Wastewater Treatment Operator Certification Test #4 Questions with Verified Answers|
Latest Update Graded A+
1 mg/l is the same as 1 part per billion (ppb)
True or False False (v.1 pg 468)
What should be done to a chlorine container if liquid chlorine is leaking?
A) Turn it over so that the leaking side is on the bottom to seal the leak
B) Turn it to the side
C) Apply water on the chlorine leak to slow down the leakage
D) Turn it over so that the leaking side is on the top D) Turn it over so that the leaking side is
on the top (v.1 pg 388)
In a domestic wastewater system, how many pounds of oxygen are used each day by the
microorganisms for each person using the system?
A) 1.3 lb/day/person
B) 0.17 lb/day/person
C) 2.4 lbs/day/person
D) 3.5 lbs/day/person B) 0.17 lb/day/person (v.1 pg 326)
What terminology indicates the time required to fill a basin at a given flowrate?
A) Detention time
B) Short-Circuiting
C) Hydraulic loading rate
D) Weir overflow rate A) Detention time (v.1 pg 513)
,What could happen if the intake of a progressing cavity pump in not kept wet?
A) Increase in head
B) Damage to pump
C) Slight decrease in flowrate
D) Incremental increase in pressure B) Damage to pump
How should you operate an anaerobic digester?
A) The rate of acid formation is more than the methane formation
B) The rate of acid formation is less than the methane formation
C) The rate of acid formation and methane formation are approximately equal
D) The rate of acid formation is predominant and methane formation is negligible C) The
rate of acid formation and methane formation are approximately equal (v.2 pg 148)
What is the purpose of a check valve?
A) To isolate a clarifier for maintenance
B) To stop flow from entering the headworks
C) To throttle flow by turning the nut
D) Prevent liquid form flowing in the reverse direction D) Prevent liquid form flowing in the
reverse direction (v.2 pg 369)
Which of the following is the best way to detect oxygen deficiency in a confined space?
A) Reliable and calibrated gas monitor/detector
B) Check for odor
C) Colormetric test
, D) DPD A) Reliable and calibrated gas monitor/detector (v.2 pg 267)
What should be done if filamentous organisms become a problem in the mixed liquor?
A) Lower the pH to 5
B) Lower the MCRT to less than 4 days
C) Decrease sludge return rate and increase wasting
D) Increase DO in aeration tank D) Increase DO in aeration tank (v.2 pg 74)
What is the solids content of a good, thick primary sludge?
A) 0.1 to 0.8% dry solids
B) 1 to 2.5% dry solids
C) 4 to 8% dry solids
D) 8 to 10% dry solids C) 4 to 8% dry solids (v.1 pg 130)
What must be done if you get chlorine in your eyes?
A) Wash eyes with HCl
B) Chlorine must be flushed immediately with large amounts of lukewarm water
C) Flush eyes with aqueous ammonia
D) Apply saline solution to affected eyes B) Chlorine must be flushed immediately with large
amounts of lukewarm water (v.1 pg 377)
A SCADA system is capable of monitoring and controlling equipment from a remote location
True or False True (v.2 pg 627)
Latest Update Graded A+
1 mg/l is the same as 1 part per billion (ppb)
True or False False (v.1 pg 468)
What should be done to a chlorine container if liquid chlorine is leaking?
A) Turn it over so that the leaking side is on the bottom to seal the leak
B) Turn it to the side
C) Apply water on the chlorine leak to slow down the leakage
D) Turn it over so that the leaking side is on the top D) Turn it over so that the leaking side is
on the top (v.1 pg 388)
In a domestic wastewater system, how many pounds of oxygen are used each day by the
microorganisms for each person using the system?
A) 1.3 lb/day/person
B) 0.17 lb/day/person
C) 2.4 lbs/day/person
D) 3.5 lbs/day/person B) 0.17 lb/day/person (v.1 pg 326)
What terminology indicates the time required to fill a basin at a given flowrate?
A) Detention time
B) Short-Circuiting
C) Hydraulic loading rate
D) Weir overflow rate A) Detention time (v.1 pg 513)
,What could happen if the intake of a progressing cavity pump in not kept wet?
A) Increase in head
B) Damage to pump
C) Slight decrease in flowrate
D) Incremental increase in pressure B) Damage to pump
How should you operate an anaerobic digester?
A) The rate of acid formation is more than the methane formation
B) The rate of acid formation is less than the methane formation
C) The rate of acid formation and methane formation are approximately equal
D) The rate of acid formation is predominant and methane formation is negligible C) The
rate of acid formation and methane formation are approximately equal (v.2 pg 148)
What is the purpose of a check valve?
A) To isolate a clarifier for maintenance
B) To stop flow from entering the headworks
C) To throttle flow by turning the nut
D) Prevent liquid form flowing in the reverse direction D) Prevent liquid form flowing in the
reverse direction (v.2 pg 369)
Which of the following is the best way to detect oxygen deficiency in a confined space?
A) Reliable and calibrated gas monitor/detector
B) Check for odor
C) Colormetric test
, D) DPD A) Reliable and calibrated gas monitor/detector (v.2 pg 267)
What should be done if filamentous organisms become a problem in the mixed liquor?
A) Lower the pH to 5
B) Lower the MCRT to less than 4 days
C) Decrease sludge return rate and increase wasting
D) Increase DO in aeration tank D) Increase DO in aeration tank (v.2 pg 74)
What is the solids content of a good, thick primary sludge?
A) 0.1 to 0.8% dry solids
B) 1 to 2.5% dry solids
C) 4 to 8% dry solids
D) 8 to 10% dry solids C) 4 to 8% dry solids (v.1 pg 130)
What must be done if you get chlorine in your eyes?
A) Wash eyes with HCl
B) Chlorine must be flushed immediately with large amounts of lukewarm water
C) Flush eyes with aqueous ammonia
D) Apply saline solution to affected eyes B) Chlorine must be flushed immediately with large
amounts of lukewarm water (v.1 pg 377)
A SCADA system is capable of monitoring and controlling equipment from a remote location
True or False True (v.2 pg 627)
