Water Distribution practice exam #2
(D1-D2) Questions with 100% Correct
Solutions
What are electrodes and ultrasonic signals used for in a tank? - ANSWER Monitor
water level
Which part of the water main should a new service tap be installed? - ANSWER
45 degrees from the top of the water main
What is the purpose of a vacuumed breaker? - ANSWER Prevent back siphonage
Which type of valve is commonly used to isolate water mains during repairs to
minimize service outages? - ANSWER Gate valve
Pumping water level - static water level = - ANSWER Drawdown
What is purple pipe used for? - ANSWER Reclaimed water
Where is the correct location to install an air release valve - ANSWER Top of pipe
What must be performed prior to entering a confined space? - ANSWER Test for
oxygen deficiency/enrichment, combustible gases, and toxic gases
What does the C- factor of a pipe represent? - ANSWER Roughness of pipe interior
, Why should you never empty an underground storage tank when the groundwater level
is high? - ANSWER It may float the tank and cause damage to the facility
What is used to determine the bacteriological quality of a water supply? -
ANSWER Presence-absence of coliform bacteria
Which valve is available as a swing, double door, or slanting disc? - ANSWER Check valve
What is used to check the effectiveness of disinfection? - ANSWER Test for
coliform bacteria ( bacteriological result )
What are used to protect water mains and ranks from corrosion? - ANSWER Anodes
What is a common customer complaint during or immediately after fishing the
water main? - ANSWER Cloudiness and color in water
What is total dynamic head? - ANSWER Total static head plus head loss, when the
pump is operating
What is a connection between potable water system and an unapproved water
supply? - ANSWER Cross connection
What is tested in the field during the collection of bacteriological sample? - ANSWER
Test for chlorine residual
Which type of water meter diverts some of the flow through a bypass meter, which is
calibrated to register the total flow through the main pipelines? - ANSWER Proportional
meter
(D1-D2) Questions with 100% Correct
Solutions
What are electrodes and ultrasonic signals used for in a tank? - ANSWER Monitor
water level
Which part of the water main should a new service tap be installed? - ANSWER
45 degrees from the top of the water main
What is the purpose of a vacuumed breaker? - ANSWER Prevent back siphonage
Which type of valve is commonly used to isolate water mains during repairs to
minimize service outages? - ANSWER Gate valve
Pumping water level - static water level = - ANSWER Drawdown
What is purple pipe used for? - ANSWER Reclaimed water
Where is the correct location to install an air release valve - ANSWER Top of pipe
What must be performed prior to entering a confined space? - ANSWER Test for
oxygen deficiency/enrichment, combustible gases, and toxic gases
What does the C- factor of a pipe represent? - ANSWER Roughness of pipe interior
, Why should you never empty an underground storage tank when the groundwater level
is high? - ANSWER It may float the tank and cause damage to the facility
What is used to determine the bacteriological quality of a water supply? -
ANSWER Presence-absence of coliform bacteria
Which valve is available as a swing, double door, or slanting disc? - ANSWER Check valve
What is used to check the effectiveness of disinfection? - ANSWER Test for
coliform bacteria ( bacteriological result )
What are used to protect water mains and ranks from corrosion? - ANSWER Anodes
What is a common customer complaint during or immediately after fishing the
water main? - ANSWER Cloudiness and color in water
What is total dynamic head? - ANSWER Total static head plus head loss, when the
pump is operating
What is a connection between potable water system and an unapproved water
supply? - ANSWER Cross connection
What is tested in the field during the collection of bacteriological sample? - ANSWER
Test for chlorine residual
Which type of water meter diverts some of the flow through a bypass meter, which is
calibrated to register the total flow through the main pipelines? - ANSWER Proportional
meter
