Test
Class C Wastewater Treatment Plant Operator Questions
Preguntas del test (45)
1pH is the measure of
- AAmount of an acid
- BIntensity of basic or acidic condition of a liquid
- CAcidity
- DAlkalinity
2The second stage of anaerobic digestion is called
- AAcid formation
- BStabilization
- CMethane formation
- DPathogenic formation
3One liter of elemental liquid chlorine can evaporate and produce how many liters of chlorine gas
- A100
- B250
- C457
- D567
4Chlorine gas is how many times heavier than air?
- A1 times
- B2.5 times
- C7 times
- D25 times
5PLANT PROBLEM: Plant effluent coliform count fails to meet required standards for disinfection. Chlorine residual is normal. Disinfection supplies are not a problem.
- ACapacity of chlorinator too low
- BToo little solids in effluent
- CContact time too short
- DChlorine demand too high
6The most important adjustments to the activated sludge process are made by adjusting
- AAeration, pH, and RAS
- BAeration, pH and WAS
- CRAS, WAS and aeration
- DpH, RAS and WAS
7Problem: Classic sludge bulking occurring in the final clarifier of a conventional activated sludge plant. Indicators include solids pouring over the weirs, excessive floc observed at the surface, and a homogenous sludge blanket appearing throughout the clarifier. Sludge in settling test settles slowly leaving a cloudy supernatant. What is the MOST probable cause?
- AOver-oxidized sludge
- BHydraulic washout
- CYoung sludge
- DSVI too low
8PROBLEM: Operational data is given below for a primary clarifier:
Influent flow: 2.5 mgd
Primary tank volume: 41,310 cubic feet- A0.3 hours
- B3.0 hours
- C13.0 hours
- D16.8 hours
9As the operator of a primary clarifier, you notice black and odorous septic wastewater leaving the clarifier. What is the probable cause?
- AWithdrawing sludge too frequently
- BImproper sludge removal
- CExcessive I&I entering WWTP
- DExcessive oil and grease entering WWTP
10PROBLEM: Plant fecal coliform counts do not meet State standards. The chlorine supply is not the problem, there is adequate vacuum and chlorine feed. The chlorine contact tank has no solids build-up and the effluent flow is below design. That is the MOST likely cause?
- AHigh chlorine demand from excessive ammonia in effluent
- BHigh chlorine demand from excessive nitrate in effluent
- CHigh chlorine demand from excessive nitrite in effluent
- DHigh chlorine demand from excessive polymer in effluent
11A fixed sample is
- ANot broken
- BA sample purposely 'spiked' by the lab technician for QA/QC
- CA series of composite samples
- DA sample preserved in the field upon completion
12According to FDEP Chapter 62-602 FAC, an operator could have his/her license permanently revoked for
- AFalsified or misrepresented reports, logs or lab sheets
- BCheating on an exam
- CIncompetence in operation of a wastewater treatment plant
- DSubmitting false data on license application
13PROBLEM: Excessive white, billowing foam in the aeration tank surface.
- ApH too high
- BMLSS too low
- CWaste temperature too high
- DWAS too low
14According to Chapter 62-620 FAC, Wastewater Permitting, plant records must be maintained on-site for how many years?
- AOne year
- BThree years
- CFive years
- DForever
15What happens in the stabilization (re-aeration) tank in the contact-stabilization process?
- AAdsoption of the activated floc
- BAdsorption of waste material by microorganisms
- CAgglomeration of the activated floc
- DAdsorption and digestion of the waste material collected by microorganisms
16PROBLEM: Good settling in the 30 minute settleability test. Excessive floc billowing in the clarifier and washing out. Sludge scrapers and RAS system appear normal. What is the BEST solution to fix the problem?
- ALower aeration tank effluent weirs
- BIncrease RAS
- CAdd chlorine to RAS
- DReduce clarifier hydraulic loading rates.
