Reference no: EM132439026
Questions -
1) What may cause temporary cloudiness in a freshly drawn sample of tap water?
i) Air
ii) Carbon dioxide
iii) Chlorine
iv) Hardness
2) Back siphonage occurs when
i) Vacuum Condition exists
ii) Pressure increases
iii) An interconnection is made between the plumbing system in the building and water supply
iv) AN open end of a water supply pipe is discharged in the plumbing fixtures
3) A particular electric motor is wound for the three-phase current. If one phase cuts out while the motor is in operation, the motor may
i) Continue to run without danger and will do a normal amount of work
ii) Continue to run without danger, but the work done will be reduced one-third.
iii) Heat up and be damaged unless it is stopped by a thermal control device
iv) Stop immediately
4) What is the safe procedure for handling a 150-pound chlorine cylinder?
i) Keep the cylinder close to direct heat to prevent freezing
ii) Place a protective cap on the cylinder when moving it
iii) Roll the cylinder in a horizontal position
iv) Store the cylinder on its side
5) How does the addition of chlorine gas to water affect the PH?
i) It remains the same
ii) Lowers the PH
iii) Lower or raises the PH depending on conductivity
iv) Raises the PH
6) If valves are opened or closed too rapidly, there is a risk of
i) Backflow
ii) Cavitation
iii) Tuberculation of the mains
iv) Water Hammer
7) According to the Federal Safe Drinking Water Act Total Coliform Rule, bacteriological samples should be analyzed within what timeframe of the sample time?
i) 18 hours
ii) 30 hours
iii) 2 days
iv) 3 days
8) A deep well turbine is best described as a
i) Hydraulic ram
ii) Jet pump
iii) Line shaft
9) For a centrifugal pump in good condition, the maximum gravitational suction lift is
10) A water plant adjusts the fluoride level. Where should fluoride process control samples be collected?
a) Plant finished water
b) At the system bacteriological samples site
c) At a site representing the distribution system's longest residence time
d) At a site representing the distribution system's mean average residence time
11) What is venturi, propeller, ultrasonic and magnetic meters used to measure?
a) Flow
b) Level
c) Pressure
d) Turbidity
12) When an operator is working on any piece of electrical equipment, the circuit breaker should be
a) Closed
b) Locked out and tagged
c) Open
d) Tagged
13) An operator needs to disinfect a water supply with chlorine and maintain a residual of 0.4mg/L. The chlorine demand of the water is 0.25mg/L. The flow through the plant is 5 MGD. The chlorinator setting should be
a) 6.3 lbs./day
b) 10.4 lbs./day
c) 16.7 lbs./day
d) 27.1 lbs./day
14) Vertical turbine pump bowls are usually fitted with
a) Drive shafts
b) Impellers
c) Supporting bearings
d) Thrust collars
15) Why is the maximum concentration for fluoride temperature dependent?
a) Fluoride boils off higher concentration
b) Fluoride is harder to dissolve in water at higher temperature
c) People drink more water when the outside temperature is hotter
d) Fluoride is harder to dissolve in water at higher temperatures
16) According to the Federal Safe Drinking Water Act, locations in the distribution system for monitoring disinfection by-products must include a sample representing
a) Lowest chlorine residual
b) Highest chlorine residual
c) Minimum residence time
d) Maximum residence time
17) What is the main cause of methemoglobinemia (blue baby syndrome)?
a) Boron
b) Fluoride
c) Nitrate
d) Phosphate
18) A centrifugal pump with a positive head on the suction side does not need to be
a) Checked
b) Primed
c) Started
d) Valved
19) Which of the following describes the best way to stop a chlorine leak at a valve stem?
a) Tighten the flange bolt
b) Tighten the packing nut
c) Patch the leak with solder
d) Patch the leak with a rubber patch kit
20) Fluoride dosage in the excess of 2 mg/L will
a) Waste money and can cause health problem
b) Reduce the effectiveness and create chlorine demand
c) Improve the filtration and taste of finished water
d) Cause slight pink coloration in water at higher temperatures
21) Air release valves should be located at the top of the water line and at which other points in the line?
a) Every mile
b) Low points
c) High Points
d) River/stream crossings
22) What condition are the most likely to corrode steel?
a) Acid conditions
b) Dry conditions
c) Lack of oxygen
d) Neutral conditions
23) An acceptable method of disinfecting the interior of a water storage tank after it has been removed for inspection is to spray the interior walls with a _ chlorine solution.
a) 1mg/L
b) 2 mg/L
c) 10 mg/L
d) 200 mg/L
24) The pressure of 9 inches of water is
a) 0.32 psi
b) 2.08 psi
c) 3.08 psi
d) 3.90 psi
25) Which of the following qualities is most important when determining if a water is safe to drink?
a) Absence of coliform organisms
b) Clarity
c) Absence of undesirable odor
d) Taste
26) Under the Total Coliform rule, a system is required to collect two bacteriological samples per month. These must come from
a) Both the Raw source and distribution system
b) Either the source or the distribution system
c) The distribution system
d) The source
27) The most important characteristic of a lubricant is its
a) Flash point
b) Pour point
c) Viscosity
d) Viscosity index
28) Which of the following describes the correct repeat sampling procedure required upon the receipt of a positive coliform result during routine bacteriological water sampling?
