Florida Commercial Refrigeration Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. A technician is troubleshooting a medium-temperature commercial
refrigeration system serving a grocery store meat display case. The
evaporator pressure is lower than normal, the compressor amperage
is low, and the sight glass shows bubbles continuously. The condenser
is clean and condenser airflow is normal. Which condition is the most
likely cause of these operating symptoms?
A. Overcharged refrigerant system
B. Restricted liquid line filter-drier
C. Defective evaporator fan motor
D. Flooded condenser coil
B. Restricted liquid line filter-drier
,A restricted liquid line filter-drier causes refrigerant starvation at the
evaporator, resulting in low suction pressure, low compressor amperage,
and flashing refrigerant visible in the sight glass. The condenser operating
normally helps eliminate airflow-related condenser problems.
2. In a commercial walk-in freezer operating with R-404A refrigerant, a
technician measures a suction pressure corresponding to an
evaporating temperature of -20°F and a suction line temperature of
0°F at the evaporator outlet. What is the system superheat?
A. 10°F
B. 15°F
C. 20°F
D. 25°F
C. 20°F
Superheat is calculated by subtracting the evaporator saturation
temperature from the actual suction line temperature. In this case, 0°F
minus -20°F equals 20°F superheat.
3. A supermarket rack refrigeration system experiences excessive frost
accumulation on the evaporator coil even though the defrost timer
appears operational. Which condition is the most likely cause?
,A. Low condenser pressure
B. Defective evaporator pressure regulator
C. Failed defrost heater element
D. High compressor oil level
C. Failed defrost heater element
If the timer initiates defrost but frost continues to accumulate, the most
probable issue is failure of the defrost heater to melt accumulated ice from
the evaporator coil.
4. Which refrigeration component is specifically designed to prevent
liquid refrigerant from entering the compressor through the suction
line during low-load conditions?
A. Receiver
B. Accumulator
C. Oil separator
D. Thermostatic expansion valve
B. Accumulator
A suction accumulator stores excess liquid refrigerant and allows only
vapor to return to the compressor, protecting the compressor against
liquid slugging.
, 5. A technician observes abnormally high head pressure on an air-cooled
commercial refrigeration system during normal ambient conditions.
Which condition would most likely cause this symptom?
A. Underfeeding expansion valve
B. Low refrigerant charge
C. Dirty condenser coil
D. Low evaporator load
C. Dirty condenser coil
A dirty condenser coil restricts heat transfer, causing elevated condensing
temperatures and high head pressure. This condition forces the compressor
to work harder and reduces efficiency.
6. In a low-temperature commercial refrigeration application, what is the
primary purpose of a crankcase pressure regulator?
A. To regulate evaporator superheat
B. To limit compressor suction pressure during startup
C. To increase condenser pressure
D. To maintain liquid line subcooling
B. To limit compressor suction pressure during startup
Practice Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. A technician is troubleshooting a medium-temperature commercial
refrigeration system serving a grocery store meat display case. The
evaporator pressure is lower than normal, the compressor amperage
is low, and the sight glass shows bubbles continuously. The condenser
is clean and condenser airflow is normal. Which condition is the most
likely cause of these operating symptoms?
A. Overcharged refrigerant system
B. Restricted liquid line filter-drier
C. Defective evaporator fan motor
D. Flooded condenser coil
B. Restricted liquid line filter-drier
,A restricted liquid line filter-drier causes refrigerant starvation at the
evaporator, resulting in low suction pressure, low compressor amperage,
and flashing refrigerant visible in the sight glass. The condenser operating
normally helps eliminate airflow-related condenser problems.
2. In a commercial walk-in freezer operating with R-404A refrigerant, a
technician measures a suction pressure corresponding to an
evaporating temperature of -20°F and a suction line temperature of
0°F at the evaporator outlet. What is the system superheat?
A. 10°F
B. 15°F
C. 20°F
D. 25°F
C. 20°F
Superheat is calculated by subtracting the evaporator saturation
temperature from the actual suction line temperature. In this case, 0°F
minus -20°F equals 20°F superheat.
3. A supermarket rack refrigeration system experiences excessive frost
accumulation on the evaporator coil even though the defrost timer
appears operational. Which condition is the most likely cause?
,A. Low condenser pressure
B. Defective evaporator pressure regulator
C. Failed defrost heater element
D. High compressor oil level
C. Failed defrost heater element
If the timer initiates defrost but frost continues to accumulate, the most
probable issue is failure of the defrost heater to melt accumulated ice from
the evaporator coil.
4. Which refrigeration component is specifically designed to prevent
liquid refrigerant from entering the compressor through the suction
line during low-load conditions?
A. Receiver
B. Accumulator
C. Oil separator
D. Thermostatic expansion valve
B. Accumulator
A suction accumulator stores excess liquid refrigerant and allows only
vapor to return to the compressor, protecting the compressor against
liquid slugging.
, 5. A technician observes abnormally high head pressure on an air-cooled
commercial refrigeration system during normal ambient conditions.
Which condition would most likely cause this symptom?
A. Underfeeding expansion valve
B. Low refrigerant charge
C. Dirty condenser coil
D. Low evaporator load
C. Dirty condenser coil
A dirty condenser coil restricts heat transfer, causing elevated condensing
temperatures and high head pressure. This condition forces the compressor
to work harder and reduces efficiency.
6. In a low-temperature commercial refrigeration application, what is the
primary purpose of a crankcase pressure regulator?
A. To regulate evaporator superheat
B. To limit compressor suction pressure during startup
C. To increase condenser pressure
D. To maintain liquid line subcooling
B. To limit compressor suction pressure during startup