17PROBLEM: Classic sludge bulking occurring in the final clarifier of a conventional activated sludge plant. Indicators include solids pouring over the weirs, excessive floc observed at the surface, and a homogenous sludge blanket appearing throughout the clarifier. Sludge in settling test settles slowly leaving a cloudy supernatant. What is the necessary check to confirm the cause?
- AWeir over flow rate
- BDetermine effluent suspended solids concentration
- CCalculate the sludge age
- DDO in the aeration tank
18In a well operated activated sludge plant, when the RAS rate is decreased but the WAS rate remains constant, the expected conditions would be
- AMLSS decreases, F/M Ration increases, MCRT decreases
- BMLSS decreases, F/M Ration decreases, MCRT increases
- CMLSS increases, F/M Ration increases, MCRT decreases
- DMLSS increases, F/M Ration decreases, MCRT increases
19The first step in anaerobic digestion is called
- AAcid formation
- BStabilization
- CMethane formation
- DAlkalinity formation
20A screenings dumpster is full at the headworks of the treatment plant. The dumpster is 6 ft tall, 10 ft long and 8 ft wide. How many cubic yards of screenings myst be disposed of.
- A17.8
- B129.6
- C480.0
- D575.0
21The two main gases formed in the anaerobic digestion process are
- ANitrogen and oxygen
- BMethane and oxygen
- CMethane and water
- DMethane and carbon dioxide
22In an activated sludge plant, if the DO in the aeration tank suddenly decreases and the aerators are not the problem, what is the most probable cause
- AF/M Ratio decreased
- BIncreased organic load into tank
- CDenitrification occuring
- DMCRT too long
23How many fusible plugs can be found on a one-ton chlorine container?
- A1
- B2
- C6
- DThere are no fusible plugs on a one-ton container
24A fire has started in the maintenance shop due to an ignition of petroleum oil. Which type of fire extinguisher should not be used to fight the fire?
- ACO2
- BPurple K
- CPressurized water
- DDry chemical
25Mixing dry granular chlorine with petroleum products will
- ACreate anhydrous chlorine dioxide
- BCreate an explosive device
- CCreate hydrogen dioxide
- DCreate a white cloud
26A confined space is defined as having a space large enough to bodily enter and perform work, has limited entry and egress and is _______________ ?
- ANot designed for continuous occupancy
- BDesigned for state exam prep classes
- CNot designed to perform strenuous computer calculations
- DDesigned as a long term hurricane and tornado shelter
27What is the dosage of chlorine, in mg/L, if the flow being treated is 85,000 gpd and 3 pounds of chlorine are used per day?
- A0.42 mg/L
- B1.4 mg/L
- C2.3 mg/L
- D4.2 mg/L
28When properly adjusted, the rope packing on a centrifugal pump is designed to leak how much?
- AOne drip per second
- BOne drip per hour
- CA steady, pencil sized stream should flow at all times
- DThere should be NO leaks from a rope packing
29In a lab, a dilute acid solution must be prepared for titration in the alkalinity test. The proper procedure for making the weak acid is to:
- AAdd the water slowly to the concentrated acid to begin dilution
- BAdd the water quickly to the acid to begin dilution
- CAdd the acid directly to the sample without dilution
- DAdd the acid slowly to the dilution water
30What is the removal efficiency of the solids contact/trickling filter process if the influent TSS is 439 mg/L and the plant effluent TSS is 4.0 mg/L?
- A4%
- B40%
- C89%
- D99%
31As an operator of a gravity thickener, you notice floating sludge rising throughout the thickener. All of the following may be a cause for the problem EXCEPT
- ASludge decomposing in the tank
- BSludge collection mechanism is off
- CInsufficient sludge removal
- DSludge blanket too low
32PROBLEM: Upon arriving at the package treatment plant serving a small community, you find a uniform sludge blanket rising throughout the clarifier. A settlettling sludge leaving a clear supernatant. MLSS test results are normal, but a calculation of the SVI shows a high sludge volume indability test reveals a very slow seex. What is the MOST likely cause of the high sludge blanket ?