a) Collect 3 repeat samples from the same location as a positive sample, 1 on each of 3 consecutive days
b) Collect 1 sample from the same location as the positive sample, a second sample from a location within 5 connections upstream, and a 3rd sample from a location within 5 connections downstream
c) Collect 3 repeat samples from the same location as the positive sample, all on the same day
d) Collect 1 sample from the same location as the positive sample, a 2nd sample from a location within 5 connections upstream, and a 3rd sample from a location within 5 connections downstream, 1 on each of 3 consecutive days
29) The static pressure in a pipeline is 120 psi. How much head creates that pressure?
a) 51.9 ft
b) 60.0 ft
c) 277.2 ft
d) 900.0 ft
30) What is the preferred method for entering a room where a chlorine gas leak has occurred?
a) Hold your breath and work quickly
b) Turn on a fan for 10 minutes before entering
c) Use a canister-type respirator
d) Use a self -contained breathing apparatus with full face piece
31) AN oxidant used to reduce THM formation during the pretreatment of waters with high organic substance levels is
a) Potassium Magnate
b) Sodium Chlorate
c) Chlorine dioxide
d) Activated Silica
32) Which of the following information should always be included on a sample label?
a) Name or initials of the person running the analysis
b) Weather conditions when the sample was collected
c) Date, time, and location of the sample collection
d) Name and address of treatment facility
33) Which of the following kills bacteria the most rapidly?
a) Chloramine
b) Combined available chlorine
c) Free available chlorine
d) Potassium permanganate
34) What do the subsurface component parts of a well include?
a) Pump motor base seal
b) Sampling taps
c) Well-casing vent
d) Well screen
35) What is the one reason that coliform group bacteria are used in determining the bacteria in water
a) Disease-producing organisms are not easily isolated and identified
b) They are not affected by chlorine
c) They are not pathogenic
d) They can be seen by human eye
36) Friction in a pipeline cause
a) Contamination
b) Cavitation
c) Loss of pressure
d) Overheating
37) According to the Federal Safe Drinking Water Act, the CT formula for drinking water disinfection refers to the
a) Contaminant's concentration in mg/L multiplied by temperature
b) Concentration of disinfecting agent in mg/L multiplied by the disinfecting time
c) Turbidity concentration in standard turbidity units multiplied by time
d) Copper-trihalo method reaction which leads to toxic by-products
38) Steel water storage tanks can be best protected from corrosion by
a) Anodic protection
b) Cleaning and polishing yearly
c) Grounding copper rods
d) Cathodic protection
39) Why should a free chlorine residual be maintained in the distribution system even when a good bacteriological record?
a) Contamination may enter the system at anytime
b) The consumers feel much better
c) It prevents red water
d) It prevents rust from forming in the system
40) A flow meter reads 0005678 gallons on one Monday and 0356098 gallons on the following Monday. What is the average daily flow?
a) 35,042 gpd
b) 43,802 gpd
c) 50,060 gpd
d) 350,420 gpd
41) Under normal temperature conditions, what is the maximum continuous withdrawal rate of chlorine gas from a single m150 pound cylinder without frosting?
a) 2 lbs./day
b) 10 lbs./day
c) 40 lbs./day
d) 150 lbs./day
42) How many gallons does 600 feet of 6-inch pipe hold?
a) 740 gallons
b) 883 gallons
c) 900 gallons
d) 934 gallons
43) If six wells are producing at the rate, in gpm of 900, 1,200, 700, 1,000, 600 and 1,500 what is the average daily water production per well?
a) 0.68 MGD
b) 1.21 MGD
c) 1.42 MGD
d) 8.50 MGD
44) A hydropneumatics (pressure)tank used for storage on a small water supply has an effective or usable capacity of 6,000 gallons of water. The average water demand of the supply is 300 gpm. During a power outage, if the demand does not change, the 6,000 gallons of water in the tank would last
a) 10 minutes
b) 20 minutes
c) 200 minutes
d) 300 minutes
45) A special type of face and eye protection is required for
a) Chipping
b) Drilling
c) Grinding
d) Welding
46) The effectiveness of Free Chlorine used as a disinfectant is dependent upon
a) Temperature and fluoride concentration
b) PH and hardness
c) Alkalinity and nitrate concentration
d) Temperature and PH levels
47) The two most common method of adjusting chemical feed pumps are through adjustment of the pump
a) Diaphragm and rotator
b) Ball check valve and air relief valve
c) Antisiphon valve and back pressure valve
d) Stroke and Speed
48) What should an Operator do before using a PH meter to obtain reliable results?
a) Calibrate the PH meter
b) Change the electrode membranes
c) Replace electrode
d) Remove the electrode and store them in a sample
49) The discharge pressure gauge on a pump reads 23 psi. What is the discharge head?
