COLORADO GOTHERMAL ENGINEERING
TECHNICIAN CERTIFICATION EXAM QUESTIONS
AND CORRECT ANSWERS (VERIFIED ANSWERS)
Q&A 2026|INSTANT DOWNLOAD PDF
1. What is the primary source of geothermal energy?
A. Solar radiation
B. Heat from the Earth’s interior
C. Ocean tides
D. Wind pressure
Rationale: Geothermal energy originates from radioactive
decay and residual heat within the Earth.
Correct answer: B
2. Which fluid is most commonly used in geothermal power
plants?
A. Diesel
B. Steam or hot water
C. Liquid nitrogen
D. Ethanol
Rationale: Geothermal systems use naturally heated water or
steam from underground reservoirs.
Correct answer: B
,3. What type of rock is most favorable for geothermal
reservoirs?
A. Non-porous granite
B. Highly fractured porous rock
C. Solid marble
D. Clay layers only
Rationale: Fractures allow fluid circulation and heat transfer.
Correct answer: B
4. Which process drives a geothermal power plant turbine?
A. Magnetic induction
B. Steam expansion
C. Solar heating
D. Chemical combustion
Rationale: High-pressure steam spins turbines to generate
electricity.
Correct answer: B
5. What is a geothermal gradient?
A. Air pressure change with altitude
B. Temperature increase with depth
C. Soil density variation
D. Rock hardness index
,Rationale: It describes how temperature rises as depth
increases in the Earth.
Correct answer: B
6. What is the purpose of a geothermal heat exchanger?
A. Store electricity
B. Transfer heat between fluids
C. Cool magma
D. Generate seismic waves
Rationale: It transfers heat without mixing fluids.
Correct answer: B
7. Which drilling method is commonly used in geothermal
wells?
A. Air drilling only
B. Rotary drilling
C. Hand auger
D. Hydraulic jet cutting only
Rationale: Rotary drilling is efficient for deep geothermal wells.
Correct answer: B
8. What is the main environmental concern of geothermal
plants?
, A. Oxygen depletion
B. Induced seismicity
C. Ozone destruction
D. Ocean acidification
Rationale: Fluid injection can trigger minor earthquakes.
Correct answer: B
9. What is a geothermal reservoir?
A. Surface lake
B. Underground heat and fluid storage zone
C. Solar collector field
D. Coal deposit
Rationale: It stores hot water/steam under the Earth’s surface.
Correct answer: B
10. Which gas is often released in geothermal systems?
A. Oxygen
B. Hydrogen sulfide
C. Nitrogen
D. Helium only
Rationale: Hydrogen sulfide is naturally present in geothermal
fluids.
Correct answer: B
TECHNICIAN CERTIFICATION EXAM QUESTIONS
AND CORRECT ANSWERS (VERIFIED ANSWERS)
Q&A 2026|INSTANT DOWNLOAD PDF
1. What is the primary source of geothermal energy?
A. Solar radiation
B. Heat from the Earth’s interior
C. Ocean tides
D. Wind pressure
Rationale: Geothermal energy originates from radioactive
decay and residual heat within the Earth.
Correct answer: B
2. Which fluid is most commonly used in geothermal power
plants?
A. Diesel
B. Steam or hot water
C. Liquid nitrogen
D. Ethanol
Rationale: Geothermal systems use naturally heated water or
steam from underground reservoirs.
Correct answer: B
,3. What type of rock is most favorable for geothermal
reservoirs?
A. Non-porous granite
B. Highly fractured porous rock
C. Solid marble
D. Clay layers only
Rationale: Fractures allow fluid circulation and heat transfer.
Correct answer: B
4. Which process drives a geothermal power plant turbine?
A. Magnetic induction
B. Steam expansion
C. Solar heating
D. Chemical combustion
Rationale: High-pressure steam spins turbines to generate
electricity.
Correct answer: B
5. What is a geothermal gradient?
A. Air pressure change with altitude
B. Temperature increase with depth
C. Soil density variation
D. Rock hardness index
,Rationale: It describes how temperature rises as depth
increases in the Earth.
Correct answer: B
6. What is the purpose of a geothermal heat exchanger?
A. Store electricity
B. Transfer heat between fluids
C. Cool magma
D. Generate seismic waves
Rationale: It transfers heat without mixing fluids.
Correct answer: B
7. Which drilling method is commonly used in geothermal
wells?
A. Air drilling only
B. Rotary drilling
C. Hand auger
D. Hydraulic jet cutting only
Rationale: Rotary drilling is efficient for deep geothermal wells.
Correct answer: B
8. What is the main environmental concern of geothermal
plants?
, A. Oxygen depletion
B. Induced seismicity
C. Ozone destruction
D. Ocean acidification
Rationale: Fluid injection can trigger minor earthquakes.
Correct answer: B
9. What is a geothermal reservoir?
A. Surface lake
B. Underground heat and fluid storage zone
C. Solar collector field
D. Coal deposit
Rationale: It stores hot water/steam under the Earth’s surface.
Correct answer: B
10. Which gas is often released in geothermal systems?
A. Oxygen
B. Hydrogen sulfide
C. Nitrogen
D. Helium only
Rationale: Hydrogen sulfide is naturally present in geothermal
fluids.
Correct answer: B
