VIRGINIA GEOTHERMAL INSTALLER CERTIFICATION EXAM
200 PRACTICE QUESTIONS WITH EXPLAINED RATIONALES | LATEST
UPDATE
1. What is the primary function of a geothermal heat pump (GHP)
ground loop?
A. To generate electricity from underground heat
B. To exchange heat between the heat pump and the ground
C. To increase the refrigerant pressure
D. To provide domestic water heating only
Correct Answer: B
Rationale: A geothermal ground loop transfers heat between the heat
pump and the relatively stable temperature of the earth. In heating
mode, it supplies heat to the heat pump; in cooling mode, it rejects
heat into the ground.
2. Which type of geothermal system uses buried piping in horizontal
trenches?
A. Vertical closed-loop system
B. Open-loop system
C. Horizontal closed-loop system
D. Direct-expansion rooftop system
Correct Answer: C
Rationale: Horizontal systems place loops in trenches at relatively
,shallow depths. They generally require more land area than vertical
systems but can be practical where sufficient property is available.
3. What is the principal advantage of a vertical ground-loop system
when compared with a horizontal system?
A. It requires less drilling equipment
B. It uses less land area
C. It is always cheaper to install
D. It does not require antifreeze
Correct Answer: B
Rationale: Vertical loops are installed in deep boreholes, requiring
significantly less surface land area than horizontal systems, making
them ideal for small or constrained lots.
4. Which fluid is most commonly used in closed-loop geothermal
systems?
A. Pure refrigerant
B. Water or a water-glycol mixture
C. Diesel fuel
D. Liquid nitrogen
Correct Answer: B
Rationale: Water or a water-antifreeze mixture (such as propylene
glycol) is circulated through closed-loop systems to transfer heat while
preventing freezing in cold climates.
,5. What is the primary purpose of a heat exchanger in a geothermal
system?
A. To generate electricity
B. To transfer heat between two fluids without mixing them
C. To increase groundwater pressure
D. To store thermal energy permanently
Correct Answer: B
Rationale: A heat exchanger allows thermal energy to be transferred
between the ground loop fluid and the refrigerant circuit without the
two fluids ever coming into direct contact.
6. What is the typical temperature range of shallow ground used for
geothermal heat pump systems?
A. -10°C to 0°C
B. 0°C to 5°C
C. 10°C to 20°C
D. 50°C to 100°C
Correct Answer: C
Rationale: At depths below the frost line, ground temperatures remain
relatively stable year-round, typically between 10°C and 20°C depending
on geographic location.
7. Which type of geothermal system draws water directly from a well
or surface water body?
, A. Closed-loop horizontal
B. Open-loop system
C. Hybrid loop system
D. Direct-expansion system
Correct Answer: B
Rationale: Open-loop systems extract groundwater or surface water,
pass it through a heat exchanger, and then return it to the ground or a
surface water body.
8. What is the primary factor in determining whether a horizontal or
vertical loop system should be installed?
A. The color of the building
B. Available land area and soil conditions
C. The age of the building
D. The type of thermostat installed
Correct Answer: B
Rationale: Available land area, soil thermal conductivity, and drilling
feasibility are the primary factors in choosing between horizontal and
vertical loop configurations.
9. What is the purpose of a purge cart during geothermal loop
installation?
A. To add refrigerant to the heat pump
B. To flush air and debris from the ground loop piping
200 PRACTICE QUESTIONS WITH EXPLAINED RATIONALES | LATEST
UPDATE
1. What is the primary function of a geothermal heat pump (GHP)
ground loop?
A. To generate electricity from underground heat
B. To exchange heat between the heat pump and the ground
C. To increase the refrigerant pressure
D. To provide domestic water heating only
Correct Answer: B
Rationale: A geothermal ground loop transfers heat between the heat
pump and the relatively stable temperature of the earth. In heating
mode, it supplies heat to the heat pump; in cooling mode, it rejects
heat into the ground.
2. Which type of geothermal system uses buried piping in horizontal
trenches?
A. Vertical closed-loop system
B. Open-loop system
C. Horizontal closed-loop system
D. Direct-expansion rooftop system
Correct Answer: C
Rationale: Horizontal systems place loops in trenches at relatively
,shallow depths. They generally require more land area than vertical
systems but can be practical where sufficient property is available.
3. What is the principal advantage of a vertical ground-loop system
when compared with a horizontal system?
A. It requires less drilling equipment
B. It uses less land area
C. It is always cheaper to install
D. It does not require antifreeze
Correct Answer: B
Rationale: Vertical loops are installed in deep boreholes, requiring
significantly less surface land area than horizontal systems, making
them ideal for small or constrained lots.
4. Which fluid is most commonly used in closed-loop geothermal
systems?
A. Pure refrigerant
B. Water or a water-glycol mixture
C. Diesel fuel
D. Liquid nitrogen
Correct Answer: B
Rationale: Water or a water-antifreeze mixture (such as propylene
glycol) is circulated through closed-loop systems to transfer heat while
preventing freezing in cold climates.
,5. What is the primary purpose of a heat exchanger in a geothermal
system?
A. To generate electricity
B. To transfer heat between two fluids without mixing them
C. To increase groundwater pressure
D. To store thermal energy permanently
Correct Answer: B
Rationale: A heat exchanger allows thermal energy to be transferred
between the ground loop fluid and the refrigerant circuit without the
two fluids ever coming into direct contact.
6. What is the typical temperature range of shallow ground used for
geothermal heat pump systems?
A. -10°C to 0°C
B. 0°C to 5°C
C. 10°C to 20°C
D. 50°C to 100°C
Correct Answer: C
Rationale: At depths below the frost line, ground temperatures remain
relatively stable year-round, typically between 10°C and 20°C depending
on geographic location.
7. Which type of geothermal system draws water directly from a well
or surface water body?
, A. Closed-loop horizontal
B. Open-loop system
C. Hybrid loop system
D. Direct-expansion system
Correct Answer: B
Rationale: Open-loop systems extract groundwater or surface water,
pass it through a heat exchanger, and then return it to the ground or a
surface water body.
8. What is the primary factor in determining whether a horizontal or
vertical loop system should be installed?
A. The color of the building
B. Available land area and soil conditions
C. The age of the building
D. The type of thermostat installed
Correct Answer: B
Rationale: Available land area, soil thermal conductivity, and drilling
feasibility are the primary factors in choosing between horizontal and
vertical loop configurations.
9. What is the purpose of a purge cart during geothermal loop
installation?
A. To add refrigerant to the heat pump
B. To flush air and debris from the ground loop piping