a) 10 ft
b) 23 ft
c) 33 ft
d) 53 ft
50) What can be done to protect chemical deliveries from being a possible source of terrorist activity?
a) Material Safety Data Sheet presented by driver with each delivery
b) Tank truck chemical deliveries eliminated in favor of sealed drums
c) Vendor provided certificate of analysis of the product from its storage location
d) Vendor identification of drivers provided prior to delivery
51) What is the per capita production during a 24-hour operation if a plant produces 3,000 gallons a minute for a community of 27,000?
a) 100 gpcd
b) 110 gpcd
c) 120 gpcd
d) 160 gpcd
52) Which of the following is the most accurate type of dry feeder?
a) Rotameter
b) Feed screen
c) Gravimetric
d) Rate -of-flow
53) Unsafe chemical storage and handling practices include
a) Knowledge and training
b) Labeling
c) Protective clothing
d) Storing all chemicals together in the same room
54) What is the detention time in a storage tank 20 feet high and 30 feet in diameter when the rate of flow is 5000,000 GPD?
a) 2 hrs., 10 mins
b) 3 hrs., 48 min
c) 4 hrs., 27 min
d) 5 hrs., 4 min
55) If fluoride is added to a water supply, the operator should test the fluoride concentration in the water
a) Daily
b) Monthly
c) Weekly
d) Yearly
56) A cylindrical tank is 20 feet in diameter and 40 feet tall and full. If the tank is now 50% full, how many gallons of water have been used?
a) 6,280 gallons
b) 47,100 gallons
c) 94,040 gallons
d) 188,550 gallons
57) What is proper maintenance for the packing around the shaft of a centrifugal pump?
a) The packing should be oiled weekly
b) The packing should be allowed to dry completely at least once a year
c) The packing should be replaced once a month
d) The packing should be tightened just enough to allow a slow drip of seal water to escape
58) Which of the following is the best way to increase the dosage of any liquid chemical?
a) Increase the number of strokes/minutes of the chemical feed pump
b) Increase the stroke length of the Gravimetric feeder
c) Increase the volume of the hopper on the gravimetric feeder
d) Chemical dosages don't need to be changed
59) Water flows in pipes under pressure are measured using
a) Orifice meters
b) Palmer-Bowlus flumes
c) Parshall flumes
d) Weirs
60) If hard water is used to prepare a fluoride solution in a container, what would be the results?
a) Fluoride ions precipitating in the filtration stage
b) Improper saturation with fluorotic acid
c) Severe scaling of the equipment
d) Sodium fluoride combining with calcium, thus forming a weaker solution
61) Well water is normally
a) Low in mineral content
b) Of a consistent quality
c) Considered soft
d) High in nitrate
62) At what temperature will a chlorine gas cylinder fusible plug release chlorine into the atmosphere?
a) 115 F - 120 F
b) 130 F - 140 F
c) 155 F - 165 F
d) 210 F - 215 F
63) In the collection of a sample for bacteriological analysis, the sample container should always be
a) Colored
b) Metal
c) Plastic
d) Sterile
64) Before working on a chemical feed pump or motor, an operator should do the following
a) Lock and tag out all energy sources that supply power to the piece of equipment
b) Call the pump manufacturer to discuss the repairs to be made
c) Verify that the pump has either a mechanical seal or packing
d) Set and lock the pump speed so chemical feed is not interrupted while repairs are being made
65) Protective clothing required for performing routine preventative maintenance procedures on dry fluoride feeders includes
a) Decontamination clothing
b) Dust mask and googles
c) Self-contained air packed and rubber suit
d) None, there are no safety hazards
66) What does adding more stages to a well pump increase?
a) Suction lift
b) Discharge velocity
c) Discharge pressure
d) Discharge GPM
67) Fluoride is added to drinking water for the purpose of
a) Corrosion control
b) Disinfection
c) Prevention of dental cavities
d) Sequestering iron
68) Which of the following is the safest way to prepare acid solutions?
a) Always add the acid to the water
b) Always add the water to the acid
c) Always mix the equal amounts
d) Always add water to the acid while stirring mixture
69) Chemical storage tanks should be protected from ultraviolet sun rays to prevent
a) Biological activity
b) Chemical dilution
c) Chemical solution deterioration
d) Algae growth
70) The presence of coliform bacteria indicates
a) The water will positively cause disease
b) Pathogenic bacteria may be present
c) The chlorine residual is not effective
d) Fish kills will occur
71) Because it permits flow only in one direction, which valve would help determine the dimension of fluid flow?
a) Butterfly valve
b) Check valve
c) Pressure valve
d) Relief valve
72) Where should the lantern ring be installed?
a) Over the stuffing box gland to prevent dust and dirt from entering the stuffing box
b) Between the packing rings at the sealing water connection
c) At the bottom of the stuffing box before any packing rings
d) Over the last packing ring before the stuffing box gland
73) What does organic material have on chlorination?
a) No effect
b) Decreases chlorine demand
c) Increases chlorine demand
d) Decease THM formation