NGWA STUDY GUIDE 2025 QUESTIONS AND ANSWERS
RATED A+
✔✔A good preventative maintenance program will create... - ✔✔... operators who have
a thorough understanding of equipment.
✔✔Drilling rigs should be fueled... - ✔✔... in the morning before starting the drill.
✔✔Drill rig or pump hoist engines should not be started unless... - ✔✔... clutches are
disengaged and gears are in neutral.
✔✔Drilling mud should... - ✔✔... be specially designed to meet the specific conditions
for each well.
✔✔What is/are the main cause(s) of wear and breakage on wire rope? -
✔✔Overloading, violent jerking, and kinking.
✔✔To properly construct a large column screen well, one should take one of the
following steps. - ✔✔Sample analysis.
✔✔One principal reason for increasing pipe diameter is to... - ✔✔... provide sufficient
space for pumping equipment large enough to yield.
✔✔Who is the most qualified person to design a well? - ✔✔Hydrogeologist.
✔✔In proper well design... - ✔✔... well screen intake velocity should be less than
1'/second
✔✔Reduced yield from a water-bearing formation can be caused by... - ✔✔... screen
incrustation.
✔✔The diameter of a screen is not a critical factor in the specific capacity. Double the
diameter of a screen generally increases the specific capacity by what percent? -
✔✔7% to 10%.
✔✔When drilling in an unfamiliar area, the collection of samples... - ✔✔... can enable
the ground water professional to correlate formations from one area to another.
✔✔A well screen... - ✔✔1. Is a filtering device.
2. Permits water to enter the well from the saturated aquifer.
3. Precent sediment from entering the well.
✔✔(T/F) Gravel-packed wells should be sealed at the top of the gravel pack as well as
in the annulus. - ✔✔True.
RATED A+
✔✔A good preventative maintenance program will create... - ✔✔... operators who have
a thorough understanding of equipment.
✔✔Drilling rigs should be fueled... - ✔✔... in the morning before starting the drill.
✔✔Drill rig or pump hoist engines should not be started unless... - ✔✔... clutches are
disengaged and gears are in neutral.
✔✔Drilling mud should... - ✔✔... be specially designed to meet the specific conditions
for each well.
✔✔What is/are the main cause(s) of wear and breakage on wire rope? -
✔✔Overloading, violent jerking, and kinking.
✔✔To properly construct a large column screen well, one should take one of the
following steps. - ✔✔Sample analysis.
✔✔One principal reason for increasing pipe diameter is to... - ✔✔... provide sufficient
space for pumping equipment large enough to yield.
✔✔Who is the most qualified person to design a well? - ✔✔Hydrogeologist.
✔✔In proper well design... - ✔✔... well screen intake velocity should be less than
1'/second
✔✔Reduced yield from a water-bearing formation can be caused by... - ✔✔... screen
incrustation.
✔✔The diameter of a screen is not a critical factor in the specific capacity. Double the
diameter of a screen generally increases the specific capacity by what percent? -
✔✔7% to 10%.
✔✔When drilling in an unfamiliar area, the collection of samples... - ✔✔... can enable
the ground water professional to correlate formations from one area to another.
✔✔A well screen... - ✔✔1. Is a filtering device.
2. Permits water to enter the well from the saturated aquifer.
3. Precent sediment from entering the well.
✔✔(T/F) Gravel-packed wells should be sealed at the top of the gravel pack as well as
in the annulus. - ✔✔True.
