Wastewater Class 4 Exam Virginia
with correct answers 2025/2026
Invanvelectricalvcircuit,vthevgroundingvwirevisvindicatedvbyvwhichvcolor?v-vcorrectvanswers-Green
AccordingvtovthevOhmsvLaw,vwhichvelectricalvunitvmeasuresvpressure?v-vcorrectvanswers-Volts
AccordingvtovthevOhmsvLaw,vwhichvelectricalvunitvmeasuresvresistance?v-vcorrectvanswers-Ohms
AccordingvtovthevOhmsvLaw,vwhichvelectricalvunitvmeasuresvcurrent?v-vcorrectvanswers-Amps
Howvdovyouvconvertvcubicvfeetvtovgallons?v-vcorrectvanswers-Multiplyvbyv7.48
Howvdovyouvconvertvgallonsvtovpounds?v-vcorrectvanswers-Multiplyvbyv8.34
CalculatevthevSVIvofvyourvaerationvbasinvwhenvyourv30-
minutevsettleablevsamplevisv360vmL/Lvandvyourvaveragevmixedvliquorvsuspendedvsolidsvconcentrat
ionvisv4000vmg/L.v-vcorrectvanswers-90
, Solution:
360vxv1,000
-------------v=v90
v 4,000
Whatvisvthevmostvwidelyvusedvdechlorinationvagentvinvavconventionalvchlorinevgasvplant?v-
vcorrectvanswers-SulfurvDioxide
Whatvisvthevmostvprominentvconcernvinvfailingvtovremovevgritvfromvthevwastewater?v-
vcorrectvanswers-Excessivevwearvandvdamagevonvmechanicalvequipment
WhatvisvthevchemicalvformulavforvSulfuricvAcid?v-vcorrectvanswers-H2SO4
Whatvisvthevidealvvelocityvinvavgritvchannel,vinvfeetvpervsecond?v-vcorrectvanswers-1vfps
Conventionalvpumpvpackingvshouldvbe:v-vcorrectvanswers-Tightenedvdownvtovavdrip
Invavprimaryvclarifier,vthevexpectedvperformancevforvremovingvsettleablevsolidsvisv90-
95%vremoval.vWhatvaboutvthevremovalvofvsuspendedvsolids?v-vcorrectvanswers-50%
Whenvpreparingvavsamplevforvlaboratoryvanalysisvthatvinvolvesvacidvandvwater,vhowvshouldvthevsa
mplevbevpoured?v-vcorrectvanswers-Alwaysvpourvthevacidvintovthevwater
Youvarevtaskedvwithvrecordingvavmanualvflowvsamplevinvanvopenvchannel.vWherevwillvyouvpositionv
yourself,vrelativevtovthevweir,vtovrecordvthevmostvaccuratevmeasurevofvflow?v-vcorrectvanswers-
Behindvthevweir,v4vtimesvthevmaximumvheadvofvthevweir
with correct answers 2025/2026
Invanvelectricalvcircuit,vthevgroundingvwirevisvindicatedvbyvwhichvcolor?v-vcorrectvanswers-Green
AccordingvtovthevOhmsvLaw,vwhichvelectricalvunitvmeasuresvpressure?v-vcorrectvanswers-Volts
AccordingvtovthevOhmsvLaw,vwhichvelectricalvunitvmeasuresvresistance?v-vcorrectvanswers-Ohms
AccordingvtovthevOhmsvLaw,vwhichvelectricalvunitvmeasuresvcurrent?v-vcorrectvanswers-Amps
Howvdovyouvconvertvcubicvfeetvtovgallons?v-vcorrectvanswers-Multiplyvbyv7.48
Howvdovyouvconvertvgallonsvtovpounds?v-vcorrectvanswers-Multiplyvbyv8.34
CalculatevthevSVIvofvyourvaerationvbasinvwhenvyourv30-
minutevsettleablevsamplevisv360vmL/Lvandvyourvaveragevmixedvliquorvsuspendedvsolidsvconcentrat
ionvisv4000vmg/L.v-vcorrectvanswers-90
, Solution:
360vxv1,000
-------------v=v90
v 4,000
Whatvisvthevmostvwidelyvusedvdechlorinationvagentvinvavconventionalvchlorinevgasvplant?v-
vcorrectvanswers-SulfurvDioxide
Whatvisvthevmostvprominentvconcernvinvfailingvtovremovevgritvfromvthevwastewater?v-
vcorrectvanswers-Excessivevwearvandvdamagevonvmechanicalvequipment
WhatvisvthevchemicalvformulavforvSulfuricvAcid?v-vcorrectvanswers-H2SO4
Whatvisvthevidealvvelocityvinvavgritvchannel,vinvfeetvpervsecond?v-vcorrectvanswers-1vfps
Conventionalvpumpvpackingvshouldvbe:v-vcorrectvanswers-Tightenedvdownvtovavdrip
Invavprimaryvclarifier,vthevexpectedvperformancevforvremovingvsettleablevsolidsvisv90-
95%vremoval.vWhatvaboutvthevremovalvofvsuspendedvsolids?v-vcorrectvanswers-50%
Whenvpreparingvavsamplevforvlaboratoryvanalysisvthatvinvolvesvacidvandvwater,vhowvshouldvthevsa
mplevbevpoured?v-vcorrectvanswers-Alwaysvpourvthevacidvintovthevwater
Youvarevtaskedvwithvrecordingvavmanualvflowvsamplevinvanvopenvchannel.vWherevwillvyouvpositionv
yourself,vrelativevtovthevweir,vtovrecordvthevmostvaccuratevmeasurevofvflow?v-vcorrectvanswers-
Behindvthevweir,v4vtimesvthevmaximumvheadvofvthevweir