- AThe operator has wasted too much sludge, causing a young sludge condition
- BAn extreme rain event washed out the majority of the solids
- CFilamentous bacteria are causing the slow settling
- DAn overdose of chlorine has killed the floc forming and filament bacteria
33PROBLEM: Solids are washing out of the secondary clarifier of the activated sludge
plant. Plant personnel increase the return activated sludge (RAS) flow rate,
which slows the problem temporarily, but gets worse after 30 minutes.
What is the cause of the plant problem?- AIncreasing the RAS increased the detention time in the clarifier
- BIncreasing the RAS decreased the detention time in the clarifier
- CIncreasing the RAS increased the detention time in the aeration
tank - DIncreasing the RAS caused the DO in the aeration tank to increase
34PROBLEM: Solids are washing out of the secondary clarifier of the activated sludge plant. A settleability test shows good settling CAN occur. The MOST likely cause of the problem is:
- AHigh flows are entering the treatment plant
- BThe RAS rate is too low
- CDenitrification is occurring in the chlorine contact tank
- DThe sludge collector mechanism is rotating clockwise
35PROBLEM: The chlorine residual is falling, and inspection of the 150 lb cylinder and chlorine feed equipment shows ice forming on the chlorine regulator and feed lines. The BEST method to fix the falling chlorine residual is:
- Aswitch over to sodium hypochlorite solution
- Bplace a second chlorine cylinder on-line
- Croll the cylinder so liquid is feeding instead of gas
- Dplace a 1500W space heater next to the cylinder to thaw the ice
36The fusible plug on a chlorine cylinder is designed to:
- AMelt at 1500 degrees F
- BPrevent a dangerous vacuum from forming in the cylinder
- CMelt at 158-165 degrees F
- DMelt when placed in the direct sunlight
37How many times heavier than air is methane gas?
- A1 time
- B2.5 times
- C4.6 times
- DMethane is lighter than air
38The combination of methane and _____________ can be very combustible?
- ACarbon monoxide
- BCarbon dioxide
- CCarbon tetrazini
- DOxygen
39A class C fire extinguisher is safe to use of what type of fire?
- AOrdinary paper, wood and trash
- BFlammable fuels
- CElectrical equipment
- DFlammable metals
40F/M Ratio can be BEST be described as:
- AThe pounds of CBOD applied to a pound of MLVSS
- BThe amount of influent TSS applied to the aeration tank
- CThe loading of solids to a trickling filter
- DThe amount of soluble CBOD fed to an RBC
41According to FDEP chapter 62-601, FAC, a composite sample shall be used for which test?
- ATotal chlorine residual
- BEffluent CBOD
- CEffluent pH
- DEffluent fecal coliform
42According to FDEP chapter 62-604.550 (a) FAC, a wastewater spill shall be verbally reported to the state warning point no later than:
- A8 hours from discovery
- B12 hours from discovery
- C24 hours from discovery
- D72 hours from discovery
43According to F DEP chapter 62-600.440 (4)(b), basic disinfection is
described as:- AA chlorine residual of 0.5 mg/L for 30 minutes at peak hourly flow
- BA chlorine residual of 1.0 mg/L for 15 minutes at peak hourly flow
- CA chlorine residual of 0.5 mg/L for 15 minutes at peak hourly flow
- DA chlorine residual of 0.5 mg/L for 30 minutes at average daily flow
44According to FDEP chapter 62-600.440 (4)(c) 4, basic level disinfection, any ONE sample may not exceed how many colonies per 100 ml sample?
- A100
- B200
- C500
- D800
45The preservative used for transport of the fecal coliform sample is:
- AIce the sample for no less than 6 hours minimum
- BIce to 4 degrees C
- C0.5% nitric acid
- D0.2% sulfuric acid
Información
- Descripción
- Wastewater Wastewater Treatment Study Material Test sobre Class C Wastewater Treatment Plant Operator Questions, creado por Dean Lampman el 29/12/2017.
- Autor
- Dean Lampman
- Idioma
- English
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- Historial
- Creado el 29 dic 2017 · actualizado el 29 jun 2021
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