WATER DISTRIBUTION OPERATOR
GRADE I4 TEST PAPER QUESTIONS
SOLUTIONS GRADED A+
●● 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
●● 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
GRADE I4 TEST PAPER QUESTIONS
SOLUTIONS GRADED A+
●● 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
●● 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
