D2 - WATER DISTRIBUTION OPERATOR EXAM (CALIFORNIA ) 2024/2025
NEWEST !! COMPLETE ACTUAL EXAM QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS ) ALREADY GRADED A+.
three sources of supply - ANSWER-Surface water treatment plants,
Import/Purchased water, and Wells.
Transmission Main - ANSWER-A very large main designed to move
water from one part of the system to another.
Shut-Off Valve - ANSWER-A type of valve the water company uses
when they need to turn water off to a particular consumer.
Where is a Shut-Off Valve typically located? - ANSWER-Usually found
connected to a consumer's meter.
Why might a water company need to shut water off to a particular
consumer? - ANSWER-Because of a request to connect or
disconnect, for repairs, or as a result of non payment.
two most common types of Shut-Off Valves - ANSWER-Curb stop &
Angle stop.
Meters - ANSWER-Devices used to read consumer usage.
,where does a water company's property end - ANSWER-At the
consumer's meter.
most common type of residential water meter and why? – ANSWER-
Positive displacement meters, because they accurately measure all
water that flows through them.
three types of water systems - ANSWER-Arterial loop, Grid, and Tree.
minimum acceptable PSI with a system - ANSWER-20 PSI
normal acceptable range of PSI within a system - ANSWER-35 to 65
PSI
When must a pressure regulator be installed on a consumer's service
line? - ANSWER-GREATER than 80 PSI.
What is the highest acceptable PSI within a system, before a pressure
regulator needs to be installed? - ANSWER-80 PSI
Why are higher pressures generally not desired within a system? -
ANSWER-It can damage plumbing fixtures.
Dynamic Pressure - ANSWER-The pressure within a system when
water is moving.
,six types of pipe found in a water distribution system – ANSWER-
Ductile Iron, Concrete, Steel, Asbestos Cement, Plastic and Gray Cast
Iron.
C-Value - ANSWER-The measure of interior smoothness within a pipe.
What does a 140+ C-Value mean? - ANSWER-Very smooth interior
surface of a pipe (Plastic, AC, Concrete)
What does a <100 C-Value mean? - ANSWER-Very bad interior surface
of a pipe (Tuburculated old cast iron)
What is a Pnetrometer? - ANSWER-A tool for measuring the
compressive strength of soil.
What is a Competent Person? - ANSWER-An individual with
excavation knowledge and training who is in charge of an excavation
job, and who has the power to start work in the event of a hazard
When is shoring generally required? - ANSWER-When a trench is 5' or
more in depth, or hazardous soil conditions exist.
Sloping - ANSWER-Editing back the sides of a trench
Sheeting - ANSWER-The process of placing tightly placed planks on
the walls of a trench, when conditions are poor.
, What is Shielding, and what are the two requirements that go
alongside it? - ANSWER-A steel box that protects workers in a hole.
Should extend a minimum of 18" above the top of the hole, and
should be no more than 2' from the bottom of the excavation.
Shoring - ANSWER-A framework of wood, metal, or both.
What are the minimum depth requirements for mains? - ANSWER-2
1/2' for mains, and 1 1/2' for services. Deeper if necessary in cold
climates.
What is a Story Pole? - ANSWER-A tool used for measuring depth in a
trench.
What are the trench width requirements when installing a pipe? -
ANSWER-1' to 2' greater than the pipe diameter.
What is the requirement of portable ladders when placed in a trench?
- ANSWER-A portable ladder must extend 3' above the trench.
When should a portable ladder be placed in a trench/excavation? -
ANSWER-When an excavation is 4' or more in depth.
When it comes to trenches, what is the specific rule for the distance
between ladders and workers? - ANSWER-A worker must always be
NEWEST !! COMPLETE ACTUAL EXAM QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS ) ALREADY GRADED A+.
three sources of supply - ANSWER-Surface water treatment plants,
Import/Purchased water, and Wells.
Transmission Main - ANSWER-A very large main designed to move
water from one part of the system to another.
Shut-Off Valve - ANSWER-A type of valve the water company uses
when they need to turn water off to a particular consumer.
Where is a Shut-Off Valve typically located? - ANSWER-Usually found
connected to a consumer's meter.
Why might a water company need to shut water off to a particular
consumer? - ANSWER-Because of a request to connect or
disconnect, for repairs, or as a result of non payment.
two most common types of Shut-Off Valves - ANSWER-Curb stop &
Angle stop.
Meters - ANSWER-Devices used to read consumer usage.
,where does a water company's property end - ANSWER-At the
consumer's meter.
most common type of residential water meter and why? – ANSWER-
Positive displacement meters, because they accurately measure all
water that flows through them.
three types of water systems - ANSWER-Arterial loop, Grid, and Tree.
minimum acceptable PSI with a system - ANSWER-20 PSI
normal acceptable range of PSI within a system - ANSWER-35 to 65
PSI
When must a pressure regulator be installed on a consumer's service
line? - ANSWER-GREATER than 80 PSI.
What is the highest acceptable PSI within a system, before a pressure
regulator needs to be installed? - ANSWER-80 PSI
Why are higher pressures generally not desired within a system? -
ANSWER-It can damage plumbing fixtures.
Dynamic Pressure - ANSWER-The pressure within a system when
water is moving.
,six types of pipe found in a water distribution system – ANSWER-
Ductile Iron, Concrete, Steel, Asbestos Cement, Plastic and Gray Cast
Iron.
C-Value - ANSWER-The measure of interior smoothness within a pipe.
What does a 140+ C-Value mean? - ANSWER-Very smooth interior
surface of a pipe (Plastic, AC, Concrete)
What does a <100 C-Value mean? - ANSWER-Very bad interior surface
of a pipe (Tuburculated old cast iron)
What is a Pnetrometer? - ANSWER-A tool for measuring the
compressive strength of soil.
What is a Competent Person? - ANSWER-An individual with
excavation knowledge and training who is in charge of an excavation
job, and who has the power to start work in the event of a hazard
When is shoring generally required? - ANSWER-When a trench is 5' or
more in depth, or hazardous soil conditions exist.
Sloping - ANSWER-Editing back the sides of a trench
Sheeting - ANSWER-The process of placing tightly placed planks on
the walls of a trench, when conditions are poor.
, What is Shielding, and what are the two requirements that go
alongside it? - ANSWER-A steel box that protects workers in a hole.
Should extend a minimum of 18" above the top of the hole, and
should be no more than 2' from the bottom of the excavation.
Shoring - ANSWER-A framework of wood, metal, or both.
What are the minimum depth requirements for mains? - ANSWER-2
1/2' for mains, and 1 1/2' for services. Deeper if necessary in cold
climates.
What is a Story Pole? - ANSWER-A tool used for measuring depth in a
trench.
What are the trench width requirements when installing a pipe? -
ANSWER-1' to 2' greater than the pipe diameter.
What is the requirement of portable ladders when placed in a trench?
- ANSWER-A portable ladder must extend 3' above the trench.
When should a portable ladder be placed in a trench/excavation? -
ANSWER-When an excavation is 4' or more in depth.
When it comes to trenches, what is the specific rule for the distance
between ladders and workers? - ANSWER-A worker must always be
