AK Thermal Systems Contractor Exam
Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. Which of the following is the primary function of a thermal insulation
system in a building?
A. To reduce noise levels
B. To minimize heat transfer
C. To provide structural support
D. To improve lighting efficiency
Answer: B
Rationale: Thermal insulation systems are designed primarily to
reduce heat loss or gain, improving energy efficiency.
2. What type of thermal system uses fluid to transfer heat from one area to
another?
A. Radiant system
B. Electric heater
C. Hydronic system
D. Forced air system
Answer: C
Rationale: Hydronic systems circulate water or another fluid to
transfer heat efficiently through pipes and radiators.
3. In HVAC, what does the term “BTU” stand for?
A. Building Thermal Unit
B. British Thermal Unit
C. Basic Temperature Utility
D. Boiler Thermal Unit
Answer: B
, Rationale: BTU is a standard measurement of heat energy,
commonly used in heating and cooling systems.
4. Which material is most commonly used for insulating hot water pipes?
A. Fiberglass
B. Foam rubber
C. Polyethylene foam
D. Steel
Answer: C
Rationale: Polyethylene foam is flexible, easy to install, and effective
at reducing heat loss in piping systems.
5. What is the main purpose of a thermal expansion tank in a closed-loop
hydronic system?
A. To filter water
B. To heat water
C. To pump water
D. To absorb pressure fluctuations
Answer: D
Rationale: Thermal expansion tanks prevent excessive pressure
buildup caused by water expanding when heated.
6. Which of the following is a common sign of an underperforming
HVAC system?
A. Strong airflow
B. Even heating
C. Uneven temperature distribution
D. Low energy bills
Answer: C
Rationale: Uneven heating or cooling indicates that the thermal
system is not effectively distributing energy throughout the building.
7. What type of valve is typically used to control water flow in a hydronic
system?
A. Ball valve
B. Zone valve
C. Check valve
D. Gate valve
Answer: B
Rationale: Zone valves allow selective control of water flow to
different parts of the system, optimizing heating.
, 8. Which HVAC component is responsible for removing heat from a
space?
A. Boiler
B. Chiller
C. Radiator
D. Expansion tank
Answer: B
Rationale: Chillers extract heat from air or water and transfer it to
another medium, providing cooling.
9. What is the typical temperature range for domestic hot water in a
residential system?
A. 50–60°F
B. 90–100°F
C. 120–140°F
D. 160–180°F
Answer: C
Rationale: Domestic hot water is usually maintained between 120°F
and 140°F for safety and comfort.
10. In thermal systems, what is the primary purpose of a heat
exchanger?
A. To store energy
B. To pump fluid
C. To transfer heat between two mediums
D. To insulate pipes
Answer: C
Rationale: Heat exchangers allow heat transfer between two fluids
without mixing them, which is essential in hydronic and HVAC
systems.
11. Which type of pump is commonly used in closed-loop hydronic
systems?
A. Centrifugal pump
B. Circulator pump
C. Submersible pump
D. Peristaltic pump
Answer: B
Rationale: Circulator pumps are designed to maintain flow within a
closed-loop heating system efficiently.
Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. Which of the following is the primary function of a thermal insulation
system in a building?
A. To reduce noise levels
B. To minimize heat transfer
C. To provide structural support
D. To improve lighting efficiency
Answer: B
Rationale: Thermal insulation systems are designed primarily to
reduce heat loss or gain, improving energy efficiency.
2. What type of thermal system uses fluid to transfer heat from one area to
another?
A. Radiant system
B. Electric heater
C. Hydronic system
D. Forced air system
Answer: C
Rationale: Hydronic systems circulate water or another fluid to
transfer heat efficiently through pipes and radiators.
3. In HVAC, what does the term “BTU” stand for?
A. Building Thermal Unit
B. British Thermal Unit
C. Basic Temperature Utility
D. Boiler Thermal Unit
Answer: B
, Rationale: BTU is a standard measurement of heat energy,
commonly used in heating and cooling systems.
4. Which material is most commonly used for insulating hot water pipes?
A. Fiberglass
B. Foam rubber
C. Polyethylene foam
D. Steel
Answer: C
Rationale: Polyethylene foam is flexible, easy to install, and effective
at reducing heat loss in piping systems.
5. What is the main purpose of a thermal expansion tank in a closed-loop
hydronic system?
A. To filter water
B. To heat water
C. To pump water
D. To absorb pressure fluctuations
Answer: D
Rationale: Thermal expansion tanks prevent excessive pressure
buildup caused by water expanding when heated.
6. Which of the following is a common sign of an underperforming
HVAC system?
A. Strong airflow
B. Even heating
C. Uneven temperature distribution
D. Low energy bills
Answer: C
Rationale: Uneven heating or cooling indicates that the thermal
system is not effectively distributing energy throughout the building.
7. What type of valve is typically used to control water flow in a hydronic
system?
A. Ball valve
B. Zone valve
C. Check valve
D. Gate valve
Answer: B
Rationale: Zone valves allow selective control of water flow to
different parts of the system, optimizing heating.
, 8. Which HVAC component is responsible for removing heat from a
space?
A. Boiler
B. Chiller
C. Radiator
D. Expansion tank
Answer: B
Rationale: Chillers extract heat from air or water and transfer it to
another medium, providing cooling.
9. What is the typical temperature range for domestic hot water in a
residential system?
A. 50–60°F
B. 90–100°F
C. 120–140°F
D. 160–180°F
Answer: C
Rationale: Domestic hot water is usually maintained between 120°F
and 140°F for safety and comfort.
10. In thermal systems, what is the primary purpose of a heat
exchanger?
A. To store energy
B. To pump fluid
C. To transfer heat between two mediums
D. To insulate pipes
Answer: C
Rationale: Heat exchangers allow heat transfer between two fluids
without mixing them, which is essential in hydronic and HVAC
systems.
11. Which type of pump is commonly used in closed-loop hydronic
systems?
A. Centrifugal pump
B. Circulator pump
C. Submersible pump
D. Peristaltic pump
Answer: B
Rationale: Circulator pumps are designed to maintain flow within a
closed-loop heating system efficiently.
