ABC Wastewater Level 3 – General Exam
Questions With Correct Answers
Turbidity in wastewater is caused by
| | | | |
A. color
|
B. dissolved calcium
| |
C. hardness
|
D. finely divided suspended material - CORRECT ANSWER✔✔-D. finely
| | | | | | | | |
divided suspended material
| |
The gas most commonly associated with septic wastewater is
| | | | | | | |
A. carbon dioxide
| |
B. carbon monoxide
| |
C. hydrogen sulfide
| |
D. methane - CORRECT ANSWER✔✔-C. hydrogen sulfide
| | | | | |
How many cubic meters per second in 10 MGD?
| | | | | | | |
A. 0.44
|
B. 1.44
|
C. 4.73
|
D. 24.62 - CORRECT ANSWER✔✔-A. 0.44
| | | | |
,Mechanical ventilation of a lift station is required to
| | | | | | | |
A. lower temperatures to reduce proportion of hydrogen sulfide
| | | | | | | |
B. reduce chlorine demand
| | |
C. reduce corrosion
| |
D. increase DO in raw wastewater - CORRECT ANSWER✔✔-C. reduce
| | | | | | | | | |
corrosion
A wet well probe is usually used for ________ determination(s) of level.
| | | | | | | | | | |
A. approximate
|
B. dual point
| |
C. continuous
|
D. single point - CORRECT ANSWER✔✔-D. single point
| | | | | | |
A pump is delivering at less than the 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 - CORRECT ANSWER✔✔-D. discharge head
| | | | | | | | | |
too low |
,Metal pipes often fail because of
| | | | |
A. back siphonage
| |
B. browning movement
| |
C. galvanic action
| |
D. reverse osmosis - CORRECT ANSWER✔✔-C. galvanic action
| | | | | | |
When a fire hydrant is operated, it should be
| | | | | | | |
A. just opened enough to have a flow
| | | | | | |
B. opened fully
| |
C. opened halfway
| |
D. regulated to flow required - CORRECT ANSWER✔✔-B. opened fully
| | | | | | | | |
If the pump bearings on horizontal 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 - CORRECT ANSWER✔✔-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
| | | | | | | | | | |
D. shaft or shaft sleeve will be damaged - CORRECT ANSWER✔✔-C. loss
| | | | | | | | | | | |
of suction due to air being allowed to enter pump
| | | | | | | | |
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
| | | |
C. inadequate and may require forced air ventilation
| | | | | | |
D. improved by decreasing the recirculation - CORRECT ANSWER✔✔-A.
| | | | | | | | |
upward through the filter | | |
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
| | | | | | |
C. low oxygen uptake and fast settling rate
| | | | | | |
D. low oxygen uptake and slow settling rate - CORRECT ANSWER✔✔-B.
| | | | | | | | | | |
high oxygen uptake and slow settling rate
| | | | | |
The reaction of chlorine and ammonia produces a compound which is
| | | | | | | | | | |
called
Questions With Correct Answers
Turbidity in wastewater is caused by
| | | | |
A. color
|
B. dissolved calcium
| |
C. hardness
|
D. finely divided suspended material - CORRECT ANSWER✔✔-D. finely
| | | | | | | | |
divided suspended material
| |
The gas most commonly associated with septic wastewater is
| | | | | | | |
A. carbon dioxide
| |
B. carbon monoxide
| |
C. hydrogen sulfide
| |
D. methane - CORRECT ANSWER✔✔-C. hydrogen sulfide
| | | | | |
How many cubic meters per second in 10 MGD?
| | | | | | | |
A. 0.44
|
B. 1.44
|
C. 4.73
|
D. 24.62 - CORRECT ANSWER✔✔-A. 0.44
| | | | |
,Mechanical ventilation of a lift station is required to
| | | | | | | |
A. lower temperatures to reduce proportion of hydrogen sulfide
| | | | | | | |
B. reduce chlorine demand
| | |
C. reduce corrosion
| |
D. increase DO in raw wastewater - CORRECT ANSWER✔✔-C. reduce
| | | | | | | | | |
corrosion
A wet well probe is usually used for ________ determination(s) of level.
| | | | | | | | | | |
A. approximate
|
B. dual point
| |
C. continuous
|
D. single point - CORRECT ANSWER✔✔-D. single point
| | | | | | |
A pump is delivering at less than the 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 - CORRECT ANSWER✔✔-D. discharge head
| | | | | | | | | |
too low |
,Metal pipes often fail because of
| | | | |
A. back siphonage
| |
B. browning movement
| |
C. galvanic action
| |
D. reverse osmosis - CORRECT ANSWER✔✔-C. galvanic action
| | | | | | |
When a fire hydrant is operated, it should be
| | | | | | | |
A. just opened enough to have a flow
| | | | | | |
B. opened fully
| |
C. opened halfway
| |
D. regulated to flow required - CORRECT ANSWER✔✔-B. opened fully
| | | | | | | | |
If the pump bearings on horizontal 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 - CORRECT ANSWER✔✔-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
| | | | | | | | | | |
D. shaft or shaft sleeve will be damaged - CORRECT ANSWER✔✔-C. loss
| | | | | | | | | | | |
of suction due to air being allowed to enter pump
| | | | | | | | |
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
| | | |
C. inadequate and may require forced air ventilation
| | | | | | |
D. improved by decreasing the recirculation - CORRECT ANSWER✔✔-A.
| | | | | | | | |
upward through the filter | | |
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
| | | | | | |
C. low oxygen uptake and fast settling rate
| | | | | | |
D. low oxygen uptake and slow settling rate - CORRECT ANSWER✔✔-B.
| | | | | | | | | | |
high oxygen uptake and slow settling rate
| | | | | |
The reaction of chlorine and ammonia produces a compound which is
| | | | | | | | | | |
called
