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Water Distribution: Multiple Choice Questions and Answers, Exams of Water and Wastewater Engineering

Southeastern Louisiana UniversityWater and Wastewater Engineering

A comprehensive set of multiple-choice questions and answers related to water distribution systems. It covers various aspects of water distribution, including head measurement, pipe protection, water quality, pump operation, and fire flow. Useful for students and professionals in the field of water engineering and management.

Typology: Exams

2024/2025

Available from 03/26/2025

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Water Distribution 1 | 100% Correct
Answers | Verified | Latest 2024 Version
Head is measured in - ✔✔feet
A plat is - ✔✔A map
Which type of valve will prevent the collapse of a pipe - ✔✔Air-and-vaccume relief valve
The highest degree of protection of a coated steel pipe is - ✔✔cathodic protection
At which time of day is the age of the water stored in the distribution system the highest? - ✔✔In the
morning
One of chlorines advantages is that it - ✔✔has a persistent residual
Chlorine gas is _____ times heavier than air. - ✔✔2.5
After a water storage tank has been chlorinated, which bacteriological test must prove negative before
the tank is put back into service. - ✔✔Coliform test
Which is the best and most reliable way of finding a very small chlorine leak? - ✔✔Use a chlorine gas
detector and place it near any area suspected of leaking.
The minimum required free chlorine residual anywhere in the distribution system is - ✔✔a detectable
level
First draw samples for the analysis of lead and copper water must be collected from taps where the
water has stood motionless in the plumbing for at least - ✔✔6 hours
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Download Water Distribution: Multiple Choice Questions and Answers and more Exams Water and Wastewater Engineering in PDF only on Docsity!

Water Distribution 1 | 100% Correct

Answers | Verified | Latest 2024 Version

Head is measured in - ✔✔feet A plat is - ✔✔A map Which type of valve will prevent the collapse of a pipe - ✔✔Air-and-vaccume relief valve The highest degree of protection of a coated steel pipe is - ✔✔cathodic protection At which time of day is the age of the water stored in the distribution system the highest? - ✔✔In the morning One of chlorines advantages is that it - ✔✔has a persistent residual Chlorine gas is _____ times heavier than air. - ✔✔2. After a water storage tank has been chlorinated, which bacteriological test must prove negative before the tank is put back into service. - ✔✔Coliform test Which is the best and most reliable way of finding a very small chlorine leak? - ✔✔Use a chlorine gas detector and place it near any area suspected of leaking. The minimum required free chlorine residual anywhere in the distribution system is - ✔✔a detectable level First draw samples for the analysis of lead and copper water must be collected from taps where the water has stood motionless in the plumbing for at least - ✔✔6 hours

Samples collected for cloakrooms are collected in plastic bottles that must contain - ✔✔Sodium thiosulfate The volume of a sample for coliform compliance is - ✔✔100 ml If a water sample is not analyzed immediately for chlorine residual, it is acceptable to be analyzed within

  • ✔✔15 minutes The heart of a pump is called the - ✔✔impeller Which device serves the same function as the packing - ✔✔Mechanical seal Which is used to stop air leakage into the casing around the pump shaft - ✔✔seals Which is at the top of a stuffing box? - ✔✔Packing gland Which assembly holds the lantern ring and packing? - ✔✔Stuffing box Why is it important to monitor the speed of a variable speed pump? - ✔✔To prevent cavitation from occurring Which basic electrical unit is used to measure a materials opposition of flow of electricity? - ✔✔Ohm The first oil change on a pump should be done - ✔✔After a month of operation How often should the temperature of centrifugal pump motor bearings be checked with a thermometer?
  • ✔✔Once a month

