WATER DISTRIBUTION PRACTICE 240
CERTIFICATION EVALUATION TESTED
QUESTIONS COMPLETE ANSWERS
◉ What is a disadvantage of having a tree formation in the water
distribution system
Answer: Dead-end mains
◉ If chlorine is injected into cold water, how would the cold
temperature affect the effectiveness of chlorine?
Answer: More contact time would be required
◉ If a confined space has 20.9% oxygen content, what does this tell
you?
Answer: Confined space is safe to enter
◉ What could be the problem if an excessive amount of water is
leaking from the stuffing box?
Answer: Packing may need to be replaced, or the packing gland may
need to be tightened
◉ What is installed on the suction pipe of a pump to prevent water
from draining out of the pump, and towards the suction pipe?
, Answer: Foot valve
◉ What problem would arise due to excessive air bubbles in a
pipeline
Answer: Air pocket forms at the high points
◉ What is formed when chlorine reacts with ammonia?
Answer: Chloramine
◉ What is the disadvantage of using ozone for disinfection?
Answer: Lack of disinfectant residuals
◉ Which water source is the most protected from pathogens
Answer: Deep well ( ground water )
◉ What is used to restrict leakage from the impeller discharge to the
pump suction?
Answer: Wear rings
◉ What is Trihalomethane?
Answer: Disinfection by-product
CERTIFICATION EVALUATION TESTED
QUESTIONS COMPLETE ANSWERS
◉ What is a disadvantage of having a tree formation in the water
distribution system
Answer: Dead-end mains
◉ If chlorine is injected into cold water, how would the cold
temperature affect the effectiveness of chlorine?
Answer: More contact time would be required
◉ If a confined space has 20.9% oxygen content, what does this tell
you?
Answer: Confined space is safe to enter
◉ What could be the problem if an excessive amount of water is
leaking from the stuffing box?
Answer: Packing may need to be replaced, or the packing gland may
need to be tightened
◉ What is installed on the suction pipe of a pump to prevent water
from draining out of the pump, and towards the suction pipe?
, Answer: Foot valve
◉ What problem would arise due to excessive air bubbles in a
pipeline
Answer: Air pocket forms at the high points
◉ What is formed when chlorine reacts with ammonia?
Answer: Chloramine
◉ What is the disadvantage of using ozone for disinfection?
Answer: Lack of disinfectant residuals
◉ Which water source is the most protected from pathogens
Answer: Deep well ( ground water )
◉ What is used to restrict leakage from the impeller discharge to the
pump suction?
Answer: Wear rings
◉ What is Trihalomethane?
Answer: Disinfection by-product
