Water distribution practice exam #2 (D1-
// // // // //
D2) questions with correct answers
// // // //
Which /
/process /
/converts //ammonia //to //nitrite //and //nitrate? //- //CORRECT //ANSWERS(S)✔✔Nitrification
What /
/is /
/the /
/maximum /
/advisable /
/rate /
/of /
/chlorine /
/gas /
/removal //from //a //150- //pound //cylinder? //- //CORRECT //ANSWERS(S)✔✔40 //pounds //per //day
What /
/is //
a/
/type /
/of //positive //displacement //water //meter? //- //CORRECT //ANSWERS(S)✔✔Nutating- //disk //meter
What //is //a //power-
operated /
/mechanism //for //opening //and //closing //a //valve? //- //CORRECT //ANSWERS(S)✔✔Actuator
What /
/is /
/required /
,/if //
a/
/routine //sample //test //positive //for //total //coliform //bacteria? //- //CORRECT //ANSWERS(S)✔✔Take
//repeat //samples
Why /
/is //
a/
/grid /
/layout /
/better /
/than //
a //tree //layout //for //a //water //distribution //system? //- //CORRECT //ANSWERS(S)✔✔Less //dead-
end //mains
What /
/is /
/the /
/purpose /
/of //a //reduced //pressure //principle //assembly? //- //CORRECT //ANSWERS(S)✔✔Prevents //back-
pressure //and //back-siphonage
In /
/general, /
/at /
/what /
/depths /
/is /
/shoring /
/required /
/for //a //trench, //if //you're //excavating //in //soil? //- //CORRECT //ANSWERS(S)✔✔5 //feet //or //deeper
What /
/occurs /
, /after /
/breakpoint /
/chlorination /
/is /
/achieved? //- /
/CORRECT /
/ANSWERS(S)✔✔Free /
/available //chlorine //residual //is //directly //proportional //to //the //amount //of //chlorine //added
What //is //used //to //automatically //shut-
off //the //flow //into //a //tank //when //the //water //level //reaches //a //pre-
determined //level? //- //CORRECT //ANSWERS(S)✔✔Altitude //valve
What /
/would /
/be /
/used /
/to /
/find //
a/
/chlorine /
/gas /
/leak, /
/which /
/produces /
/white /
/smoke /
/when /
/it /
/reacts /
/with /
/this //substance? //- //CORRECT //ANSWERS(S)✔✔Spray //ammonia //solution //vapor //near //leak
What /
/causes //staining //of //plumbing //fixtures? //- //CORRECT //ANSWERS(S)✔✔Iron //& //manganese
// // // // //
D2) questions with correct answers
// // // //
Which /
/process /
/converts //ammonia //to //nitrite //and //nitrate? //- //CORRECT //ANSWERS(S)✔✔Nitrification
What /
/is /
/the /
/maximum /
/advisable /
/rate /
/of /
/chlorine /
/gas /
/removal //from //a //150- //pound //cylinder? //- //CORRECT //ANSWERS(S)✔✔40 //pounds //per //day
What /
/is //
a/
/type /
/of //positive //displacement //water //meter? //- //CORRECT //ANSWERS(S)✔✔Nutating- //disk //meter
What //is //a //power-
operated /
/mechanism //for //opening //and //closing //a //valve? //- //CORRECT //ANSWERS(S)✔✔Actuator
What /
/is /
/required /
,/if //
a/
/routine //sample //test //positive //for //total //coliform //bacteria? //- //CORRECT //ANSWERS(S)✔✔Take
//repeat //samples
Why /
/is //
a/
/grid /
/layout /
/better /
/than //
a //tree //layout //for //a //water //distribution //system? //- //CORRECT //ANSWERS(S)✔✔Less //dead-
end //mains
What /
/is /
/the /
/purpose /
/of //a //reduced //pressure //principle //assembly? //- //CORRECT //ANSWERS(S)✔✔Prevents //back-
pressure //and //back-siphonage
In /
/general, /
/at /
/what /
/depths /
/is /
/shoring /
/required /
/for //a //trench, //if //you're //excavating //in //soil? //- //CORRECT //ANSWERS(S)✔✔5 //feet //or //deeper
What /
/occurs /
, /after /
/breakpoint /
/chlorination /
/is /
/achieved? //- /
/CORRECT /
/ANSWERS(S)✔✔Free /
/available //chlorine //residual //is //directly //proportional //to //the //amount //of //chlorine //added
What //is //used //to //automatically //shut-
off //the //flow //into //a //tank //when //the //water //level //reaches //a //pre-
determined //level? //- //CORRECT //ANSWERS(S)✔✔Altitude //valve
What /
/would /
/be /
/used /
/to /
/find //
a/
/chlorine /
/gas /
/leak, /
/which /
/produces /
/white /
/smoke /
/when /
/it /
/reacts /
/with /
/this //substance? //- //CORRECT //ANSWERS(S)✔✔Spray //ammonia //solution //vapor //near //leak
What /
/causes //staining //of //plumbing //fixtures? //- //CORRECT //ANSWERS(S)✔✔Iron //& //manganese
