Wastewater Class 2 Multiple Choice
Latest 2026-2027. Questions & Correct
Verified Answers. Graded A
____________________ can be calculated by subtracting the chlorine
residual from the chlorine dosage. - ANSChlorine demand
87. When organic wastes are discharge to receiving waters, oxygen is
depleted by: - ANSB. Bacteria
88. In a manhole, the presence of hydrogen sulfide gives off an odour
similar to which of the following? - ANSC. Rotten eggs
89. Which of the following best describes coliform bacteria - ANSC.
Indicators
90. Employee hazards often found at wastewater treatment plants can
include: - ANSB. Oxygen deficiency
91. What is the percentage of solids removal achieved in primary clarifiers -
ANSD. 40 - 60
92. Three waterborne diseases can include: - ANSC. Typhoid fever,
dysentery and cholera
1
,94. Which of the following pH readings indicates an acidic wastewater
effluent? - ANSA. 3
96. At a wastewater treatment plant an outfall can be defined as which of
the following - ANSC. The discharge line leaving the plant
97. A composite sample will give a(n): - ANSD. Representative long-term
sample
98. Sample bottles used to collect bacteriological samples: - ANSA. Are
properly sterilized by the laboratory and are ready for use upon receipt
99. Which of the following parameters are not analyzed on wastewater
influent? - ANSB. Fecal coliforms
A ___________ is the total volume of wastewater processed through the
plant. - ANSHydraulic load
A body of a six inch gate valve has "200 WOG" inscribed on it. This means:
- ANSValve is rated for service at 200 psi for wastewater, oil or gas
A check valve's primary purpose is to: - ANSAllow flow in one direction only
A horizontal centrifugal pump has "rope" packing. When the pump is
operating, water slowly drips from the packing gland. This indicates that: -
ANSPacking bolts or nuts on the packing gland are properly adjusted
2
, A material that allows the flow of electrical current through itself is a(n): -
ANSConductor
A mixed media filter is able to remove suspended solids by using which of
the following actions? - ANSStraining
A raw sewage sample can be obtained at which of the following process? -
ANSPrimary clarifier
A simple method to measured dissolved oxygen in an aeration tank is to
use: - ANSA dissolved oxygen meter
A single sample of wastewater taken without consideration of time or flow
best describes a _______________ sample. - ANSgrab
A sludge removal method that involves the oxidation of sludge with water
and heat is called: - ANSWet air oxidation
A wastewater treatment process would not be adversely affected by which
of the following: - ANSHydraulic flows with a pH of 7-8
A well pump is connected to a bladder less pressure tank, and you notice
that it starts and stops too frequently. What could cause the pump to stop
and start frequently? - ANSAir has leaked out the tank
3
Latest 2026-2027. Questions & Correct
Verified Answers. Graded A
____________________ can be calculated by subtracting the chlorine
residual from the chlorine dosage. - ANSChlorine demand
87. When organic wastes are discharge to receiving waters, oxygen is
depleted by: - ANSB. Bacteria
88. In a manhole, the presence of hydrogen sulfide gives off an odour
similar to which of the following? - ANSC. Rotten eggs
89. Which of the following best describes coliform bacteria - ANSC.
Indicators
90. Employee hazards often found at wastewater treatment plants can
include: - ANSB. Oxygen deficiency
91. What is the percentage of solids removal achieved in primary clarifiers -
ANSD. 40 - 60
92. Three waterborne diseases can include: - ANSC. Typhoid fever,
dysentery and cholera
1
,94. Which of the following pH readings indicates an acidic wastewater
effluent? - ANSA. 3
96. At a wastewater treatment plant an outfall can be defined as which of
the following - ANSC. The discharge line leaving the plant
97. A composite sample will give a(n): - ANSD. Representative long-term
sample
98. Sample bottles used to collect bacteriological samples: - ANSA. Are
properly sterilized by the laboratory and are ready for use upon receipt
99. Which of the following parameters are not analyzed on wastewater
influent? - ANSB. Fecal coliforms
A ___________ is the total volume of wastewater processed through the
plant. - ANSHydraulic load
A body of a six inch gate valve has "200 WOG" inscribed on it. This means:
- ANSValve is rated for service at 200 psi for wastewater, oil or gas
A check valve's primary purpose is to: - ANSAllow flow in one direction only
A horizontal centrifugal pump has "rope" packing. When the pump is
operating, water slowly drips from the packing gland. This indicates that: -
ANSPacking bolts or nuts on the packing gland are properly adjusted
2
, A material that allows the flow of electrical current through itself is a(n): -
ANSConductor
A mixed media filter is able to remove suspended solids by using which of
the following actions? - ANSStraining
A raw sewage sample can be obtained at which of the following process? -
ANSPrimary clarifier
A simple method to measured dissolved oxygen in an aeration tank is to
use: - ANSA dissolved oxygen meter
A single sample of wastewater taken without consideration of time or flow
best describes a _______________ sample. - ANSgrab
A sludge removal method that involves the oxidation of sludge with water
and heat is called: - ANSWet air oxidation
A wastewater treatment process would not be adversely affected by which
of the following: - ANSHydraulic flows with a pH of 7-8
A well pump is connected to a bladder less pressure tank, and you notice
that it starts and stops too frequently. What could cause the pump to stop
and start frequently? - ANSAir has leaked out the tank
3
