RETA CIRO REFRIGERATION CYCLE
ANALYSIS PRACTICE EXAM WITH ACTUAL
QUESTIONS AND VERIFIED ANSWERS,
PLUS EXPLAINED RATIONALES/EXPERT
VERIFIED FOR GUARANTEED 100% PASS
2026/LATEST UPDATE/INSTANT
DOWNLOAD PDF
1.
A centrifugal refrigeration system is operating at steady state. The
refrigerant leaves the evaporator as a slightly superheated vapor and
enters the compressor. Which sequence most accurately represents the
ideal vapor-compression refrigeration cycle as refrigerant moves through
the major components?
A. Evaporator → condenser → compressor → expansion device →
evaporator
B. Compressor → evaporator → expansion device → condenser →
compressor
C. Evaporator → compressor → condenser → expansion device →
evaporator
D. Condenser → expansion device → compressor → evaporator →
condenser
Answer: C. Evaporator → compressor → condenser → expansion
device → evaporator
Rationale: In the standard vapor-compression cycle, low-pressure
refrigerant vapor exits the evaporator, enters the compressor, is
compressed to a higher pressure, rejects heat in the condenser, passes
through the expansion device where pressure drops, and then returns
to the evaporator to absorb heat. Understanding this sequence is
1
,fundamental to refrigeration-cycle analysis because each component
produces a characteristic change in pressure, temperature, enthalpy,
and refrigerant state.
2.
An operator is analyzing a refrigeration system and determines that the
refrigerant entering the compressor has 40°F of saturation temperature at
the measured suction pressure, while the actual suction-line temperature
is 52°F. What is the suction superheat?
A. 8°F
B. 12°F
C. 18°F
D. 92°F
Answer: B. 12°F
Rationale: Superheat is calculated as actual vapor temperature minus
the saturation temperature corresponding to the measured pressure.
Therefore, 52°F − 40°F = 12°F of superheat. Proper suction
superheat helps confirm that liquid refrigerant is not entering the
compressor while also providing information about evaporator and
suction-line performance.
3.
A refrigeration system has an evaporator saturation temperature of 20°F
and a conditioned-space temperature of 35°F. Assuming the measured
temperatures are appropriate for comparison, what is the approximate
evaporator temperature difference?
A. 15°F
B. 20°F
2
,C. 35°F
D. 55°F
Answer: A. 15°F
Rationale: The evaporator temperature difference is commonly
evaluated as the temperature difference between the load-space or
entering-air temperature and the evaporating refrigerant saturation
temperature. Here, 35°F − 20°F = 15°F. The resulting temperature
difference can provide useful diagnostic information about evaporator
loading, airflow, coil condition, and refrigerant-side performance.
4.
During cycle analysis, the refrigerant leaving the condenser is found to
be substantially warmer than the saturation temperature corresponding to
its measured condensing pressure. What condition does this most
directly indicate?
A. Excessive subcooling
B. Liquid flashing at the expansion valve outlet
C. Condenser outlet superheat
D. Condenser outlet subcooling
Answer: C. Condenser outlet superheat
Rationale: If the refrigerant leaving a condenser is above its
saturation temperature at the corresponding condensing pressure, the
refrigerant is superheated vapor rather than subcooled liquid. In a
normally operating conventional vapor-compression system, the
desired condenser outlet condition is generally liquid with some degree
of subcooling. Significant vapor remaining at the condenser outlet can
indicate inadequate condensation, excessive heat load, insufficient
condenser capacity, or other operating problems.
3
, 5.
A technician measures a liquid-line temperature of 85°F. The saturation
temperature corresponding to the measured high-side pressure is 95°F.
What is the liquid-line subcooling?
A. 5°F
B. 10°F
C. 15°F
D. 20°F
Answer: B. 10°F
Rationale: Subcooling is calculated as saturation temperature minus
actual liquid temperature. Therefore, 95°F − 85°F = 10°F of
subcooling. Subcooling indicates that the refrigerant has been cooled
below its saturation temperature while remaining in the liquid state.
6.
Which refrigerant property is particularly useful for determining the
energy absorbed or rejected by the refrigerant across major refrigeration-
cycle components?
