AR GEG Geothermal Contractor Exam
Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A| Instant
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Question 1
What is the primary function of a ground-source geothermal heat pump
system in a residential building?
A. To generate electricity from underground magma
B. To extract groundwater for domestic consumption
C. To transfer heat between a building and the ground for heating and
cooling
D. To convert solar radiation into thermal energy
Rationale: A ground-source heat pump transfers thermal energy
between a building and the relatively stable temperature of the earth.
During heating, it extracts heat from the ground and delivers it
,indoors. During cooling, it removes heat from the building and
transfers it into the ground. Unlike geothermal power plants,
residential ground-source heat pumps do not require volcanic activity
or underground steam.
Question 2
Which property of the earth makes it useful as a heat source and heat
sink for geothermal heat pumps?
A. Its temperature changes dramatically every hour.
B. It produces unlimited electricity at shallow depths.
C. It remains frozen throughout the year.
D. Its temperature below the surface is relatively stable compared
with outdoor air temperatures.
Rationale: Ground temperatures at appropriate loop depths fluctuate
less than outdoor air temperatures. This relatively stable thermal
environment allows ground-source heat pumps to operate without
relying directly on extreme outdoor air conditions. The actual ground
temperature depends on location, depth, soil conditions, groundwater
movement, and seasonal influences.
Question 3
,What does the term COP mean when evaluating a geothermal heat
pump?
A. Coefficient of pressure
B. Capacity of production
C. Coefficient of performance
D. Current operating percentage
Rationale: The coefficient of performance (COP) is the ratio of useful
heating or cooling energy delivered to the energy consumed by the
system. For heating, a COP of 4 means that the system delivers four
units of heat for every unit of electrical energy consumed under the
stated test conditions. COP is dimensionless and varies with operating
conditions.
Question 4
A geothermal heat pump delivers 16 kW of heating while consuming 4
kW of electrical power. What is its heating COP?
A. 2
B. 3
C. 4
D. 8
, Rationale: Heating COP is calculated by dividing the useful heating
output by the electrical input. Therefore, COP = 16 kW ÷ 4 kW = 4. This
means the heat pump delivers four units of heating energy for each
unit of electrical energy consumed, under the specified operating
conditions.
Question 5
Which component transfers heat between the refrigerant circuit and
the ground-loop fluid?
A. Expansion tank
B. Air filter
C. Compressor contactor
D. Refrigerant-to-water heat exchanger
Rationale: A refrigerant-to-water heat exchanger transfers thermal
energy between the refrigerant circuit and the circulating water or
antifreeze solution in the ground loop. Depending on the system
design and operating mode, it allows heat to move between the
refrigerant and the ground-loop fluid. The compressor changes
refrigerant pressure and temperature but does not directly exchange
heat with the ground loop.
Question 6
Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A| Instant
Download Pdf
Question 1
What is the primary function of a ground-source geothermal heat pump
system in a residential building?
A. To generate electricity from underground magma
B. To extract groundwater for domestic consumption
C. To transfer heat between a building and the ground for heating and
cooling
D. To convert solar radiation into thermal energy
Rationale: A ground-source heat pump transfers thermal energy
between a building and the relatively stable temperature of the earth.
During heating, it extracts heat from the ground and delivers it
,indoors. During cooling, it removes heat from the building and
transfers it into the ground. Unlike geothermal power plants,
residential ground-source heat pumps do not require volcanic activity
or underground steam.
Question 2
Which property of the earth makes it useful as a heat source and heat
sink for geothermal heat pumps?
A. Its temperature changes dramatically every hour.
B. It produces unlimited electricity at shallow depths.
C. It remains frozen throughout the year.
D. Its temperature below the surface is relatively stable compared
with outdoor air temperatures.
Rationale: Ground temperatures at appropriate loop depths fluctuate
less than outdoor air temperatures. This relatively stable thermal
environment allows ground-source heat pumps to operate without
relying directly on extreme outdoor air conditions. The actual ground
temperature depends on location, depth, soil conditions, groundwater
movement, and seasonal influences.
Question 3
,What does the term COP mean when evaluating a geothermal heat
pump?
A. Coefficient of pressure
B. Capacity of production
C. Coefficient of performance
D. Current operating percentage
Rationale: The coefficient of performance (COP) is the ratio of useful
heating or cooling energy delivered to the energy consumed by the
system. For heating, a COP of 4 means that the system delivers four
units of heat for every unit of electrical energy consumed under the
stated test conditions. COP is dimensionless and varies with operating
conditions.
Question 4
A geothermal heat pump delivers 16 kW of heating while consuming 4
kW of electrical power. What is its heating COP?
A. 2
B. 3
C. 4
D. 8
, Rationale: Heating COP is calculated by dividing the useful heating
output by the electrical input. Therefore, COP = 16 kW ÷ 4 kW = 4. This
means the heat pump delivers four units of heating energy for each
unit of electrical energy consumed, under the specified operating
conditions.
Question 5
Which component transfers heat between the refrigerant circuit and
the ground-loop fluid?
A. Expansion tank
B. Air filter
C. Compressor contactor
D. Refrigerant-to-water heat exchanger
Rationale: A refrigerant-to-water heat exchanger transfers thermal
energy between the refrigerant circuit and the circulating water or
antifreeze solution in the ground loop. Depending on the system
design and operating mode, it allows heat to move between the
refrigerant and the ground-loop fluid. The compressor changes
refrigerant pressure and temperature but does not directly exchange
heat with the ground loop.
Question 6
