Water distribution level 3 Exam Questions
and answers 2025
A .factor .or .value .used .to .indicate .the .smoothness .of .the .interior .of .a .pipe .-
.ANS✓✓-Cfactor
Major .parts .of .water .distribution .- .ANS✓✓-Pipes, .storage .facilities, .pumping
.stations, .valves .,fire .hydrants, .meters, .and .other .appurtenances
Main .purpose .of .water .storage .facilities .- .ANS✓✓-To .provide .sufficient .amount
.of .water .to .average .or .equalize .the .daily .demands .on .the .water .supply .system
Types .of .storage .facilities .- .ANS✓✓-Clear .wells, .elevated
.tanks,standpipes,ground .level .storage .tanks ., .hydro .pneumatic .or .pressure
.tanks, .and .surge .tanks
20 .psi .- .ANS✓✓-Absolute .minimum .pressure
35 .psi .- .ANS✓✓-Minimum .working .pressure
Basic .requirements .of .pipes .- .ANS✓✓-Adequate .strength, .durability,maximum
.corrosion, .resistance .and .no .adverse .effect .on .water .quality
Four .classes .of .working .pressure .are .commonly .encountered .- .ANS✓✓-
100,150,200,250 .psi
Push .on .and .mechanical .joints .are .most .often .used .for .- .ANS✓✓-Ductile .iron
.pipe. .Flanges, .restrained, .flexible, .and .sleeve .joints .are .also .used
Flange .joints .- .ANS✓✓-Not .flexible
Restrained .joints .- .ANS✓✓-Prevent .movement
Flexible .joints .- .ANS✓✓-Permits .one .joint .to .move
PE .pipe .- .ANS✓✓-Has .the .highest .cfactors .150
Pipe .protection .- .ANS✓✓-Paint
Rock .must .be .excavated .- .ANS✓✓-6inches
, Ladder .must .b .located .- .ANS✓✓-25 .ft .and .3ft .above .hole
Laying .pipe .is .also .called .- .ANS✓✓-Stringing
The .horizontal .shoring .members .are .generally .referred .to .as .- .ANS✓✓-
Stringers .or .walers
Shield .shoring .- .ANS✓✓-Consists .of .a .rectangular .box .that .must .b .open .on
.the .top .and .bottom .and .usually .the .ends .are .open .too
Solid .sheeting .- .ANS✓✓-Used .when .materials .will .not .stand .in .a .vertical
.position .or .not .practical .to .slope .the .trench
Types .of .valves .- .ANS✓✓-Plug, .rotary,butterfly, .diaphragm, .gate
Entrained .- .ANS✓✓-Air .to .escape .a .line .is .operating .under .pressure
4 .parts .to .a .hydrant .- .ANS✓✓-Inlet .pipe .connection .from .the .water .supply
.main,the .main .valve,the .barrel,the .head
Post .hydrants .- .ANS✓✓-Extend .above .ground .most .commonly .used
Rule .of .thumb .- .ANS✓✓-Meter .should .b .one .size .smaller .that .service .line
3basic .backflow .devices .- .ANS✓✓-Double .check .valve, .reduced
.pressure(rp),air .gap-provides .greatest .protection
The .source .of .supply .might .b .a .- .ANS✓✓-Well
Preventive .- .ANS✓✓-Scheduled
Corrective .- .ANS✓✓-Equipment .failure
Predictive .- .ANS✓✓-Maintenance .program
Bacteriological .samples .are .analyzed .for .the .presence .of .- .ANS✓✓-Total
.coliform. .Presence .of .these .bacteria .indicates .other .forms .may .b .present
Minimum .chlorine .residual .- .ANS✓✓-Free .0.2mg/l .Combined .0.6mg/l
Cross .connection .- .ANS✓✓-A .connection .between .potable .water .system .and
.an .unknown .water .supply
The .particular .type .of .device .most .suitable .for .a .given .situation .depends .on .-