Which of the following is a type of joint in polyethylene piping? - ✔✔Thermal butt-fusion Which of the following is a type of joint for ductile iron piping? - ✔✔Flanged joint The height of the water in three differently shaped tanks is 22.4 feet. In which tank is the psi at the bottom the highest? - ✔✔It will be the same in all three tanks A water tank has a glass tube on its side showing the water level of the tank. What is its surface called? - ✔✔Piezometric surface Minor head losses are caused by - ✔✔Sudden changes in direction or velocity of flow Water mains should primarily be sized based on - ✔✔Adequate fire flow at a appropriate pressure The most desirable residential pressure ranges from - ✔✔ 50 - 75 psi Which is pipe strength expressed in? - ✔✔Tensile and flexural strength The resistance of a material to longitudinal pulling forces before it breaks is called - ✔✔Tensile Strength Most water systems use fire hydrants with two nozzles with diameters of ______ and one nozzle with a diameter of ____ - ✔✔2.5 in and 4.5 in Which type of pipe is durable and strong, has high flexural strength and good corrosion resistance, and is easily tapped? - ✔✔Ductile iron which of the following is a joint for concrete piping? - ✔✔Bell and spigot type

Precipitative softening water treatment plants try to end up with distribution system water that is - ✔✔Slightly scale forming Which is a closed fire line? - ✔✔Unmetered connection for fire protection system Comprehensive maps of medium to large systems generally have scales ranging from - ✔✔500 to 1000 feet to 1 inch Sectional maps generally have scales ranging from - ✔✔50 to 100 ft to 1 inch Which type of centrifugal pumps are the most common? - ✔✔Radial flow impellers Name two types of joints for steel piping - ✔✔Expansion joint and rubber gasket joint The pressure during fire flow conditions should not drop below - ✔✔20 psi Which type of distribution system configuration has smaller mains that generally terminate as dead ends? - ✔✔Tree system Which is applied to electrodes placed in the water of a water storage tank? - ✔✔DC current The frequent starting of distribution system pumps probably indicates - ✔✔inadequate distribution storage Which needs to be determined first when designing a pump station? - ✔✔Head requirements Which is plotted on the x axis of a pump curve? - ✔✔Capacity (flow rate) Hydraulics is the study of - ✔✔fluids in motion and at rest

Polyvinyl chloride piping using solvent weld joints is most appropriate - ✔✔only for small lines Concrete piping using bell and spigot type joints is most appropriate - ✔✔for all locations Which type of piping is available is both bolted and boltless flexible pipe joint designs? - ✔✔Ball and socket joint Which type of pipe joint permits flexible pipe alignment, is inexpensive to manufacture, and is easy to assemble? - ✔✔Push on joint Which type of pipe joint has machined ends? - ✔✔Shouldered joint New polyvinyl chloride pipe has a C value of about - ✔✔150+ Do you think an emergency storage tank is likely to contain potable water? - ✔✔No Which type of valve is used on hydraulic lines connected to valve actuators? - ✔✔Needle valve Which type of valve would be particularly useful for throttling the flow of corrosive liquids? - ✔✔Pinch valve Water meter pits are usually used in - ✔✔cold climates A horizontal load, parallel to a pump shaft is called a - ✔✔thrust load Manufacturers typical design pumps such that the first critical speed is at least ____ higher or lower than rated speed - ✔✔20% Regarding fire flow, mains smaller than 6 inches should only be used - ✔✔to complete a grid

Which type of pipe requires special external protection in high chloride soils? - ✔✔Reinforced concrete Which type of pipe is most likely to collapse or become distorted under partial vacuum? - ✔✔Steel piping Casing pipe used to house a large water main under a railroad crossing should have a diameter that is ___________ larger than the outside diameter of the water main bells. - ✔✔2 to 8 inches Data manipulations using the basic elements of an automatic mapping system would include - ✔✔modeling and analysis Which data category for water utility data sets includes the following map layers: Control information, planimetric features, and hydrology features? - ✔✔Base data Which is the chlorine species called HTH - ✔✔Calcium Hypochlorite Which is the proper detention time for disinfecting a water storage tank that is filled with already chlorinated water such that the free chlorine residual is 10 mg/L after the proper detention time is completed? - ✔✔6 hours Which is the proper detention time for disinfecting a water storage tank with water that is mixed with hypochlorite already in the tank such that the free chorine is 10 mg/L after proper detention time is complete? - ✔✔24 hours The disinfectant residual in treated water entering the distribution system must not be less than - ✔✔o. mg/L for more than 4 hours during periods where the system is serving water to the public The chemical formula for hypochlorous acid is - ✔✔HOCL Usually the best disinfectant to use in large diameter pipes or very long pipelines is - ✔✔chorine gas