ALABAMA HEATING AND AIR CONDITIONING
CONTRACTOR EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) Q&A
2027|INSTANT DOWNLOAD PDF
1. What is the primary purpose of an HVAC system?
A. To produce electricity
B. To control indoor temperature and comfort
C. To increase water pressure
D. To eliminate all outdoor air
Answer: B. To control indoor temperature and comfort
Rationale: HVAC systems are designed primarily to provide
heating, cooling, ventilation, and comfort control within
occupied spaces.
2. Which component transfers heat from indoor air to
refrigerant during cooling?
A. Condenser
B. Compressor
C. Evaporator coil
D. Receiver
Answer: C. Evaporator coil
,Rationale: The evaporator absorbs heat from indoor air as
refrigerant evaporates inside the coil.
3. What is the primary function of the compressor in a vapor-
compression refrigeration system?
A. Reduce refrigerant pressure
B. Increase refrigerant pressure and circulate refrigerant
C. Remove moisture from air
D. Meter refrigerant into the evaporator
Answer: B. Increase refrigerant pressure and circulate
refrigerant
Rationale: The compressor raises the pressure and
temperature of refrigerant vapor and drives refrigerant through
the system.
4. Which component rejects heat to the outdoor
environment?
A. Evaporator
B. Condenser
C. Expansion device
D. Filter-drier
Answer: B. Condenser
Rationale: The condenser releases heat absorbed from the
building plus compressor heat to the outdoor surroundings.
,5. What is the function of a thermostatic expansion valve
(TXV)?
A. Compress refrigerant
B. Condense refrigerant
C. Meter refrigerant into the evaporator
D. Remove oil from refrigerant
Answer: C. Meter refrigerant into the evaporator
Rationale: A TXV regulates refrigerant flow into the evaporator
based primarily on superheat.
6. What does superheat represent?
A. Temperature below saturation
B. Temperature of liquid refrigerant
C. Temperature of vapor above its saturation temperature
D. Condenser pressure
Answer: C. Temperature of vapor above its saturation
temperature
Rationale: Superheat is the difference between actual vapor
temperature and the saturation temperature at the measured
pressure.
7. What does subcooling indicate?
, A. Liquid temperature below its saturation temperature
B. Vapor temperature above saturation
C. Compressor discharge temperature
D. Indoor air temperature
Answer: A. Liquid temperature below its saturation
temperature
Rationale: Subcooling is the difference between saturation
temperature and actual liquid refrigerant temperature.
8. What is the purpose of a filter-drier?
A. Increase airflow
B. Remove moisture and contaminants from the refrigerant
system
C. Increase compressor speed
D. Reduce blower noise
Answer: B. Remove moisture and contaminants from the
refrigerant system
Rationale: Filter-driers help protect refrigeration components
from moisture, acid, dirt, and other contaminants.
9. Which refrigerant-side condition can cause compressor
damage?
A. Proper superheat
B. Liquid refrigerant entering the compressor
CONTRACTOR EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) Q&A
2027|INSTANT DOWNLOAD PDF
1. What is the primary purpose of an HVAC system?
A. To produce electricity
B. To control indoor temperature and comfort
C. To increase water pressure
D. To eliminate all outdoor air
Answer: B. To control indoor temperature and comfort
Rationale: HVAC systems are designed primarily to provide
heating, cooling, ventilation, and comfort control within
occupied spaces.
2. Which component transfers heat from indoor air to
refrigerant during cooling?
A. Condenser
B. Compressor
C. Evaporator coil
D. Receiver
Answer: C. Evaporator coil
,Rationale: The evaporator absorbs heat from indoor air as
refrigerant evaporates inside the coil.
3. What is the primary function of the compressor in a vapor-
compression refrigeration system?
A. Reduce refrigerant pressure
B. Increase refrigerant pressure and circulate refrigerant
C. Remove moisture from air
D. Meter refrigerant into the evaporator
Answer: B. Increase refrigerant pressure and circulate
refrigerant
Rationale: The compressor raises the pressure and
temperature of refrigerant vapor and drives refrigerant through
the system.
4. Which component rejects heat to the outdoor
environment?
A. Evaporator
B. Condenser
C. Expansion device
D. Filter-drier
Answer: B. Condenser
Rationale: The condenser releases heat absorbed from the
building plus compressor heat to the outdoor surroundings.
,5. What is the function of a thermostatic expansion valve
(TXV)?
A. Compress refrigerant
B. Condense refrigerant
C. Meter refrigerant into the evaporator
D. Remove oil from refrigerant
Answer: C. Meter refrigerant into the evaporator
Rationale: A TXV regulates refrigerant flow into the evaporator
based primarily on superheat.
6. What does superheat represent?
A. Temperature below saturation
B. Temperature of liquid refrigerant
C. Temperature of vapor above its saturation temperature
D. Condenser pressure
Answer: C. Temperature of vapor above its saturation
temperature
Rationale: Superheat is the difference between actual vapor
temperature and the saturation temperature at the measured
pressure.
7. What does subcooling indicate?
, A. Liquid temperature below its saturation temperature
B. Vapor temperature above saturation
C. Compressor discharge temperature
D. Indoor air temperature
Answer: A. Liquid temperature below its saturation
temperature
Rationale: Subcooling is the difference between saturation
temperature and actual liquid refrigerant temperature.
8. What is the purpose of a filter-drier?
A. Increase airflow
B. Remove moisture and contaminants from the refrigerant
system
C. Increase compressor speed
D. Reduce blower noise
Answer: B. Remove moisture and contaminants from the
refrigerant system
Rationale: Filter-driers help protect refrigeration components
from moisture, acid, dirt, and other contaminants.
9. Which refrigerant-side condition can cause compressor
damage?
A. Proper superheat
B. Liquid refrigerant entering the compressor
