ABC Wastewater Collections Level 3 – General Combined Verified Multiple Choice and
Conceptual Actual Frequently Tested Exam Questions With Reviewed 100% Correct
Detailed Answers >> Guaranteed Pass!!Current Update!!
Turbidity in wastewater is caused by
A. color
B. dissolved calcium D. finely divided suspended material
C. hardness
D. finely divided suspended material
The gas most commonly associated with septic waste-
water is
A. carbon dioxide
C. hydrogen sulfide
B. carbon monoxide
C. hydrogen sulfide
D. methane
How many cubic meters per second in 10 MGD?
A. 0.44
B. 1.44 A. 0.44
C. 4.73
D. 24.62
Mechanical ventilation of a lift station is required to
A. lower temperatures to reduce proportion of hydrogen
sulfide
C. reduce corrosion
B. reduce chlorine demand
C. reduce corrosion
D. increase DO in raw wastewater
A wet well probe is usually used for determina-
tion(s) of level.
A. approximate
D. single point
B. dual point
C. continuous
D. single point
A pump is delivering at less than the expected rate of
discharge. Which of the causes listed below is incorrect?
, ABC Wastewater Collections Level 3 – General Combined Verified Multiple Choice and
Conceptual Actual Frequently Tested Exam Questions With Reviewed 100% Correct
Detailed Answers >> Guaranteed Pass!!Current Update!!
A. speed of motor too low
B. pump not primed
D. discharge head too low
C. impeller clogged
D. discharge head too low
Metal pipes often fail because of
A. back siphonage
B. browning movement C. galvanic action
C. galvanic action
D. reverse osmosis
When a fire hydrant is operated, it should be
A. just opened enough to have a flow
B. opened fully B. opened fully
C. opened halfway
D. regulated to flow required
If the pump bearings on horizontal centrifugal pumps are
over lubricated, the most important ettect is that the extra
lubricant
A. will result in smoother and more eflcient operation of
the pump D. shaft or shaft sleeve will be damaged
B. will not make any ditterence in the operation of the
pump
C. will be wasted
D. shaft or shaft sleeve will be damaged
If packing is not maintained properly,
A. cavitation damage will result
B. impeller will corrode C. loss of suction due to air being allowed to enter pump
C. loss of suction due to air being allowed to enter pump
D. shaft or shaft sleeve will be damaged
Air flow through a trickling filter when the influent is
warmer than the air temperature is
, A. upward through the filter
B. downward through the filter
A. upward through the filter
C. inadequate and may require forced air ventilation
D. improved by decreasing the recirculation
An active sludge in the aeration tank with an abundant
available food supply will have a relatively
A. high oxygen uptake and fast settling rate
B. high oxygen uptake and slow settling rate
B. high oxygen uptake and slow settling rate
C. low oxygen uptake and fast settling rate
D. low oxygen uptake and slow settling rate
The reaction of chlorine and ammonia produces a com-
pound which is called
A. ammonium chloride
C. chloramine
B. chloral hydrate
C. chloramine
D. hydrazine
A malfunctioning gas chlorination system has normal gas
pressure, no feed rate indicated on rotometer, and no
injector vacuum. What is the most likely cause of the
problem?
C. injector clogged
A. air leak upstream of rotameter
B. gas line plugged
C. injector clogged
D. pressure reducing valve diaphragm ruptured
What is the impact of increased viscosity on the ettective-
ness of mixed media filters?
Mixed media filters are B. less ettective
A. attected only if temperature also changes
B. less ettective
, C. more ettective
D. not attected
The precipitate in coagulation with alum is aluminum
A. bicarbonate
B. carbonate C. hydroxide
C. hydroxide
D. sulfate
Given the following data, what is the most likely cause of
the mechanically cleaned bar screen problem?
DATA: Above normal water ditterential across bar screen
Drive motor shaft turning
Drive sprocket, chain, rake not moving
Less than normal flow on bar screen downstream side
Bar screen mode selector in automatic position C. sheared pin or disengaged clutch
Normal seasonal flow (influent) coming into bar screen
Alarm systems operating normally
A. low influent (incoming) level
B. raw wastewater pumping units out of service
C. sheared pin or disengaged clutch
D. none of the above
The least amount of chemical used to remove turbidity is
known as the
A. coagulation range
D. dosage
B. combination dosage
C. eflciency range
D. dosage
The method of sludge handling resulting in a supernatant
with the highest BOD is
C. centrifugation
A. aerobic digestion
B. anaerobic digestion
Conceptual Actual Frequently Tested Exam Questions With Reviewed 100% Correct
Detailed Answers >> Guaranteed Pass!!Current Update!!
