HVAC Journeyman ACTUAL EXAM 2025 COMPLETE QUESTIONS WITH DETAILED
ANSWERS || VERIFIED & UPDATED || 100% GUARANTEED PASS
Description: Complete HVAC Journeyman Exam prep with all updated and verified
questions for 2025. Includes detailed answers covering system design, installation,
troubleshooting, and electrical principles. Expert-approved content ensures
mastery and guaranteed success on the journeyman certification exam.
Keywords: HVAC journeyman exam HVAC certification system installation HVAC
troubleshooting air conditioning systems heating systems electrical principles
HVAC HVAC test prep journeyman practice test refrigeration systems
HVAC Journeyman Exam 2025: 100 Practice Questions & Verified Answers
Section 1: Electrical Principles & Components (Questions 1-25)
1. What is the primary purpose of a transformer in a low-voltage HVAC control
circuit?
A. To increase amperage
B. To step down line voltage (e.g., 120V/240V) to a safer control voltage (e.g., 24V)
C. To convert AC to DC
D. To provide a power factor correction
2. A capacitor with a rating of 35+5 μF is typically used in a PSC motor. The "35"
represents the:
A. Start capacitor value
B. Run capacitor value for the fan motor
C. Run capacitor value for the compressor motor
D. Common terminal capacitance
,3. What is the function of a potential relay?
A. To open the circuit on a rise in voltage, typically used to drop the start capacitor
out of the circuit
B. To open the circuit on a rise in amperage, protecting from overcurrent
C. To close the circuit when it senses a drop in pressure
D. To provide a time delay for the compressor
4. If a compressor has an open internal overload, what should a technician
expect to measure with an ohmmeter across the common and run terminals?
A. Zero ohms
B. Infinite resistance (OL)
C. A very low resistance
D. A resistance that slowly drops
5. The "L1" and "L2" terminals on a contactor are connected to:
A. The 24V control coil
B. The load (e.g., compressor and fan motors)
C. The incoming line voltage from the disconnect
D. The thermostat signals
6. A motor's Locked Rotor Amperage (LRA) is:
A. The same as its Full Load Amperage (FLA)
B. The current drawn when the motor is running at full speed and load
C. The current drawn when the rotor is not turning
D. The current drawn when the motor is unloaded
7. What device is used to protect a motor from sustained overcurrent
conditions?
A. Capacitor
B. Contactor
C. Thermal overload
D. Transformer
8. In a standard heat pump thermostat, what terminal is energized for the
reversing valve in cooling mode on most systems?
, A. O
B. B
C. Y
D. G
9. A low-pressure switch is primarily a safety device that:
A. Proves flame in a furnace
B. Shuts the system off on low refrigerant pressure, often due to a loss of charge
C. Controls the head pressure on a water-cooled system
D. Measures the superheat
10. What is the purpose of a crankcase heater?
A. To prevent refrigerant migration and oil foaming during the off cycle
B. To warm the compressor for faster starting
C. To cool the compressor windings
D. To heat the supply air
11. If you measure 0 ohms across a closed switch, it indicates:
A. The switch is open as designed
B. The switch is closed and functioning properly
C. The switch has infinite resistance
D. The switch is faulty and must be replaced
12. The "C" terminal on a thermostat provides:
A. The call for heat
B. The common side of the 24V power supply
C. The call for cooling
D. Control for the fan
13. A megohmmeter (megger) is used to test:
A. Voltage drop under load
B. Insulation resistance of motor windings
C. Microfarad rating of a capacitor
D. Gas pressure in a line
ANSWERS || VERIFIED & UPDATED || 100% GUARANTEED PASS
Description: Complete HVAC Journeyman Exam prep with all updated and verified
questions for 2025. Includes detailed answers covering system design, installation,
troubleshooting, and electrical principles. Expert-approved content ensures
mastery and guaranteed success on the journeyman certification exam.
Keywords: HVAC journeyman exam HVAC certification system installation HVAC
troubleshooting air conditioning systems heating systems electrical principles
HVAC HVAC test prep journeyman practice test refrigeration systems
HVAC Journeyman Exam 2025: 100 Practice Questions & Verified Answers
Section 1: Electrical Principles & Components (Questions 1-25)
1. What is the primary purpose of a transformer in a low-voltage HVAC control
circuit?
A. To increase amperage
B. To step down line voltage (e.g., 120V/240V) to a safer control voltage (e.g., 24V)
C. To convert AC to DC
D. To provide a power factor correction
2. A capacitor with a rating of 35+5 μF is typically used in a PSC motor. The "35"
represents the:
A. Start capacitor value
B. Run capacitor value for the fan motor
C. Run capacitor value for the compressor motor
D. Common terminal capacitance
,3. What is the function of a potential relay?
A. To open the circuit on a rise in voltage, typically used to drop the start capacitor
out of the circuit
B. To open the circuit on a rise in amperage, protecting from overcurrent
C. To close the circuit when it senses a drop in pressure
D. To provide a time delay for the compressor
4. If a compressor has an open internal overload, what should a technician
expect to measure with an ohmmeter across the common and run terminals?
A. Zero ohms
B. Infinite resistance (OL)
C. A very low resistance
D. A resistance that slowly drops
5. The "L1" and "L2" terminals on a contactor are connected to:
A. The 24V control coil
B. The load (e.g., compressor and fan motors)
C. The incoming line voltage from the disconnect
D. The thermostat signals
6. A motor's Locked Rotor Amperage (LRA) is:
A. The same as its Full Load Amperage (FLA)
B. The current drawn when the motor is running at full speed and load
C. The current drawn when the rotor is not turning
D. The current drawn when the motor is unloaded
7. What device is used to protect a motor from sustained overcurrent
conditions?
A. Capacitor
B. Contactor
C. Thermal overload
D. Transformer
8. In a standard heat pump thermostat, what terminal is energized for the
reversing valve in cooling mode on most systems?
, A. O
B. B
C. Y
D. G
9. A low-pressure switch is primarily a safety device that:
A. Proves flame in a furnace
B. Shuts the system off on low refrigerant pressure, often due to a loss of charge
C. Controls the head pressure on a water-cooled system
D. Measures the superheat
10. What is the purpose of a crankcase heater?
A. To prevent refrigerant migration and oil foaming during the off cycle
B. To warm the compressor for faster starting
C. To cool the compressor windings
D. To heat the supply air
11. If you measure 0 ohms across a closed switch, it indicates:
A. The switch is open as designed
B. The switch is closed and functioning properly
C. The switch has infinite resistance
D. The switch is faulty and must be replaced
12. The "C" terminal on a thermostat provides:
A. The call for heat
B. The common side of the 24V power supply
C. The call for cooling
D. Control for the fan
13. A megohmmeter (megger) is used to test:
A. Voltage drop under load
B. Insulation resistance of motor windings
C. Microfarad rating of a capacitor
D. Gas pressure in a line
