responsibility of water distribution system operators? Answer:
Ensure safe and pleasant drinking water is delivered to everyone's tap
A valve that automatically shuts off the flow into an elevated tank when the
water level in the tank reaches a predetermined level. Answer: Altitude valve
A pump consisting of an impeller fixed on a rotating shaft, that is enclosed in a
casing, and having an inlet and a discharge connection would be called
Answer: Centrifugal pump
What is the MAIN purpose of a water storage facility? Answer: To provide
sufficient supply of water to average daily demands on the water supply system
, 2
When is the best time to take a storage tank out of service? Answer: When
consumption is lowest
Gauges are commonly used on which side of a pump? Answer: Discharge side
A condition which atmospheric or dissolved molecular oxygen is present in the
aquatic environment is called Answer: Aerobic
What is palatable water Answer: Pleasing to the senses (tastes, odors, colors,
and turbidity)
All trenches must be effectively shored at ____ ft. or deeper Answer: 5ft
OSHA defines____________ as a person capable of identifying existing hazards
in the surroundings, or working conditions which are unsanitary, hazardous or
dangerous to employees, and who has authorization to take prompt corrective
measures to eliminate the hazards. Answer: Competent person
Instead of shoring, a trench may be sloped at what ratio? Answer: 2 :1
In what direction should the bell of a pipe be pointed when laying pipe
downhill? Answer: Uphill
When should the first lift of backfill be compacted when laying pipe? Answer:
Up to the horizontal centerline of the pipe
What is the most common type meter used for domestic services? Answer:
Nutating Disc
The combination of the displacement type (low flow) and velocity type (high
flow) meters are called a _____________ meter. Answer: Compound meter
In what year was the Safe Drinking Water Act passed? Answer: 1974
What is the available chlorine of calcium hypochlorite? Answer: 65%
