Water Distribution 1 | Questions with 100% Verified Answers |
Latest Update 2026/2027
Question: Head is measured in
Answer: height (feet) or pressure
Question: Which type of valve will prevent the collapse of a pipe
Answer: Air-and-vacuum relief valve
Question: The highest degree of protection of a coated steel pipe is....
Answer: cathodic protection
Question: At which time of day is the age of the water stored in the distribution system the highest/oldest?
Answer: In the morning
Question: One of chlorine advantages is that it
Answer: has a persistent residual
Question: Chlorine gas is _____ times heavier than air.
Answer: 2.5X
Question: After a water storage tank has been chlorinated, which bacteriological test must prove negative
before the tank is put back into service.
Answer: Coliform test
Question: ~~~~~~Which is the best and most reliable way of finding a very small chlorine leak?
Answer: Use a chlorine gas detector and place it near any area suspected of leaking.
Question: The minimum required free chlorine residual anywhere in the distribution system is
Answer: a detectable level
Question: 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
Answer: 6 hours
Question: Samples collected for cloakrooms are collected in plastic bottles that must contain
Answer: Sodium thiosulfate
Question: The volume of a sample for coliform compliance is
Answer: 100 ml
Question: If a water sample is not analyzed immediately for chlorine residual, it is acceptable to be analyzed
within
Answer: 15 minutes
, Question: The heart of a pump is called the
Answer: impeller
Question: Which device serves the same function as the packing
Answer: Mechanical seal
Question: Which is used to stop air leakage into the casing around the pump shaft
Answer: seals
Question: Which is at the top of a stuffing box?
Answer: Packing gland
Question: Which assembly holds the lantern ring and packing?
Answer: Stuffing box
Question: Why is it important to monitor the speed of a variable speed pump?
Answer: To prevent cavitation from occurring
Question: ~~~Which basic electrical unit is used to measure a materials opposition of flow of electricity?
Answer: Ohm
Question: The first oil change on a pump should be done
Answer: After a month of operation
Question: How often should the temperature of centrifugal pump motor bearings be checked with a
thermometer?
Answer: Once a month
Question: ~~~~All sensors that respond to liquid pressure will preform poorly if _______ enters the air sensor
Answer: Air
Question: Which agency sets limits on the concentration levels of harmful contaminants in potable water
distributed to costumers?
Answer: United States Environmental Protection Agency
Question: Which violations are most serious?
Answer: Tier 1
Question: A positive fecal coliform test must be reported to the primary agency within __________ (time)
Answer: 24 hours
Question: ~~~~The number of monthly distribution system bacteriological samples required is based on....
Answer: based on the population served
Question: ~~~Which is the approximate angle of response for average soils when using the sloping method for
the prevention of cave ins?
Answer: 1.0 : 1.0
Latest Update 2026/2027
Question: Head is measured in
Answer: height (feet) or pressure
Question: Which type of valve will prevent the collapse of a pipe
Answer: Air-and-vacuum relief valve
Question: The highest degree of protection of a coated steel pipe is....
Answer: cathodic protection
Question: At which time of day is the age of the water stored in the distribution system the highest/oldest?
Answer: In the morning
Question: One of chlorine advantages is that it
Answer: has a persistent residual
Question: Chlorine gas is _____ times heavier than air.
Answer: 2.5X
Question: After a water storage tank has been chlorinated, which bacteriological test must prove negative
before the tank is put back into service.
Answer: Coliform test
Question: ~~~~~~Which is the best and most reliable way of finding a very small chlorine leak?
Answer: Use a chlorine gas detector and place it near any area suspected of leaking.
Question: The minimum required free chlorine residual anywhere in the distribution system is
Answer: a detectable level
Question: 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
Answer: 6 hours
Question: Samples collected for cloakrooms are collected in plastic bottles that must contain
Answer: Sodium thiosulfate
Question: The volume of a sample for coliform compliance is
Answer: 100 ml
Question: If a water sample is not analyzed immediately for chlorine residual, it is acceptable to be analyzed
within
Answer: 15 minutes
, Question: The heart of a pump is called the
Answer: impeller
Question: Which device serves the same function as the packing
Answer: Mechanical seal
Question: Which is used to stop air leakage into the casing around the pump shaft
Answer: seals
Question: Which is at the top of a stuffing box?
Answer: Packing gland
Question: Which assembly holds the lantern ring and packing?
Answer: Stuffing box
Question: Why is it important to monitor the speed of a variable speed pump?
Answer: To prevent cavitation from occurring
Question: ~~~Which basic electrical unit is used to measure a materials opposition of flow of electricity?
Answer: Ohm
Question: The first oil change on a pump should be done
Answer: After a month of operation
Question: How often should the temperature of centrifugal pump motor bearings be checked with a
thermometer?
Answer: Once a month
Question: ~~~~All sensors that respond to liquid pressure will preform poorly if _______ enters the air sensor
Answer: Air
Question: Which agency sets limits on the concentration levels of harmful contaminants in potable water
distributed to costumers?
Answer: United States Environmental Protection Agency
Question: Which violations are most serious?
Answer: Tier 1
Question: A positive fecal coliform test must be reported to the primary agency within __________ (time)
Answer: 24 hours
Question: ~~~~The number of monthly distribution system bacteriological samples required is based on....
Answer: based on the population served
Question: ~~~Which is the approximate angle of response for average soils when using the sloping method for
the prevention of cave ins?
Answer: 1.0 : 1.0
