State water distribution operator clas

St te W ter Distribution Oper tor Cl ss
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Licensing Ex m Pr ctice Test Questions nd a a A




Correct nswers (Verified nswers) Plus A A




R tion les 2026/2027 Q& | Inst nt Downlo d
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Pdf



1. Wh t is the prim ry purpose of w ter distribution system?
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A. To disinfect w ter a




B. To tre t r w w ter a a a




C. To deliver s fe, pot ble w ter to consumers a a a




D. To store tre ted w ter a a




R tion le: Distribution systems exist to tr nsport s fe, finished w ter from
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tre tment to end users.
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2. Which type of pipe m teri l is most commonly used for l rge a a a




tr nsmission m ins?
a a

,A. PVC
B. Copper
C. Ductile iron
D. Le da




R tion le: Ductile iron h s high strength nd dur bility for l rge m ins.
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3. Wh t does SC D st nd for?
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A. System Control nd D t cquisition a a a A




B. Supervisory C libr tion nd D t utom tion
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C. Supervisory Control nd D t cquisition a a a A




D. System Control nd Distribution utom tiona A a




R tion le: SC D = Supervisory Control nd D t cquisition, used for
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monitoring systems.



4. Wh t is the typic l chlorine residu l required in distribution system?
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A. 0.05 mg/L
B. 0.1 mg/L
C. 0.2 mg/L
D. 2.0 mg/L
R tion le: Most st tes require detect ble residu l, typic lly ≥ 0.2 mg/L free
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chlorine.

,5. Wh t is the minimum pressure required in distribution system under
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norm l conditions?
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A. 10 psi
B. 20 psi
C. 25 psi
D. 35 psi
R tion le: St nd rd design m int ins t le st 35 psi to ensure service nd prevent
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cont min tion.
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6. Wh t is the function of n ir-rele se v lve?
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A. To dd oxygen
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B. To remove tr pped ir from pipelines
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C. To flush sediment
D. To regul te pressure
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R tion le: Tr pped ir reduces flow nd pressure; ir v lves rele se it.
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7. Wh t is the m in c use of w ter h mmer?
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A. High chlorine
B. Sudden ch nges in w ter velocity
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C. Corrosion
D. Low flow

, R tion le: F st v lve closures or pump st rts c use pressure surges c lled w ter
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h mmer.
a




8. Wh t is the st nd rd fire-flow requirement in most municip l systems?
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A. 100 gpm
B. 250 gpm
C. 500 gpm
D. 1,000 gpm
R tion le: Cl ss systems typic lly design for ~1,000 gpm for fire protection.
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9. cross-connection is defined s:
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A. le k in pipe
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B. physic l connection between pot ble nd non-pot ble sources
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C. w ter meter byp ss
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D. hydr nt connection
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R tion le: Cross-connections pose cont min tion risks nd require prevention
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devices.



10. Which device prevents b ckflow? a