NATE Heat Pump Specialty Certification
Practice Exam Questions With Correct Answers
(Verified Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. Which component in a heat pump reverses the flow of refrigerant
to switch between heating and cooling modes?
A. Compressor
B. Expansion valve
C. Reversing valve
D. Evaporator coil
The reversing valve is specifically designed to change the direction of
refrigerant flow, allowing the heat pump to provide both heating and
cooling without altering the system configuration.
2. In heating mode, the outdoor coil of a heat pump functions as:
A. Condenser
B. Evaporator
C. Expansion device
D. Suction accumulator
,During heating, the outdoor coil absorbs heat from the outside air and
acts as the evaporator, while the indoor coil releases heat into the
conditioned space.
3. Which type of refrigerant is commonly used in residential heat
pumps today?
A. R-22
B. R-410A
C. R-134a
D. R-407C
R-410A has replaced R-22 in most residential heat pumps due to its
higher efficiency and compliance with environmental regulations.
4. What is the primary purpose of the accumulator in a heat pump
system?
A. Filter the refrigerant
B. Prevent liquid refrigerant from entering the compressor
C. Increase pressure in the suction line
D. Control expansion valve operation
The accumulator protects the compressor by capturing excess liquid
refrigerant in the suction line, preventing damage from liquid
slugging.
, 5. Which control strategy helps prevent the indoor coil from freezing
during heating mode?
A. Defrost timer
B. Reversing valve operation and defrost control
C. Expansion valve modulation
D. Compressor overpressure switch
The defrost control periodically reverses the heat pump or cycles
auxiliary heat to remove frost buildup on the outdoor coil, protecting
system performance.
6. What is the main reason a heat pump’s efficiency drops in
extremely cold temperatures?
A. Low airflow over indoor coil
B. Compressor malfunction
C. Reduced heat absorption from outdoor air
D. Faulty reversing valve
As outdoor air temperatures fall, the heat pump’s ability to extract
heat diminishes, reducing heating efficiency and requiring
supplemental heat.
7. The capacity of a heat pump is typically rated in:
A. Watts
B. PSI
, C. BTU/h
D. Amperes
Heat pumps are rated in BTU/h (British Thermal Units per hour) to
indicate the amount of heat they can move for heating or cooling.
8. Which type of expansion device is commonly used in modern heat
pumps for precise refrigerant control?
A. Fixed orifice
B. Capillary tube
C. Thermostatic expansion valve (TXV)
D. Float valve
TXVs regulate refrigerant flow to maintain proper superheat at the
evaporator, improving efficiency and protecting the compressor.
9. In cooling mode, the indoor coil of a heat pump serves as the:
A. Compressor
B. Reversing valve
C. Evaporator
D. Condenser
When cooling, the indoor coil absorbs heat from the indoor air,
functioning as the evaporator, while the outdoor coil releases heat.
Practice Exam Questions With Correct Answers
(Verified Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. Which component in a heat pump reverses the flow of refrigerant
to switch between heating and cooling modes?
A. Compressor
B. Expansion valve
C. Reversing valve
D. Evaporator coil
The reversing valve is specifically designed to change the direction of
refrigerant flow, allowing the heat pump to provide both heating and
cooling without altering the system configuration.
2. In heating mode, the outdoor coil of a heat pump functions as:
A. Condenser
B. Evaporator
C. Expansion device
D. Suction accumulator
,During heating, the outdoor coil absorbs heat from the outside air and
acts as the evaporator, while the indoor coil releases heat into the
conditioned space.
3. Which type of refrigerant is commonly used in residential heat
pumps today?
A. R-22
B. R-410A
C. R-134a
D. R-407C
R-410A has replaced R-22 in most residential heat pumps due to its
higher efficiency and compliance with environmental regulations.
4. What is the primary purpose of the accumulator in a heat pump
system?
A. Filter the refrigerant
B. Prevent liquid refrigerant from entering the compressor
C. Increase pressure in the suction line
D. Control expansion valve operation
The accumulator protects the compressor by capturing excess liquid
refrigerant in the suction line, preventing damage from liquid
slugging.
, 5. Which control strategy helps prevent the indoor coil from freezing
during heating mode?
A. Defrost timer
B. Reversing valve operation and defrost control
C. Expansion valve modulation
D. Compressor overpressure switch
The defrost control periodically reverses the heat pump or cycles
auxiliary heat to remove frost buildup on the outdoor coil, protecting
system performance.
6. What is the main reason a heat pump’s efficiency drops in
extremely cold temperatures?
A. Low airflow over indoor coil
B. Compressor malfunction
C. Reduced heat absorption from outdoor air
D. Faulty reversing valve
As outdoor air temperatures fall, the heat pump’s ability to extract
heat diminishes, reducing heating efficiency and requiring
supplemental heat.
7. The capacity of a heat pump is typically rated in:
A. Watts
B. PSI
, C. BTU/h
D. Amperes
Heat pumps are rated in BTU/h (British Thermal Units per hour) to
indicate the amount of heat they can move for heating or cooling.
8. Which type of expansion device is commonly used in modern heat
pumps for precise refrigerant control?
A. Fixed orifice
B. Capillary tube
C. Thermostatic expansion valve (TXV)
D. Float valve
TXVs regulate refrigerant flow to maintain proper superheat at the
evaporator, improving efficiency and protecting the compressor.
9. In cooling mode, the indoor coil of a heat pump serves as the:
A. Compressor
B. Reversing valve
C. Evaporator
D. Condenser
When cooling, the indoor coil absorbs heat from the indoor air,
functioning as the evaporator, while the outdoor coil releases heat.
