Water distribution practice D1-D2 Exam
Questions and answers 2025
The .only .absolutely .reliable .method .of .backflow .prevention .is .the .use .of .- .ANS
✓✓-Air .Gap
The .bubbles .formed .in .a .positive .multiple .tube .fermentation .test .are .- .ANS✓✓-
Carbon .Dioxide
The .maximum .rate .of .withdrawal .of .gas .from .a .150lb .chlorine .cylinder .in .24-
hours .is .- .ANS✓✓-40 .lbs
If .you .encounter .a .liquid .chlorine .leak .in .a .one .tone .container, .what .action
.should .you .take .first, .to .reduce .the .severity .of .the .leak? .- .ANS✓✓-Rotate .the
.container .to .place .the .leak .at .the .top
The .most .commonly .used .water .disinfectant .in .the .United .States .is .- .ANS✓✓-
Chlorine
When .collecting .a .distribution .system .sample, .the .water .should .be .allowed .to
.run .for .a .period .of .time .prior .to .sample .collection. .How .long .- .ANS✓✓-As .long
.as .necessary .to .permit .cleaning .of .service .line
Sample .bottles .wich .are .furnished .by .a .certified .laboratory .for .collection .of
.bacteriological .samples .- .ANS✓✓-Are .ready .to .use
The .difference .between .water .pressure .upstream .and .downstream .of .a .pump
.when .it .is .not .in .operations .is .know .as .the .- .ANS✓✓-Total .static .head
A .device .that .automatically .shuts .off .flow .in .an .elevated .storage .tank .when .the
.water .level .in .the .tank .reache .a .preset .level .is .termed .a .- .ANS✓✓-Altitude
.valve
In .an .occupied .trench .requiring .personal .egress .what .is .the .maximum
.allowable .distance .between .a .worker .and .an .exit .letter .- .ANS✓✓-25 .feet
A .water .bearing .formation .in .the .soil .is .referred .to .as .- .ANS✓✓-An .aquifer
The .distance .between .the .static .water .level .and .the .pumping .water .level .is
.termed .the .- .ANS✓✓-Drawdown
Questions and answers 2025
The .only .absolutely .reliable .method .of .backflow .prevention .is .the .use .of .- .ANS
✓✓-Air .Gap
The .bubbles .formed .in .a .positive .multiple .tube .fermentation .test .are .- .ANS✓✓-
Carbon .Dioxide
The .maximum .rate .of .withdrawal .of .gas .from .a .150lb .chlorine .cylinder .in .24-
hours .is .- .ANS✓✓-40 .lbs
If .you .encounter .a .liquid .chlorine .leak .in .a .one .tone .container, .what .action
.should .you .take .first, .to .reduce .the .severity .of .the .leak? .- .ANS✓✓-Rotate .the
.container .to .place .the .leak .at .the .top
The .most .commonly .used .water .disinfectant .in .the .United .States .is .- .ANS✓✓-
Chlorine
When .collecting .a .distribution .system .sample, .the .water .should .be .allowed .to
.run .for .a .period .of .time .prior .to .sample .collection. .How .long .- .ANS✓✓-As .long
.as .necessary .to .permit .cleaning .of .service .line
Sample .bottles .wich .are .furnished .by .a .certified .laboratory .for .collection .of
.bacteriological .samples .- .ANS✓✓-Are .ready .to .use
The .difference .between .water .pressure .upstream .and .downstream .of .a .pump
.when .it .is .not .in .operations .is .know .as .the .- .ANS✓✓-Total .static .head
A .device .that .automatically .shuts .off .flow .in .an .elevated .storage .tank .when .the
.water .level .in .the .tank .reache .a .preset .level .is .termed .a .- .ANS✓✓-Altitude
.valve
In .an .occupied .trench .requiring .personal .egress .what .is .the .maximum
.allowable .distance .between .a .worker .and .an .exit .letter .- .ANS✓✓-25 .feet
A .water .bearing .formation .in .the .soil .is .referred .to .as .- .ANS✓✓-An .aquifer
The .distance .between .the .static .water .level .and .the .pumping .water .level .is
.termed .the .- .ANS✓✓-Drawdown
