Journeyman Refrigeration Technician
Exam Practice Questions And Correct
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1. A refrigeration technician is troubleshooting a system that exhibits low
suction pressure, high superheat, and reduced cooling capacity. Which
condition is most likely causing this symptom set?
A. Overcharged system with liquid floodback
B. Restricted refrigerant flow due to a partially blocked metering device
C. Excessively high evaporator load
D. Oversized condenser fan motor operation
Answer: B
A restriction at the metering device reduces refrigerant flow into the
evaporator, causing starvation, elevated superheat, and low suction
pressure while reducing overall system capacity.
, 2. In a vapor-compression refrigeration cycle, what is the primary
function of the condenser?
A. To increase refrigerant pressure by mechanical compression
B. To absorb heat from the conditioned space
C. To reject heat from the refrigerant to a cooler medium
D. To meter refrigerant into the evaporator coil
Answer: C
The condenser removes heat absorbed in the evaporator and heat of
compression, allowing the refrigerant to condense from a high-pressure
vapor into a high-pressure liquid.
3. Which refrigerant characteristic is most desirable for efficient heat
transfer in HVAC systems?
A. High boiling point at atmospheric pressure
B. Low latent heat of vaporization
C. High latent heat of vaporization
D. High flammability rating
Answer: C
A high latent heat of vaporization allows the refrigerant to absorb large
amounts of heat during phase change, improving system efficiency.
4. What is the purpose of superheat measurement at the evaporator
outlet?
,A. To determine condenser subcooling levels
B. To verify complete evaporation of liquid refrigerant
C. To measure compressor discharge temperature
D. To calculate system electrical consumption
Answer: B
Superheat ensures that all liquid refrigerant has vaporized before entering
the compressor, protecting it from liquid slugging damage.
5. A system shows high head pressure during normal ambient conditions.
Which issue is most likely?
A. Undercharged refrigerant system
B. Dirty or blocked condenser coil
C. Excessively large evaporator coil
D. Low indoor heat load
Answer: B
A dirty condenser restricts heat rejection, causing increased condensing
pressure and elevated head pressure.
6. Which component controls refrigerant flow based on evaporator load?
A. Accumulator
B. Thermostatic expansion valve
C. Receiver
D. Suction line filter-drier
, Answer: B
A thermostatic expansion valve modulates refrigerant flow to maintain
proper superheat based on evaporator demand.
7. What is the effect of low refrigerant charge in a system?
A. High head pressure and low superheat
B. Low suction pressure and high superheat
C. High suction pressure and low compressor amperage
D. Normal pressures with increased cooling capacity
Answer: B
Low refrigerant charge leads to insufficient evaporator feed, causing low
suction pressure and increased superheat due to evaporator starvation.
8. Which safety device prevents compressor operation under
dangerously low refrigerant pressure?
A. High-pressure switch
B. Oil separator
C. Low-pressure control
D. Liquid line solenoid valve
Answer: C
A low-pressure control stops compressor operation when suction pressure
drops below safe operating limits, preventing damage.
9. What is the primary purpose of subcooling in a refrigeration system?
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
1. A refrigeration technician is troubleshooting a system that exhibits low
suction pressure, high superheat, and reduced cooling capacity. Which
condition is most likely causing this symptom set?
A. Overcharged system with liquid floodback
B. Restricted refrigerant flow due to a partially blocked metering device
C. Excessively high evaporator load
D. Oversized condenser fan motor operation
Answer: B
A restriction at the metering device reduces refrigerant flow into the
evaporator, causing starvation, elevated superheat, and low suction
pressure while reducing overall system capacity.
, 2. In a vapor-compression refrigeration cycle, what is the primary
function of the condenser?
A. To increase refrigerant pressure by mechanical compression
B. To absorb heat from the conditioned space
C. To reject heat from the refrigerant to a cooler medium
D. To meter refrigerant into the evaporator coil
Answer: C
The condenser removes heat absorbed in the evaporator and heat of
compression, allowing the refrigerant to condense from a high-pressure
vapor into a high-pressure liquid.
3. Which refrigerant characteristic is most desirable for efficient heat
transfer in HVAC systems?
A. High boiling point at atmospheric pressure
B. Low latent heat of vaporization
C. High latent heat of vaporization
D. High flammability rating
Answer: C
A high latent heat of vaporization allows the refrigerant to absorb large
amounts of heat during phase change, improving system efficiency.
4. What is the purpose of superheat measurement at the evaporator
outlet?
,A. To determine condenser subcooling levels
B. To verify complete evaporation of liquid refrigerant
C. To measure compressor discharge temperature
D. To calculate system electrical consumption
Answer: B
Superheat ensures that all liquid refrigerant has vaporized before entering
the compressor, protecting it from liquid slugging damage.
5. A system shows high head pressure during normal ambient conditions.
Which issue is most likely?
A. Undercharged refrigerant system
B. Dirty or blocked condenser coil
C. Excessively large evaporator coil
D. Low indoor heat load
Answer: B
A dirty condenser restricts heat rejection, causing increased condensing
pressure and elevated head pressure.
6. Which component controls refrigerant flow based on evaporator load?
A. Accumulator
B. Thermostatic expansion valve
C. Receiver
D. Suction line filter-drier
, Answer: B
A thermostatic expansion valve modulates refrigerant flow to maintain
proper superheat based on evaporator demand.
7. What is the effect of low refrigerant charge in a system?
A. High head pressure and low superheat
B. Low suction pressure and high superheat
C. High suction pressure and low compressor amperage
D. Normal pressures with increased cooling capacity
Answer: B
Low refrigerant charge leads to insufficient evaporator feed, causing low
suction pressure and increased superheat due to evaporator starvation.
8. Which safety device prevents compressor operation under
dangerously low refrigerant pressure?
A. High-pressure switch
B. Oil separator
C. Low-pressure control
D. Liquid line solenoid valve
Answer: C
A low-pressure control stops compressor operation when suction pressure
drops below safe operating limits, preventing damage.
9. What is the primary purpose of subcooling in a refrigeration system?
