TENNESSEE HVAC CONTRACTOR EXAM – QUESTIONS AND ANSWERS | VERIFIED
AND WELL DETAILED ANSWERS | PLUS RATIONALES | GUARANTEED PASS | LATEST
EXAM UPDATE
Core Domains
Load Calculations and Psychrometrics
Refrigeration Theory
Heating Systems and Combustion Air
Duct Design and Air Balance
Ventilation and Exhaust Systems
Controls and Electrical Theory
Piping and Fuel Gas
Safety and OSHA Compliance
Introduction
The purpose of this comprehensive assessment is to evaluate the competency of HVAC
contractors in
accordance with regulatory standards. This exam assesses fundamental mechanical
theory, complex
load calculations, and the safe installation of heating, cooling, and ventilation
,systems. Through
multiple-choice and scenario-based questions, candidates must demonstrate a
deep understanding of
fuel gas codes, electrical troubleshooting, and psychrometric principles. Emphasis is
placed on
real-world application, ensuring that contractors can make critical decisions
regarding efficiency,
safety compliance, and system longevity. This exam is designed to reflect the
technical rigor and
professional standards required for licensure in the field.
Section One: Questions 1–100
1. According to the International Mechanical Code, what is the minimum clearance for
an outdoor air intake from a plumbing vent?
A. 3 feet
B. 5 feet
🟢 C. 10 feet
D. 15 feet
,🔴 Explanation: To prevent the re-entrainment of sewer gases into the building's
ventilation system, outdoor air intakes must be located at least 10 feet from any
plumbing vent.
2. Which of the following instruments is used to measure the moisture content in the
air by comparing dry-bulb and wet-bulb temperatures?
A. Manometer
🟢 B. Sling Psychrometer
C. Anemometer
D. Hydrometer
🔴 Explanation: A sling psychrometer consists of two thermometers (dry and wet bulb)
and is used to determine relative humidity and other psychrometric properties through
evaporation.
3. In a refrigeration cycle, the process where a gas is converted into a liquid by
releasing heat is known as:
🟢 A. Condensation
B. Evaporation
C. Sublimation
D. Compression
, 🔴 Explanation: Condensation occurs in the condenser coil where the high-pressure
refrigerant vapor sheds heat to the surrounding medium and changes state to a liquid.
4. A technician is installing a natural gas furnace. What is the standard approximate
heating value of natural gas per cubic foot?
A. 500 BTUs
B. 2,500 BTUs
🟢 C. 1,000 BTUs
D. 10,000 BTUs
🔴 Explanation: Natural gas typically provides approximately 1,000 to 1,050 BTUs per
cubic foot, whereas propane provides approximately 2,500 BTUs.
5. What is the maximum distance a manual shutoff valve can be located from a gas
appliance, provided it is in the same room?
A. 3 feet
🟢 B. 6 feet
C. 10 feet
D. 12 feet
AND WELL DETAILED ANSWERS | PLUS RATIONALES | GUARANTEED PASS | LATEST
EXAM UPDATE
Core Domains
Load Calculations and Psychrometrics
Refrigeration Theory
Heating Systems and Combustion Air
Duct Design and Air Balance
Ventilation and Exhaust Systems
Controls and Electrical Theory
Piping and Fuel Gas
Safety and OSHA Compliance
Introduction
The purpose of this comprehensive assessment is to evaluate the competency of HVAC
contractors in
accordance with regulatory standards. This exam assesses fundamental mechanical
theory, complex
load calculations, and the safe installation of heating, cooling, and ventilation
,systems. Through
multiple-choice and scenario-based questions, candidates must demonstrate a
deep understanding of
fuel gas codes, electrical troubleshooting, and psychrometric principles. Emphasis is
placed on
real-world application, ensuring that contractors can make critical decisions
regarding efficiency,
safety compliance, and system longevity. This exam is designed to reflect the
technical rigor and
professional standards required for licensure in the field.
Section One: Questions 1–100
1. According to the International Mechanical Code, what is the minimum clearance for
an outdoor air intake from a plumbing vent?
A. 3 feet
B. 5 feet
🟢 C. 10 feet
D. 15 feet
,🔴 Explanation: To prevent the re-entrainment of sewer gases into the building's
ventilation system, outdoor air intakes must be located at least 10 feet from any
plumbing vent.
2. Which of the following instruments is used to measure the moisture content in the
air by comparing dry-bulb and wet-bulb temperatures?
A. Manometer
🟢 B. Sling Psychrometer
C. Anemometer
D. Hydrometer
🔴 Explanation: A sling psychrometer consists of two thermometers (dry and wet bulb)
and is used to determine relative humidity and other psychrometric properties through
evaporation.
3. In a refrigeration cycle, the process where a gas is converted into a liquid by
releasing heat is known as:
🟢 A. Condensation
B. Evaporation
C. Sublimation
D. Compression
, 🔴 Explanation: Condensation occurs in the condenser coil where the high-pressure
refrigerant vapor sheds heat to the surrounding medium and changes state to a liquid.
4. A technician is installing a natural gas furnace. What is the standard approximate
heating value of natural gas per cubic foot?
A. 500 BTUs
B. 2,500 BTUs
🟢 C. 1,000 BTUs
D. 10,000 BTUs
🔴 Explanation: Natural gas typically provides approximately 1,000 to 1,050 BTUs per
cubic foot, whereas propane provides approximately 2,500 BTUs.
5. What is the maximum distance a manual shutoff valve can be located from a gas
appliance, provided it is in the same room?
A. 3 feet
🟢 B. 6 feet
C. 10 feet
D. 12 feet
