CT Heating/Cooling Contractor Exam
Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A|
Instant Download Pdf
1. What is the primary purpose of a furnace heat exchanger?
A. Increase blower speed
B. Remove moisture from indoor air
C. Transfer heat from combustion gases to the air without mixing the
two
D. Increase refrigerant pressure
Answer: C. Transfer heat from combustion gases to the air without
mixing the two
Rationale: The heat exchanger transfers heat produced by combustion
to the circulating air while keeping combustion gases separated from
the occupied-space air. A damaged or cracked heat exchanger can
,allow dangerous combustion products, including carbon monoxide, to
enter the air stream.
2. Which component of a forced-air heating system moves
conditioned air through the ductwork?
A. Expansion valve
B. Blower fan
C. Condenser coil
D. Flame sensor
Answer: B. Blower fan
Rationale: The blower fan circulates heated or cooled air through the
supply ducts and returns air through the return system. Proper blower
operation is essential for maintaining airflow, temperature
distribution, and equipment performance.
3. What is the primary function of a thermostat in a heating and
cooling system?
A. Increase refrigerant pressure
B. Sense space temperature and control equipment operation
C. Filter combustion gases
D. Measure duct velocity
,Answer: B. Sense space temperature and control equipment
operation
Rationale: A thermostat monitors indoor temperature and signals the
heating or cooling equipment to operate when the temperature
moves outside the selected setpoint range.
4. Which refrigerant-side component removes heat from indoor air
during a typical air-conditioning cycle?
A. Indoor evaporator coil
B. Outdoor condenser fan
C. Compressor
D. Receiver
Answer: A. Indoor evaporator coil
Rationale: Refrigerant evaporates inside the indoor evaporator coil at
a low pressure and temperature. As indoor air passes over the coil,
heat is transferred into the refrigerant, cooling the air.
5. What is the primary function of the compressor in a vapor-
compression refrigeration system?
A. Reduce refrigerant temperature without changing pressure
B. Circulate water through the boiler
, C. Raise the pressure and temperature of refrigerant vapor
D. Remove dust from return air
Answer: C. Raise the pressure and temperature of refrigerant vapor
Rationale: The compressor takes low-pressure refrigerant vapor from
the evaporator and compresses it into a high-pressure, high-
temperature vapor before it enters the condenser.
6. Which component rejects heat from the refrigerant to the
outdoor environment?
A. Evaporator
B. Condenser
C. Expansion device
D. Accumulator
Answer: B. Condenser
Rationale: The condenser releases heat from the refrigerant to the
surrounding air or water. During air-conditioning operation, it is
normally located in the outdoor unit.
7. What happens to refrigerant pressure as it passes through a
typical metering or expansion device?
A. It increases substantially
B. It remains exactly constant
Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A|
Instant Download Pdf
1. What is the primary purpose of a furnace heat exchanger?
A. Increase blower speed
B. Remove moisture from indoor air
C. Transfer heat from combustion gases to the air without mixing the
two
D. Increase refrigerant pressure
Answer: C. Transfer heat from combustion gases to the air without
mixing the two
Rationale: The heat exchanger transfers heat produced by combustion
to the circulating air while keeping combustion gases separated from
the occupied-space air. A damaged or cracked heat exchanger can
,allow dangerous combustion products, including carbon monoxide, to
enter the air stream.
2. Which component of a forced-air heating system moves
conditioned air through the ductwork?
A. Expansion valve
B. Blower fan
C. Condenser coil
D. Flame sensor
Answer: B. Blower fan
Rationale: The blower fan circulates heated or cooled air through the
supply ducts and returns air through the return system. Proper blower
operation is essential for maintaining airflow, temperature
distribution, and equipment performance.
3. What is the primary function of a thermostat in a heating and
cooling system?
A. Increase refrigerant pressure
B. Sense space temperature and control equipment operation
C. Filter combustion gases
D. Measure duct velocity
,Answer: B. Sense space temperature and control equipment
operation
Rationale: A thermostat monitors indoor temperature and signals the
heating or cooling equipment to operate when the temperature
moves outside the selected setpoint range.
4. Which refrigerant-side component removes heat from indoor air
during a typical air-conditioning cycle?
A. Indoor evaporator coil
B. Outdoor condenser fan
C. Compressor
D. Receiver
Answer: A. Indoor evaporator coil
Rationale: Refrigerant evaporates inside the indoor evaporator coil at
a low pressure and temperature. As indoor air passes over the coil,
heat is transferred into the refrigerant, cooling the air.
5. What is the primary function of the compressor in a vapor-
compression refrigeration system?
A. Reduce refrigerant temperature without changing pressure
B. Circulate water through the boiler
, C. Raise the pressure and temperature of refrigerant vapor
D. Remove dust from return air
Answer: C. Raise the pressure and temperature of refrigerant vapor
Rationale: The compressor takes low-pressure refrigerant vapor from
the evaporator and compresses it into a high-pressure, high-
temperature vapor before it enters the condenser.
6. Which component rejects heat from the refrigerant to the
outdoor environment?
A. Evaporator
B. Condenser
C. Expansion device
D. Accumulator
Answer: B. Condenser
Rationale: The condenser releases heat from the refrigerant to the
surrounding air or water. During air-conditioning operation, it is
normally located in the outdoor unit.
7. What happens to refrigerant pressure as it passes through a
typical metering or expansion device?
A. It increases substantially
B. It remains exactly constant