.ANS✓✓-The .degree .of .hazard
and answers 2025
A .factor .or .value .used .to .indicate .the .smoothness .of .the .interior .of .a .pipe .-
.ANS✓✓-Cfactor
Major .parts .of .water .distribution .- .ANS✓✓-Pipes, .storage .facilities, .pumping
.stations, .valves .,fire .hydrants, .meters, .and .other .appurtenances
Main .purpose .of .water .storage .facilities .- .ANS✓✓-To .provide .sufficient .amount
.of .water .to .average .or .equalize .the .daily .demands .on .the .water .supply .system
Types .of .storage .facilities .- .ANS✓✓-Clear .wells, .elevated
.tanks,standpipes,ground .level .storage .tanks ., .hydro .pneumatic .or .pressure
.tanks, .and .surge .tanks
20 .psi .- .ANS✓✓-Absolute .minimum .pressure
35 .psi .- .ANS✓✓-Minimum .working .pressure
Basic .requirements .of .pipes .- .ANS✓✓-Adequate .strength, .durability,maximum
.corrosion, .resistance .and .no .adverse .effect .on .water .quality
Four .classes .of .working .pressure .are .commonly .encountered .- .ANS✓✓-
100,150,200,250 .psi
Push .on .and .mechanical .joints .are .most .often .used .for .- .ANS✓✓-Ductile .iron
.pipe. .Flanges, .restrained, .flexible, .and .sleeve .joints .are .also .used
Flange .joints .- .ANS✓✓-Not .flexible
Restrained .joints .- .ANS✓✓-Prevent .movement
Flexible .joints .- .ANS✓✓-Permits .one .joint .to .move
PE .pipe .- .ANS✓✓-Has .the .highest .cfactors .150
Pipe .protection .- .ANS✓✓-Paint
Rock .must .be .excavated .- .ANS✓✓-6inches
, Ladder .must .b .located .- .ANS✓✓-25 .ft .and .3ft .above .hole
Laying .pipe .is .also .called .- .ANS✓✓-Stringing
The .horizontal .shoring .members .are .generally .referred .to .as .- .ANS✓✓-
Stringers .or .walers
Shield .shoring .- .ANS✓✓-Consists .of .a .rectangular .box .that .must .b .open .on
.the .top .and .bottom .and .usually .the .ends .are .open .too
Solid .sheeting .- .ANS✓✓-Used .when .materials .will .not .stand .in .a .vertical
.position .or .not .practical .to .slope .the .trench
Types .of .valves .- .ANS✓✓-Plug, .rotary,butterfly, .diaphragm, .gate
Entrained .- .ANS✓✓-Air .to .escape .a .line .is .operating .under .pressure
4 .parts .to .a .hydrant .- .ANS✓✓-Inlet .pipe .connection .from .the .water .supply
.main,the .main .valve,the .barrel,the .head
Post .hydrants .- .ANS✓✓-Extend .above .ground .most .commonly .used
Rule .of .thumb .- .ANS✓✓-Meter .should .b .one .size .smaller .that .service .line
3basic .backflow .devices .- .ANS✓✓-Double .check .valve, .reduced
.pressure(rp),air .gap-provides .greatest .protection
The .source .of .supply .might .b .a .- .ANS✓✓-Well
Preventive .- .ANS✓✓-Scheduled
Corrective .- .ANS✓✓-Equipment .failure
Predictive .- .ANS✓✓-Maintenance .program
Bacteriological .samples .are .analyzed .for .the .presence .of .- .ANS✓✓-Total
.coliform. .Presence .of .these .bacteria .indicates .other .forms .may .b .present
Minimum .chlorine .residual .- .ANS✓✓-Free .0.2mg/l .Combined .0.6mg/l
Cross .connection .- .ANS✓✓-A .connection .between .potable .water .system .and
.an .unknown .water .supply
The .particular .type .of .device .most .suitable .for .a .given .situation .depends .on .-
.ANS✓✓-The .degree .of .hazard
