Water Distribution 1 Final exam questions and answers 100% verified

Water Distribution 1 Final exam
questions and answers 100% verified
Il`




Head is measured in - CORRECT ANSWER-feet
Il`
Il` Il` Il` Il` Il` Il` Il`




A plat is - CORRECT ANSWER-A map
Il`
Il` Il` Il` Il` Il` Il` Il`




Which type of valve will prevent the collapse of a pipe - CORRECT ANSWER-Air-and-
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`

Il`



vaccume relief valve
Il`
Il` Il`




The highest degree of protection of a coated steel pipe is - CORRECT ANSWER-
Il` Il` Il`

Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`




cathodic protection
Il`
Il`




At which time of day is the age of the water stored in the distribution system the
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`

Il`



highest? - CORRECT ANSWER-In the morning
Il`
Il` Il` Il` Il` Il`




One of chlorines advantages is that it - CORRECT ANSWER-has a persistent residual
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`




Chlorine gas is _____ times heavier than air. - CORRECT ANSWER-2.5
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`




After a water storage tank has been chlorinated, which bacteriological test must prove
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`




negative before the tank is put back into service. - CORRECT ANSWER-Coliform test
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`




Which is the best and most reliable way of finding a very small chlorine leak? -
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`




CORRECT ANSWER-Use a chlorine gas detector and place it near any area suspected of Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`




leaking.
Il`

Il`
Il`




The minimum required free chlorine residual anywhere in the distribution system is -
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`

Il`



CORRECT ANSWER-a detectable level
Il`
Il` Il` Il`




First draw samples for the analysis of lead and copper water must be collected from
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`




taps where the water has stood motionless in the plumbing for at least - CORRECT
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`

Il`



ANSWER-6 hours
Il`
Il`




Samples collected for cloakrooms are collected in plastic bottles that must contain - Il` Il` Il` Il` Il`

Il`
Il` Il` Il` Il` Il` Il` Il`




CORRECT ANSWER-Sodium thiosulfate
Il`
Il` Il`




The volume of a sample for coliform compliance is - CORRECT ANSWER-100 ml
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`




If a water sample is not analyzed immediately for chlorine residual, it is acceptable to be
Il` Il` Il` Il` Il` Il` Il` Il` Il`

Il`
Il` Il` Il` Il` Il` Il` Il`




analyzed within - CORRECT ANSWER-15 minutes
Il`
Il` Il` Il` Il` Il`




The heart of a pump is called the - CORRECT ANSWER-impeller
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`




Which device serves the same function as the packing - CORRECT ANSWER-
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`

Il`



Mechanical seal
Il`
Il`




Which is used to stop air leakage into the casing around the pump shaft - CORRECT
Il` Il` Il` Il`

Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`




ANSWER-seals
Il`




Which is at the top of a stuffing box? - CORRECT ANSWER-Packing gland
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`




Which assembly holds the lantern ring and packing? - CORRECT ANSWER-Stuffing
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`

Il`



box
Il`




Why is it important to monitor the speed of a variable speed pump? - CORRECT
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`

, Il`



ANSWER-To prevent cavitation from occurring
Il`
Il` Il` Il` Il`




Which basic electrical unit is used to measure a materials opposition of flow of
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`

Il`



electricity? - CORRECT ANSWER-Ohm
Il`
Il` Il` Il`




The first oil change on a pump should be done - CORRECT ANSWER-After a month of
Il` Il`

Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`




operation
Il`




How often should the temperature of centrifugal pump motor bearings be checked with
Il` Il` Il` Il` Il` Il` Il` Il`

Il`
Il` Il` Il` Il` Il`




a thermometer? - CORRECT ANSWER-Once a month
Il`
Il` Il` Il` Il` Il` Il`




All sensors that respond to liquid pressure will preform poorly if _______ enters the air
Il` Il` Il` Il` Il` Il`

Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il`




sensor - CORRECT ANSWER-Air
Il`
Il` Il` Il`




Which agency sets limits on the concentration levels of harmful contaminants in potable
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`

Il`
Il`




water distributed to costumers? - CORRECT ANSWER-United States Environmental
Il` Il`

Il`
Il` Il` Il` Il` Il` Il`




Protection Agency
Il`
Il`




Which violations are most serious? - CORRECT ANSWER-Tier 1
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il`




A positive fecal coliform test must be reported to the primacy agency within 24 hours -
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`

Il`



CORRECT ANSWER-24 hours
Il`
Il` Il`




The number of monthly distribution system bacteriological samples is required is -
Il` Il` Il` Il` Il` Il`

Il`
Il` Il` Il` Il` Il`




CORRECT ANSWER-based on the population served
Il`
Il` Il` Il` Il` Il`




Which is the approximate angle of response for average soils when using the sloping
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`

Il`



method for the prevention of cave ins? - CORRECT ANSWER-1.0 : 1.0
Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`




At what time of day is the age of the water stored in a distribution system the lowest? -
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`

Il`
Il` Il` Il` Il` Il` Il` Il` Il`




CORRECT ANSWER-Late Evening
Il`
Il` Il`




Which type of maps should not overlap each other? - CORRECT ANSWER-Sectional
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`

Il`



maps
Il`




Which of the following is a joint for ductile iron piping? - CORRECT ANSWER-Flexible
Il` Il`

Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`




ball joint
Il`
Il`




The amount of feet in energy required to overcome resistance to flow in a pipe is called
Il` Il` Il` Il` Il` Il`

Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`




- CORRECT ANSWER-friction head
Il`
Il` Il` Il`




The fire insurance underwriters recommend that no main should have a diameter less
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`

Il`



than - CORRECT ANSWER-6 inches
Il`
Il` Il` Il` Il`




Water velocities in a pipe should be limited to 5 ft/sec in order to - CORRECT
Il` Il` Il` Il` Il` Il`

Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`




ANSWER-minimize friction loss
Il`
Il` Il`




Which of the following is a type of joint in polyvinyl chloride piping? - CORRECT
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`

Il`



ANSWER-Bell and spigot type
Il`
Il` Il` Il`




Which of the following is a type of joint in polyethylene piping? - CORRECT ANSWER-
Il` Il` Il`

Il`
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`




Thermal butt-fusion
Il`
Il`




Which of the following is a type of joint for ductile iron piping? - CORRECT ANSWER-
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`

Il`



Flanged joint
Il`
Il`




The height of the water in three differently shaped tanks is 22.4 feet. In which tank is the
Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il` Il`