AR GEG Geothermal Contractor
Exam Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. Which type of geothermal resource typically produces the highest
temperature fluids?
A. Low-temperature reservoir
B. Moderate-temperature reservoir
C. High-temperature reservoir
D. Shallow aquifer
High-temperature reservoirs (>150°C) provide the most energy
potential for electricity generation.
2. What is the main purpose of a geothermal well casing?
A. To increase heat flow
B. To prevent well collapse and isolate fluids
C. To generate electricity
D. To measure reservoir pressure
Casing stabilizes the wellbore and prevents contamination between
formations.
3. Which type of geothermal power plant is suitable for low-temperature
resources?
A. Flash steam
B. Dry steam
C. Binary cycle
D. Combined cycle
Binary cycle plants can utilize low- to moderate-temperature fluids by
transferring heat to a secondary fluid.
,4. What is the main environmental concern associated with geothermal
drilling?
A. Noise pollution
B. Excessive water use
C. Release of gases such as H2S
D. Soil erosion
Geothermal wells can release hydrogen sulfide and other gases if not
properly managed.
5. Reinjection of geothermal fluids helps to:
A. Increase surface water levels
B. Sustain reservoir pressure and reduce subsidence
C. Enhance heat extraction only temporarily
D. Cool the plant turbines
Reinjection maintains reservoir pressure and helps prevent ground
subsidence.
6. The primary difference between dry steam and flash steam plants is:
A. Dry steam uses cold water; flash steam uses hot water
B. Dry steam uses steam directly from the reservoir; flash steam
flashes hot water into steam
C. Dry steam is low efficiency; flash steam is high efficiency
D. Dry steam cannot generate electricity
Dry steam plants take steam directly; flash steam plants convert high-
pressure hot water to steam.
7. Geothermal brine often contains which of the following minerals?
A. Quartz
B. Silica
C. Gypsum
D. Halite
Silica is common in geothermal brines and can cause scaling in pipes
and equipment.
8. Which method is commonly used to estimate geothermal reservoir
temperature?
A. Seismic reflection
B. Gravimetric survey
C. Geothermometry using fluid chemistry
D. Satellite imagery
, Chemical geothermometers estimate subsurface temperature based
on fluid mineral equilibria.
9. What is the typical depth range for geothermal production wells?
A. 10–50 m
B. 50–200 m
C. 500–3000 m
D. 4000–6000 m
Most geothermal wells are drilled hundreds to a few thousand meters
deep to reach sufficient temperatures.
10. Which material is commonly used for geothermal piping to resist
corrosion?
A. PVC
B. Aluminum
C. Stainless steel
D. Copper
Stainless steel resists the high temperatures and corrosive chemicals
in geothermal fluids.
11. The main advantage of binary cycle plants over flash steam
plants is:
A. Higher turbine efficiency
B. Lower construction cost
C. Ability to use lower temperature resources
D. Direct use of steam
Binary plants can operate with fluids below 150°C, expanding
geothermal utilization.
12. Which drilling method is most commonly used for geothermal
wells?
A. Auger drilling
B. Cable tool drilling
C. Rotary drilling
D. Percussion drilling
Rotary drilling is efficient for reaching deep, hard rock formations
typical in geothermal reservoirs.
13. Which of the following is a common geothermal scaling issue?
A. Rust formation
B. Silica and carbonate scaling
C. Sand erosion
Exam Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. Which type of geothermal resource typically produces the highest
temperature fluids?
A. Low-temperature reservoir
B. Moderate-temperature reservoir
C. High-temperature reservoir
D. Shallow aquifer
High-temperature reservoirs (>150°C) provide the most energy
potential for electricity generation.
2. What is the main purpose of a geothermal well casing?
A. To increase heat flow
B. To prevent well collapse and isolate fluids
C. To generate electricity
D. To measure reservoir pressure
Casing stabilizes the wellbore and prevents contamination between
formations.
3. Which type of geothermal power plant is suitable for low-temperature
resources?
A. Flash steam
B. Dry steam
C. Binary cycle
D. Combined cycle
Binary cycle plants can utilize low- to moderate-temperature fluids by
transferring heat to a secondary fluid.
,4. What is the main environmental concern associated with geothermal
drilling?
A. Noise pollution
B. Excessive water use
C. Release of gases such as H2S
D. Soil erosion
Geothermal wells can release hydrogen sulfide and other gases if not
properly managed.
5. Reinjection of geothermal fluids helps to:
A. Increase surface water levels
B. Sustain reservoir pressure and reduce subsidence
C. Enhance heat extraction only temporarily
D. Cool the plant turbines
Reinjection maintains reservoir pressure and helps prevent ground
subsidence.
6. The primary difference between dry steam and flash steam plants is:
A. Dry steam uses cold water; flash steam uses hot water
B. Dry steam uses steam directly from the reservoir; flash steam
flashes hot water into steam
C. Dry steam is low efficiency; flash steam is high efficiency
D. Dry steam cannot generate electricity
Dry steam plants take steam directly; flash steam plants convert high-
pressure hot water to steam.
7. Geothermal brine often contains which of the following minerals?
A. Quartz
B. Silica
C. Gypsum
D. Halite
Silica is common in geothermal brines and can cause scaling in pipes
and equipment.
8. Which method is commonly used to estimate geothermal reservoir
temperature?
A. Seismic reflection
B. Gravimetric survey
C. Geothermometry using fluid chemistry
D. Satellite imagery
, Chemical geothermometers estimate subsurface temperature based
on fluid mineral equilibria.
9. What is the typical depth range for geothermal production wells?
A. 10–50 m
B. 50–200 m
C. 500–3000 m
D. 4000–6000 m
Most geothermal wells are drilled hundreds to a few thousand meters
deep to reach sufficient temperatures.
10. Which material is commonly used for geothermal piping to resist
corrosion?
A. PVC
B. Aluminum
C. Stainless steel
D. Copper
Stainless steel resists the high temperatures and corrosive chemicals
in geothermal fluids.
11. The main advantage of binary cycle plants over flash steam
plants is:
A. Higher turbine efficiency
B. Lower construction cost
C. Ability to use lower temperature resources
D. Direct use of steam
Binary plants can operate with fluids below 150°C, expanding
geothermal utilization.
12. Which drilling method is most commonly used for geothermal
wells?
A. Auger drilling
B. Cable tool drilling
C. Rotary drilling
D. Percussion drilling
Rotary drilling is efficient for reaching deep, hard rock formations
typical in geothermal reservoirs.
13. Which of the following is a common geothermal scaling issue?
A. Rust formation
B. Silica and carbonate scaling
C. Sand erosion
