Virginia HVAC License/Exam Review (Master
Journeyman) Exam
Question 1. Which component in a refrigeration cycle is responsible for
compressing low-pressure vapor into high-pressure vapor?
A) Condenser
B) Evaporator
C) Compressor
D) Expansion valve
Answer: C
Explanation: The compressor is responsible for compressing low-pressure vapor
from the evaporator into high-pressure vapor, enabling the refrigerant to release
heat in the condenser.
Question 2. In refrigeration, superheat refers to the temperature of refrigerant
vapor:
A) Below saturation temperature at a given pressure
B) Above saturation temperature at a given pressure
C) Equal to the saturation temperature
D) At the dew point
Answer: B
Explanation: Superheat is the additional heat added to the refrigerant vapor
beyond its saturation temperature at a specific pressure, ensuring all liquid is
vaporized before reaching the compressor.
, Virginia HVAC License/Exam Review (Master
Journeyman) Exam
Question 3. Which refrigerant property is primarily affected by the pressure-
temperature relationship in a refrigeration system?
A) Specific heat
B) Latent heat
C) Saturation temperature
D) Viscosity
Answer: C
Explanation: The pressure-temperature relationship defines the saturation
temperature of a refrigerant at a given pressure, which is critical for system
operation and proper charge.
Question 4. Which of the following is a common environmental concern
associated with traditional refrigerants?
A) Ozone depletion potential (ODP)
B) High thermal conductivity
C) Low heat of vaporization
D) Non-flammability
Answer: A
, Virginia HVAC License/Exam Review (Master
Journeyman) Exam
Explanation: Many traditional refrigerants, such as CFCs and HCFCs, have high
ozone depletion potential, leading to environmental concerns and regulations
phasing them out.
Question 5. The psychrometric chart is used to determine which of the following
properties?
A) Refrigerant pressure and temperature
B) Air humidity, enthalpy, and dry-bulb temperature
C) Electrical resistance and current
D) Fuel combustion efficiency
Answer: B
Explanation: The psychrometric chart graphically represents air properties such as
humidity, enthalpy, dry-bulb, and wet-bulb temperatures, essential for HVAC load
calculations and humidity control.
Question 6. Which heat transfer method involves the transfer of heat through
direct contact between materials?
A) Conduction
B) Convection
C) Radiation
D) Evaporation
, Virginia HVAC License/Exam Review (Master
Journeyman) Exam
Answer: A
Explanation: Conduction involves heat transfer through direct contact between
molecules in solids, essential in heat exchange processes within HVAC systems.
Question 7. Which type of heating system uses a fluid (water or glycol) circulated
through pipes to distribute heat?
A) Forced air furnace
B) Hydronic system
C) Radiant panel system
D) Heat pump
Answer: B
Explanation: Hydronic systems utilize water or glycol circulated via pipes to
transfer heat to radiators or underfloor heating elements.
Question 8. What is the primary fuel source for a natural gas furnace?
A) Propane
B) Electricity
C) Natural gas
D) Fuel oil
Answer: C
Journeyman) Exam
Question 1. Which component in a refrigeration cycle is responsible for
compressing low-pressure vapor into high-pressure vapor?
A) Condenser
B) Evaporator
C) Compressor
D) Expansion valve
Answer: C
Explanation: The compressor is responsible for compressing low-pressure vapor
from the evaporator into high-pressure vapor, enabling the refrigerant to release
heat in the condenser.
Question 2. In refrigeration, superheat refers to the temperature of refrigerant
vapor:
A) Below saturation temperature at a given pressure
B) Above saturation temperature at a given pressure
C) Equal to the saturation temperature
D) At the dew point
Answer: B
Explanation: Superheat is the additional heat added to the refrigerant vapor
beyond its saturation temperature at a specific pressure, ensuring all liquid is
vaporized before reaching the compressor.
, Virginia HVAC License/Exam Review (Master
Journeyman) Exam
Question 3. Which refrigerant property is primarily affected by the pressure-
temperature relationship in a refrigeration system?
A) Specific heat
B) Latent heat
C) Saturation temperature
D) Viscosity
Answer: C
Explanation: The pressure-temperature relationship defines the saturation
temperature of a refrigerant at a given pressure, which is critical for system
operation and proper charge.
Question 4. Which of the following is a common environmental concern
associated with traditional refrigerants?
A) Ozone depletion potential (ODP)
B) High thermal conductivity
C) Low heat of vaporization
D) Non-flammability
Answer: A
, Virginia HVAC License/Exam Review (Master
Journeyman) Exam
Explanation: Many traditional refrigerants, such as CFCs and HCFCs, have high
ozone depletion potential, leading to environmental concerns and regulations
phasing them out.
Question 5. The psychrometric chart is used to determine which of the following
properties?
A) Refrigerant pressure and temperature
B) Air humidity, enthalpy, and dry-bulb temperature
C) Electrical resistance and current
D) Fuel combustion efficiency
Answer: B
Explanation: The psychrometric chart graphically represents air properties such as
humidity, enthalpy, dry-bulb, and wet-bulb temperatures, essential for HVAC load
calculations and humidity control.
Question 6. Which heat transfer method involves the transfer of heat through
direct contact between materials?
A) Conduction
B) Convection
C) Radiation
D) Evaporation
, Virginia HVAC License/Exam Review (Master
Journeyman) Exam
Answer: A
Explanation: Conduction involves heat transfer through direct contact between
molecules in solids, essential in heat exchange processes within HVAC systems.
Question 7. Which type of heating system uses a fluid (water or glycol) circulated
through pipes to distribute heat?
A) Forced air furnace
B) Hydronic system
C) Radiant panel system
D) Heat pump
Answer: B
Explanation: Hydronic systems utilize water or glycol circulated via pipes to
transfer heat to radiators or underfloor heating elements.
Question 8. What is the primary fuel source for a natural gas furnace?
A) Propane
B) Electricity
C) Natural gas
D) Fuel oil
Answer: C
