Water distribution level 3 Exam
Questions and Answers Verified By
Experts
A factor or value used to indicate the smoothness of the interior of a pipe -
ANSWER-Cfactor
Major parts of water distribution - ANSWER-Pipes, storage facilities, pumping
stations, valves ,fire hydrants, meters, and other appurtenances
Main purpose of water storage facilities - ANSWER-To provide sufficient amount of
water to average or equalize the daily demands on the water supply system
Types of storage facilities - ANSWER-Clear wells, elevated tanks,standpipes,ground
level storage tanks , hydro pneumatic or pressure tanks, and surge tanks
20 psi - ANSWER-Absolute minimum pressure
35 psi - ANSWER-Minimum working pressure
Basic requirements of pipes - ANSWER-Adequate strength, durability,maximum
corrosion, resistance and no adverse effect on water quality
Four classes of working pressure are commonly encountered - ANSWER-
100,150,200,250 psi
Push on and mechanical joints are most often used for - ANSWER-Ductile iron pipe.
Flanges, restrained, flexible, and sleeve joints are also used
Flange joints - ANSWER-Not flexible
Restrained joints - ANSWER-Prevent movement
Flexible joints - ANSWER-Permits one joint to move
PE pipe - ANSWER-Has the highest cfactors 150
Pipe protection - ANSWER-Paint
Rock must be excavated - ANSWER-6inches
Ladder must b located - ANSWER-25 ft and 3ft above hole
Laying pipe is also called - ANSWER-Stringing
, The horizontal shoring members are generally referred to as - ANSWER-Stringers or
walers
Shield shoring - ANSWER-Consists of a rectangular box that must b open on the top
and bottom and usually the ends are open too
Solid sheeting - ANSWER-Used when materials will not stand in a vertical position or
not practical to slope the trench
Types of valves - ANSWER-Plug, rotary,butterfly, diaphragm, gate
Entrained - ANSWER-Air to escape a line is operating under pressure
4 parts to a hydrant - ANSWER-Inlet pipe connection from the water supply main,the
main valve,the barrel,the head
Post hydrants - ANSWER-Extend above ground most commonly used
Rule of thumb - ANSWER-Meter should b one size smaller that service line
3basic backflow devices - ANSWER-Double check valve, reduced pressure(rp),air
gap-provides greatest protection
The source of supply might b a - ANSWER-Well
Preventive - ANSWER-Scheduled
Corrective - ANSWER-Equipment failure
Predictive - ANSWER-Maintenance program
Bacteriological samples are analyzed for the presence of - ANSWER-Total coliform.
Presence of these bacteria indicates other forms may b present
Minimum chlorine residual - ANSWER-Free 0.2mg/l Combined 0.6mg/l
Cross connection - ANSWER-A connection between potable water system and an
unknown water supply
The particular type of device most suitable for a given situation depends on -
ANSWER-The degree of hazard
Pressure vacuum breaker and atmospheric vacuum breaker - ANSWER-Irrigation
backflows
Leak detection - ANSWER-Done at night
Backsiphonage - ANSWER-Caused by a negative or below atmospheric pressure
within a water System
Questions and Answers Verified By
Experts
A factor or value used to indicate the smoothness of the interior of a pipe -
ANSWER-Cfactor
Major parts of water distribution - ANSWER-Pipes, storage facilities, pumping
stations, valves ,fire hydrants, meters, and other appurtenances
Main purpose of water storage facilities - ANSWER-To provide sufficient amount of
water to average or equalize the daily demands on the water supply system
Types of storage facilities - ANSWER-Clear wells, elevated tanks,standpipes,ground
level storage tanks , hydro pneumatic or pressure tanks, and surge tanks
20 psi - ANSWER-Absolute minimum pressure
35 psi - ANSWER-Minimum working pressure
Basic requirements of pipes - ANSWER-Adequate strength, durability,maximum
corrosion, resistance and no adverse effect on water quality
Four classes of working pressure are commonly encountered - ANSWER-
100,150,200,250 psi
Push on and mechanical joints are most often used for - ANSWER-Ductile iron pipe.
Flanges, restrained, flexible, and sleeve joints are also used
Flange joints - ANSWER-Not flexible
Restrained joints - ANSWER-Prevent movement
Flexible joints - ANSWER-Permits one joint to move
PE pipe - ANSWER-Has the highest cfactors 150
Pipe protection - ANSWER-Paint
Rock must be excavated - ANSWER-6inches
Ladder must b located - ANSWER-25 ft and 3ft above hole
Laying pipe is also called - ANSWER-Stringing
, The horizontal shoring members are generally referred to as - ANSWER-Stringers or
walers
Shield shoring - ANSWER-Consists of a rectangular box that must b open on the top
and bottom and usually the ends are open too
Solid sheeting - ANSWER-Used when materials will not stand in a vertical position or
not practical to slope the trench
Types of valves - ANSWER-Plug, rotary,butterfly, diaphragm, gate
Entrained - ANSWER-Air to escape a line is operating under pressure
4 parts to a hydrant - ANSWER-Inlet pipe connection from the water supply main,the
main valve,the barrel,the head
Post hydrants - ANSWER-Extend above ground most commonly used
Rule of thumb - ANSWER-Meter should b one size smaller that service line
3basic backflow devices - ANSWER-Double check valve, reduced pressure(rp),air
gap-provides greatest protection
The source of supply might b a - ANSWER-Well
Preventive - ANSWER-Scheduled
Corrective - ANSWER-Equipment failure
Predictive - ANSWER-Maintenance program
Bacteriological samples are analyzed for the presence of - ANSWER-Total coliform.
Presence of these bacteria indicates other forms may b present
Minimum chlorine residual - ANSWER-Free 0.2mg/l Combined 0.6mg/l
Cross connection - ANSWER-A connection between potable water system and an
unknown water supply
The particular type of device most suitable for a given situation depends on -
ANSWER-The degree of hazard
Pressure vacuum breaker and atmospheric vacuum breaker - ANSWER-Irrigation
backflows
Leak detection - ANSWER-Done at night
Backsiphonage - ANSWER-Caused by a negative or below atmospheric pressure
within a water System
