Study with the several resources on Docsity
Earn points by helping other students or get them with a premium plan
Prepare for your exams
Study with the several resources on Docsity
Earn points to download
Earn points by helping other students or get them with a premium plan
A series of multiple-choice questions and answers related to water distribution systems. It covers topics such as groundwater levels, water quality, corrosion, fire hydrants, well components, dissolved oxygen, pump types, system mapping, water potability, flow velocity, excavation safety, hydrogen sulfide removal, water hardness, electrical power, check valves, and water disinfection. The questions address practical aspects of water treatment and distribution, making it a useful resource for students and professionals in the field. The document also touches on the importance of safety measures and regulatory compliance in water management.
Typology: Exams
1 / 25
This page cannot be seen from the preview
Don't miss anything!
The difference between the static groundwater level and the pumping level is the
Radius of influence
Drawdown
Cone of depression
Watershed ✔✔Drawdown
A customer complaint about the presence of brown floc in tap water can best be handled by
Denying that it is from your pipes
Scheduling a visit to the premises later in the week
Investigating the problem as soon as possible
Asking the customer to send a sample to the division of health ✔✔Investigating the problem as soon as possible
The term "aquifer" relates to which one of the following?
Surface water
Lake
Stream
Groundwater ✔✔Groundwater
One indication of corrosive water is a high concentration of
Algae odors
Allow easy maintenance of the hydrant
Keep the barrel from rusting
Minimize water hammer
Keep the hydrant from freezing ✔✔Keep the hydrant from freezing
The component parts of a well include all of the following except
Sanitary seal
Well screen
Pressure switch
Cement grout ✔✔Pressure switch
At the same barometric pressure, the amount of dissolved oxygen in cold water tends to be _________ the amount of dissolved oxygen in warm water.
Less than
More then
More or less then (depending on the biological oxygen demand)
The same as ✔✔More than
Which of the following is the principle constituent in water that causes corrosion of metals?
Alkalinity
Dissolved oxygen
Comprehensive map
System atlas
Charles atlas ✔✔Comprehensive map
What term describes water that is suitable for drinking?
Potable
Palatable
Colorless
Clean ✔✔Potable
Velocity of flow in mains is usually expressed in terms of
Feet per second
Gallons per minute
Liters per foot
Milligrams per litre ✔✔Feet per second
A "competent person" at an excavation work site
Is capable of identifying hazards and has the authority to take corrective measures
Is responsible for accidents at the work site
Must be a professional engineer
Decreased flow
Retain until it settles out ✔✔Oxidation and filtration
Hardness may be expressed in
Milligrams per litre as CaCo
Milliliters per litre
Pounds per day
Pounds per million gallons ✔✔Milligrams per litre as CaCO
The basic unit of electrical power is the
Coulomb
Ohm
Volt
Watt ✔✔Watt
Check valves are used to
Permit air to escape from the pipe
Permit flow in only one direction
Regulate velocity
Stop flow in both directions ✔✔Permit flow in only one direction
Beards or long sideburns prohibit an operator from safely
Water level obtained in a well after penetrating several aquifers ✔✔Upper surface of the groundwater
The shaft speed of an electric motor is most commonly expressed in units of
Feet per second per second
Feet per second
Revolutions per second
Revolutions per minute ✔✔Revolutions per minute
A coupon test installation in a distribution system is used to
Determine the systems water quality
Determine the rate of scaling or corrosion
Calculate the daily treatment changes
Assist in calculating hydrant flows ✔✔Determine the rate of scaling or corrosion
Disease-causing bacteria are known as
Coliforms
Noncoliforms
Nonpathogenic
Pathogenic ✔✔Pathogenic
Normally surface water and groundwater have a pH range of
9.0 to 10.
Continuously while workers are inside the excavation
Hourly while workers are inside the excavation
Prior to the start of work each day only
Daily prior to the start of work, and as needed throughout the shift ✔✔Daily, prior to the start of work, and as needed throughout the shift
The component of a centrifugal pump sometimes installed on the end of a suction pipe to hold the priming is known as a
Casing
Drain
Foot valve
Ventilator ✔✔Foot valve
The principal purpose of an altitude valve on an elevated tank is to
Control maximum filling level in distribution storage
Maintain constant static head in the distribution system
Maintain uniform flow from elevation storage
Restrict water flow to high-demand areas ✔✔Control maximum filling level in distribution storage
The term "primacy" means the
Authority by the states to supersede the USEPA drinking water regulations
Authority by the USEPA to supersede state drinking water regulations
Aeration
Coagulation
Filtration
Sedimentation ✔✔Aeration
The treatment process designed to kill pathogenic organisms is
Disinfection
Oxidation
Pasteurization
Sterilization ✔✔Disinfection
Lead in drinking water can result in
Prostate cancer in men
Impaired mental functioning in children
Stomach and intestinal disorders
Reduced white blood cell count ✔✔Impaired mental functioning in children
A disease that might be transferred to a new victim through water is
Diphtheria
Gonorrhea
Malaria
