Lab
The nephelometric method is used to measure:
A. Suspended solids
B. Lead and copper
C. Alkalinity
D. Turbidity
D. Turbidity
Sedimentation is a process that _____ suspended matter:
A. Settles
B. Coagulates
C. Flocculates
D. Filters
A. Settles
In water distribution systems, what is the primary concern when entering a confined
space?
A. Explosive conditions
B. Flammable conditions
C. Oxygen deficiency
D. Toxic gases
D. Toxic gases
Which of the following is not a type of a pump:
A. Centrifugal
B. Jet
C. Positive displacement
D. Reduction
D. Reduction
Which source of water has the greatest natural protection from bacterial contamination?
A. Shallow well
B. Deep well in gravel
C. Surface water
D. Spring
B. Deep well in gravel
What is the most common method used in labs to test for total coliform and E. coli?
A. Green
B. DMA
C. Colilert
D. Lamp
C. Colilert
How does a coagulant cause the formation of floc during the coagulation process?
A. Through a physical and chemical reaction with colloids in the water
B. Through a physical mixing process
C. Through an interaction of plant processes and additions
D. Through a separation process of colloids
A. Through a physical and chemical reaction with colloids in the water
What is the safest method of storing oily rags?
A. Hang on a hook outside
B. Place in an open container
C. Place in a covered metal container
D. Place in a wooden barrel
C. Place in a covered metal container
The aquaphone and geophone are two mechanical devices that are used:
A. By tank inspection divers to communicate with each other and observers on the surface
B. By customer service representatives to automatically read meters from a distance
C. As acoustic listening devices to detect sound waves created by escaping water
D. At remote pumping stations and reservoirs to alert operators to mechanical problems
C. As acoustic listening devices to detect sound waves created by escaping water
Which of the following should an operator investigate first when well pump and control
problems occur?
A. Depth of supply
B. Piping
C. Electricity
D. Water leaks
C. Electricity
What is the correct procedure for mixing acid and water?
A. Acid is added slowly to the water
B. Acid is added quickly to the water
C. Water is added quickly to the acid
D. Water is added slowly to the acid
A. Acid is added slowly to the water
Low temperatures and low alkalinity:
A. Enhance coagulation and flocculation
B. Hinder coagulation and flocculation
C. Have no effect on coagulation and flocculation
D. Can be adjusted with activated silica
B. Hinder coagulation and flocculation
What type of fire extinguisher should be used for fires with live electricity present?
A. Class B
B. Class C
C. Class D
D. Class A
B. Class C
Which of the following is the principal constituent in water that corrodes metals?
A. Alkalinity
B. Hydrogen sulfide
C. Sodium chloride
D. Dissolved oxygen
D. Dissolved oxygen
The cone of depression forms around:
A. A well during pumping
B. Bacteriological samples during incubation
C. Pump impellers cavitating
D. An air line
A. A well during pumping
What are the two main chemical species formed by chlorine in water and what name
are they known by collectively?
A. HOCl and OCl-; free available chlorine
B. Cl2 and OCl-; breakpoint chlorine
C. Cl2 and H20; chlorine and water
D. H+ and OH-; ions
A. HOCl and OCl-; free available chlorine
Filters in a water treatment process are primarily for removing or reducing:
A. Calcium and magnesium sulfates
B. Color
C. Tastes and odors
D. Turbidity
D. Turbidity
A mixture of air and gas is considered hazardous when the mixture exceeds what
percentage of the lower explosive limit (LEL)?
A. 0%
B. 3%
C. 7%
D. 10%
D. 10%
Prepared water sample bottles used for collecting water samples for bacteriological
examination contain sodium thiosulfate crystals. It is important not to rinse out the bottle
because the sodium thiosulfate:
A. Eliminates the need to refrigerate the sample
B. Holds the pH at a constant value
C. Kills any pathogens that may be present in the sample
D. Neutralizes any chlorine present in the sample
D. Neutralizes any chlorine present in the sample
The basic types of pumps used for pumping ground water wells are:
A. Positive displacement and diaphragm pumps
B. Vertical turbine, line-shaft turbine and submersible pumps
C. Sewage ejector and screw pumps
D. Split-case, frame-mounted pumps and close-coupled vertically mounted pumps
B. Vertical turbine, line-shaft turbine and submersible pumps
A composite sample should never be used when sampling for which contaminant?
A. Benzene
B. Nitrate
C. Barium
D. Bacteria
D. Bacteria
During the backwash cycle, the backwash rate must be high enough to:
A. Provide for proper bed stratification
B. Prevent media loss
C. Expand the media to cause the media grains to agitate violently
D. Allow the operator to observe the media
C. Expand the media to cause the media grains to agitate violently
What are the correct procedures for changing a chlorine cylinder?
A. Shut the water supply off before closing down the chlorine cylinder
B. Starting at the chlorine contact point and working back to the tank, shut off the ball
valves
C. No special order is required, but be sure to shut off the electricity first
D. Shut the chlorine supply off at the tank first and evacuate the lines before turning off the
water
D. Shut the chlorine supply off at the tank first and evacuate the lines before turning off the
water
The multiple tube fermentation test method consists of three tests: the presumptive, the
completed, and the _____ test.
A. Standard plate count
B. Confirmed
C. Coliform
D. Fecal
B. Confirmed
Ground water generally requires less treatment than surface water for:
A. Radionucides
B. Industrial solvents
C. Microorganisms
D. Iron and manganese
C. Microorganisms