Apprentice HVAC Technician Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. In a residential split-system air conditioner, an apprentice HVAC technician
is asked to identify the primary purpose of the compressor within the
refrigeration cycle. Which of the following best describes the compressor's
function?
A. It removes moisture from indoor air before cooling begins.
B. It compresses low-pressure refrigerant vapor into a high-pressure, high-
temperature vapor for circulation through the system.
C. It converts refrigerant vapor directly into liquid inside the evaporator.
D. It reduces refrigerant pressure before it enters the condenser.
Rationale: The compressor is the heart of the refrigeration system. It draws
low-pressure refrigerant vapor from the evaporator and compresses it into
a high-pressure, high-temperature vapor so that heat can be rejected in
the condenser.
, 2. An HVAC technician notices that warm indoor air is passing over the
evaporator coil. What is the primary purpose of the evaporator coil
during normal cooling operation?
A. It increases refrigerant pressure before it reaches the compressor.
B. It condenses refrigerant into a high-pressure liquid.
C. It stores excess refrigerant during peak demand.
D. It absorbs heat from indoor air as refrigerant evaporates into a vapor.
Rationale: The evaporator coil absorbs heat from the indoor air. As the
refrigerant boils and changes from liquid to vapor, it removes heat from
the air, producing cooler supply air.
3. Which refrigeration component is specifically designed to remove heat
from the refrigerant and condense it from a vapor into a liquid?
A. Expansion valve
B. Evaporator coil
C. Accumulator
D. Condenser coil
Rationale: The condenser rejects heat absorbed indoors and heat added by
compression. As the refrigerant releases heat, it condenses into a high-
pressure liquid.
4. A thermostatic expansion valve (TXV) performs which primary function
in a refrigeration system?
,A. Compresses refrigerant vapor.
B. Filters contaminants from refrigerant.
C. Meters refrigerant flow into the evaporator while reducing its pressure.
D. Stores excess refrigerant during off cycles.
Rationale: A TXV regulates refrigerant flow based on evaporator load
while reducing refrigerant pressure before it enters the evaporator,
allowing efficient heat absorption.
5. Which refrigerant line carries low-pressure refrigerant vapor from the
evaporator back to the compressor?
A. Liquid line
B. Hot gas bypass line
C. Discharge line
D. Suction line
Rationale: The suction line transports cool, low-pressure refrigerant vapor
from the evaporator outlet to the compressor inlet.
6. Before servicing an HVAC electrical circuit, what should an apprentice
technician do first?
A. Remove all wiring immediately.
B. Measure refrigerant pressure.
C. Disconnect electrical power and verify that the circuit is de-energized.
D. Replace the thermostat.
, Rationale: Electrical safety always begins with disconnecting power and
confirming the absence of voltage before performing maintenance or
repairs.
7. What is the primary purpose of grounding electrical equipment in
HVAC installations?
A. Increase equipment efficiency.
B. Reduce refrigerant pressure.
C. Improve thermostat accuracy.
D. Provide a safe path for fault current to reduce the risk of electric shock.
Rationale: Proper grounding protects people and equipment by safely
directing fault current to earth, allowing protective devices to operate.
8. A multimeter is set to measure AC voltage. Which of the following
should the technician do before taking a measurement?
A. Disconnect the meter leads after touching the wires together.
B. Set the meter to resistance mode.
C. Verify the meter is set to the correct voltage range and connect the
probes across the energized circuit.
D. Connect both probes to the same conductor.
Rationale: Selecting the proper function and range ensures accurate
voltage measurement and helps prevent damage to the meter or injury to
the technician.
Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. In a residential split-system air conditioner, an apprentice HVAC technician
is asked to identify the primary purpose of the compressor within the
refrigeration cycle. Which of the following best describes the compressor's
function?
A. It removes moisture from indoor air before cooling begins.
B. It compresses low-pressure refrigerant vapor into a high-pressure, high-
temperature vapor for circulation through the system.
C. It converts refrigerant vapor directly into liquid inside the evaporator.
D. It reduces refrigerant pressure before it enters the condenser.
Rationale: The compressor is the heart of the refrigeration system. It draws
low-pressure refrigerant vapor from the evaporator and compresses it into
a high-pressure, high-temperature vapor so that heat can be rejected in
the condenser.
, 2. An HVAC technician notices that warm indoor air is passing over the
evaporator coil. What is the primary purpose of the evaporator coil
during normal cooling operation?
A. It increases refrigerant pressure before it reaches the compressor.
B. It condenses refrigerant into a high-pressure liquid.
C. It stores excess refrigerant during peak demand.
D. It absorbs heat from indoor air as refrigerant evaporates into a vapor.
Rationale: The evaporator coil absorbs heat from the indoor air. As the
refrigerant boils and changes from liquid to vapor, it removes heat from
the air, producing cooler supply air.
3. Which refrigeration component is specifically designed to remove heat
from the refrigerant and condense it from a vapor into a liquid?
A. Expansion valve
B. Evaporator coil
C. Accumulator
D. Condenser coil
Rationale: The condenser rejects heat absorbed indoors and heat added by
compression. As the refrigerant releases heat, it condenses into a high-
pressure liquid.
4. A thermostatic expansion valve (TXV) performs which primary function
in a refrigeration system?
,A. Compresses refrigerant vapor.
B. Filters contaminants from refrigerant.
C. Meters refrigerant flow into the evaporator while reducing its pressure.
D. Stores excess refrigerant during off cycles.
Rationale: A TXV regulates refrigerant flow based on evaporator load
while reducing refrigerant pressure before it enters the evaporator,
allowing efficient heat absorption.
5. Which refrigerant line carries low-pressure refrigerant vapor from the
evaporator back to the compressor?
A. Liquid line
B. Hot gas bypass line
C. Discharge line
D. Suction line
Rationale: The suction line transports cool, low-pressure refrigerant vapor
from the evaporator outlet to the compressor inlet.
6. Before servicing an HVAC electrical circuit, what should an apprentice
technician do first?
A. Remove all wiring immediately.
B. Measure refrigerant pressure.
C. Disconnect electrical power and verify that the circuit is de-energized.
D. Replace the thermostat.
, Rationale: Electrical safety always begins with disconnecting power and
confirming the absence of voltage before performing maintenance or
repairs.
7. What is the primary purpose of grounding electrical equipment in
HVAC installations?
A. Increase equipment efficiency.
B. Reduce refrigerant pressure.
C. Improve thermostat accuracy.
D. Provide a safe path for fault current to reduce the risk of electric shock.
Rationale: Proper grounding protects people and equipment by safely
directing fault current to earth, allowing protective devices to operate.
8. A multimeter is set to measure AC voltage. Which of the following
should the technician do before taking a measurement?
A. Disconnect the meter leads after touching the wires together.
B. Set the meter to resistance mode.
C. Verify the meter is set to the correct voltage range and connect the
probes across the energized circuit.
D. Connect both probes to the same conductor.
Rationale: Selecting the proper function and range ensures accurate
voltage measurement and helps prevent damage to the meter or injury to
the technician.