A. Enthalpy
B. Specific gravity only
C. Molecular color
D. Atmospheric pressure
Answer: A. Enthalpy
Rationale: Enthalpy represents the refrigerant's specific energy
content and is central to refrigeration-cycle calculations. The
evaporator refrigeration effect can be approximated from the
difference between evaporator outlet and inlet enthalpy, while
4
ANALYSIS PRACTICE EXAM WITH ACTUAL
QUESTIONS AND VERIFIED ANSWERS,
PLUS EXPLAINED RATIONALES/EXPERT
VERIFIED FOR GUARANTEED 100% PASS
2026/LATEST UPDATE/INSTANT
DOWNLOAD PDF
1.
A centrifugal refrigeration system is operating at steady state. The
refrigerant leaves the evaporator as a slightly superheated vapor and
enters the compressor. Which sequence most accurately represents the
ideal vapor-compression refrigeration cycle as refrigerant moves through
the major components?
A. Evaporator → condenser → compressor → expansion device →
evaporator
B. Compressor → evaporator → expansion device → condenser →
compressor
C. Evaporator → compressor → condenser → expansion device →
evaporator
D. Condenser → expansion device → compressor → evaporator →
condenser
Answer: C. Evaporator → compressor → condenser → expansion
device → evaporator
Rationale: In the standard vapor-compression cycle, low-pressure
refrigerant vapor exits the evaporator, enters the compressor, is
compressed to a higher pressure, rejects heat in the condenser, passes
through the expansion device where pressure drops, and then returns
to the evaporator to absorb heat. Understanding this sequence is
1
,fundamental to refrigeration-cycle analysis because each component
produces a characteristic change in pressure, temperature, enthalpy,
and refrigerant state.
2.
An operator is analyzing a refrigeration system and determines that the
refrigerant entering the compressor has 40°F of saturation temperature at
the measured suction pressure, while the actual suction-line temperature
is 52°F. What is the suction superheat?
A. 8°F
B. 12°F
C. 18°F
D. 92°F
Answer: B. 12°F
Rationale: Superheat is calculated as actual vapor temperature minus
the saturation temperature corresponding to the measured pressure.
Therefore, 52°F − 40°F = 12°F of superheat. Proper suction
superheat helps confirm that liquid refrigerant is not entering the
compressor while also providing information about evaporator and
suction-line performance.
3.
A refrigeration system has an evaporator saturation temperature of 20°F
and a conditioned-space temperature of 35°F. Assuming the measured
temperatures are appropriate for comparison, what is the approximate
evaporator temperature difference?
A. 15°F
B. 20°F
2
,C. 35°F
D. 55°F
Answer: A. 15°F
Rationale: The evaporator temperature difference is commonly
evaluated as the temperature difference between the load-space or
entering-air temperature and the evaporating refrigerant saturation
temperature. Here, 35°F − 20°F = 15°F. The resulting temperature
difference can provide useful diagnostic information about evaporator
loading, airflow, coil condition, and refrigerant-side performance.
4.
During cycle analysis, the refrigerant leaving the condenser is found to
be substantially warmer than the saturation temperature corresponding to
its measured condensing pressure. What condition does this most
directly indicate?
A. Excessive subcooling
B. Liquid flashing at the expansion valve outlet
C. Condenser outlet superheat
D. Condenser outlet subcooling
Answer: C. Condenser outlet superheat
Rationale: If the refrigerant leaving a condenser is above its
saturation temperature at the corresponding condensing pressure, the
refrigerant is superheated vapor rather than subcooled liquid. In a
normally operating conventional vapor-compression system, the
desired condenser outlet condition is generally liquid with some degree
of subcooling. Significant vapor remaining at the condenser outlet can
indicate inadequate condensation, excessive heat load, insufficient
condenser capacity, or other operating problems.
3
, 5.
A technician measures a liquid-line temperature of 85°F. The saturation
temperature corresponding to the measured high-side pressure is 95°F.
What is the liquid-line subcooling?
A. 5°F
B. 10°F
C. 15°F
D. 20°F
Answer: B. 10°F
Rationale: Subcooling is calculated as saturation temperature minus
actual liquid temperature. Therefore, 95°F − 85°F = 10°F of
subcooling. Subcooling indicates that the refrigerant has been cooled
below its saturation temperature while remaining in the liquid state.
6.
Which refrigerant property is particularly useful for determining the
energy absorbed or rejected by the refrigerant across major refrigeration-
cycle components?
A. Enthalpy
B. Specific gravity only
C. Molecular color
D. Atmospheric pressure
Answer: A. Enthalpy
Rationale: Enthalpy represents the refrigerant's specific energy
content and is central to refrigeration-cycle calculations. The
evaporator refrigeration effect can be approximated from the
difference between evaporator outlet and inlet enthalpy, while
4
