NGWA - Study Questions - General Drilling Exam Latest Update 2025-2026 50 Questions and 100% Verified Correct Answers Guaranteed A+
(T/F) A drilling fluid should do all of the following:
- Cool the bit.
- Promote longevity.
- Remove cuttings from the bit surface.
- Transport cuttings to the surface.
- Plug lost circulation zones.
6. Promote hole stability. - CORRECT ANSWER: True.
(T/F) A well may be used as sewage disposal site only if it is cased to the bottom of the
borehole. - CORRECT ANSWER: False.
(T/F) A well which is finished completely underground, for example a pitless adaptor,
does not need a sanitary surface seal. - CORRECT ANSWER: False.
(T/F) Aquifer development is not an effective way to increase yields substantially. -
CORRECT ANSWER: False.
(T/F) Cable tool rigs are advantageous for the following reasons:
- Straightness of well.
- Minimum maintenance.
3. Economical Use. - CORRECT ANSWER: True.
(T/F) Drilling mud viscosity can be accurately estimated by visual inspection. -
CORRECT ANSWER: False. 1 / 2
(T/F) Dry cement may be mixed with water in the annulus to form an acceptable surface
seal. - CORRECT ANSWER: False.
(T/F) Gravel-packed wells should be sealed at the top of the gravel pack as well as in
the annulus. - CORRECT ANSWER: True.
(T/F) Ground water, like surface water, has a tendency to flow downhill. - CORRECT
ANSWER: True.
(T/F) More than 90% of our nation's fresh water is underground? - CORRECT
ANSWER: True.
(T/F) State or federal laws dictate the minimum length of grout required for various
casing diameters for certain types of wells. - CORRECT ANSWER: True.
(T/F) The size of annular space required for grouting depends on how the well was
drilled. - CORRECT ANSWER: True.
(T/F) Well development procedures should be able to clean the well so the sand concentration in the water is below the maximum allowable limit set for particular water
use. - CORRECT ANSWER: True.
A good preventative maintenance program will create... - CORRECT ANSWER: ...
operators who have a thorough understanding of equipment.
A water system operating at 40% to 60% pressure setting indicates... - CORRECT
ANSWER: ... the pump starts at 40 and will shut off at 60.
A well screen... - CORRECT ANSWER: 1. Is a filtering device.
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