Indiana Hvac Contractor Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of HVAC load calculations?
A. To select duct color
B. To determine system size requirements
C. To calculate refrigerant type
D. To measure airflow noise
B. To determine system size requirements
Rationale: Load calculations determine heating and cooling demands to
properly size HVAC equipment for efficiency and comfort.
2. Which refrigerant is classified as an HFC?
A. R-22
B. R-410A
C. Ammonia
D. R-717
B. R-410A
Rationale: R-410A is a hydrofluorocarbon (HFC) refrigerant with no ozone
depletion potential.
3. What does superheat indicate in a refrigeration system?
A. Liquid refrigerant temperature
B. Vapor temperature above saturation point
C. Compressor discharge pressure
D. Condenser subcooling
,B. Vapor temperature above saturation point
Rationale: Superheat measures how much the refrigerant vapor has been
heated above its boiling point.
4. Which tool is used to measure electrical current in HVAC systems?
A. Voltmeter
B. Ohmmeter
C. Clamp meter
D. Thermometer
C. Clamp meter
Rationale: A clamp meter measures current flow without breaking the
circuit.
5. What is the function of a thermostat in an HVAC system?
A. Increase refrigerant pressure
B. Control temperature by switching equipment on/off
C. Filter air contaminants
D. Measure humidity only
B. Control temperature by switching equipment on/off
Rationale: A thermostat regulates indoor temperature by controlling
system operation.
6. Which gas is commonly used in brazing HVAC copper pipes?
A. Oxygen only
B. Nitrogen only
C. Oxygen-acetylene
D. Argon only
C. Oxygen-acetylene
Rationale: Oxygen-acetylene produces a high-temperature flame suitable
for brazing copper joints.
7. What is the purpose of a TXV (Thermostatic Expansion Valve)?
A. Compress refrigerant
B. Control refrigerant flow into evaporator
, C. Remove moisture from air
D. Increase voltage supply
B. Control refrigerant flow into evaporator
Rationale: The TXV regulates refrigerant entering the evaporator based on
load demand.
8. Which law explains pressure and temperature relationship in sealed
systems?
A. Ohm’s Law
B. Boyle’s Law
C. Dalton’s Law
D. Newton’s Law
B. Boyle’s Law
Rationale: Boyle’s Law states pressure increases as volume decreases at
constant temperature.
9. What is the purpose of a condenser in HVAC systems?
A. Absorb heat from air
B. Reject heat to outdoor environment
C. Filter air
D. Increase humidity
B. Reject heat to outdoor environment
Rationale: The condenser removes heat from refrigerant and releases it
outside.
10. Which component starts the compressor motor?
A. Capacitor
B. Thermostat
C. Evaporator coil
D. Filter dryer
A. Capacitor
Rationale: A capacitor provides the initial electrical boost needed to start
the motor.
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of HVAC load calculations?
A. To select duct color
B. To determine system size requirements
C. To calculate refrigerant type
D. To measure airflow noise
B. To determine system size requirements
Rationale: Load calculations determine heating and cooling demands to
properly size HVAC equipment for efficiency and comfort.
2. Which refrigerant is classified as an HFC?
A. R-22
B. R-410A
C. Ammonia
D. R-717
B. R-410A
Rationale: R-410A is a hydrofluorocarbon (HFC) refrigerant with no ozone
depletion potential.
3. What does superheat indicate in a refrigeration system?
A. Liquid refrigerant temperature
B. Vapor temperature above saturation point
C. Compressor discharge pressure
D. Condenser subcooling
,B. Vapor temperature above saturation point
Rationale: Superheat measures how much the refrigerant vapor has been
heated above its boiling point.
4. Which tool is used to measure electrical current in HVAC systems?
A. Voltmeter
B. Ohmmeter
C. Clamp meter
D. Thermometer
C. Clamp meter
Rationale: A clamp meter measures current flow without breaking the
circuit.
5. What is the function of a thermostat in an HVAC system?
A. Increase refrigerant pressure
B. Control temperature by switching equipment on/off
C. Filter air contaminants
D. Measure humidity only
B. Control temperature by switching equipment on/off
Rationale: A thermostat regulates indoor temperature by controlling
system operation.
6. Which gas is commonly used in brazing HVAC copper pipes?
A. Oxygen only
B. Nitrogen only
C. Oxygen-acetylene
D. Argon only
C. Oxygen-acetylene
Rationale: Oxygen-acetylene produces a high-temperature flame suitable
for brazing copper joints.
7. What is the purpose of a TXV (Thermostatic Expansion Valve)?
A. Compress refrigerant
B. Control refrigerant flow into evaporator
, C. Remove moisture from air
D. Increase voltage supply
B. Control refrigerant flow into evaporator
Rationale: The TXV regulates refrigerant entering the evaporator based on
load demand.
8. Which law explains pressure and temperature relationship in sealed
systems?
A. Ohm’s Law
B. Boyle’s Law
C. Dalton’s Law
D. Newton’s Law
B. Boyle’s Law
Rationale: Boyle’s Law states pressure increases as volume decreases at
constant temperature.
9. What is the purpose of a condenser in HVAC systems?
A. Absorb heat from air
B. Reject heat to outdoor environment
C. Filter air
D. Increase humidity
B. Reject heat to outdoor environment
Rationale: The condenser removes heat from refrigerant and releases it
outside.
10. Which component starts the compressor motor?
A. Capacitor
B. Thermostat
C. Evaporator coil
D. Filter dryer
A. Capacitor
Rationale: A capacitor provides the initial electrical boost needed to start
the motor.
