Wastewater Treatment Grade 1 Exam
Questions with Answers
Fatal after a few breaths - ✔✔Concentrations of chlorine gas in excess of 1,000 ppm are...
Volume of the basin - ✔✔Routine weir maintenance should include checking the...
Yellow-green, toxic and heavier than air - ✔✔Correct set of characteristics of chlorine gas...
Mechanical seal - ✔✔Under normal operating conditions, which of the following seal types has
the longest life cycle?
Date, time and location of the sample collection - ✔✔Which of the following should always be
included on a sample label?
Hydrogen sulfide - ✔✔Which of the following gases has a rotten egg odor?
Increase the return sludge rate - ✔✔When operating a package aeration plant, an operator
notices that the secondary clarifier sludge blanket is higher than normal and the effluent
appears turbid. The operator should...
Cavitation - ✔✔Which of the following is associated with low internal pressures or excessively
high flow rates that are structurally detrimental to centrifugal pumps?
Wastewater containing high organic load - ✔✔A sample of raw wastewater has a carbonaceous
biochemical oxygen demand (CBOD) concentration of 450 ppm. This most likely indicates...
, 15 hr - ✔✔In a small town, wastewater is pumped from a lift station with a pump having a
capacity of 200 gpm (757 Lpm). The station receives 180,000 gal (681,300L) of water during an
average day. How many hours of run time will this pump have per day?
Water - ✔✔Chlorine is very corrosive when combined with...
Parshall flume - ✔✔The most commonly used device to measure large wastewater flow is a...
Add acid to the water first - ✔✔What is the proper way to mix water and acid?
A weir - ✔✔The simplest device used to measure flow in open channels is...
Sodium chloride - ✔✔Which of the following chemicals is beneficial in correcting the problem
that causes a facultative pond to change from a deep bright green to a dull gray color?
Guide wire - ✔✔Floating surface aerators are secured using a...
amps - ✔✔Electrical current draw rate is measured in
Check all hand-operated valves for operator orientation - ✔✔Before starting a new pump, an
operator should do which of the following firat?
Each employee - ✔✔Who is responsible for ensuring that safety rules are followed throughout
a treatment plant?
Volatile acids/alkalinity ratio - ✔✔Which of the following is most commonly used to determine
stabilization of solids in an aerobic digester?
Questions with Answers
Fatal after a few breaths - ✔✔Concentrations of chlorine gas in excess of 1,000 ppm are...
Volume of the basin - ✔✔Routine weir maintenance should include checking the...
Yellow-green, toxic and heavier than air - ✔✔Correct set of characteristics of chlorine gas...
Mechanical seal - ✔✔Under normal operating conditions, which of the following seal types has
the longest life cycle?
Date, time and location of the sample collection - ✔✔Which of the following should always be
included on a sample label?
Hydrogen sulfide - ✔✔Which of the following gases has a rotten egg odor?
Increase the return sludge rate - ✔✔When operating a package aeration plant, an operator
notices that the secondary clarifier sludge blanket is higher than normal and the effluent
appears turbid. The operator should...
Cavitation - ✔✔Which of the following is associated with low internal pressures or excessively
high flow rates that are structurally detrimental to centrifugal pumps?
Wastewater containing high organic load - ✔✔A sample of raw wastewater has a carbonaceous
biochemical oxygen demand (CBOD) concentration of 450 ppm. This most likely indicates...
, 15 hr - ✔✔In a small town, wastewater is pumped from a lift station with a pump having a
capacity of 200 gpm (757 Lpm). The station receives 180,000 gal (681,300L) of water during an
average day. How many hours of run time will this pump have per day?
Water - ✔✔Chlorine is very corrosive when combined with...
Parshall flume - ✔✔The most commonly used device to measure large wastewater flow is a...
Add acid to the water first - ✔✔What is the proper way to mix water and acid?
A weir - ✔✔The simplest device used to measure flow in open channels is...
Sodium chloride - ✔✔Which of the following chemicals is beneficial in correcting the problem
that causes a facultative pond to change from a deep bright green to a dull gray color?
Guide wire - ✔✔Floating surface aerators are secured using a...
amps - ✔✔Electrical current draw rate is measured in
Check all hand-operated valves for operator orientation - ✔✔Before starting a new pump, an
operator should do which of the following firat?
Each employee - ✔✔Who is responsible for ensuring that safety rules are followed throughout
a treatment plant?
Volatile acids/alkalinity ratio - ✔✔Which of the following is most commonly used to determine
stabilization of solids in an aerobic digester?
