ABC Wastewater Level 3 - General
Turbidity in wastewater is caused by D. finely divided suspended material
A. color
B. dissolved calcium
C. hardness
D. finely divided suspended material
The gas most commonly associated with C. hydrogen sulfide
septic wastewater is
A. carbon dioxide
B. carbon monoxide
C. hydrogen sulfide
D. methane
How many cubic meters per second in 10 A. 0.44
MGD?
A. 0.44
B. 1.44
C. 4.73
D. 24.62
, ABC Wastewater Level 3 - General
Mechanical ventilation of a lift station is C. reduce corrosion
required to
A. lower temperatures to reduce
proportion of hydrogen sulfide
B. reduce chlorine demand
C. reduce corrosion
D. increase DO in raw wastewater
A wet well probe is usually used for ________ D. single point
determination(s) of level.
A. approximate
B. dual point
C. continuous
D. single point
A pump is delivering at less than the D. discharge head too low
expected rate of discharge. Which of the
causes listed below is incorrect?
A. speed of motor too low
B. pump not primed
C. impeller clogged
D. discharge head too low
, ABC Wastewater Level 3 - General
Metal pipes often fail because of C. galvanic action
A. back siphonage
B. browning movement
C. galvanic action
D. reverse osmosis
When a fire hydrant is operated, it should B. opened fully
be
A. just opened enough to have a flow
B. opened fully
C. opened halfway
D. regulated to flow required
If the pump bearings on horizontal D. shaft or shaft sleeve will be damaged
centrifugal pumps are over lubricated,
the most important effect is that the extra
lubricant
A. will result in smoother and more
efficient operation of the pump
B. will not make any difference in the
operation of the pump
C. will be wasted
D. shaft or shaft sleeve will be damaged
, ABC Wastewater Level 3 - General
If packing is not maintained properly, C. loss of suction due to air being allowed to enter pump
A. cavitation damage will result
B. impeller will corrode
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 A. upward through the filter
influent is warmer than the air
temperature is
A. upward through the filter
B. downward through the filter
C. inadequate and may require forced air
ventilation
D. improved by decreasing the
recirculation
Turbidity in wastewater is caused by D. finely divided suspended material
A. color
B. dissolved calcium
C. hardness
D. finely divided suspended material
The gas most commonly associated with C. hydrogen sulfide
septic wastewater is
A. carbon dioxide
B. carbon monoxide
C. hydrogen sulfide
D. methane
How many cubic meters per second in 10 A. 0.44
MGD?
A. 0.44
B. 1.44
C. 4.73
D. 24.62
, ABC Wastewater Level 3 - General
Mechanical ventilation of a lift station is C. reduce corrosion
required to
A. lower temperatures to reduce
proportion of hydrogen sulfide
B. reduce chlorine demand
C. reduce corrosion
D. increase DO in raw wastewater
A wet well probe is usually used for ________ D. single point
determination(s) of level.
A. approximate
B. dual point
C. continuous
D. single point
A pump is delivering at less than the D. discharge head too low
expected rate of discharge. Which of the
causes listed below is incorrect?
A. speed of motor too low
B. pump not primed
C. impeller clogged
D. discharge head too low
, ABC Wastewater Level 3 - General
Metal pipes often fail because of C. galvanic action
A. back siphonage
B. browning movement
C. galvanic action
D. reverse osmosis
When a fire hydrant is operated, it should B. opened fully
be
A. just opened enough to have a flow
B. opened fully
C. opened halfway
D. regulated to flow required
If the pump bearings on horizontal D. shaft or shaft sleeve will be damaged
centrifugal pumps are over lubricated,
the most important effect is that the extra
lubricant
A. will result in smoother and more
efficient operation of the pump
B. will not make any difference in the
operation of the pump
C. will be wasted
D. shaft or shaft sleeve will be damaged
, ABC Wastewater Level 3 - General
If packing is not maintained properly, C. loss of suction due to air being allowed to enter pump
A. cavitation damage will result
B. impeller will corrode
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 A. upward through the filter
influent is warmer than the air
temperature is
A. upward through the filter
B. downward through the filter
C. inadequate and may require forced air
ventilation
D. improved by decreasing the
recirculation