Turbidity in wastewater is caused by
A. color
B. dissolved calcium D. finely divided suspended material
C. hardness
D. finely divided suspended material
The gas most commonly associated with septic waste-
water is
A. carbon dioxide
C. hydrogen sulfide
B. carbon monoxide
C. hydrogen sulfide
D. methane
How many cubic meters per second in 10 MGD?
A. 0.44
B. 1.44 A. 0.44
C. 4.73
D. 24.62
Mechanical ventilation of a lift station is required to
A. lower temperatures to reduce proportion of hydrogen
sulfide
C. reduce corrosion
B. reduce chlorine demand
C. reduce corrosion
D. increase DO in raw wastewater
A wet well probe is usually used for determina-
tion(s) of level.
A. approximate
D. single point
B. dual point
C. continuous
D. single point
A pump is delivering at less than the expected rate of
discharge. Which of the causes listed below is incorrect?
, ABC Wastewater Collections Level 3 – General Combined Verified Multiple Choice and
Conceptual Actual Frequently Tested Exam Questions With Reviewed 100% Correct
Detailed Answers >> Guaranteed Pass!!Current Update!!
A. speed of motor too low
B. pump not primed
D. discharge head too low
C. impeller clogged
D. discharge head too low
Metal pipes often fail because of
A. back siphonage
B. browning movement C. galvanic action
C. galvanic action
D. reverse osmosis
When a fire hydrant is operated, it should be
A. just opened enough to have a flow
B. opened fully B. opened fully
C. opened halfway
D. regulated to flow required
If the pump bearings on horizontal centrifugal pumps are
over lubricated, the most important ettect is that the extra
lubricant
A. will result in smoother and more eflcient operation of
the pump D. shaft or shaft sleeve will be damaged
B. will not make any ditterence in the operation of the
pump
C. will be wasted
D. shaft or shaft sleeve will be damaged
If packing is not maintained properly,
A. cavitation damage will result
B. impeller will corrode C. loss of suction due to air being allowed to enter pump
C. loss of suction due to air being allowed to enter pump
D. shaft or shaft sleeve will be damaged
Air flow through a trickling filter when the influent is
warmer than the air temperature is
, A. upward through the filter
B. downward through the filter
A. upward through the filter
C. inadequate and may require forced air ventilation
D. improved by decreasing the recirculation
An active sludge in the aeration tank with an abundant
available food supply will have a relatively
A. high oxygen uptake and fast settling rate
B. high oxygen uptake and slow settling rate
B. high oxygen uptake and slow settling rate
C. low oxygen uptake and fast settling rate
D. low oxygen uptake and slow settling rate
The reaction of chlorine and ammonia produces a com-
pound which is called
A. ammonium chloride
C. chloramine
B. chloral hydrate
C. chloramine
D. hydrazine
A malfunctioning gas chlorination system has normal gas
pressure, no feed rate indicated on rotometer, and no
injector vacuum. What is the most likely cause of the
problem?
C. injector clogged
A. air leak upstream of rotameter
B. gas line plugged
C. injector clogged
D. pressure reducing valve diaphragm ruptured
What is the impact of increased viscosity on the ettective-
ness of mixed media filters?
Mixed media filters are B. less ettective
A. attected only if temperature also changes
B. less ettective
, C. more ettective
D. not attected
The precipitate in coagulation with alum is aluminum
A. bicarbonate
B. carbonate C. hydroxide
C. hydroxide
D. sulfate
Given the following data, what is the most likely cause of
the mechanically cleaned bar screen problem?
DATA: Above normal water ditterential across bar screen
Drive motor shaft turning
Drive sprocket, chain, rake not moving
Less than normal flow on bar screen downstream side
Bar screen mode selector in automatic position C. sheared pin or disengaged clutch
Normal seasonal flow (influent) coming into bar screen
Alarm systems operating normally
A. low influent (incoming) level
B. raw wastewater pumping units out of service
C. sheared pin or disengaged clutch
D. none of the above
The least amount of chemical used to remove turbidity is
known as the
A. coagulation range
D. dosage
B. combination dosage
C. eflciency range
D. dosage
The method of sludge handling resulting in a supernatant
with the highest BOD is
C. centrifugation
A. aerobic digestion
B. anaerobic digestion
